Condensation heating of the Asian summer monsoon and the subtropical anticyclone in the Eastern Hemisphere |
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| Authors: | Y M Liu G X Wu H Liu P Liu |
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| Institution: | (1) State Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China E-mail: lym@lasg.iap.ac.cn, CN |
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| Abstract: | The effects of condensation heating on the formation of the subtropical anticyclone in the Eastern Hemisphere (EH) are studied
by means of theoretical analysis and numerical simulation. The complete vorticity equation is employed for the analysis. It
is found that, due to the vertical gradient of strong condensation heating, the distribution of cyclone and anticyclone in
the upper troposphere is out of phase with that in the middle and lower troposphere. This is confirmed by a series of numerical
experiments. The horizontal gradient of the condensation heating also affects the configuration of the subtropical anticyclone.
It is concluded that condensation heating is a key factor for the formation and location of the summer subtropical anticyclone
in the EH. The latent heating released by the Asian monsoon rainfall contributes to the formation of the 200 hPa South Asian
anticyclone on the western side of the heating center and the 500 hPa western Pacific subtropical anticyclone on the eastern
side of the center. Such configurations are modified to some extent by surface sensible heating and orography. The circulation
in mid-latitudes is also affected by the latent heating in the subtropical area through the propagation of Rossby waves.
Received: 10 September 1999 / Accepted: 5 June 2000 |
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