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    Variability and Trends in Antarctic Surface Temperatures from In Situ and Satellite Infrared Measurements

    Source: Journal of Climate:;2000:;volume( 013 ):;issue: 010::page 1674
    Author:
    Comiso, Josefino C.
    DOI: 10.1175/1520-0442(2000)013<1674:VATIAS>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The surface air temperatures observed from stations in Antarctica have been shown to have predominantly positive trends that are as high as 0.5°C decade?1 along the Antarctic Peninsula. To evaluate whether the trends are caused by a local or large-scale phenomenon in the Antarctic region, surface temperatures inferred from infrared satellite data from 1979 to 1998 have been analyzed in combination with data from 21 stations that have long record lengths. The surface temperatures derived from infrared data are coherent spatially and temporally and are shown to agree well with Antarctic station data with a correlation coefficient of 0.98 and a standard deviation of about 3°C. The trend analysis on station data yielded on the average 0.012 ± 0.008°C yr?1 and ?0.008 ± 0.025°C yr?1 for the 45- and 20-yr record, respectively. The latter reasonably agrees with the trend of ?0.042 ± 0.067°C yr?1 inferred from the satellite 20-yr record. The 20-yr record length is shown to be about the minimum length required for a meaningful trend analysis study. However, interannual fluctuations of the temperatures are large and the 95% confidence level for the satellite trends ranges from ?0.177 to 0.094°C yr?1 for the Antarctic ice sheet. Nevertheless, the observed cooling is intriguing, especially since it is compatible with the observed trend in the sea ice cover. In the sea ice regions, the northernmost positions of the ice edge are shown to be influenced by alternating warm and cold anomalies around the continent. The pattern of these anomalies is consistent with that of the Antarctic circumpolar wave but with predominantly mode-3 instead of mode-2 wave as reported previously.
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      Variability and Trends in Antarctic Surface Temperatures from In Situ and Satellite Infrared Measurements

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4194623
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    contributor authorComiso, Josefino C.
    date accessioned2017-06-09T15:49:54Z
    date available2017-06-09T15:49:54Z
    date copyright2000/05/01
    date issued2000
    identifier issn0894-8755
    identifier otherams-5460.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4194623
    description abstractThe surface air temperatures observed from stations in Antarctica have been shown to have predominantly positive trends that are as high as 0.5°C decade?1 along the Antarctic Peninsula. To evaluate whether the trends are caused by a local or large-scale phenomenon in the Antarctic region, surface temperatures inferred from infrared satellite data from 1979 to 1998 have been analyzed in combination with data from 21 stations that have long record lengths. The surface temperatures derived from infrared data are coherent spatially and temporally and are shown to agree well with Antarctic station data with a correlation coefficient of 0.98 and a standard deviation of about 3°C. The trend analysis on station data yielded on the average 0.012 ± 0.008°C yr?1 and ?0.008 ± 0.025°C yr?1 for the 45- and 20-yr record, respectively. The latter reasonably agrees with the trend of ?0.042 ± 0.067°C yr?1 inferred from the satellite 20-yr record. The 20-yr record length is shown to be about the minimum length required for a meaningful trend analysis study. However, interannual fluctuations of the temperatures are large and the 95% confidence level for the satellite trends ranges from ?0.177 to 0.094°C yr?1 for the Antarctic ice sheet. Nevertheless, the observed cooling is intriguing, especially since it is compatible with the observed trend in the sea ice cover. In the sea ice regions, the northernmost positions of the ice edge are shown to be influenced by alternating warm and cold anomalies around the continent. The pattern of these anomalies is consistent with that of the Antarctic circumpolar wave but with predominantly mode-3 instead of mode-2 wave as reported previously.
    publisherAmerican Meteorological Society
    titleVariability and Trends in Antarctic Surface Temperatures from In Situ and Satellite Infrared Measurements
    typeJournal Paper
    journal volume13
    journal issue10
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2000)013<1674:VATIAS>2.0.CO;2
    journal fristpage1674
    journal lastpage1696
    treeJournal of Climate:;2000:;volume( 013 ):;issue: 010
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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