摘要
用江苏省74站点近57 a雷暴资料,统计分析了江苏省雷暴日数的时、空分布特征,结果显示:江苏雷暴日数年际变化整体呈减少趋势,年代际差异较大,1980s前后是江苏省雷暴日数的转折点。江苏地区雷暴日数减少趋势主要表现在夏季和秋季雷暴日数的减少,而春季变化不明显。江苏地区每10 a雷暴日数减少约2 d左右。不同季节江苏雷暴的发生区域具有一定的规律性,春季和秋季主要的发生区域位于江苏的南部,并且平均雷暴日均自北向南增多,夏季雷暴高值区向北推移到江苏的中部和淮河地区。在年代际变化中,年雷暴日数明显的正距平期主要分布在1970s中期以前,负距平期主要出现于1970s后期—1980s中期和1990s后期—21世纪初期。
The time and space distribution characters of thunderstorm day number are studied in this paper by using the observational data of thunderstorm of 74 stations in Jiangsu during 1951--2007. The results showed that the annual number of thunderstorm days has a decreasing trend and interannual thunderstorm variability is significant. The 1980s is the turning point of thunderstorm day number. The seasons that show decreasing trend mainly exist in summer and autumn, and the trend is not obvious in spring. The numerical value of decreasing days is about 2 d per decade. The occurring area of thunderstorm possessed certain regularity in different season. The primary happening area lies in the south of Jiangsu and mean thunderstorm number is increasing from north to south. The more thunderstorms have been found in the middle of Jiangsu and near Huaihe river. Among interannual change, the obviously positive departure periods mainly happened before the mid 1970s. There are negative departure periods from the late 1970s to the mid 1980s, and from the late 1990s to the early 2000s.
出处
《气象科学》
CSCD
北大核心
2009年第6期827-832,共6页
Journal of the Meteorological Sciences
基金
江苏省科技厅社会发展项目(BS2007088)
关键词
雷暴
气候特征
时空分布
气候趋势
Thunderstorm Climatic characteristic Temporal-spatial distribution Climatic trend
