论文部分内容阅读
NCEP/NCAR reanalysis data and a 47-year precipitation dataset from 42 observed daily rainfall from gauge stations are utilized to analyze the relationship between atmospheric heat source (hereafter called ) over the Tibetan Plateau (TP)and precipitation in the Sichuan-Chongqing region in the summer has been studied in this paper, The result shows that: the vertical transport term of over the central of TP is on of the major factors which affects the precipitation in the Sichuan-Chongqing region in the summer; when the value of the vertical transport term of over the central of TP was strengthened, the South Asia High shifted to southern and eastern than the normal, the Subtropical High over Western Pacific shifted to southern and western than the normal, and the Indian low was weakened, which are favorable the warm vapor from the low latitude oceans transported to the Sichuan-Chongqing region, the same time, in the high latitude form two ridges and one trough, lead to the cool air move to the south, with the warm vapor from low latitude convergence over the Sichuan-Chongqing region lead to the flood; conversely, when the value of the vertical transport term of over the central of TP is weakened, lead to the South Asia High move to north and west in location, the Subtropical High move to east and north in location, and the Indian low was strengthened, this circulation pattem is unfavorable for the warm vapor from low latitude ocean transported to Sichuan-Chongqing region, and the cool air is difficulty to move to south too with the two troughs one ridge in the high latitude, the convergence and ascent were weakened, lead to drought in the Sichuan-Chongqing region.