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    Characteristics and Mechanisms of the Subseasonal Eastward Extension of the South Asian High

    Source: Journal of Climate:;2015:;volume( 028 ):;issue: 017::page 6799
    Author:
    Ren, Xuejuan
    ,
    Yang, Dejian
    ,
    Yang, Xiu-Qun
    DOI: 10.1175/JCLI-D-14-00682.1
    Publisher: American Meteorological Society
    Abstract: his study investigates the features of eastward extension of the South Asian high (SAH) and its connection with diabatic heating and rainfall over eastern Asia on subseasonal time scales. The causes of SAH?s eastward extension are examined by potential vorticity (PV) diagnosis with emphasis on the joint role of diabatic heating feedback and midlatitude wave train. The SAH?s eastward extension features eastward propagation of a wave train across Eurasia. Among the wave train, the migration of weak high from the western flank of the Tibetan Plateau (TP) to the east of TP contributes to the SAH?s eastward extension at the early stage. When the SAH approaches its easternmost position, a strong negative PV (positive geopotential height) center prevails to the east of the TP at 200 hPa. The associated anomalies in diabatic heating and rainfall include the anomalous heating and above-normal rainfall over the South China Sea (SCS) and subtropical western Pacific occurring 12 days before the SAH?s easternmost stretch, and then anomalous cooling and below-normal rainfall over the southern foot of the TP and southern China and heating and above-normal rainfall over the northern TP and northern China a week later. The anomalous heating and ascending motion over the northern TP and northern China act to increase negative PV locally at 200 hPa. The cooling and descending induce positive PV over southern China. The north?south dipolar structure of PV anomaly with the climatological northerly flow is favorable to southward advection of a negative PV anomaly at 200 hPa. The anomalous heating over the SCS?western Pacific helps to develop a below-normal rainfall condition over southern China via inducing a lower-level anomalous cyclone over coastal region. These processes are conducive to the SAH?s eastward extension at its later stage.
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      Characteristics and Mechanisms of the Subseasonal Eastward Extension of the South Asian High

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4223777
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    • Journal of Climate

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    contributor authorRen, Xuejuan
    contributor authorYang, Dejian
    contributor authorYang, Xiu-Qun
    date accessioned2017-06-09T17:11:28Z
    date available2017-06-09T17:11:28Z
    date copyright2015/09/01
    date issued2015
    identifier issn0894-8755
    identifier otherams-80841.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223777
    description abstracthis study investigates the features of eastward extension of the South Asian high (SAH) and its connection with diabatic heating and rainfall over eastern Asia on subseasonal time scales. The causes of SAH?s eastward extension are examined by potential vorticity (PV) diagnosis with emphasis on the joint role of diabatic heating feedback and midlatitude wave train. The SAH?s eastward extension features eastward propagation of a wave train across Eurasia. Among the wave train, the migration of weak high from the western flank of the Tibetan Plateau (TP) to the east of TP contributes to the SAH?s eastward extension at the early stage. When the SAH approaches its easternmost position, a strong negative PV (positive geopotential height) center prevails to the east of the TP at 200 hPa. The associated anomalies in diabatic heating and rainfall include the anomalous heating and above-normal rainfall over the South China Sea (SCS) and subtropical western Pacific occurring 12 days before the SAH?s easternmost stretch, and then anomalous cooling and below-normal rainfall over the southern foot of the TP and southern China and heating and above-normal rainfall over the northern TP and northern China a week later. The anomalous heating and ascending motion over the northern TP and northern China act to increase negative PV locally at 200 hPa. The cooling and descending induce positive PV over southern China. The north?south dipolar structure of PV anomaly with the climatological northerly flow is favorable to southward advection of a negative PV anomaly at 200 hPa. The anomalous heating over the SCS?western Pacific helps to develop a below-normal rainfall condition over southern China via inducing a lower-level anomalous cyclone over coastal region. These processes are conducive to the SAH?s eastward extension at its later stage.
    publisherAmerican Meteorological Society
    titleCharacteristics and Mechanisms of the Subseasonal Eastward Extension of the South Asian High
    typeJournal Paper
    journal volume28
    journal issue17
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-14-00682.1
    journal fristpage6799
    journal lastpage6822
    treeJournal of Climate:;2015:;volume( 028 ):;issue: 017
    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
    yabeshDSpacePersian