association symposia [ IACS ]

C01 – Glacier Monitoring from In-Situ and Remotely Sensed Observations

 

Convener: Michael Zemp (Switzerland)

Co-Conveners: Bruce Raup (USA), Brian Menounos (Canada)

 

Description

Long-term glacier monitoring programmes are key to process understanding and model validation/calibration while comprehensive change assessments from remotely sensed observation allow to assess glacier reactions to climate change over entire mountain ranges. For this symposium, we invite contributions dealing with the observation of glaciers from tropical to polar regions including:

  • the compilation of large-scale (multi-temporal) inventories of glacier area and related hypsometry,
  • long-term in-situ measurements of glacier energy and mass balances,
  • air and space borne sensing of glacier changes in length, area, volume, and mass,
  • and related uncertainty assessments.

C02 – Remote Sensing of the Cryosphere - Into an Era of High-Repeat Rate Time Series

 

Convener: Liss M. Andreassen (Norway)

Co-Conveners: Andreas Kääb (Norway), Leigh A. Stearns (USA)

 

Description

The number of aerial and satellite remote sensing platforms and sensors have grown significantly in recent years. New satellite sensors such as Sentinel and Planet as well as the increasing use of unmanned aerial vehicles open possibilities of using dense time series for exploring the cryosphere. In this symposium, topics include but are not limited to:

  • Cryosphere studies that use time-series from single sensors or by integrations of sensors;
  • Methodology that relies on cloud-based platforms (e.g. Google Earth Engine, Amazon Web Services);
  • Classification schemes (for terminus position and outline mapping, iceberg detection, snow cover, sea ice extent) that rely on machine learning algorithms;
  • Integrating remote sensing and field-based observations to combine spatial and temporal investigations.

C03 – Advances in Glacier and Ice Cap Modelling

 

Convener: Daniel Farinotti (Switzerland)

Co-Conveners: Mathieu Morlighem (USA), Harry Zekollari (Switzerland)

 

Description

Mountain glaciers and ice caps are important freshwater resources for many regions, contribute significantly to present-day sea level rise, and can be a significant source of hazard. Models are needed to project future glacier changes and associated impacts and also to help understanding past changes. This symposium focuses on all aspects of modelling mountain glaciers other than the ice sheets, including but not limited to, the following topics:

  • Coupling of glacier mass balance models with ice flow models;
  • Integration of physical processes, such as subglacial drainage or glacier calving, in existing models;
  • Inverse modelling of subsurface characteristics;
  • Inference of glacier ice thickness from surface measurements.

Studies on all spatial and temporal scales, including future projections are solicited with particular emphasis on a regional-scale studies and high-mountain environments.

C04 – Progress in Quantifying Ice-Sheet Surface Mass Balance: Past, Present and Future

 

Convener: Cécile Agosta (France)

Co-Conveners: Miren Vizcaino (Netherlands), Yetang Wang (China)

 

Description

We focus on the surface mass balance (SMB) of ice-sheets, including individual mass balance components, feedbacks and associated uncertainties, and advancing process understanding from models (regional and global) and/or observations (ground-based and remote). Topics include but are not limited to

  • Quantification of ice-sheet SMB and its uncertainties for the recent past (1850-present) including melt, runoff, sublimation, refreezing, and snow accumulation.
  • Advances in the understanding of key processes relevant for surface mass fluxes, including for example, surface and firn hydrology, drifting snow, and the effect of impurities on melt
  • Quantification of feedbacks between ice sheet SMB and components of the climate system at decadal to centennial time scales, including mass balance – elevation feedbacks, linkages to sea surface conditions, and impacts of storm tracks and large-scale circulation patterns.
  • Projections of ice sheet SMB for the next decades to the next century and associated uncertainties, from regional and global climate models.

C05 – Fast Glacier Flow: Processes, Observations and Modelling of Ice Streams, Tidewater Glaciers and Surging Glaciers

 

Convener: Christine S. Hvidberg (Denmark)

Co-Conveners: Ralf Greve (Japan), Christina Hulbe (New Zealand), Martin Truffer (USA)

 

Description

Fast flowing ice streams and glaciers are important in maintaining the overall mass balance of the Greenland and Antarctic ice sheets, yet the conditions that facilitate and regulate their fast flow remain poorly understood. The mechanics that govern fast flow and surging appear to be very responsive to changing conditions in the subglacial environment and at the front with effects on the whole glacier system. This symposium welcomes contributions from studies of ice streams, tidewater glaciers and surging glaciers, including the subglacial hydrology, shear margin processes, grounding line dynamics, the buttressing role of ice shelves and floating tongues, calving, the influence of surface meltwater and lake drainage, and other ice deformation and mechanical studies related to fast flow. Process studies, observations and/or numerical modelling investigations are all welcome.

C06 – New Frontiers in Paleoclimate Reconstructions and Proxy Interpretations from Ice Cores

 

Convener: Barbara Stenni (Italy)

Co-Conveners: Anais Orsi (France), Nancy A. N. Bertler (New Zealand), T.J. Fudge (USA)

 

Description

This symposium welcomes contributions of state-of-the-art ice core science from both polar regions as well as mid and low latitude glaciers. We invite contributions on, but not limited to, the following topics:

  • results from new drilling campaigns
  • new analytical and drilling techniques
  • advances in ice-core proxy interpretations
  • paleoclimate reconstructions which may integrate other natural archives and / or develop array reconstructions
  • climate model simulations, including isotope enabled models
  • ice/bedrock investigations from ice core and fast access drilling projects

We encourage contributions on different temporal scales spanning the past decades to glacial-interglacial cycles.

C07 – The Hydrological Cycle at High Latitudes: Variability, Changes and Impacts on the Cryosphere

 

Convener: Amaelle Landais (France)

Co-Conveners: Irina Gorodetskaya (Portugal), Takashi Yamanouchi (Japan)

 

Description

The atmospheric water cycle is a key player in the ice sheet surface mass and energy balance. The rapid changes associated with the anthropogenic warming are expected to alter this balance, with changing in poleward moisture transport affecting the precipitation rate, cloud properties, albedo, and consequently mass and energy balance.

In this symposium, we welcome contributions both from modeling and from observational campaigns using a combination of remote sensing, ground/ship-based and satellite observations targeting various aspects of the hydrological cycle in the polar regions and improving their representation in climate models.

Topics can include but are not limited to:

  • Atmospheric dynamics, including the role of atmospheric rivers in the total precipitation budget in the Arctic and Antarctic
  • Water isotope measurements in the vapor, as a new constraint on moisture transport in models.
  • New observation techniques to improve precipitation estimate and the surface mass balance
  • Impacts on the surface energy balance, including clouds, albedo and melt
  • Interaction with the ocean, from air-sea fluxes to the role of precipitation in the ocean salinity changes.

C08 – Tropical Glaciers: Mass Changes, Climate Forcing and Impacts

 

Convener: Jean Emmanuel Sicart (France)

Co-Conveners: Nicolas Cullen (New Zealand), Marcos Villacis (Ecuador)

 

Description

The importance of tropical glaciers for ecosystems, agriculture, freshwater and energy production is widely recognized but detecting their response to changes in the climate system remains challenging. This symposium will focus on the latest efforts and techniques to assess these changes and responses, using observations, atmospheric and glaciological modelling and remote sensing, Topics may include but are not limited to:

  • glacier energy and mass balance and their linkages to large-scale climate variability and change
  • assessment of the changes in the area and hypsometry of tropical glaciers using historical archives and/or integrating field-based observations with remote sensing
  • reconstruction of tropical climate from ice cores and other natural archives
  •  the effects of mass changes on hazards and water resources and related natural and socio-economic systems in the recent past, present and future.

We welcome contributions on all spatial and temporal scales.

C09 – Debris Covered Glaciers

 

Convener: Francesca Pellicciotti (UK)

Co-Conveners: Duncan Quincey (UK), Patrick Wagnon (France)

 

Description

Debris-covered glaciers, mantled in a layer of continuous or discontinuous debris over all or part of their tongues, are common in many mountain ranges of the world.  Debris alters the surface energy and mass balance of glaciers and thus the way these glaciers react to climate. The past decade has seen a dramatic advance in our understanding of their surface processes, mass balance, hydrology, dynamics and long-term evolution. However, many open questions remain. Also modelling debris-covered glaciers remains challenging. This symposium aims to bring together new research results from a variety of different approaches, including numerical modelling, observations and remote sensing, to understand debris-covered glaciers, their processes and main controls. In particular, we invite contributions that include, but are not limited to: i) the formation, characteristics and movement of supraglacial debris; ii) studies of debris-covered glacier energy balance and mass balance, with special emphasis on surface processes such as the formation of supraglacial ponds and cliffs; iii) their hydrology, including englacial and subglacial characteristics; iv) debris-covered glaciers dynamics; v) remote-sensing observations and numerical modelling of debris-covered glaciers and prediction of their changes in response to climate; vi) long term evolution of debris-covered glaciers, reconstructions of former glaciers and their climatic interpretations; vii) the development of hazards associated with debris-covered glaciers such as glacier lake outburst floods or debris flows.

C10 – Challenges in Measuring and Modeling Snow Mechanics

 

Convener: Johan Gaume (Switzerland)

Co-Conveners: Maurine Montagnat (France), Adrian McCallum (Australia), Alec van Herwijnen (Switzerland), Henning Löwe (Switzerland)

 

Description

Measuring and modeling snow is particularly challenging due to its extremely porous, fragile and versatile nature. In particular, the impact of snow metamorphism, ice-grain growth and external loading on snow mechanical properties is still not fully understood. Recently, novel non-intrusive methods have been developed to characterize the mechanics of materials, such as microstructural models based on X-ray computed tomography data or seismic experimental methods. We invite contributions in modelling, experimental and instrumental developments that advance our understanding of snow and ice mechanics. Topics include, but are not limited to ice-grain growth, snow metamorphism, firn densification microstructure-based modelling, snow fabric and anisotropy, constitutive modelling, seismic and acoustic methods, snowpack stability, avalanches, penetrometer, and multiscale numerical methods.

C11 – Towards the Development of a World Snow Centre of Excellence?

 

Convener: Charles Fierz (Switzerland)

Co-Conveners: Ross Brown (Canada), Masahiro Hori (Japan), TBC: Olga N. Bulygina, M. Villacis

 

Description

Characteristics of the snow cover like depth, water equivalent, extent, stratigraphy, etc. as well as depth of snowfall are routine measurements from a range of in situ and remotely sensed methods with widely varying time and spatial scales. These data are used in a broad range of applications including real-time weather and hydrological forecasting, evaluation of snow process models, ecological studies, and climate monitoring. There are a number of challenges using these data: (1) measurement procedures (best practices) are neither consistently applied nor harmonized; (2) data curation is rudimentary in particular with respect to in situ long term snow observations, and (3) the error characteristics of all kinds of snow cover products are often not specified. Tackling these problems requires a focused effort to mobilize the scientific community and operational services. There is currently significant interest in establishing a World Snow Centre of Excellence as an independent, internationally recognized leader both in snow science and operational snow monitoring to develop observing standards, to improve seasonal forecasting products, to validate new snow products, and to compare new generation snow-cover models. We thus invite contributions on, but not limited to the following topics to assist in the thinking of the need for, and the roles and activities of a World Snow Centre of Excellence:

  • In situ snow cover monitoring networks and activities
  • Global snow cover products and validation activities
  • Evaluation of snow-cover models
  • Analysis of snow cover variability and change

C12 – Observations and Modeling of Impacts to Snow and Glaciers Due to Deposition of Light-Absorbing Particles

 

Convener: S. McKenzie Skiles (USA)

Co-Conveners: Outi Meinander (Finland), Marie Dumont (France), Biagio Dimauro (Italy)

 

Description

Light absorbing particles, like deposited dust and black carbon aerosols, impact snow and ice in alpine and polar regions through snow surface darkening. The decline in surface reflectivity enhances albedo feedbacks of seasonal snow and glacier response to changes in air temperature, snow amount, and duration.

This symposium will focus on processes, observations and numerical modelling of the past, present, and future impacts of light absorbing particles (such as dust, black carbon, organic carbon, volcanic ash, biological constituents etc.) on snow and ice including but not limited to seasonal variability, long term trends, transport and deposition, albedo changes and radiative forcing, snowmelt rates and timing, and impacts on glacier mass balance and snow cover evolution.

 

C13 – Advances in the Application of Terrestrial Cosmogenic Nuclides on Glacial Landscapes

 

Convener: Alice Doughty (USA)

Co-Conveners: Henriette Linge (Norway)

 

Description

Cosmogenic dating has enabled us to quantify the detailed evolution of past glacier change in many locations.  The precision and accuracy of these and future data depend on the quality of the method.  This symposium addresses the advancement and application of in-situ terrestrial cosmogenic nuclides (TCN) on landforms in glacial environments for assessing past variations in glaciers and ice sheets. We encourage contributions that present the challenges of TCN on different temporal scales. We invite contributions on, but not limited to, the following topics:

  • new methodological approaches on age and rate determination
  • glacial erosion rates on long and short timescales
  • advances in dating precision of depositional landforms
  • inverse modelling of cosmogenic nuclide measurements
  • palaeoclimate reconstructions based on glacier fluctuations

C14 – Cryospheric Processes and Related Socioeconomic Services

 

Convener: Cunde Xiao (China)

Co-Conveners: Wouter Buytaert (UK), Christian Huggel (Switzerland)

 

Description

Significant human populations live within or adjacent to polar and alpine regions. The cryosphere provides water resources that support irrigation, hydropower generation, and other economic benefits such as tourism. This symposium focuses on all aspects of ‘cryospheric services,’ defined as a variety of services or benefits that humanity gains from cryospheric systems. We seek submissions including but not limited to, the following topics:

  • Services that are provisioned, regulated, or supported by the cryosphere.
  • Cryospheric processes that influence the above services.
  • Changes in the cryopsphere including tipping points or thresholds that may result in putting services at risk.
  • Methods or assessments of the social and/or economic value of cryospheric services.

C15 – 125 Years of the Commission Internationale des Glaciers  - Aspects of the History of Cryospheric Sciences

 

Convener: Samuel Nussbaumer (Switzerland)

Co-Conveners: Dania Achermann (Denmark), Ian Allison (Australia)

 

Description

The cryospheric sciences have matured and grown in prominence over the last century or more. Today, many different associations represent our discipline. Where did they come from, and how did this history help shape our present and future?

 

On the anniversary of the International Glacier Commission, we invite contributions on, but not limited to, the following topics:

  • General history of glaciology and cryospheric sciences including historical development of glaciological concepts and theories
  • Achievements and impacts of historic glaciological expeditions and/or research programme
  • Pioneering early glaciological work revisited today, including the use of this material for modern applications (e.g. for glacier reconstructions)
  • Insights from the development of institutional histories: what can we learn for future research?

Other cryosphere related symposia led by other associations

  • H17 – Advances in Snow Hydrology

     

    Convener: Timothy Link (USA)

    Co-Conveners: Melody Sandells (UK), Danny Marks (USA), Tobias Jonas (Switzerland), Alexander Gelfan (Russia)

     

    Description

    The storage and release of water from seasonal snowcovers constitutes a critical component of the annual hydrological cycle in many parts of the world. Quantifying, understanding, and predicting the processes that control snow distribution and ablation dynamics provide ample research challenges, especially in complex mountainous terrain. The spatial distribution of snowcover and its physical properties is typically highly variable at the meter to the regional scale. Its dynamics are influenced by surrounding topography and vegetation that control accumulation and redistribution processes, as well as local micrometerological conditions that control snowcover energetics and ablation. Accurate modelling of snowcover dynamics requires methods to simulate a large range of physical processes that act and interact at a range of spatial and temporal scales. Advances in these areas are needed and relevant to develop improved tools for water managers concerned with floods, droughts, water supply, and/or hydropower generation.

     

    This symposium will bring together experimental and modeling experts to address recent research in snow hydrology. We especially encourage contributions related to topics such as:

    • Novel measurement approaches for snowpack states and fluxes
    • Feedbacks between climatic and snow hydrological processes and patterns
    • Snow-vegetation interactions in complex terrain
    • Effects of climate variability and change, especially in the rain-snow transition zone
    • Impact of landcover changes on snow hydrology
    • Advances in modeling, including operational applications
    • Representing small scale variability in large scale modeling applications

     

    > Visit the IAHS symposia for more details.

     

  • H18 – Advances in Remote Observation Of Seasonal Snow

    Convener: Tobias Jonas (Switzerland)

    Co-Conveners: Jeff Deems (USA), Jessica Lundquist (USA), Danny Marks (USA), Maria-Jose Polo (Spain)

     

    Description

    Seasonal snow represents an important freshwater resource and critically sets conditions for ecosystem functioning in cold regions around the world. Today’s remote sensing technologies not only enable the measurement of snow distribution across the landscape, but also the simultaneous characterization of terrain and vegetation canopy structure. These combined datasets have reached a level of detail that ultimately allows the study of snowcover dynamics and ecosystem feedbacks to understand the interactions of patterns and processes at exceptionally small scales. This symposium will bring together those working on data from remote sensing technologies such as laser scanners, radar, as well as RGB, thermal, and hyperspectral imagery with the aim of quantifying snow water resources, studying snowcover dynamics, and investigating interactions with atmospheric and ecohydrological processes.

     

    > Visit the IAHS symposia for more details.

     

JOINT SYMPOSIA WITH OTHER ASSOCIATIONS LED BY IACS

  • JC01 – Projecting Sea Level in the 21st Century and Beyond (IACS, IAMAS, IAPSO)

    Convener: Andy Aschwanden (USA, IACS)

    Co-Conveners: Ben Marzeion (Germany, IAMAS), Gary T. Mitchum (USA, IAPSO)

     

    Description

    The seas are currently rising, and the rise is expected to continue into the 21 century and beyond, challenging societies around the globe. The primary contemporary contributors to global mean sea level are thermal expansion due to warming oceans and melting glaciers and ice sheets. Spatially-varying changes in absolute and relative sea level arise from the associated changes in solid Earth loading and variability of the Earth's gravity field. This joint symposium brings together the fields of glaciology, oceanography, atmospheric sciences, hydrology, and solid earth geophysics to assess the relative importance of each component and their respective uncertainties over the next centuries with focus on both regional and global sea level changes.

  • JC02 – Atmosphere-Ocean-Sea Ice Interactions: Local Processes and Global Implications (IACS, IAMAS, IAPSO)

    Convener: John Cassano (USA, IAMAS)

    Co-Conveners: Hiroyuki Enomoto (Japan, IACS), Elisa Manzini (Germany, IAMAS), Matthew Lazzara (USA, IAMAS), James Renwick (New Zealand, IAMAS), Thomas Spengler (Norway, IAMAS), William Perrie (Canada, IAPSO)

     

    Description

    Changes in the Arctic and Antarctic climate system are strongly related to atmosphere-ocean-ice (AOI) interactions. Phenomena such as the dramatic decrease in sea ice extent in the Arctic over the past 30 years contribute to rapid regional warming through feedbacks between the atmosphere, ocean, and sea ice. On the other hand, Antarctic sea ice variability is internally dominated with no strong multi-decadal trend. Understanding and modelling these variations in the coupled AOI system remains a challenge at both poles. AOI interactions are also associated with synoptic weather systems and mesoscale extreme weather phenomena such as cold air outbreaks, katabatic winds, and polar lows. In the Arctic, for example, sea ice loss is associated with rapid regional warming which is often tightly linked to mid-latitude weather and climate. Arctic sea ice loss may also impact the state of the stratospheric vortex, which in turn can affect the large-scale hemispheric circulation in the troposphere. Furthermore, in the Antarctic, sea ice change may affect ice shelf behaviour and hence could affect sea level change. The representation of these physical processes and interactions at different spatial and temporal scales, however, remains a major challenge for current weather and climate models.

    This symposium brings together researchers working in the areas of polar meteorology and oceanography as well as sea ice to focus on physical processes as well as on global change related to the Arctic and Antarctic. Special emphasis is on the coupling between the ocean, ice, and atmosphere and the interactions between the Polar Regions and the large-scale hemispheric and global circulation. Further focus is on processes and parameterizations related to physical exchange, including the influence of sea ice floe-size distribution and sub-mesoscale ocean/sea ice dynamics and thermodynamics. Contributions are welcome dealing with theoretical and observational studies, including remote sensing, as well as studies using numerical models.

     

  • JC03 – Mountain Cryosphere Hazards (IACS, IAVCEI)

    Convener: Marten Geertsema (Canada, IACS)

    Co-Conveners: John J. Clague, (Canada, IACS), Michael Krautblatter (Germany, IACS), Lucia Capra (Mexico, IAVCEI),

     

    Description

    High mountains are currently experiencing some of the largest changes in climate on the planet. Climate warming is driving changes in geomorphic processes operating in mountains, with attendant large impacts on landscapes and ecosystems. This symposium features presentations on the hazards faced by people living and recreating in high mountains, notably avalanches, landslides, debris flows, earthquakes, outburst floods from glacier- and moraine-dammed lakes, volcano-ice interactions, permafrost thaw, and cascading processes. We welcome case studies and contributions featuring state-of-the art tools useful for assessing mountain hazards, including satellite and ground-based InSAR, LiDAR, unmanned aerial vehicles, and modelling using state-of-the art numerical codes.

     

  • JC04 – Declining Glaciers and Snow Cover and Their Impacts on Downstream Hydrology (IACS, IAHS)

    Convener: Regine Hock (USA, IACS)

    Co-Conveners: Danny Marks (USA, IAHS), Alexander Gelfan (Russia, IAHS)

     

    Description

    As glaciers and snow cover decline, significant changes in the hydrological regime and biogeochemical properties of streams are expected in catchments with glacier or snow cover. This symposium focuses on new insights into relevant processes, new observational evidence of ongoing changes, as well as advances in our ability to model future runoff in ice and snow-covered basins on all scales from the local to the global scale. Topics include but are not limited to (a) the impacts of glacier and snow cover changes on runoff amounts and seasonality, physical and biogeochemical properties of stream water, and hydrological pathways, (b) trends in river runoff in glacier and snow affected catchment and their causes, and (c) snow-glacier-climate-runoff feedbacks and related physical processes, including the effects of black carbon/aerosols and changing atmospheric drivers on glacier and snow melt runoff.

     

  • JC05 – Climate Change Impacts on Arctic Snow, Permafrost, Lake and River Ice (IACS, IAHS)

    Convener: Chris Derksen (Canada, IACS)

    Co-Conveners: Homa Kheyrollahpour (Canada, IACS), Alexandrew Langlois (Canada, IACS), Richard Kelly (Canada, IACS), Claude Dugauy (Canada, IACS), Andrei Kalugin (Russia, IAHS)

     

    Description

    The terrestrial cryosphere in the Arctic is undergoing rapid change, evident in shorter snow cover and lake ice duration, changing ice regimes and discharge in northern flowing rivers, warming ground temperatures, decreasing ground ice content, and increasing active layer thickness. These changes have inter-connected impacts on, and feedbacks with, energy and freshwater budgets, vegetation dynamics, the carbon cycle, and aquatic and terrestrial ecosystems. Determining the inter-connected nature of changes to the terrestrial cryosphere, and the ability of climate models to simulate future change pathways will improve understanding of the impacts of climate change on the Arctic.

     

  • JC06 – Is the West Antarctic Ice Sheet Collapsing? - Atmosphere, Ice, and Ocean Interactions Leading to Accelerated Ice Loss (IACS, IAMAS)

    Convener: Ted Scambos (USA, IACS), Christina Hulbe (New Zealand, IACS)

    Co-Conveners: Jan Lenearts (USA, IAMAS)

     

    Description

    The sea level rise potential of West Antarctica is more than 3m, and under some scenarios a rapid increase in ice loss could start before the end of this century. Interactions between atmosphere, ocean, and the ice front have initiated early and dramatic changes to several glacier and ice shelf areas, notably Thwaites Glacier, Pine Island Glacier, and the Getz Ice Shelf. We welcome topics discussing all aspects of this issue, including —

    • Ice flow and surface accumulation changes in the past few decades;
    • Studies of atmospheric circulation trends, ocean circulation, and relationship to ice loss;
    • Analyses of the geophysical setting of the ice: its bed, its margins, or the state of the ice itself;
    • Studies of key processes driving ice mass changes, ice front stability, or the ice-ocean interface;
    • Records of the decadal, century, and millennial-scale history of the ice sheet and ocean;
    • Models of the system that explain past changes or forecast future mass balance of the WAIS.

     

  • JC07 – Gravity-Driven Flows in the Earth System (IACS, IAPSO, IAVCEI)

    Convener: Jim N. McElwaine (UK, IACS)

    Co-Conveners: Dieter Issler (Norway, IACS), Federico Falcini (Italy, IAPSO), Roberto Sulpizio (Italy, IAVCEI)

     

    Description

    Gravity-driven flows ― subaqueous and subaerial, terrestrial and extra-terrestrial ― occur in a variety of types that nevertheless share many features. There is large potential for improving our understanding of these fascinating and practically important phenomena by comparing experimental data and mathematical modelling approaches across traditional subdiscipline boundaries.

    This interdisciplinary symposium therefore aims to summarize our current understanding of, and identify future research challenges in, gravity-driven flows.

     

    Contributions are welcomed on the following topics, among others:

    • Novel field observations and measurements
    • New experimental techniques
    • General modelling frameworks for gravity-driven flows at different scales and level of detail
    • Mathematical models of specific processes (e.g., flow-regime changes,
    • erosion, entrainment and deposition, particle–fluid interaction, turbulence)
    • Hazard assessment and mitigation methods

     

  • JC08 – Coupling Processes Between the Atmospheric Boundary-Layer and Snow/Ice Surfaces: Observations and Modelling (IACS, IAHS, IAMAS)

    Convener: Vincent Vionnet (Canada, IACS)

    Co-Conveners: Ruzica Dadic (New Zealand, IACS), John Pomeroy (Canada, IAHS), Tobias Jonas (Switzerland, IAHS), Rebecca Mott (Switzerland, IAMAS), Ethan Gutmann (USA, IAMAS)

     

    Description

    The symposium addresses fundamental exchange mechanisms of mass and energy between the cryosphere, vegetation and the atmospheric boundary layer in snow-covered regions. The interaction between the near-surface atmosphere and the cryosphere can lead to significant spatial and temporal variations of momentum, mass- and energy exchange as well as complex atmospheric flow patterns that are modulated by complexities in topography and vegetation cover. These processes strongly affect the evolution of seasonal snow cover, permafrost, sea ice, vegetation and glaciers and drive snow and ice hydrology.

    We invite contributions on, but not limited to, the following topics:

    • treatment of turbulent fluxes over snow in models and measurements
    • advection of energy to snow-covers and glaciers and impact on snow and ice melt
    • orographically-induced precipitation and preferential deposition of snowfall
    • wind-induced snow transport and associated sublimation
    • impact of vegetation on snow/atmosphere interactions
    • Studies in level and mountainous terrain are welcome. We particularly encourage abstracts that propose advances in a) modelling techniques to represent the physics of coupling the atmospheric boundary layer to snow and ice surfaces and b) observational techniques to explore these complex coupling processes.

     

OTHER IACS JOINT SYMPOSIA WITH OTHER ASSOCIATIONS LEADING

  • JS01 - CRYOSEISMOLOGY (IASPEI, IACS, IAG)

    Convener: Masaki Kanao (Japan, IASPEI)

    Co-Conveners: Douglas Wiens (USA, IASPEI), Timothy C. Bartholomaus (USA, IACS), Mirko Scheinert (Germany, IAG)

     

    Description

    In high latitude and elevation regions, the Earth’s glaciers, ice sheets, sea ice, permafrost, and snowpacks are undergoing rapid change. However, our understanding of the processes governing these changes are hindered by a lack of observations with sufficient temporal and spatial resolution, in these generally remote landscapes.  Fortunately, many of the cryospheric processes of interest produce ground vibrations.  Analysis of these seismic signals can yield insight into the relationship between environmental forcings and the response of ocean - cryosphere - solid earth systems.  The properties of these systems, such as mantle rheology or till thickness, can also be inferred from both passive and active studies. Impulsive events with small magnitudes (icequakes) and M = 5 teleseismically detected glacial earthquakes can be generated by calving or basal slip.  Continuous study of their time and space variability informs our understanding of climate change. In this joint symposium between IASPEI and IACS on "Cryoseismology," we invite submissions which cover the full gamut of seismology on and regarding the frozen earth. We encourage contributions treating the observation and modeling of seismic signals involving dynamics of ice sheets, sea ice, icebergs and glaciers, as well as changes to the thermal and physical structure of permafrost and snow.

     

     

  • JG01 - INTERACTIONS OF SOLID EARTH, ICE SHEETS AND OCEANS (IAG, IACS, IASPEI)

    Convener: Matt King (Australia, IACS/IAG)

    Co-Conveners: Pippa Whitehouse (UK, IACS/IAG), Martin Horwath (Germany, IAG), Bert Wouters (Netherlands, IACS), Anya Reading (Australia, IASPEI)

     

    Description

    Measurements of solid Earth, sea-level and ice-sheet change are influenced by a complex interaction of processes occurring over a large range of spatial and temporal scales. Proxy observations that constrain past ice sheets are influenced by glacial isostatic adjustment and changing mantle dynamic topography. Present-day observations of solid Earth deformation in one location are affected by present and past changes in global surface loading. Recent work highlights the role that solid Earth deformation has to play in controlling ice-sheet change, while seismological investigations are revealing crucial spatial variations in Earth rheology. In this symposium, we showcase model- and data-driven efforts to understand feedbacks between surface load changes and the solid Earth over all timescales.

     

    Topics include:

    • observations of mass changes in the cryosphere and oceans, and their interaction with solid Earth deformation
    • influence of mantle dynamic topography and glacial isostatic adjustment on paleo observations of sea level or ice sheet behaviour
    • seismic studies of the rheology of the solid Earth in the context of sea-level and ice-sheet studies

     

  • JM08 - EARTH SYSTEM MODELS: ASSESSING THE EARTH SYSTEM’S STATE AND FATE FROM REGIONAL TO PLANETARY SCALES (IAMAS, IAPSO, IACS, IAHS)

    Convener: Paul Kushner (Canada, IAMAS)

    Co-Conveners: Nathan Gillet (Canada, IAMAS), Marika Holland (USA, IAPSO), Gerhard Krinner (France, IACS), Sophie Nowicki (USA, IACS), Manuela Girotto (USA, IAHS), Stephen Déry (Canada, IAHS)

     

    Description

    Earth System Models provide our principal means to simulate Earth System processes and to predict the evolution of the planet. Each generation of Earth System Models, including components that simulate the atmosphere, oceans, land, vegetation, ice, snow, and the dynamical and biogeochemical processes that link these components, has provided new insights into the workings of the Earth System, predictions from seasonal to decadal scales, and projections of the future of the planet under greenhouse warming and other sources of radiative and compositional driving. These models have progressively simulated finer scales, and through regional refinement or downscaling can be used to investigate regional-scale climate processes and impacts. This symposium encourages contributions dealing with the many facets of Earth System Model development and application, including new modelling results from the Coupled Model Intercomparison Project Phase 6, development and assessment of models making use of recent Earth observations from ground-based and space-based measurements, prediction of climate on seasonal to centennial timescales, climate change detection and attribution, regional-scale climate modelling and process analysis, high resolution climate modelling, and subgrid scale parameterization development. As a joint symposium, submissions on the latest advances in Earth System Modeling across the atmospheric, biogeochemical, oceanic, cryospheric, and hydrological sciences are encouraged.

     

  • JM09 - SATELLITE REMOTE SENSING: VITAL INFORMATION ON THE HEALTH OF OUR PLANET (IAMAS, IACS, IAPSO, IAHS)

    Convener: Kaley Walker (Canada, IAMAS)

    Co-Conveners: Bojan Bojkov (Germany, IAMAS), Yangbo Chen (China, IAMAS), Paul Kushner (Canada, IACS), Stephen Howell (Canada, IACS), Stefano Vignudelli (Italy, IAPSO), Nicolas Grisouard (Canada, IAPSO),  Yanping Li (Canada, IAHS)

     

    Description

    Space-based observations provide a unique global perspective on the Earth's atmosphere and surface, including the oceans, land, vegetation, ice, and snow.  Current and planned satellite missions from Canada, and international agencies in US, Europe, China and Japan have provided and will  provide a wealth of new information about the Earth system and that can be used to investigate a wide range of environmental and scientific questions.  This symposium encourages contributions dealing with the many facets of space-based remote sensing, including new measurement technologies and techniques, both passive and active; retrieval algorithms; validation of satellite products; assimilation of data into numerical models; scientific results and discoveries and operational utilization and development.

     

  • JP04 - PAST CHANGES, IN THE ATMOSPHERE, OCEANS AND CRYOSPHERE, AND THEIR RELEVANCE FOR FUTURE CLIMATE. (IAPSO, IAMAS, IACS, IAGA)

    Convener: Karen Kohfeld (Canada, IAPSO)

    Co-Conveners: Qiuzhen Yin (Belgium, IAMAS), Anne de Vernal (Canada, IAMAS), Tilo von Dobeneck (Germany, IAGA), Molly O. Petterson (USA, IACS)

     

    Description

    Paleoceanographic and paleoclimatological research provides information on climate dynamics and biogeochemical cycling through time based on proxy reconstructions or model simulations of physical, chemical, and biological characteristics of the earth system. This symposium invites a wide range of data- and modeling-based presentations that aim to understand past behaviour of climate, ocean and ice. Submissions are encouraged on a range of topics, including glacial inceptions, millennial climate variability and abrupt change, characteristics of full glacial states, as well as past warm periods and their terminations as a means to better understand the future climate and its impacts on environment and ecosystems.

     

  • JS06 - OLD DATA FOR NEW KNOWLEDGE: PRESERVATION AND UTILIZATION OF HISTORICAL DATA IN THE GEOSCIENCES (IASPEI, IAG, IAHS, IAGA, IAMAS, IACS, IAPSO, IAVCEI)

    Convener: Josep Batlló Ortiz (Spain, IASPEI)

    Co-Conveners: Alberto Viglione (Austria, IAHS), József Ádám (Hungary, IAG), Edward Cliver (USA, IAGA), Kris Harper (USA, IAMAS), Bruce Raup (USA, IACS), Florence Fetterer (USA, IACS), E. Pattabhi Rama Rao (India, IAPSO), Roberto Carniel (Italy, IAVCEI)

     

    Description

    Studying a changing world needs long series of data. Moreover, reanalysis of old geophysical/geodetic data in the light of our present knowledge has become an important tool for understanding topics such as solar variability, climatic change, tectonics, earth rotation, and extreme natural events (e.g., magnetic storms, hurricanes, rainfall, floods, earthquakes etc.). Those old data are in analogue form and, many times, are contained in unique documents. Historical information may also be retrieved from documentary evidence such as narrative sources and legal-administrative institutional documentation (e.g. chronicles, newspapers, private and official protocols and correspondence, account books, etc.). Techniques and methodologies for preservation, dissemination, interpretation, homogenisation and use of such data, as well as for their present scientific use are important topics for advancing of our understanding of the changing Earth and of past extreme events. Different approaches have been devised to deal with different data and problems. Sharing the already large accumulated experience in the different fields covered by the IUGG shall contribute to improve our preservation and dissemination tools, our analysis methods and, ultimately, to further research results. This symposium welcomes contributions on:

    (a) Locating, assessing, preserving, and disseminating historical data about sunspots, polar motion, time and temperature measurements, magnetograms, seismograms, eruptions, glacier extent, tide gauge records, aurorae, flood/drought events and many others and

    (b) Methodologies and study cases using these historical data to advance our understanding of the Earth.

     

IUGG 2019 Conference Secretariat JPdL International

Tel.: 514-287-1070     Canada, USA: 1-800-361-1070