COMPARATIVE STUDY OF THE SURFACE RADIATION BUDGET AT NY-ALESUND, SVALBARD AND SYOWA STATION, ANTARCTICA, 1987

The surface radiation budget in 1987 at Ny-Alesund, Svalbard was measured by the Norwegian Polar Institute, and is discussed as a typical radiative regime for the Arctic, at the edge of the seasonal sea ice area. Following the dramatic change of surface albedo between summer and winter, global solar...

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Main Authors: Takashi YAMANOUCHI, Jon Borre ORBAEK
Format: Report
Language:English
Published: National Institute of Polar Research 1995
Subjects:
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3884
http://id.nii.ac.jp/1291/00003884/
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spelling ftnipr:oai:nipr.repo.nii.ac.jp:00003884 2023-05-15T13:11:06+02:00 COMPARATIVE STUDY OF THE SURFACE RADIATION BUDGET AT NY-ALESUND, SVALBARD AND SYOWA STATION, ANTARCTICA, 1987 Takashi YAMANOUCHI Jon Borre ORBAEK 1995-09 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3884 http://id.nii.ac.jp/1291/00003884/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3884&item_no=1&attribute_id=18&file_no=1 en eng National Institute of Polar Research Norwegian Polar Institute https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3884 http://id.nii.ac.jp/1291/00003884/ AA10756213 Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 9, 118-132(1995-09) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3884&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1995 ftnipr 2022-12-24T19:48:15Z The surface radiation budget in 1987 at Ny-Alesund, Svalbard was measured by the Norwegian Polar Institute, and is discussed as a typical radiative regime for the Arctic, at the edge of the seasonal sea ice area. Following the dramatic change of surface albedo between summer and winter, global solar radiation decreases under clear and overcast conditions at the same solar zenith angle. The apparent transmittance defined as the ratio of the global radiation at the surface to the solar insolation at the top of the atmosphere ranges from 40 to 70% before the decrease of albedo; however, it ranges from 20 to 60% after the decrease of albedo. The downward longwave radiation differs considerably between winter and summer. In summer, the downward longwave radiation has a small range and the difference between clear and overcast is small, while cloud amount is very high. In winter, the range of downward longwave radiation is as great as 150W/m^2,from about 150W/m^2 under clear sky to more than 300W/m^2 under overcast sky in some cases. This great variation in winter is due not only to the variation of cloudiness but also to the variation of air mass surrounding Ny-Alesund. Larger downward longwave radiation with high cloudiness and warmer temperature accompany maritime airmasses; smaller radiation with low cloudiness and colder temerature accompany the Arctic airmass. Normally, polar clouds increase the downward longwave radiation and warm the surface; however, during the summer months when the surface snow cover disappears, clouds reduce the shortwave radiation more effectively than the increase of longwave radiation and the surface is cooled. Compared to the observations on the sea ice at Syowa Station, Antarctica, the net total radiation at Ny-Alesund is much larger in the summer months than at Syowa Station. These are the results of lower albedo in summer months, larger downward radiation due to warmer temperatures and clouds. As a whole, the radiation budget at Ny-Alesund in summer is controlled by the maritime ... Report albedo Antarc* Antarctica Arctic Norwegian Polar Institute Polar meteorology and glaciology Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology Sea ice Svalbard National Institute of Polar Research Repository, Japan Arctic Svalbard Syowa Station
institution Open Polar
collection National Institute of Polar Research Repository, Japan
op_collection_id ftnipr
language English
description The surface radiation budget in 1987 at Ny-Alesund, Svalbard was measured by the Norwegian Polar Institute, and is discussed as a typical radiative regime for the Arctic, at the edge of the seasonal sea ice area. Following the dramatic change of surface albedo between summer and winter, global solar radiation decreases under clear and overcast conditions at the same solar zenith angle. The apparent transmittance defined as the ratio of the global radiation at the surface to the solar insolation at the top of the atmosphere ranges from 40 to 70% before the decrease of albedo; however, it ranges from 20 to 60% after the decrease of albedo. The downward longwave radiation differs considerably between winter and summer. In summer, the downward longwave radiation has a small range and the difference between clear and overcast is small, while cloud amount is very high. In winter, the range of downward longwave radiation is as great as 150W/m^2,from about 150W/m^2 under clear sky to more than 300W/m^2 under overcast sky in some cases. This great variation in winter is due not only to the variation of cloudiness but also to the variation of air mass surrounding Ny-Alesund. Larger downward longwave radiation with high cloudiness and warmer temperature accompany maritime airmasses; smaller radiation with low cloudiness and colder temerature accompany the Arctic airmass. Normally, polar clouds increase the downward longwave radiation and warm the surface; however, during the summer months when the surface snow cover disappears, clouds reduce the shortwave radiation more effectively than the increase of longwave radiation and the surface is cooled. Compared to the observations on the sea ice at Syowa Station, Antarctica, the net total radiation at Ny-Alesund is much larger in the summer months than at Syowa Station. These are the results of lower albedo in summer months, larger downward radiation due to warmer temperatures and clouds. As a whole, the radiation budget at Ny-Alesund in summer is controlled by the maritime ...
format Report
author Takashi YAMANOUCHI
Jon Borre ORBAEK
spellingShingle Takashi YAMANOUCHI
Jon Borre ORBAEK
COMPARATIVE STUDY OF THE SURFACE RADIATION BUDGET AT NY-ALESUND, SVALBARD AND SYOWA STATION, ANTARCTICA, 1987
author_facet Takashi YAMANOUCHI
Jon Borre ORBAEK
author_sort Takashi YAMANOUCHI
title COMPARATIVE STUDY OF THE SURFACE RADIATION BUDGET AT NY-ALESUND, SVALBARD AND SYOWA STATION, ANTARCTICA, 1987
title_short COMPARATIVE STUDY OF THE SURFACE RADIATION BUDGET AT NY-ALESUND, SVALBARD AND SYOWA STATION, ANTARCTICA, 1987
title_full COMPARATIVE STUDY OF THE SURFACE RADIATION BUDGET AT NY-ALESUND, SVALBARD AND SYOWA STATION, ANTARCTICA, 1987
title_fullStr COMPARATIVE STUDY OF THE SURFACE RADIATION BUDGET AT NY-ALESUND, SVALBARD AND SYOWA STATION, ANTARCTICA, 1987
title_full_unstemmed COMPARATIVE STUDY OF THE SURFACE RADIATION BUDGET AT NY-ALESUND, SVALBARD AND SYOWA STATION, ANTARCTICA, 1987
title_sort comparative study of the surface radiation budget at ny-alesund, svalbard and syowa station, antarctica, 1987
publisher National Institute of Polar Research
publishDate 1995
url https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3884
http://id.nii.ac.jp/1291/00003884/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3884&item_no=1&attribute_id=18&file_no=1
geographic Arctic
Svalbard
Syowa Station
geographic_facet Arctic
Svalbard
Syowa Station
genre albedo
Antarc*
Antarctica
Arctic
Norwegian Polar Institute
Polar meteorology and glaciology
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
Sea ice
Svalbard
genre_facet albedo
Antarc*
Antarctica
Arctic
Norwegian Polar Institute
Polar meteorology and glaciology
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
Sea ice
Svalbard
op_relation https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3884
http://id.nii.ac.jp/1291/00003884/
AA10756213
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 9, 118-132(1995-09)
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3884&item_no=1&attribute_id=18&file_no=1
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