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    Assessing and Improving the Quality of Unattended Radiation Observations in Antarctica

    Source: Journal of Atmospheric and Oceanic Technology:;2004:;volume( 021 ):;issue: 009::page 1417
    Author:
    van den Broeke, Michiel
    ,
    van As, Dirk
    ,
    Reijmer, Carleen
    ,
    van de Wal, Roderik
    DOI: 10.1175/1520-0426(2004)021<1417:AAITQO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The quality of atmospheric radiation measurements made at automatic weather stations (AWSs) in Antarctica is assessed. The AWSs are placed on the coastal ice shelf in the katabatic wind zone and on the high Antarctic plateau, and they measure shortwave and longwave radiation fluxes using unheated/unventilated Kipp and Zonen (KZ) CM3/CG3 sensors. During three summertime Antarctic experiments, the AWS sensors were directly compared to instruments of a higher standard, the KZ CM11 for shortwave and Eppley PIR for longwave radiation. It was found that the single-domed KZ CM3 is less sensitive to riming than the double-domed KZ CM11. With an accuracy better than 5% for daily averages, the KZ CM3 and CG3 perform better than their specifications. Net shortwave radiation calculated from individual pairs of incoming and reflected fluxes shows large relative errors, and a method is presented to remedy this. Summertime longwave fluxes measured with the KZ CG3 show very good agreement with ventilated Eppley PIR measurements [root-mean-square difference (rmsd) about 1%], but a larger systematic difference is found when comparison is made with unventilated Eppley PIR measurements. Upward extrapolation of snow temperatures suggest that the unventilated Eppley PIR measurements have a systematic offset, but additional measurements are necessary to confirm this. Wintertime riming of the unventilated/unheated KZ CG3 sensor window leads to rejection of 25%?28% of the LW? data for the AWS on the ice shelf and the plateau. Replacing these data with parameterized values removes the systematic offset but introduces an uncertainty of 10%?15%.
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      Assessing and Improving the Quality of Unattended Radiation Observations in Antarctica

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4160190
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    • Journal of Atmospheric and Oceanic Technology

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    contributor authorvan den Broeke, Michiel
    contributor authorvan As, Dirk
    contributor authorReijmer, Carleen
    contributor authorvan de Wal, Roderik
    date accessioned2017-06-09T14:39:03Z
    date available2017-06-09T14:39:03Z
    date copyright2004/09/01
    date issued2004
    identifier issn0739-0572
    identifier otherams-2361.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4160190
    description abstractThe quality of atmospheric radiation measurements made at automatic weather stations (AWSs) in Antarctica is assessed. The AWSs are placed on the coastal ice shelf in the katabatic wind zone and on the high Antarctic plateau, and they measure shortwave and longwave radiation fluxes using unheated/unventilated Kipp and Zonen (KZ) CM3/CG3 sensors. During three summertime Antarctic experiments, the AWS sensors were directly compared to instruments of a higher standard, the KZ CM11 for shortwave and Eppley PIR for longwave radiation. It was found that the single-domed KZ CM3 is less sensitive to riming than the double-domed KZ CM11. With an accuracy better than 5% for daily averages, the KZ CM3 and CG3 perform better than their specifications. Net shortwave radiation calculated from individual pairs of incoming and reflected fluxes shows large relative errors, and a method is presented to remedy this. Summertime longwave fluxes measured with the KZ CG3 show very good agreement with ventilated Eppley PIR measurements [root-mean-square difference (rmsd) about 1%], but a larger systematic difference is found when comparison is made with unventilated Eppley PIR measurements. Upward extrapolation of snow temperatures suggest that the unventilated Eppley PIR measurements have a systematic offset, but additional measurements are necessary to confirm this. Wintertime riming of the unventilated/unheated KZ CG3 sensor window leads to rejection of 25%?28% of the LW? data for the AWS on the ice shelf and the plateau. Replacing these data with parameterized values removes the systematic offset but introduces an uncertainty of 10%?15%.
    publisherAmerican Meteorological Society
    titleAssessing and Improving the Quality of Unattended Radiation Observations in Antarctica
    typeJournal Paper
    journal volume21
    journal issue9
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/1520-0426(2004)021<1417:AAITQO>2.0.CO;2
    journal fristpage1417
    journal lastpage1431
    treeJournal of Atmospheric and Oceanic Technology:;2004:;volume( 021 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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