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    Validation of Clear-Sky Fluxes for Tropical Oceans from the Earth Radiation Budget Experiment

    Source: Journal of Climate:;1995:;volume( 008 ):;issue: 003::page 569
    Author:
    Collins, W. D.
    ,
    Inamdar, A. K.
    DOI: 10.1175/1520-0442(1995)008<0569:VOCSFF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The existence and magnitude of a systematic bias in the clear-sky longwave fluxes from the Earth Radiation Budget Experiment (ERBE) is investigated. The bias is apparently introduced because the ERBE method for scene identification does not account for large zonal gradients in longwave absorption by water vapor. The ERBE fluxes are compared to fluxes calculated with a radiative transfer model from ship radiosonde measurements. The comparison is based upon an analysis of 5 yr of coincident satellite and radiosonde observations for equatorial ocean regions. The differences between the ERBE and model fluxes are examined as functions of sea surface temperature (SST) and relative humidity. The authors use height-mean relative humidity R?H? as an index of atmospheric moisture. The average offset between the model and ERBE fluxes ranges between +2 and +6 W m?2 for SSTs above 295 K, and the gradients with respect to SST are nearly identical. However, the difference between the model and ERBE depends significantly on the tropospheric relative humidity. ERBE fluxes exceed model fluxes for R?Hmacr; above 70%, and the maximum offset of +9 to +12 W m?2 is consistent with previous estimates. There are also indications that the clear-sky fluxes for R?Hmacr; below 25% may be underestimated by about 10?15 W m?2. Since extreme values of height-mean humidity are relatively infrequent, the net bias introduced in the ERBE monthly mean clear-sky fluxes is generally less than the systematic error in estimates of the instantaneous fluxes. These findings support earlier work on the coupling between, SST and the atmospheric greenhouse effect, in particular the existence of a super greenhouse effect for oceans warmer than 300 K. Recent reports of much larger systematic differences are not supported by this analysis. The results indicate that comparison of GCM and ERBE clear-sky longwave fluxes will depend explicitly on atmospheric humidity.
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      Validation of Clear-Sky Fluxes for Tropical Oceans from the Earth Radiation Budget Experiment

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4181834
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    contributor authorCollins, W. D.
    contributor authorInamdar, A. K.
    date accessioned2017-06-09T15:24:58Z
    date available2017-06-09T15:24:58Z
    date copyright1995/03/01
    date issued1995
    identifier issn0894-8755
    identifier otherams-4309.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4181834
    description abstractThe existence and magnitude of a systematic bias in the clear-sky longwave fluxes from the Earth Radiation Budget Experiment (ERBE) is investigated. The bias is apparently introduced because the ERBE method for scene identification does not account for large zonal gradients in longwave absorption by water vapor. The ERBE fluxes are compared to fluxes calculated with a radiative transfer model from ship radiosonde measurements. The comparison is based upon an analysis of 5 yr of coincident satellite and radiosonde observations for equatorial ocean regions. The differences between the ERBE and model fluxes are examined as functions of sea surface temperature (SST) and relative humidity. The authors use height-mean relative humidity R?H? as an index of atmospheric moisture. The average offset between the model and ERBE fluxes ranges between +2 and +6 W m?2 for SSTs above 295 K, and the gradients with respect to SST are nearly identical. However, the difference between the model and ERBE depends significantly on the tropospheric relative humidity. ERBE fluxes exceed model fluxes for R?Hmacr; above 70%, and the maximum offset of +9 to +12 W m?2 is consistent with previous estimates. There are also indications that the clear-sky fluxes for R?Hmacr; below 25% may be underestimated by about 10?15 W m?2. Since extreme values of height-mean humidity are relatively infrequent, the net bias introduced in the ERBE monthly mean clear-sky fluxes is generally less than the systematic error in estimates of the instantaneous fluxes. These findings support earlier work on the coupling between, SST and the atmospheric greenhouse effect, in particular the existence of a super greenhouse effect for oceans warmer than 300 K. Recent reports of much larger systematic differences are not supported by this analysis. The results indicate that comparison of GCM and ERBE clear-sky longwave fluxes will depend explicitly on atmospheric humidity.
    publisherAmerican Meteorological Society
    titleValidation of Clear-Sky Fluxes for Tropical Oceans from the Earth Radiation Budget Experiment
    typeJournal Paper
    journal volume8
    journal issue3
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(1995)008<0569:VOCSFF>2.0.CO;2
    journal fristpage569
    journal lastpage578
    treeJournal of Climate:;1995:;volume( 008 ):;issue: 003
    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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