The Impact of Global Warming on the Antarctic Mass Balance and Global Sea Level
The onset of global warming from increasing greenhouse gases in the atmosphere can have a number of important different impacts on the Antarctic ice sheet. These include increasing basal melt of ice shelves, faster flow of the grounded ice, increased surface ablation in coastal regions, and increase...
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ftdtic:ADP007330 2023-05-15T13:38:48+02:00 The Impact of Global Warming on the Antarctic Mass Balance and Global Sea Level Budd, W. F. Simmonds, Ian MELBOURNE UNIV PARKVILLE (AUSTRALIA) 1992-03 text/html http://www.dtic.mil/docs/citations/ADP007330 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007330 en eng http://www.dtic.mil/docs/citations/ADP007330 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Geography Meteorology Snow Ice and Permafrost *BALANCE *ICE *IMPACT *MASS *SEA LEVEL *SHEETS *ANTARCTIC REGIONS ABLATION ACCUMULATION ATMOSPHERES CIRCULATION CLIMATE COASTAL REGIONS EVAPORATION FLOW FLOW RATE GLOBAL MELTS MODELS NETS NUMBERS OCEANS PRECIPITATION RATES REGIONS SIMULATION SURFACES TIME SYMPOSIA Component Reports *Global warming Greenhouse gases. Text 1992 ftdtic 2016-02-19T17:39:41Z The onset of global warming from increasing greenhouse gases in the atmosphere can have a number of important different impacts on the Antarctic ice sheet. These include increasing basal melt of ice shelves, faster flow of the grounded ice, increased surface ablation in coastal regions, and increased precipitation over the interior. An analysis of these separate terms by ice sheet modeling indicates that the impact of increasing ice sheet flow rates on sea level does not become a dominant factor until 100--200 years after the realization of the warming. For the time period of the next 100 years the most important impact on sea level from the Antarctic mass balance can be expected to result from increasing precipitation minus evaporation balance over the grounded ice. The present Antarctic net accumulation and coastal ice flux each amount to about 2000 km3 yr-1, both of which on their own would equate to approximately 6 mm yr-1 of sea level change. The present rate of sea level rise of about 1.2 mm yr-1 is therefore equivalent to about 20% imbalance in the Antarctic mass fluxes. The magnitude of the changes to the Antarctic precipitation and evaporation have been studied by a series of General Circulation Model experiments, using a model which gives a reasonable simulation of the present Antarctic climate, including precipitation and evaporation. This article is from 'Proceedings of the International Conference on the Role of the Polar Regions in Global Change Held in Fairbanks, Alaska on 11-15 June 990. Volume 2', AD-A253 028, p489-494. See also Volume 1, AD-A253 027. Text Antarc* Antarctic Ice Ice Sheet Ice Shelves permafrost Alaska Defense Technical Information Center: DTIC Technical Reports database Antarctic The Antarctic Fairbanks |
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Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Geography Meteorology Snow Ice and Permafrost *BALANCE *ICE *IMPACT *MASS *SEA LEVEL *SHEETS *ANTARCTIC REGIONS ABLATION ACCUMULATION ATMOSPHERES CIRCULATION CLIMATE COASTAL REGIONS EVAPORATION FLOW FLOW RATE GLOBAL MELTS MODELS NETS NUMBERS OCEANS PRECIPITATION RATES REGIONS SIMULATION SURFACES TIME SYMPOSIA Component Reports *Global warming Greenhouse gases. |
spellingShingle |
Geography Meteorology Snow Ice and Permafrost *BALANCE *ICE *IMPACT *MASS *SEA LEVEL *SHEETS *ANTARCTIC REGIONS ABLATION ACCUMULATION ATMOSPHERES CIRCULATION CLIMATE COASTAL REGIONS EVAPORATION FLOW FLOW RATE GLOBAL MELTS MODELS NETS NUMBERS OCEANS PRECIPITATION RATES REGIONS SIMULATION SURFACES TIME SYMPOSIA Component Reports *Global warming Greenhouse gases. Budd, W. F. Simmonds, Ian The Impact of Global Warming on the Antarctic Mass Balance and Global Sea Level |
topic_facet |
Geography Meteorology Snow Ice and Permafrost *BALANCE *ICE *IMPACT *MASS *SEA LEVEL *SHEETS *ANTARCTIC REGIONS ABLATION ACCUMULATION ATMOSPHERES CIRCULATION CLIMATE COASTAL REGIONS EVAPORATION FLOW FLOW RATE GLOBAL MELTS MODELS NETS NUMBERS OCEANS PRECIPITATION RATES REGIONS SIMULATION SURFACES TIME SYMPOSIA Component Reports *Global warming Greenhouse gases. |
description |
The onset of global warming from increasing greenhouse gases in the atmosphere can have a number of important different impacts on the Antarctic ice sheet. These include increasing basal melt of ice shelves, faster flow of the grounded ice, increased surface ablation in coastal regions, and increased precipitation over the interior. An analysis of these separate terms by ice sheet modeling indicates that the impact of increasing ice sheet flow rates on sea level does not become a dominant factor until 100--200 years after the realization of the warming. For the time period of the next 100 years the most important impact on sea level from the Antarctic mass balance can be expected to result from increasing precipitation minus evaporation balance over the grounded ice. The present Antarctic net accumulation and coastal ice flux each amount to about 2000 km3 yr-1, both of which on their own would equate to approximately 6 mm yr-1 of sea level change. The present rate of sea level rise of about 1.2 mm yr-1 is therefore equivalent to about 20% imbalance in the Antarctic mass fluxes. The magnitude of the changes to the Antarctic precipitation and evaporation have been studied by a series of General Circulation Model experiments, using a model which gives a reasonable simulation of the present Antarctic climate, including precipitation and evaporation. This article is from 'Proceedings of the International Conference on the Role of the Polar Regions in Global Change Held in Fairbanks, Alaska on 11-15 June 990. Volume 2', AD-A253 028, p489-494. See also Volume 1, AD-A253 027. |
author2 |
MELBOURNE UNIV PARKVILLE (AUSTRALIA) |
format |
Text |
author |
Budd, W. F. Simmonds, Ian |
author_facet |
Budd, W. F. Simmonds, Ian |
author_sort |
Budd, W. F. |
title |
The Impact of Global Warming on the Antarctic Mass Balance and Global Sea Level |
title_short |
The Impact of Global Warming on the Antarctic Mass Balance and Global Sea Level |
title_full |
The Impact of Global Warming on the Antarctic Mass Balance and Global Sea Level |
title_fullStr |
The Impact of Global Warming on the Antarctic Mass Balance and Global Sea Level |
title_full_unstemmed |
The Impact of Global Warming on the Antarctic Mass Balance and Global Sea Level |
title_sort |
impact of global warming on the antarctic mass balance and global sea level |
publishDate |
1992 |
url |
http://www.dtic.mil/docs/citations/ADP007330 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007330 |
geographic |
Antarctic The Antarctic Fairbanks |
geographic_facet |
Antarctic The Antarctic Fairbanks |
genre |
Antarc* Antarctic Ice Ice Sheet Ice Shelves permafrost Alaska |
genre_facet |
Antarc* Antarctic Ice Ice Sheet Ice Shelves permafrost Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADP007330 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766111262505172992 |