Variations in Cloudiness, Temperature and Satellite-Derived Outgoing Longwave Radiation for Alaska
Monthly values of outgoing longwave radiation (OLR) from 1974 to 1990 were obtained from NOAA satellites. Seasonal variations in the OLR were related to cloudiness and surface temperature data for Alaska. It was found that higher amounts of cloudiness increase the OLR in winter for most of Alaska, b...
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ftdtic:ADP007293 2023-05-15T15:14:38+02:00 Variations in Cloudiness, Temperature and Satellite-Derived Outgoing Longwave Radiation for Alaska Wendler, Gerd ALASKA UNIV FAIRBANKS GEOPHYSICAL INST 1992-03 text/html http://www.dtic.mil/docs/citations/ADP007293 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007293 en eng http://www.dtic.mil/docs/citations/ADP007293 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Meteorology Atmospheric Physics *CLOUDS *GREENHOUSE EFFECT *SOLAR RADIATION ALASKA BALANCE BARTER ISLAND RADIATION SEASONAL VARIATIONS SENSITIVITY SURFACE TEMPERATURE TEMPERATURE INVERSION VARIATIONS ENVIRONMENTAL IMPACT *Global climate change Component Reports Outgoing longwave radiation Text 1992 ftdtic 2016-02-19T17:39:24Z Monthly values of outgoing longwave radiation (OLR) from 1974 to 1990 were obtained from NOAA satellites. Seasonal variations in the OLR were related to cloudiness and surface temperature data for Alaska. It was found that higher amounts of cloudiness increase the OLR in winter for most of Alaska, but decrease it in summer. For one particular location, Barter Island, trends in cloudiness, temperature, and OLR will be discussed and the seasonal sensitivity of OLR to changes in cloud amount will be examined. For Barter Island, a decrease of less than 7% in the amount of cloudiness was found to decrease the OLR by 5 W m-2 during the spring months, a season in which cloudiness and OLR are positively correlated. During the summer, however, OLR and cloudiness are anti-correlated owing to the relatively cold radiative temperatures at cloud-top height compared to the surface temperature in the absence of strong surface temperature inversions, which persist for most of the rest of the year. Hence relatively small changes in the amount of cloudiness may have a large effect on the radiation balance in the Arctic, even more so than changes expected due to increasing concentration of C02 and other radiatively active gases. As parameterization of sky cover in GCMs is not well advanced, studies like this should help in a better quantitative understanding of sky cover and OLR. 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 1990. Volume 1', AD-A253 027, p231-235. See also Volume 2, AD-A253 028. Text Arctic Barter Island Climate change Alaska Defense Technical Information Center: DTIC Technical Reports database Arctic Fairbanks |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Meteorology Atmospheric Physics *CLOUDS *GREENHOUSE EFFECT *SOLAR RADIATION ALASKA BALANCE BARTER ISLAND RADIATION SEASONAL VARIATIONS SENSITIVITY SURFACE TEMPERATURE TEMPERATURE INVERSION VARIATIONS ENVIRONMENTAL IMPACT *Global climate change Component Reports Outgoing longwave radiation |
spellingShingle |
Meteorology Atmospheric Physics *CLOUDS *GREENHOUSE EFFECT *SOLAR RADIATION ALASKA BALANCE BARTER ISLAND RADIATION SEASONAL VARIATIONS SENSITIVITY SURFACE TEMPERATURE TEMPERATURE INVERSION VARIATIONS ENVIRONMENTAL IMPACT *Global climate change Component Reports Outgoing longwave radiation Wendler, Gerd Variations in Cloudiness, Temperature and Satellite-Derived Outgoing Longwave Radiation for Alaska |
topic_facet |
Meteorology Atmospheric Physics *CLOUDS *GREENHOUSE EFFECT *SOLAR RADIATION ALASKA BALANCE BARTER ISLAND RADIATION SEASONAL VARIATIONS SENSITIVITY SURFACE TEMPERATURE TEMPERATURE INVERSION VARIATIONS ENVIRONMENTAL IMPACT *Global climate change Component Reports Outgoing longwave radiation |
description |
Monthly values of outgoing longwave radiation (OLR) from 1974 to 1990 were obtained from NOAA satellites. Seasonal variations in the OLR were related to cloudiness and surface temperature data for Alaska. It was found that higher amounts of cloudiness increase the OLR in winter for most of Alaska, but decrease it in summer. For one particular location, Barter Island, trends in cloudiness, temperature, and OLR will be discussed and the seasonal sensitivity of OLR to changes in cloud amount will be examined. For Barter Island, a decrease of less than 7% in the amount of cloudiness was found to decrease the OLR by 5 W m-2 during the spring months, a season in which cloudiness and OLR are positively correlated. During the summer, however, OLR and cloudiness are anti-correlated owing to the relatively cold radiative temperatures at cloud-top height compared to the surface temperature in the absence of strong surface temperature inversions, which persist for most of the rest of the year. Hence relatively small changes in the amount of cloudiness may have a large effect on the radiation balance in the Arctic, even more so than changes expected due to increasing concentration of C02 and other radiatively active gases. As parameterization of sky cover in GCMs is not well advanced, studies like this should help in a better quantitative understanding of sky cover and OLR. 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 1990. Volume 1', AD-A253 027, p231-235. See also Volume 2, AD-A253 028. |
author2 |
ALASKA UNIV FAIRBANKS GEOPHYSICAL INST |
format |
Text |
author |
Wendler, Gerd |
author_facet |
Wendler, Gerd |
author_sort |
Wendler, Gerd |
title |
Variations in Cloudiness, Temperature and Satellite-Derived Outgoing Longwave Radiation for Alaska |
title_short |
Variations in Cloudiness, Temperature and Satellite-Derived Outgoing Longwave Radiation for Alaska |
title_full |
Variations in Cloudiness, Temperature and Satellite-Derived Outgoing Longwave Radiation for Alaska |
title_fullStr |
Variations in Cloudiness, Temperature and Satellite-Derived Outgoing Longwave Radiation for Alaska |
title_full_unstemmed |
Variations in Cloudiness, Temperature and Satellite-Derived Outgoing Longwave Radiation for Alaska |
title_sort |
variations in cloudiness, temperature and satellite-derived outgoing longwave radiation for alaska |
publishDate |
1992 |
url |
http://www.dtic.mil/docs/citations/ADP007293 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007293 |
geographic |
Arctic Fairbanks |
geographic_facet |
Arctic Fairbanks |
genre |
Arctic Barter Island Climate change Alaska |
genre_facet |
Arctic Barter Island Climate change Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADP007293 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766345065157885952 |