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Title: High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870–2012 using reanalysis data

Journal Article · · Journal of Glaciology
DOI:https://doi.org/10.1017/jog.2016.133· OSTI ID:1358439
 [1];  [1];  [1];  [1];  [2];  [3];  [4]
  1. Univ. of Sheffield, Sheffield (United Kingdom)
  2. Utrecht Univ., Utrecht (The Netherlands)
  3. Univ. of Liege, Liege (Belgium)
  4. Vrije Univ. Brussel, Brussels (Belgium)

Here, we show results from a positive degree-day (PDD) model of Greenland ice sheet (GrIS) surface mass balance (SMB), 1870–2012, forced with reanalysis data. The model includes an improved daily temperature parameterization as compared with a previous version and is run at 1 km rather than 5 km resolution. The improvements lead overall to higher SMB with the same forcing data. We also compare our model with results from two regional climate models (RCMs). While there is good qualitative agreement between our PDD model and the RCMs, it usually results in lower precipitation and lower runoff but approximately equivalent SMB: mean 1979–2012 SMB (± standard deviation), in Gt a–1, is 382 ± 78 in the PDD model, compared with 379 ± 101 and 425 ± 90 for the RCMs. Comparison with in situ SMB observations suggests that the RCMs may be more accurate than PDD at local level, in some areas, although the latter generally compares well. Dividing the GrIS into seven drainage basins we show that SMB has decreased sharply in all regions since 2000. Finally we show correlation between runoff close to two calving glaciers and either calving front retreat or calving flux, this being most noticeable from the mid-1990s.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of Sheffield, Sheffield (United Kingdom)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0009988
OSTI ID:
1358439
Journal Information:
Journal of Glaciology, Vol. 63, Issue 237; ISSN 0022-1430
Publisher:
International Glaciological SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (16)

Greenland Ice Sheet Surface Mass Loss: Recent Developments in Observation and Modeling journal November 2017
Estimating Greenland surface melt is hampered by melt induced dampening of temperature variability journal March 2018
A simple physics-based improvement to the positive degree day model journal July 2018
Evaluation of Reconstructions of Snow/Ice Melt in Greenland by Regional Atmospheric Climate Models Using Laser Altimetry Data journal August 2018
Space‐Time Evolution of Greenland Ice Sheet Elevation and Mass From Envisat and GRACE Data journal August 2019
Linear response of east Greenland’s tidewater glaciers to ocean/atmosphere warming journal July 2018
The Influence of Hydrology on the Dynamics of Land-Terminating Sectors of the Greenland Ice Sheet journal February 2019
The Case for a Sustained Greenland Ice Sheet-Ocean Observing System (GrIOOS) journal March 2019
Extreme temperature events on Greenland in observations and the MAR regional climate model journal January 2018
Brief communication: An ice surface melt scheme including the diurnal cycle of solar radiation journal January 2018
NHM–SMAP: spatially and temporally high-resolution nonhydrostatic atmospheric model coupled with detailed snow process model for Greenland Ice Sheet journal January 2018
Modelling the climate and surface mass balance of polar ice sheets using RACMO2 – Part 1: Greenland (1958–2016) journal January 2018
Surface mass balance downscaling through elevation classes in an Earth system model: application to the Greenland ice sheet journal January 2019
Extreme temperature events on Greenland in observations and the MAR regional climate model journal July 2017
Brief communication: An Ice surface melt scheme including the diurnal cycle of solar radiation journal July 2018
Linear response of east Greenland's tidewater glaciers to ocean/atmosphere warming. text January 2018