Relationship Between the Western Pacific Subtropical High and the Subtropical East Asian Diabatic Heating During South China Heavy Rains in June 2005 |
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| Authors: | Lijuan Wang Hui Gao Zhaoyong Guan Jinhai He |
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| Institution: | Key Laboratory of Meteorological Disaster of Ministry of Education, College of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044;Key Laboratory of Meteorological Disaster of Ministry of Education, College of Atmospheric Sciences,
Nanjing University of Information Science & Technology, Nanjing 210044;Key Laboratory of Meteorological Disaster of Ministry of Education, College of Atmospheric Sciences,
Nanjing University of Information Science & Technology, Nanjing 210044;Key Laboratory of Meteorological Disaster of Ministry of Education, College of Atmospheric Sciences,
Nanjing University of Information Science & Technology, Nanjing 210044 |
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| Abstract: | Based on the daily NCEP/NCAR reanalysis data, the position variation of the western Pacific subtropical high (WPSH) in June
2005 and its relation to the diabatic heating in the subtropical East Asia are analyzed using the complete vertical vorticity
equation. The results show that the position variation of the WPSH is indeed associated with the diabatic heating in the subtropical
East Asian areas. In comparison with June climatology, stronger heating on the north side of the WPSH and relatively weak
ITCZ (intertropical convergence zone) convection on the south side of the WPSH occurred in June 2005. Along with the northward
movement of the WPSH, the convective latent heating extended northward from the south side of the WPSH. The heating to the
west of the WPSH was generally greater than that inside the WPSH, and each significant enhancement of the heating field corresponded
to a subsequent westward extension of the WPSH. In the mid troposphere, the vertical variation of heating on the north of
the WPSH was greater than the climatology, which is unfavorable for the northward movement of the WPSH. On the other hand,
the vertical variation of heating south of the WPSH was largely smaller than the climatology, which is favorable for the anomalous
increase of anticyclonic vorticity, leading to the southward retreat of the WPSH. Before the westward extension of the WPSH
in late June 2005, the vertical variation of heating rates to (in) the west (east) of the WPSH was largely higher (lower)
than the climatology, which is in favor of the increase of anticyclonic (cyclonic) vorticity to (in) the west (east) of the
WPSH, inducing the subsequent westward extension of the WPSH. Similar features appeared in the lower troposphere. In a word,
the heating on the north-south, east-west of the WPSH worked together, resulting in the WPSH extending more southward and
westward in June 2005, which is favorable to the maintenance of the rainbelt in South China. |
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| Keywords: | heavy rains in South China western Pacific subtropical high diabatic heating complete vertical vorticity equation |
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