TEMPORAL AND SPATIAL FLUCTUATIONS OF WARMING IN ANTARCTICA AND THE ATMOSPHERIC CIRCULATION
An abrupt and extreme warming was observed in the mid-winter season, in June 1994. The air temperature increased from -72℃ to -36℃ in two days. This warming caused reduced cooling of air temperature in the winter and hence resulted in increase of the temperature throughout a month. The area of warmi...
| Main Authors: | , |
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| Format: | Report |
| Language: | English |
| Published: |
ABSTRACT
1997
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| Subjects: | |
| Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4010 http://id.nii.ac.jp/1291/00004010/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4010&item_no=1&attribute_id=18&file_no=1 |
| Summary: | An abrupt and extreme warming was observed in the mid-winter season, in June 1994. The air temperature increased from -72℃ to -36℃ in two days. This warming caused reduced cooling of air temperature in the winter and hence resulted in increase of the temperature throughout a month. The area of warming and its temperature change were analyzed by using the passive microwave radiometer (DMSP SSM/I) data. This area appeared first in the coastal region around the Lambert Glacier, East Antarctica and expanded to the inland areas over Dome Fuji, then diminished over the Dome C area. The weather chart showed a high pressure area over East Antarctica, and advection of air from the coastal region to the inland areas of Antarctica. A blocking of high pressure was detected in the higher troposphere and persisted for several weeks. The seasonal variations of the polar vortex in the stratosphere (30hPa) showed a westward shift of the center area in the corresponding period. This event is important to understand the Antarctic climate and also exchange processes of polar air masses. |
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