SOUTHERN BOUNDARY FORCING RELATIVE TO GENESIS, MAINTENANCE AND OSCILLATION OF A SUBTROPICAL HIGH* |
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| Authors: | Lu Weisong and Tao Li |
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| Institution: | Department of Meteorology, Nanjing Institute of Meteorology, Nanjing 210044;Department of Meteorology, Nanjing Institute of Meteorology, Nanjing 210044 |
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| Abstract: | A nonlinear critical layer and a Kelvin cat's eye excited thereupon are simulated through four schemes in the context of a nonlinear quasi-geostrophic barotropic vorticity equation model with forced stationary wave acting along the southern boundary to investigate effects of tropical steady forcing on the genesis,maintenance and oscillation of a subtropical high(STH).Evidence suggests that the southern forcing is responsible for the planetary quasi-steady anticyclonic Kelvin cat's eye-form flow field inside the nonlinear critical layer,with the eye shifting,vigor and shape changing quite similar to the behaviors of a summer STH,in striking contrast to the northern stationary forcing.As such,the southern boundary-caused cat's eye is likely to be an even more important mechanism for STH genesis and evolution.In addition,a physical mechanism is introduced for quasi-steady planetary wave moving through the critical layer at subtropical latitudes. |
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| Keywords: | nonlinear critical layer subtropical high southern boundary forcing |
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