科研之友
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摘要
The locations (longitudes and latitudes) of the tropical cyclones (TCs) making landfall on the Chinese mainland from 1949 to 2008 are investigated in detail by using ArcGis and FORTRAN routine. The southeast coastline [110 to 122 degrees E) with most landfall TCs was selected as the key region, which was divided into 12 subsections with 1 degrees intervals of longitude. The study period was from July to September in each year. The result showed that the average sustaining time of TCs making landfall on the subsections east of 118 degrees E is longer than those west of 118 degrees E. Before landfall, the averaged TC intensity in the subsections east of 118 degrees E is stronger than that west of it. After landfall, however, the difference between the west and east is not significant. The index of destructive potential for the period before/after landfall was defined as TDP1/TDP2. The maximum of TDP1/TDP2 occurred in the subsection of [119, 120 degrees E)/[110, 111 degrees E). The ENSO impact on the frequency and average location of landfall TC over the whole region at 110 to 122 degrees E is not obvious, but the effect varies with specific subsections. There is little differences of averaged TDP1 in the subsections between different phases of ENSO events, but the averaged TDP2 is larger in the warm events than that in the cold events. The rainstorm days of each station caused by TCs in different subsections were counted respectively. The results suggested that the rainstorm days of the subsections east of 118 degrees E are much more than those west of 118 degrees E. The larger values are primarily distributed at the subsections of [119, 120 degrees E) and [110, 111 degrees E).
