Climatic Features of Rainfall Induced by Tropical Cyclones in Yongxing Island in Recent 60 Years
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Abstract:
This paper analyzes the climatic characteristics of the tropical cyclone (TC) centers that entered the range of 10°×10° (longitude×latitude) around Yongxing Island from 1958 to 2019. The results show that the Yongxing Island is influenced averagely by 9.4 TCs in a year, and the TCs show a significant (α=0.01) decreasing trend in 0.67 every decade (an trend coefficient of -0.406). This paper divides the TC paths in Yongxing Island into five categories: northwestward moving (A), southwestward moving (B), northeastward turning (C), southwestward turning (D), northeastward turning from west (E), of which Type A accounts for 52.0%. The annual rainfall caused by TCs exhibits a significant (α=0.05) decreasing trend (an regression coefficient of -61.76, an trend coefficient of -0.27). TC activities contribute the most to the heavy rainfall of Yongxing Island, reaching 67.8%, while the contribution of other weather systems is only 32.2%. The annual average number of rain days caused by typhoon is 4.1, while that caused by the others is 2.8 days. The contribution of Typhoon Rainstorms to annual storm rainfall shows no obvious variation trend (an regression coefficient of 0.57, an trend coefficient of 0.055), but the contribution of typhoon rainstorm days to annual rainstorm days shows a significant (α=0.01) decreasing trend (a regression coefficient of 4.7, a trend coefficient of -0.33).
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.