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    Performance of the Precipitation Occurrence Sensor System as a Precipitation Gauge

    Source: Journal of Atmospheric and Oceanic Technology:;2008:;volume( 025 ):;issue: 002::page 196
    Author:
    Sheppard, B. E.
    ,
    Joe, P. I.
    DOI: 10.1175/2007JTECHA957.1
    Publisher: American Meteorological Society
    Abstract: The Precipitation Occurrence Sensor System (POSS) is a small X-band Doppler radar originally developed by the Meteorological Service of Canada for reporting the occurrence, type, and intensity of precipitation from Automated Weather Observing Stations. This study evaluates POSS as a gauge for measuring amounts of both liquid and solid precipitation. Different precipitation rate estimation algorithms are described. The effect of different solid precipitation types on the Doppler velocity spectrum is discussed. Lacking any accepted reference for high temporal resolution rates, the POSS precipitation rate measurements are integrated over time periods ranging from 6 h to one day and validated against international and Canadian reference gauges. Data from a wide range of sites across Canada and for periods of several years are used. The statistical performance of POSS is described in terms of the distribution of ratios of POSS to reference gauge amounts (catch ratios). In liquid precipitation the median of the catch ratio distribution is 82% and the interquartile range was between ?12% and 19% about the median. In solid precipitation the median is 90% and the interquartile range is between ?17% and 24% about the median. The underestimation in both liquid and solid precipitation is shown to be a function of precipitation rate and phase. The effects of radome wetting, raindrop splashing, wind, and the radar ?brightband? effect on the estimation of precipitation rates are discussed.
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      Performance of the Precipitation Occurrence Sensor System as a Precipitation Gauge

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    contributor authorSheppard, B. E.
    contributor authorJoe, P. I.
    date accessioned2017-06-09T16:20:37Z
    date available2017-06-09T16:20:37Z
    date copyright2008/02/01
    date issued2008
    identifier issn0739-0572
    identifier otherams-66131.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4207433
    description abstractThe Precipitation Occurrence Sensor System (POSS) is a small X-band Doppler radar originally developed by the Meteorological Service of Canada for reporting the occurrence, type, and intensity of precipitation from Automated Weather Observing Stations. This study evaluates POSS as a gauge for measuring amounts of both liquid and solid precipitation. Different precipitation rate estimation algorithms are described. The effect of different solid precipitation types on the Doppler velocity spectrum is discussed. Lacking any accepted reference for high temporal resolution rates, the POSS precipitation rate measurements are integrated over time periods ranging from 6 h to one day and validated against international and Canadian reference gauges. Data from a wide range of sites across Canada and for periods of several years are used. The statistical performance of POSS is described in terms of the distribution of ratios of POSS to reference gauge amounts (catch ratios). In liquid precipitation the median of the catch ratio distribution is 82% and the interquartile range was between ?12% and 19% about the median. In solid precipitation the median is 90% and the interquartile range is between ?17% and 24% about the median. The underestimation in both liquid and solid precipitation is shown to be a function of precipitation rate and phase. The effects of radome wetting, raindrop splashing, wind, and the radar ?brightband? effect on the estimation of precipitation rates are discussed.
    publisherAmerican Meteorological Society
    titlePerformance of the Precipitation Occurrence Sensor System as a Precipitation Gauge
    typeJournal Paper
    journal volume25
    journal issue2
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/2007JTECHA957.1
    journal fristpage196
    journal lastpage212
    treeJournal of Atmospheric and Oceanic Technology:;2008:;volume( 025 ):;issue: 002
    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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