Analysis on the Differences of Rainfall and Corresponding Circulation Between Winter and Spring in the Low-latitude Highlands

doi:10.3969/j.issn.1000-6362.2015.04.007

Abstract

Abstract: In order to reveal the difference of temporal evolution and spatial distribution of rainfall and the corresponding circulation difference in winter and spring, and get the reason of drought in low-latitude highlands applied EOF, correlation analysis, wavelet analysis to analyze 148 stations’ observational precipitation. The results showed that there was a prominent difference between the winter and spring rainfall’s temporal evolution and spatial distribution. The spring rainfall was more than the winter's a lot, and the most different area was located in western and southern low-latitude highlands, which seemed to be a "L" pattern. The winter rainfall had a 4-6 years cycle during 1985-1990 and after 2005 and had quasi-2 years and around 10 years cycles after 1990.The spring rainfall had a 4-6 years cycle before 1995 and quasi-2 years cycle after 2001. The differences of circulation background accounted for the difference between the winter and spring rainfall. Compared to winter, the east Asian Trough to the north of the Tibetan Plateau was weaker and the southern branch trough to the south of the plateau was more active in spring; the subtropical high in the western pacific was more westward and stronger, then the flow along its flank was easier to reach to the low-latitude highlands with more water vapor input. The convergence area between the subtropical high and south high shifted more northward. Further studies indicated that the winter rainfall was very linked to the near-surface heating over around the bay of Bengal area, but the spring rainfall was closely related to the specific humidity.

Key words: Low-latitude highlands, Winter and spring, Rainfall difference, Circulation difference

LIU Kui, YANG Jing-xin,YANG Wang, YANG Ruo-wen , GUI Shu. Analysis on the Differences of Rainfall and Corresponding Circulation Between Winter and Spring in the Low-latitude Highlands[J]. Chinese Journal of Agrometeorology, 2015, 36(04): 437-445.

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