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subseasonal Zonal Oscillation of Western Pacific Subtropical High during Early Summer

Subseasonal Zonal Oscillation of Western Pacific Subtropical...

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第35届中国气象学会年会

作者： REN Xuejuan GUAN Weina SHANG Wei HU Haibo School of Atmospheric Sciences Nanjing University

This study examines the features and dynamical processes of subseasonal zonal oscillation of the western Pacific subtropical high(WPSH)during early summer,by performing a multivariate empirical orthogonal function(MV-EOF)analysis on daily winds and a diagnosis on potential vorticity(PV)at 500 h Pa for the period *** first MV-EOF mode is characterized by an anticyclonic anomaly occupying southeastern China-subtropical western North Pacific *** has a period of 10–25 days and represents zonal shift of the *** the WPSH stretches more westward,the South Asian high(SAH)extends more *** above-normal precipitation is observed over the Yangtze-Huaihe River(YHR)basin.A suppressed convection with an anomalous descending motion is located over the subtropical western North Pacific(Fig.1).The relative zonal movement of the SAH and the WPSH contributes to establish an anomalously local vertical circulation of ascending motion with upper level divergence over the YHR basin,and descending motion with upper level convergence over the subtropical western *** local vertical circulation provides a dynamic condition for persistent rainfall over the YHR *** enhanced southwest flow over the WPSH's western edge transports more moisture to eastern China,providing a necessary vapor condition for the persistent rainfall over the YHR basin.A potential vorticity diagnosis reveals that anomalous diabatic heating is a main source of PV *** anomalous cooling over the subtropical western Pacific produces a locally negative PV center at 500 h *** anomalous heating over the YHR basin generates a locally positive PV *** above south-north dipolar structure of PV anomaly along with the climatological southerly flow leads to northward advection of negative *** two processes are conducive to the WPSH's westward *** vertical advection process is unfavorable to the westward extension but contributes to the eastward retreat of

关键词： western Pacific subtropical high subseasonal time-scale diabatic heating potential vorticity

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