Modelling the climate and surface mass balance of polar ice sheets using RACMO2-Part 2: Antarctica (1979-2016)
We evaluate modelled Antarctic ice sheet (AIS) near-surface climate, surface mass balance (SMB) and surface energy balance (SEB) from the updated polar version of the regional atmospheric climate model, RACMO2 (1979–2016). The updated model, referred to as RACMO2.3p2, incorporates upper-air relaxati...
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ftunicolboulder:oai:scholar.colorado.edu:atoc_facpapers-1065 2023-05-15T13:49:37+02:00 Modelling the climate and surface mass balance of polar ice sheets using RACMO2-Part 2: Antarctica (1979-2016) Lenaerts, Jan 2018-01-01T08:00:00Z application/pdf https://scholar.colorado.edu/atoc_facpapers/64 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1065&context=atoc_facpapers unknown CU Scholar https://scholar.colorado.edu/atoc_facpapers/64 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1065&context=atoc_facpapers http://creativecommons.org/licenses/by/4.0/ CC-BY Atmospheric & Oceanic Sciences Faculty Contributions Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology AUTOMATIC WEATHER STATIONS DIGITAL ELEVATION MODEL ENERGY-BALANCE EAST ANTARCTICA AIRBORNE-RADAR DRIFTING SNOW BLOWING SNOW LASER DATA GREENLAND FIRN text 2018 ftunicolboulder 2019-05-17T23:29:23Z We evaluate modelled Antarctic ice sheet (AIS) near-surface climate, surface mass balance (SMB) and surface energy balance (SEB) from the updated polar version of the regional atmospheric climate model, RACMO2 (1979–2016). The updated model, referred to as RACMO2.3p2, incorporates upper-air relaxation, a revised topography, tuned parameters in the cloud scheme to generate more precipitation towards the AIS interior and modified snow properties reducing drifting snow sublimation and increasing surface snowmelt.Comparisons of RACMO2 model output with several independent observational data show that the existing biases in AIS temperature, radiative fluxes and SMB components are further reduced with respect to the previous model version. The model-integrated annual average SMB for the ice sheet including ice shelves (minus the Antarctic Peninsula, AP) now amounts to 2229 Gt y−1, with an interannual variability of 109 Gt y−1. The largest improvement is found in modelled surface snowmelt, which now compares well with satellite and weather station observations. For the high-resolution ( ∼ 5.5 km) AP simulation, results remain comparable to earlier studies.The updated model provides a new, high-resolution data set of the contemporary near-surface climate and SMB of the AIS; this model version will be used for future climate scenario projections in a forthcoming study. Text Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Greenland Ice Sheet Ice Shelves University of Colorado, Boulder: CU Scholar Antarctic The Antarctic Antarctic Peninsula East Antarctica Greenland |
institution |
Open Polar |
collection |
University of Colorado, Boulder: CU Scholar |
op_collection_id |
ftunicolboulder |
language |
unknown |
topic |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology AUTOMATIC WEATHER STATIONS DIGITAL ELEVATION MODEL ENERGY-BALANCE EAST ANTARCTICA AIRBORNE-RADAR DRIFTING SNOW BLOWING SNOW LASER DATA GREENLAND FIRN |
spellingShingle |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology AUTOMATIC WEATHER STATIONS DIGITAL ELEVATION MODEL ENERGY-BALANCE EAST ANTARCTICA AIRBORNE-RADAR DRIFTING SNOW BLOWING SNOW LASER DATA GREENLAND FIRN Lenaerts, Jan Modelling the climate and surface mass balance of polar ice sheets using RACMO2-Part 2: Antarctica (1979-2016) |
topic_facet |
Science & Technology Physical Sciences Geography Physical Geosciences Multidisciplinary Physical Geography Geology AUTOMATIC WEATHER STATIONS DIGITAL ELEVATION MODEL ENERGY-BALANCE EAST ANTARCTICA AIRBORNE-RADAR DRIFTING SNOW BLOWING SNOW LASER DATA GREENLAND FIRN |
description |
We evaluate modelled Antarctic ice sheet (AIS) near-surface climate, surface mass balance (SMB) and surface energy balance (SEB) from the updated polar version of the regional atmospheric climate model, RACMO2 (1979–2016). The updated model, referred to as RACMO2.3p2, incorporates upper-air relaxation, a revised topography, tuned parameters in the cloud scheme to generate more precipitation towards the AIS interior and modified snow properties reducing drifting snow sublimation and increasing surface snowmelt.Comparisons of RACMO2 model output with several independent observational data show that the existing biases in AIS temperature, radiative fluxes and SMB components are further reduced with respect to the previous model version. The model-integrated annual average SMB for the ice sheet including ice shelves (minus the Antarctic Peninsula, AP) now amounts to 2229 Gt y−1, with an interannual variability of 109 Gt y−1. The largest improvement is found in modelled surface snowmelt, which now compares well with satellite and weather station observations. For the high-resolution ( ∼ 5.5 km) AP simulation, results remain comparable to earlier studies.The updated model provides a new, high-resolution data set of the contemporary near-surface climate and SMB of the AIS; this model version will be used for future climate scenario projections in a forthcoming study. |
format |
Text |
author |
Lenaerts, Jan |
author_facet |
Lenaerts, Jan |
author_sort |
Lenaerts, Jan |
title |
Modelling the climate and surface mass balance of polar ice sheets using RACMO2-Part 2: Antarctica (1979-2016) |
title_short |
Modelling the climate and surface mass balance of polar ice sheets using RACMO2-Part 2: Antarctica (1979-2016) |
title_full |
Modelling the climate and surface mass balance of polar ice sheets using RACMO2-Part 2: Antarctica (1979-2016) |
title_fullStr |
Modelling the climate and surface mass balance of polar ice sheets using RACMO2-Part 2: Antarctica (1979-2016) |
title_full_unstemmed |
Modelling the climate and surface mass balance of polar ice sheets using RACMO2-Part 2: Antarctica (1979-2016) |
title_sort |
modelling the climate and surface mass balance of polar ice sheets using racmo2-part 2: antarctica (1979-2016) |
publisher |
CU Scholar |
publishDate |
2018 |
url |
https://scholar.colorado.edu/atoc_facpapers/64 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1065&context=atoc_facpapers |
geographic |
Antarctic The Antarctic Antarctic Peninsula East Antarctica Greenland |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula East Antarctica Greenland |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Greenland Ice Sheet Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Greenland Ice Sheet Ice Shelves |
op_source |
Atmospheric & Oceanic Sciences Faculty Contributions |
op_relation |
https://scholar.colorado.edu/atoc_facpapers/64 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1065&context=atoc_facpapers |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766251885612761088 |