摘要
根据1949～2002年共54年的台风资料对非汛期(10月～次年4月)西北太平洋台风活动的气候特点进行了统计分析,指出:非汛期内影响、严重影响海南的热带气旋频次均无明显的减少趋势,其频次存在准10年、15～20年的主周期,其年代际变化表现为1950年代中期～1960年代后期偏少,1970年代前期偏多,1970年代后期偏少,1980年代偏多,1990年代偏少;非汛期内严重影响海南的较强的热带气旋主要出现在拉妮娜年且其年代际变化也存在15～20年的主周期,1950年代后期到1960年代前期活动的热带气旋偏弱,1960年代后期～1970年代前期偏强,1970年代后期偏弱,1980年代偏强,1990年代又偏弱;较强的热带气旋(中心极值940hPa以下)均生成于135°E以东的洋面,而其源地越西,其强度越小;非汛期登陆海南的热带气旋的登陆点均处于海南岛的东侧海岸线上,1970年代中期以后,登陆点有南移趋势,且均以台风形式登陆。
Analyzing Hainan-influencing North-West Pacific Tropical Cyclones＇ climate characteristics off the rainy seasons （October to next April） by using 54 years of typhoon data from 1949 to 2002, we have the following preliminary results： TCs Influencing or seriously influencing Hainan have no notable decrease off the rainy seasons during the 54 years. There exist obvious periods of quasi-10 years and 15-20 years in the variation of those TCs＇ annual frequency, and decadal variability was small from mid-1950s to late 1960s, during late 1970s and late 1990s but was great during early-1970s and 1980s.Strong TCs that seriously influence Hainan mainly appear in La Nina years. There also exist obvious periods of quasi- 10 years and 15-20 years in the variation of the intensity of the TCs. The decadal variability is small from mid-50s to late-60s, during late 1970s and during 1990s, but being larger during early-70s and during 1980s; Stronger TCs （with center pressure lower than 940hpa） generate on the ocean surface east of 135°E; the more westward they generate, the weaker they are. The location the TCs land in Hainan during off-rainy seasons are all on the east coast, shifting south after mid-1970s and the landing TCs all appeared as typhoons afterwards.
出处
《热带气象学报》
CSCD
北大核心
2006年第3期301-307,共7页
Journal of Tropical Meteorology
关键词
非汛期
严重影响
热带气旋
气候特征
off rainy seasons
heavy influence
tropic cyclones
variation characteristics
