q 1997 American Meteorological Society Forcing of the Austral Autumn Surface Pressure Change over the Antarctic Continent*
Pronounced seasonal variations in the surface pressure field are present over the Antarctic continent. Surface pressures over the ice sheet decrease during the austral autumn period January–April and increase during the austral springtime months September–December. The largest changes are found over...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.669.1237 2023-05-15T13:52:56+02:00 q 1997 American Meteorological Society Forcing of the Austral Autumn Surface Pressure Change over the Antarctic Continent* Thomas R. Parish Yuhang Wang David H. Bromwich The Pennsylvania State University CiteSeerX Archives 1995 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.1237 http://polarmet.osu.edu/PMG_publications/parish_wang_jas_1997.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.1237 http://polarmet.osu.edu/PMG_publications/parish_wang_jas_1997.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://polarmet.osu.edu/PMG_publications/parish_wang_jas_1997.pdf text 1995 ftciteseerx 2016-01-08T17:14:21Z Pronounced seasonal variations in the surface pressure field are present over the Antarctic continent. Surface pressures over the ice sheet decrease during the austral autumn period January–April and increase during the austral springtime months September–December. The largest changes are found over the highest portions of the Antarctic ice sheets where seasonal surface pressure changes of up to 20 hPa are common. The outstanding feature of these surface pressure changes is that typically the isallobaric contours closely follow the Antarctic orography during both transition periods, suggesting a strong seasonal diabatic adjustment within the lower troposphere. During austral autumn, the pronounced cooling of the lower atmosphere adjacent to the ice sheets leads to an enhancement of the Antarctic katabatic wind regime and hence the lower branch of the mean meridional circulation over the high southern latitudes. The mass transport provided by these drainage flows is proposed as the mechanism behind the autumn pressure falls. Numerical simulations of the evolution of the Antarctic katabatic wind regime indicate that the radiative cooling of the sloping ice fields and attendant mass transport result in a modification of the temperature and pressure fields in the lower troposphere similar to what is seen during the early austral autumn period. 1. Text Antarc* Antarctic Ice Sheet Unknown Antarctic Austral The Antarctic |
institution |
Open Polar |
collection |
Unknown |
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ftciteseerx |
language |
English |
description |
Pronounced seasonal variations in the surface pressure field are present over the Antarctic continent. Surface pressures over the ice sheet decrease during the austral autumn period January–April and increase during the austral springtime months September–December. The largest changes are found over the highest portions of the Antarctic ice sheets where seasonal surface pressure changes of up to 20 hPa are common. The outstanding feature of these surface pressure changes is that typically the isallobaric contours closely follow the Antarctic orography during both transition periods, suggesting a strong seasonal diabatic adjustment within the lower troposphere. During austral autumn, the pronounced cooling of the lower atmosphere adjacent to the ice sheets leads to an enhancement of the Antarctic katabatic wind regime and hence the lower branch of the mean meridional circulation over the high southern latitudes. The mass transport provided by these drainage flows is proposed as the mechanism behind the autumn pressure falls. Numerical simulations of the evolution of the Antarctic katabatic wind regime indicate that the radiative cooling of the sloping ice fields and attendant mass transport result in a modification of the temperature and pressure fields in the lower troposphere similar to what is seen during the early austral autumn period. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Thomas R. Parish Yuhang Wang David H. Bromwich |
spellingShingle |
Thomas R. Parish Yuhang Wang David H. Bromwich q 1997 American Meteorological Society Forcing of the Austral Autumn Surface Pressure Change over the Antarctic Continent* |
author_facet |
Thomas R. Parish Yuhang Wang David H. Bromwich |
author_sort |
Thomas R. Parish |
title |
q 1997 American Meteorological Society Forcing of the Austral Autumn Surface Pressure Change over the Antarctic Continent* |
title_short |
q 1997 American Meteorological Society Forcing of the Austral Autumn Surface Pressure Change over the Antarctic Continent* |
title_full |
q 1997 American Meteorological Society Forcing of the Austral Autumn Surface Pressure Change over the Antarctic Continent* |
title_fullStr |
q 1997 American Meteorological Society Forcing of the Austral Autumn Surface Pressure Change over the Antarctic Continent* |
title_full_unstemmed |
q 1997 American Meteorological Society Forcing of the Austral Autumn Surface Pressure Change over the Antarctic Continent* |
title_sort |
q 1997 american meteorological society forcing of the austral autumn surface pressure change over the antarctic continent* |
publishDate |
1995 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.1237 http://polarmet.osu.edu/PMG_publications/parish_wang_jas_1997.pdf |
geographic |
Antarctic Austral The Antarctic |
geographic_facet |
Antarctic Austral The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
http://polarmet.osu.edu/PMG_publications/parish_wang_jas_1997.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.669.1237 http://polarmet.osu.edu/PMG_publications/parish_wang_jas_1997.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766257819128954880 |