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RISS 인기검색어
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- 저자 : Roger A. Pielke Sr. (검색결과 1 건)
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Synoptic-Scale Physical Mechanisms Associated with the Mei-yu Front: A Numerical Case Study in 1999
Nguyen Minh Truong,Vu Thanh Hang,Roger A. Pielke Sr.,Christopher L. Castro,Koji Dairaku 한국기상학회 2012 Asia-Pacific Journal of Atmospheric Sciences Vol.48 No.4
The Mei-yu front system occurring from 23 to 27 June 1999 consists of the Mei-yu front and the dewpoint front, which confine a warm core extending from the eastern flank of the Tibetan Plateau to the west of 145oE. To further understand the synopticscale physical mechanisms associated with the Mei-yu front system,the present study proposes another insight into the physical significance of the x-component relative vorticity (XRV) whose vertical circulation is expected to tilt isentropic surfaces. The XRV equation diagnoses exhibit that the twisting effect of the planetary vorticity (TEPV) is positive along the Mei-yu front and negative in the dewpoint front region, and tilts isentropic surfaces from south to north in the Mei-yu frontal zone. Conversely, the meridional gradient of the atmospheric buoyancy (MGAB) tilts isentropic surfaces in the opposite direction and maintains negative in the regions where the TEPV is positive and vice versa. Thus, the TEPV plays the role of the Mei-yu frontogenesis, whereas the MGAB demonstrates the Meiyu frontolysis factor. Both terms control the evolution of the crossfront circulation. The other terms show much minor contributions in this case study. The present simulations also indicate that the weakening of the upper-level jet evidently induces the weakening of the Mei-yu front and reduces the amplitude of the East Asia cold trough. Furthermore, the impact can also penetrate into the lower troposphere in terms of mesoscale disturbances and precipitation,proving that the upper-level jet imposes a noticeable top-down influence on the Mei-yu front system.
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