In terms of NCEP/NCAR daily reanalysis data and some remote sensing data, effects of diabatic heating on the
short-term position variation of the west Pacific subtropical high (WPSH) during persistent heavy rain event in June
2005 in South China are analyzed based on the complete vertical vorticity equation. The results show that the position
variation of WPSH is associated with the diabatic heating. In comparison with the climatology, there is strong heating on
the north side of WPSH and relatively weak ITCZ convection on the south.. Each of westward extension of WPSH
corresponds to a significantly enhanced heating to the west of WPSH. In mid-troposphere, the vertical variation of
heating on the north (south) of WPSH during 12~24 June, 2005 is basically greater(less) than the climatology, which is
unfavorable for the northward movement of WPSH. In the mid and late of June 2005, the vertical variation of heating
over the eastern coast of the Arabian Sea and the Bay of Bengal (to the west of WPSH) is largely higher than the
climatology, which is in favor of the increase of anti-cyclonic vorticity on the west of WPSH, inducing westward
extension of WPSH. As a result, the heating on the north and south, and to the west of WPSH work together to make
WPSH extend more southward and westward in June 2005, which is in favorable for rainbelts maintaining in South
China.
KEYWORDS: Composites, Data centers, Convection, Remote sensing, Environmental sensing, Atmospheric sensing, Information science, Information technology, Numerical simulations, Data processing
By using the NCEP/NCAR daily reanalysis data, CMAP precipitation data , daily precipitation data of 740 stations
in China and some remote sensing data, features of the short-term position variation of the west Pacific subtropical
high(WPSH) during the torrential rain in Yangtze-Huaihe river valley and its possible cause are analyzed. Results show
that the short-term position variation of WPSH is closely associated with the diabatic heating. During the torrential rain
period, the apparent heating source and apparent moisture sink are exceptionally strong over Yangtze-Huaihe river
valley( on the northwest side of WPSH )and the Bay of Bengal (to the west of WPSH). Based on the complete form of
vertical vorticity tendency equation, it is found that the heating field over Yangtze-Huaihe river valley during the
torrential rain period, which is in favor of the increase of cyclonic vorticity on the north side of WPSH, is unfavorable to
the WPSH moving northward. And the heat source over the Bay of Bengal ,which is in favor of the increase of
anti-cyclonic vorticity on the west of WPSH, may induce the westward extension of WPSH.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.