关键词: 热带气旋, 气候统计, 路径, 变性

Abstract: Based on data from Tropical Cyclone (TC) Yearbook of China and surface meteorological observations,the TCs influencing Shandong province from 1949 to 2012 were statistically analyzed.The results show that the averaged annual number of TCs influencing Shandong province is two from 1949 to 2012.The maximum number of seven occurred in 1985 and 2012,respectively.These TCs usually occur from May to November and concentrate between July and September,with the maximum frequency of 46.3% occurring in August.These TCs usually have parabolic shaped tracks and mostly start from the ocean around the Philippines,move northwestwards to the mid-higher latitudes,and then turn northeastwards.Only a few of them move northwestwards from high latitudes into the inland of China.When these TCs moved close to Shandong province,their intensifications have usually weakened.The landing points of TCs in Shandong province are mainly along the coasts of the southeastern region of Shandong province and the southern part of Shandong Peninsular.The distributions of precipitation and strong winds are different due to the different TC tracks.TC precipitation mostly occurs in the middle and eastern parts of Shandong province,with the extreme precipitation areas in the southeastern region of Shandong and the southern and eastern parts of Shandong Peninsular.The rate of extratropical transition among TCs influencing Shandong province is 58.2% that is much higher than that in the northwest Pacific Ocean on average.These TCs have obvious interaction with systems at middle latitudes.

Key words: Tropical Cyclone (TC), Climatic statistics, Track, Extratropical transition