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    Comparison of GPCP Monthly and Daily Precipitation Estimates with High-Latitude Gauge Observations

    Source: Journal of Applied Meteorology and Climatology:;2009:;volume( 048 ):;issue: 009::page 1843
    Author:
    Bolvin, David T.
    ,
    Adler, Robert F.
    ,
    Huffman, George J.
    ,
    Nelkin, Eric J.
    ,
    Poutiainen, Jani P.
    DOI: 10.1175/2009JAMC2147.1
    Publisher: American Meteorological Society
    Abstract: Monthly and daily products of the Global Precipitation Climatology Project (GPCP) are evaluated through a comparison with Finnish Meteorological Institute (FMI) gauge observations for the period January 1995?December 2007 to assess the quality of the GPCP estimates at high latitudes. At the monthly scale both the final GPCP combination satellite?gauge (SG) product is evaluated, along with the satellite-only multisatellite (MS) product. The GPCP daily product is scaled to sum to the monthly product, so it implicitly contains monthly-scale gauge influence, although it contains no daily gauge information. As expected, the monthly SG product agrees well with the FMI observations because of the inclusion of limited gauge information. Over the entire analysis period the SG estimates are biased low by 6% when the same wind-loss adjustment is applied to the FMI gauges as is used in the SG analysis. The interannual anomaly correlation is about 0.9. The satellite-only MS product has a lesser, but still reasonably good, interannual correlation (?0.6) while retaining a similar bias due to the use of a climatological bias adjustment. These results indicate the value of using even a few gauges in the analysis and provide an estimate of the correlation error to be expected in the SG analysis over ocean and remote land areas where gauges are absent. The daily GPCP precipitation estimates compare reasonably well at the 1° latitude ? 2° longitude scale with the FMI gauge observations in the summer with a correlation of 0.55, but less so in the winter with a correlation of 0.45. Correlations increase somewhat when larger areas and multiday periods are analyzed. The day-to-day occurrence of precipitation is captured fairly well by the GPCP estimates, but the corresponding precipitation event amounts tend to show wide variability. The results of this study indicate that the GPCP monthly and daily fields are useful for meteorological and hydrological studies but that there is significant room for improvement of satellite retrievals and analysis techniques in this region. It is hoped that the research here provides a framework for future high-latitude assessment efforts such as those that will be necessary for the upcoming satellite-based Global Precipitation Measurement (GPM) mission.
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      Comparison of GPCP Monthly and Daily Precipitation Estimates with High-Latitude Gauge Observations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4209850
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    contributor authorBolvin, David T.
    contributor authorAdler, Robert F.
    contributor authorHuffman, George J.
    contributor authorNelkin, Eric J.
    contributor authorPoutiainen, Jani P.
    date accessioned2017-06-09T16:27:48Z
    date available2017-06-09T16:27:48Z
    date copyright2009/09/01
    date issued2009
    identifier issn1558-8424
    identifier otherams-68306.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4209850
    description abstractMonthly and daily products of the Global Precipitation Climatology Project (GPCP) are evaluated through a comparison with Finnish Meteorological Institute (FMI) gauge observations for the period January 1995?December 2007 to assess the quality of the GPCP estimates at high latitudes. At the monthly scale both the final GPCP combination satellite?gauge (SG) product is evaluated, along with the satellite-only multisatellite (MS) product. The GPCP daily product is scaled to sum to the monthly product, so it implicitly contains monthly-scale gauge influence, although it contains no daily gauge information. As expected, the monthly SG product agrees well with the FMI observations because of the inclusion of limited gauge information. Over the entire analysis period the SG estimates are biased low by 6% when the same wind-loss adjustment is applied to the FMI gauges as is used in the SG analysis. The interannual anomaly correlation is about 0.9. The satellite-only MS product has a lesser, but still reasonably good, interannual correlation (?0.6) while retaining a similar bias due to the use of a climatological bias adjustment. These results indicate the value of using even a few gauges in the analysis and provide an estimate of the correlation error to be expected in the SG analysis over ocean and remote land areas where gauges are absent. The daily GPCP precipitation estimates compare reasonably well at the 1° latitude ? 2° longitude scale with the FMI gauge observations in the summer with a correlation of 0.55, but less so in the winter with a correlation of 0.45. Correlations increase somewhat when larger areas and multiday periods are analyzed. The day-to-day occurrence of precipitation is captured fairly well by the GPCP estimates, but the corresponding precipitation event amounts tend to show wide variability. The results of this study indicate that the GPCP monthly and daily fields are useful for meteorological and hydrological studies but that there is significant room for improvement of satellite retrievals and analysis techniques in this region. It is hoped that the research here provides a framework for future high-latitude assessment efforts such as those that will be necessary for the upcoming satellite-based Global Precipitation Measurement (GPM) mission.
    publisherAmerican Meteorological Society
    titleComparison of GPCP Monthly and Daily Precipitation Estimates with High-Latitude Gauge Observations
    typeJournal Paper
    journal volume48
    journal issue9
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/2009JAMC2147.1
    journal fristpage1843
    journal lastpage1857
    treeJournal of Applied Meteorology and Climatology:;2009:;volume( 048 ):;issue: 009
    contenttypeFulltext
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