A5003576248- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Climate variability and models
- Winter Sports Injuries and Performance
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Landslides and related hazards
- Geological Studies and Exploration
- Meteorological Phenomena and Simulations
- Scientific Computing and Data Management
- Aerospace Engineering and Energy Systems
- Geophysics and Gravity Measurements
- Polar Research and Ecology
- Environmental Impact and Sustainability
- Tree-ring climate responses
- Climate Change Policy and Economics
- Photocathodes and Microchannel Plates
- International Science and Diplomacy
- Atmospheric aerosols and clouds
- Climate Change and Health Impacts
- Meta-analysis and systematic reviews
- Research Data Management Practices
- Environmental Education and Sustainability
Los Alamos National Laboratory
2012-2022
Environment and Climate Change Canada
2022
Climate Centre
2022
Associated Research (United States)
2018-2020
University of Colorado Boulder
2020
TRC Companies (United States)
2019
Japan External Trade Organization
2014-2015
Victoria University of Wellington
2009-2011
University of Victoria
2006
This work documents the first version of U.S. Department Energy (DOE) new Exascale Earth System Model (E3SMv1). We focus on standard resolution fully coupled physical model designed to address DOE mission-relevant water cycle questions. Its components include atmosphere and land (110-km grid spacing), ocean sea ice (60 km in midlatitudes 30 at equator poles), river transport (55 km) models. base configuration will also serve as a foundation for additional configurations exploring higher...
We present climate and surface mass balance (SMB) of the Antarctic ice sheet (AIS) as simulated by global, coupled ocean–atmosphere–land Community Earth System Model (CESM) with a horizontal resolution $${\sim }1^\circ$$ in past, future (1850–2100). CESM correctly simulates present-day sea extent, large-scale atmospheric circulation near-surface climate, but fails to simulate recent expansion ice. The SMB equals $$2280 \pm 131$$ $$\mathrm {Gt\,year^{-1}}$$ , which concurs existing...
Abstract Ice sheet response to forced changes—such as that from anthropogenic climate forcing—is closely regulated by two‐way interactions with other components of the Earth system. These encompass ice system forcing, change, and feedbacks resulting coupled sheet/Earth evolution. Motivated impact Antarctic Greenland change on future sea level rise, here we review state knowledge feedbacks. We also describe emerging observation model‐based methods can improve understanding particularly focus...
Abstract The Glimmer Community Ice Sheet Model (Glimmer-CISM) has been implemented in the Earth System (CESM). Glimmer-CISM is forced by a surface mass balance (SMB) computed multiple elevation classes CESM land model and downscaled to ice sheet grid. evolution governed shallow-ice approximation with thermomechanical coupling basal sliding. This paper describes evaluates initial implementation for Greenland (GIS). was spun up using SMB from coupled simulation preindustrial forcing. model's...
Abstract. We describe and evaluate version 2.1 of the Community Ice Sheet Model (CISM). CISM is a parallel, 3-D thermomechanical model, written mainly in Fortran, that solves equations for momentum balance thickness temperature evolution ice sheets. CISM's velocity solver incorporates hierarchy Stokes flow approximations, including shallow-shelf, depth-integrated higher order, order. also includes suite test cases, links to third-party libraries, parameterizations physical processes such as...
Modeling and observations suggest that Thwaites Glacier, West Antarctica, has begun unstable retreat. Concurrently, oceanographic have revealed substantial multiyear variability in the temperature of ocean water driving retreat through melting ice shelf restrains inland glacier flow. Using an ensemble 72 ice‐sheet model simulations include idealized representation variability, we find variable ice‐shelf causes delays grounding line retreat, mass loss, sea level contribution relative to...
The processes responsible for freshwater flux from the Antarctic Ice Sheet (AIS), ice-shelf basal melting and iceberg calving, are generally poorly represented in current Earth System Models (ESMs). Here we document cryosphere configuration of U.S. Department Energy's Energy Exascale Model (E3SM) v1.2. This includes simulating melting, which has been implemented through ocean circulation within static cavities, allowing ability to calculate melt rates associated heat fluxes. In addition,...
Abstract Earth system/ice‐sheet coupling is an area of recent, major System Model (ESM) development. This work occurs at the intersection glaciology and climate science motivated by a need for robust projections sea‐level rise. The Community Ice Sheet version 2 (CISM2) newest component model (CESM2). study describes novel capabilities model, including: (1) advanced energy‐balance‐based surface mass balance calculation in land with downscaling via elevation classes; (2) closed freshwater...
Abstract. The need to better understand long-term climate/ice sheet feedback loops is motivating efforts couple ice models into Earth System which are capable of long-timescale simulations. In this paper we describe a coupled model that consists the University Victoria Climate Model (UVic ESCM) and Pennsylvania State Ice (PSUI). climate generates surface mass balance (SMB) field via sub-gridded energy/moisture resolves narrow ablation zones. returns revised elevation, albedo area fields,...
Abstract. We describe and evaluate version 2.1 of the Community Ice Sheet Model (CISM). CISM is a parallel, 3D thermomechanical model, written mainly in Fortran 90/95, that solves equations for momentum balance thickness temperature evolution ice sheets. CISM's velocity solver incorporates hierarchy Stokes-flow approximations, including shallow-shelf, depth-integrated higher-order, higher-order. also includes suite test cases, links to third-party libraries, parameterizations physical...
xclim is a Python library that enables computation of climate indicators over large, heterogeneous data sets.It built using xarray objects and operations, can seamlessly benefit from the parallelization handling provided by dask, relies on community conventions for formatting metadata attributes.xclim meant as tool to facilitate both science research delivery operational services products.In addition indicator calculations, also includes utilities bias correction statistical adjustment,...
Abstract Although precipitation is a primary control on Antarctic ice sheet (AIS) mass balance, long‐term historical AIS trends and their underlying external climate drivers remain inconclusive. In this study, we use novel pair of model ensembles to identify simulated spatial signature ozone depletion‐forced change. Distinct areas little change or decrease, arising from interaction between atmospheric circulation changes topography, are outweighed by large‐scale increases. This bears notable...
Abstract The climate scenarios that form the basis for current risk assessments have no assigned probabilities, and this impedes analysis of future risks. This paper proposes an approach to estimate probability carbon dioxide (CO 2 ) concentration used in key change modeling experiments. It computes CO emissions compatible with concentrations prescribed by Coupled Model Intercomparison Project Phase 5 (CMIP5) CMIP6 distribution these cumulative is interpreted as likelihood given a pathway....
Abstract. Annually averaged precipitation in the form of snow, dominant term Antarctic Ice Sheet surface mass balance, displays large spatial and temporal variability. Here we present an analysis patterns regional variability their impact on integrated balance simulated as part a preindustrial 1800-year global, fully coupled Community Earth System Model simulation. Correlation composite analyses based this output allow for robust exploration We identify statistically significant...
Spinning up a highly complex, coupled Earth system model (ESM) is time consuming and computationally demanding exercise. For models with interactive ice sheet components, this becomes major challenge, as sheets are sensitive to bidirectional feedback processes equilibrate over glacial timescales of many millennia. This work describes demonstrates tractable, iterative procedure for spinning contemporary, complex ESM that includes an component. The alternates between expensive configuration...
Abstract The Greenland ice sheet (GrIS) is now losing mass at a rate of 0.7 mm sea level rise (SLR) per year. Here we explore future GrIS evolution and interactions with global regional climate under high greenhouse gas forcing the Community Earth System Model version 2.1 (CESM2.1), which includes an interactive component (the Ice Sheet v2.1 [CISM2.1]) advanced energy balance‐based calculation surface melt. We run idealized 350‐year scenario in atmospheric CO 2 concentration increases by 1%...
Abstract. We conduct sensitivity experiments using a general circulation model that has an explicit water source tagging capability forced by prescribed composites of pre-industrial sea-ice concentrations (SICs) and corresponding sea surface temperatures (SSTs) to understand the impact anomalies on regional evaporation, moisture transport source–receptor relationships for Antarctic precipitation in absence anthropogenic forcing. Surface sensible heat fluxes, evaporation column-integrated...
Abstract The integrated surface mass balance (SMB) of the Greenland ice sheet (GrIS) has large interannual variability. Long‐term future changes to this variability will affect GrIS dynamics, freshwater fluxes, regional oceanography, and detection in volume trends. Here we analyze a simulated 1850–2100 SMB time series from Community Earth System Model, currently only global climate model that realistically simulates SMB. We find significant increase over time, which attribute primarily shift...
Abstract. A transient technique for generating ice sheet preindustrial initial conditions long-term coupled sheet/climate model simulations is developed and demonstrated over the Greenland using Community Earth System Model (CESM). End-member paleoclimate of last glacial maximum, mid-Holocene optimum are combined weighting provided by core data time series to derive continuous energy-balance-model-derived surface mass balance temperature fields, which subsequently used force a long...
Abstract Surface mass balance (SMB) trends influence observed Greenland Ice Sheet (GrIS) loss, but the component of these related to anthropogenic forcing is unclear. Here we study simulated spatial pattern emergence an anthropogenically derived GrIS SMB signal between 1850 and 2100 using Community Earth System Model. We find timing heterogeneity, with a bimodal structure reflecting interior snowfall increases against background low variability, peripheral surface melting backdrop high...