Numerical estimation of 10000 years later equilibrium ice sheet profile in the Shirase Glacier drainage basin, East Antarctica
Recent observations show that the ice sheet in the Shirase Glacier drainage basin, East Antarctica, is thinning. If the observed thinning is assumed to be a transitional process in which the ice sheet is adjusting to the present climate, an equilibrium ice sheet profile which adjusts to the present...
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National Institute of Polar Research
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ftdoajarticles:oai:doaj.org/article:b450009961274bd7aa2cad14a6319213 2023-05-15T13:51:07+02:00 Numerical estimation of 10000 years later equilibrium ice sheet profile in the Shirase Glacier drainage basin, East Antarctica Shuji Fujita Norikazu Ikeda Nobuhiko Azuma Takeo Hondoh Shinji Mae 1991-03-01T00:00:00Z https://doi.org/10.15094/00008708 https://doaj.org/article/b450009961274bd7aa2cad14a6319213 EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00008708 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008708 0085-7289 2432-079X https://doaj.org/article/b450009961274bd7aa2cad14a6319213 Antarctic Record, Vol 35, Iss 1, Pp 12-29 (1991) Geography (General) G1-922 article 1991 ftdoajarticles https://doi.org/10.15094/00008708 2022-12-31T02:03:24Z Recent observations show that the ice sheet in the Shirase Glacier drainage basin, East Antarctica, is thinning. If the observed thinning is assumed to be a transitional process in which the ice sheet is adjusting to the present climate, an equilibrium ice sheet profile which adjusts to the present climate would provide us with information for understanding the present behavior of the ice sheet. The equilibrium ice sheet profile was estimated by using a three-dimensional non-steady state ice sheet model. Estimations were carried out with data based on observations of bedrock topography, surface elevation, accumulation rate and surface temperatures, and their extrapolation for areas where there is no field data. And the equilibrium ice sheet profile against various parameters, e.g. surface temperatures, accumulation rate and geothermal heat flux, was investigated. Results of the calculation showed that an almost stationary state of the ice sheet was achieved after (10)^4 model years when started from the present profile of the ice sheet. The equilibrium ice sheet profile depended on bedrock topography and tested parameters sensitively, but the calculations indicated that ice-thickness tend to decrease in the middle-stream region in general. It was also revealed that the ice sheet in the vicinity of the Yamato Mountains was relatively stable even if the parameters were changed. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice Sheet Shirase Glacier Directory of Open Access Journals: DOAJ Articles East Antarctica Shirase Glacier ENVELOPE(39.000,39.000,-70.333,-70.333) Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Shuji Fujita Norikazu Ikeda Nobuhiko Azuma Takeo Hondoh Shinji Mae Numerical estimation of 10000 years later equilibrium ice sheet profile in the Shirase Glacier drainage basin, East Antarctica |
topic_facet |
Geography (General) G1-922 |
description |
Recent observations show that the ice sheet in the Shirase Glacier drainage basin, East Antarctica, is thinning. If the observed thinning is assumed to be a transitional process in which the ice sheet is adjusting to the present climate, an equilibrium ice sheet profile which adjusts to the present climate would provide us with information for understanding the present behavior of the ice sheet. The equilibrium ice sheet profile was estimated by using a three-dimensional non-steady state ice sheet model. Estimations were carried out with data based on observations of bedrock topography, surface elevation, accumulation rate and surface temperatures, and their extrapolation for areas where there is no field data. And the equilibrium ice sheet profile against various parameters, e.g. surface temperatures, accumulation rate and geothermal heat flux, was investigated. Results of the calculation showed that an almost stationary state of the ice sheet was achieved after (10)^4 model years when started from the present profile of the ice sheet. The equilibrium ice sheet profile depended on bedrock topography and tested parameters sensitively, but the calculations indicated that ice-thickness tend to decrease in the middle-stream region in general. It was also revealed that the ice sheet in the vicinity of the Yamato Mountains was relatively stable even if the parameters were changed. |
format |
Article in Journal/Newspaper |
author |
Shuji Fujita Norikazu Ikeda Nobuhiko Azuma Takeo Hondoh Shinji Mae |
author_facet |
Shuji Fujita Norikazu Ikeda Nobuhiko Azuma Takeo Hondoh Shinji Mae |
author_sort |
Shuji Fujita |
title |
Numerical estimation of 10000 years later equilibrium ice sheet profile in the Shirase Glacier drainage basin, East Antarctica |
title_short |
Numerical estimation of 10000 years later equilibrium ice sheet profile in the Shirase Glacier drainage basin, East Antarctica |
title_full |
Numerical estimation of 10000 years later equilibrium ice sheet profile in the Shirase Glacier drainage basin, East Antarctica |
title_fullStr |
Numerical estimation of 10000 years later equilibrium ice sheet profile in the Shirase Glacier drainage basin, East Antarctica |
title_full_unstemmed |
Numerical estimation of 10000 years later equilibrium ice sheet profile in the Shirase Glacier drainage basin, East Antarctica |
title_sort |
numerical estimation of 10000 years later equilibrium ice sheet profile in the shirase glacier drainage basin, east antarctica |
publisher |
National Institute of Polar Research |
publishDate |
1991 |
url |
https://doi.org/10.15094/00008708 https://doaj.org/article/b450009961274bd7aa2cad14a6319213 |
long_lat |
ENVELOPE(39.000,39.000,-70.333,-70.333) ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
East Antarctica Shirase Glacier Yamato |
geographic_facet |
East Antarctica Shirase Glacier Yamato |
genre |
Antarc* Antarctica East Antarctica Ice Sheet Shirase Glacier |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet Shirase Glacier |
op_source |
Antarctic Record, Vol 35, Iss 1, Pp 12-29 (1991) |
op_relation |
http://doi.org/10.15094/00008708 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00008708 0085-7289 2432-079X https://doaj.org/article/b450009961274bd7aa2cad14a6319213 |
op_doi |
https://doi.org/10.15094/00008708 |
_version_ |
1766254709852602368 |