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Title: Greenland Surface Mass Balance as Simulated by the Community Earth System Model. Part I: Model Evaluation and 1850–2005 Results

Journal Article · · Journal of Climate
 [1];  [2];  [3];  [1];  [4];  [1]
  1. Utrecht Univ., Utrecht (Netherlands). Inst. for Marine and Atmospheric Research; Univ. of California, Berkeley, CA (United States). Dept. of Geography
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. National Center for Atmospheric Research, Boulder, CO (United States)
  4. Univ. of Colorado, Boulder, CO (United States). Dept. of Physics; Bristol Univ. (United Kingdom). Bristol Glaciology Centre, School of Geographical Sciences

The modeling of the surface mass balance (SMB) of the Greenland Ice Sheet (GIS) requires high-resolution models in order to capture the observed large gradients in the steep marginal areas. Until now, global climate models have not been considered suitable to model ice sheet SMB owing to model biases and insufficient resolution. This study analyzes the GIS SMB simulated for the period 1850–2005 by the Community Earth System Model (CESM), which includes a new ice sheet component with multiple elevation classes for SMB calculations. The model is evaluated against observational data and output from the regional model Regional Atmospheric Climate Model version 2 (RACMO2). Because of a lack of major climate biases, a sophisticated calculation of snow processes (including surface albedo evolution) and an adequate downscaling technique, CESM is able to realistically simulate GIS surface climate and SMB. CESM SMB agrees reasonably well with in situ data from 475 locations ($$r$$ = 0.80) and output from RACMO2 ($$r$$ = 0.79). The simulated mean SMB for 1960–2005 is 359 ± 120 Gt yr-1 in the range of estimates from regional climate models. The simulated seasonal mass variability is comparable with mass observations from the Gravity Recovery and Climate Experiment (GRACE), with synchronous annual maximum (May) and minimum (August–September) and similar amplitudes of the seasonal cycle. CESM is able to simulate the bands of precipitation maxima along the southeast and northwest margins, but absolute precipitation rates are underestimated along the southeastern margin and overestimated in the high interior. The model correctly simulates the major ablation areas. Total refreezing represents 35% of the available liquid water (the sum of rain and melt).

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; AC52-06NA25396
OSTI ID:
1565233
Journal Information:
Journal of Climate, Vol. 26, Issue 20; ISSN 0894-8755
Publisher:
American Meteorological SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (13)

North Atlantic Natural Variability Modulates Emergence of Widespread Greenland Melt in a Warming Climate journal September 2018
Modelling the climate and surface mass balance of polar ice sheets using RACMO2 – Part 1: Greenland (1958–2016) journal January 2018
Greenland Ice Sheet Surface Mass Loss: Recent Developments in Observation and Modeling journal November 2017
LIVVkit 2.1: automated and extensible ice sheet model validation journal January 2019
Towards Comprehensive Observing and Modeling Systems for Monitoring and Predicting Regional to Coastal Sea Level journal July 2019
Present-day and future Antarctic ice sheet climate and surface mass balance in the Community Earth System Model journal February 2016
Regional grid refinement in an Earth system model: impacts on the simulated Greenland surface mass balance journal January 2019
Surface mass balance downscaling through elevation classes in an Earth system model: application to the Greenland ice sheet journal January 2019
Assessment of the Greenland ice sheet–atmosphere feedbacks for the next century with a regional atmospheric model coupled to an ice sheet model journal January 2019
Evaluation of Greenland near surface air temperature datasets journal January 2017
Satellite Remote Sensing of the Greenland Ice Sheet Ablation Zone: A Review journal August 2019
Ice Sheet Model Intercomparison Project (ISMIP6) contribution to CMIP6 journal January 2016
The added value of high resolution in estimating the surface mass balance in southern Greenland journal June 2020

Figures / Tables (16)