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    Understanding Radar Refractivity: Sources of Uncertainty

    Source: Journal of Applied Meteorology and Climatology:;2011:;volume( 050 ):;issue: 012::page 2543
    Author:
    Bodine, David
    ,
    Michaud, Dan
    ,
    Palmer, Robert D.
    ,
    Heinselman, Pamela L.
    ,
    Brotzge, Jerry
    ,
    Gasperoni, Nick
    ,
    Leng Cheong, Boon
    ,
    Xue, Ming
    ,
    Gao, Jidong
    DOI: 10.1175/2011JAMC2648.1
    Publisher: American Meteorological Society
    Abstract: his study presents a 2-yr-long comparison of Weather Surveillance Radar-1988 Doppler (WSR-88D) refractivity retrievals with Oklahoma Mesonetwork (?Mesonet?) and sounding measurements and discusses some challenges to implementing radar refractivity operationally. Temporal and spatial analyses of radar refractivity exhibit high correlation with Mesonet data; however, periods of large refractivity differences between the radar and Mesonet are observed. Several sources of refractivity differences are examined to determine the cause of large refractivity differences. One source for nonklystron radars includes magnetron frequency drift, which can introduce errors up to 10 N-units if the frequency drift is not corrected. Different reference maps made at different times can ?shift? refractivity values. A semiautomated method for producing reference maps is presented, including trade-offs for making reference maps under different conditions. Refractivity from six Mesonet stations within the clutter domain of the Oklahoma City, Oklahoma, WSR-88D (KTLX) is compared with radar refractivity retrievals. The analysis revealed that the six Mesonet stations exhibited a prominent diurnal trend in differences between radar and Mesonet refractivity measurements. The diurnal range of the refractivity differences sometimes exceeded 20 or 30 N-units in the warm season, which translated to a potential dewpoint temperature difference of several degrees Celsius. A seasonal analysis revealed that large refractivity differences primarily occurred during the warm season when refractivity is most sensitive to moisture. Ultimately, the main factor in determining the magnitude of the differences between the two refractivity platforms is the vertical gradient of refractivity because of the difference in observation height between the radar and a surface station.
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      Understanding Radar Refractivity: Sources of Uncertainty

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4213569
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    • Journal of Applied Meteorology and Climatology

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    contributor authorBodine, David
    contributor authorMichaud, Dan
    contributor authorPalmer, Robert D.
    contributor authorHeinselman, Pamela L.
    contributor authorBrotzge, Jerry
    contributor authorGasperoni, Nick
    contributor authorLeng Cheong, Boon
    contributor authorXue, Ming
    contributor authorGao, Jidong
    date accessioned2017-06-09T16:39:18Z
    date available2017-06-09T16:39:18Z
    date copyright2011/12/01
    date issued2011
    identifier issn1558-8424
    identifier otherams-71653.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4213569
    description abstracthis study presents a 2-yr-long comparison of Weather Surveillance Radar-1988 Doppler (WSR-88D) refractivity retrievals with Oklahoma Mesonetwork (?Mesonet?) and sounding measurements and discusses some challenges to implementing radar refractivity operationally. Temporal and spatial analyses of radar refractivity exhibit high correlation with Mesonet data; however, periods of large refractivity differences between the radar and Mesonet are observed. Several sources of refractivity differences are examined to determine the cause of large refractivity differences. One source for nonklystron radars includes magnetron frequency drift, which can introduce errors up to 10 N-units if the frequency drift is not corrected. Different reference maps made at different times can ?shift? refractivity values. A semiautomated method for producing reference maps is presented, including trade-offs for making reference maps under different conditions. Refractivity from six Mesonet stations within the clutter domain of the Oklahoma City, Oklahoma, WSR-88D (KTLX) is compared with radar refractivity retrievals. The analysis revealed that the six Mesonet stations exhibited a prominent diurnal trend in differences between radar and Mesonet refractivity measurements. The diurnal range of the refractivity differences sometimes exceeded 20 or 30 N-units in the warm season, which translated to a potential dewpoint temperature difference of several degrees Celsius. A seasonal analysis revealed that large refractivity differences primarily occurred during the warm season when refractivity is most sensitive to moisture. Ultimately, the main factor in determining the magnitude of the differences between the two refractivity platforms is the vertical gradient of refractivity because of the difference in observation height between the radar and a surface station.
    publisherAmerican Meteorological Society
    titleUnderstanding Radar Refractivity: Sources of Uncertainty
    typeJournal Paper
    journal volume50
    journal issue12
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/2011JAMC2648.1
    journal fristpage2543
    journal lastpage2560
    treeJournal of Applied Meteorology and Climatology:;2011:;volume( 050 ):;issue: 012
    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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