NCEP/NCAR data are utilized to analyze an extreme flood year(1998) and an extreme dry year(2006) in the Sichuan-Chongqing region(SCR) and the results are as follows. The positive divergence of South Asia High(SAH) is ...NCEP/NCAR data are utilized to analyze an extreme flood year(1998) and an extreme dry year(2006) in the Sichuan-Chongqing region(SCR) and the results are as follows. The positive divergence of South Asia High(SAH) is stronger in the flood year; the position of the ridge line of SAH is southward compared with the annual average; Western Pacific Subtropical High(WPSH) extends westward and its ridge line is southward. In the drought year, the positive divergence of SAH is weaker, its ridge line is northward, and the position of WPSH is also northward. As shown in the dynamics, in drought(flood) years, negative(positive) vorticity advection in the upper atmosphere can cause the atmosphere to ascend(descend), and anomalous circulation of SAH displays divergence(convergence), and anomalous circulation of the lower atmosphere shows convergence(divergence). Thermal structure of the atmosphere shows that there is warm(cold) temperature advection in the lower atmosphere, and the vertical distribution of diabetic heating causes SAH's local circulation to display convergence(divergence) and affects vertical motion of the lower atmosphere circulation eventually. To some extent, the two extreme years in the SCR is closely related to the vertical motion of atmosphere circulation and the variation of such vertical motion is caused by differences of interactions between SAH and lower atmosphere circulations.展开更多
With the gradual improvement of urban economic conditions,the features of local cities have been seriously damaged,and their characteristics have gradually weakened or even disappeared in the wave of urbanization.Taki...With the gradual improvement of urban economic conditions,the features of local cities have been seriously damaged,and their characteristics have gradually weakened or even disappeared in the wave of urbanization.Taking Nanchong City,the core city in Sichuan-Chongqing region,as the research object,the paper excavates the local characteristics of Nanchong by means of historical tracing and field investigation.Through the research on the urban characteristics of Nanchong,it is hoped to provide some references for the construction of local urban characteristics in the rapid development of China at the present stage.展开更多
基金National Key Basic Research Development Program Project of China(2012CB417202)Key Project of National Natural Science Foundation(91337215)National Natural Science Foundation of China(41275051)
文摘NCEP/NCAR data are utilized to analyze an extreme flood year(1998) and an extreme dry year(2006) in the Sichuan-Chongqing region(SCR) and the results are as follows. The positive divergence of South Asia High(SAH) is stronger in the flood year; the position of the ridge line of SAH is southward compared with the annual average; Western Pacific Subtropical High(WPSH) extends westward and its ridge line is southward. In the drought year, the positive divergence of SAH is weaker, its ridge line is northward, and the position of WPSH is also northward. As shown in the dynamics, in drought(flood) years, negative(positive) vorticity advection in the upper atmosphere can cause the atmosphere to ascend(descend), and anomalous circulation of SAH displays divergence(convergence), and anomalous circulation of the lower atmosphere shows convergence(divergence). Thermal structure of the atmosphere shows that there is warm(cold) temperature advection in the lower atmosphere, and the vertical distribution of diabetic heating causes SAH's local circulation to display convergence(divergence) and affects vertical motion of the lower atmosphere circulation eventually. To some extent, the two extreme years in the SCR is closely related to the vertical motion of atmosphere circulation and the variation of such vertical motion is caused by differences of interactions between SAH and lower atmosphere circulations.
基金Sponsored by Nanchong City School Science and Technology Strategic Cooperation Project (19SXHZ0042)。
文摘With the gradual improvement of urban economic conditions,the features of local cities have been seriously damaged,and their characteristics have gradually weakened or even disappeared in the wave of urbanization.Taking Nanchong City,the core city in Sichuan-Chongqing region,as the research object,the paper excavates the local characteristics of Nanchong by means of historical tracing and field investigation.Through the research on the urban characteristics of Nanchong,it is hoped to provide some references for the construction of local urban characteristics in the rapid development of China at the present stage.
