摘要
对广西 195 9- 2 0 0 0年盛夏极端最高气温≥ 35℃及≥ 37℃总日数与平均气温≥ 30℃总日数进行气候分析 ,发现 :各级别最高气温总日数 7月份 90年代比 6 0～ 80各年代均明显偏少 ,而 8月份 90年代比 6 0～ 80各年均明显偏多 ;7月份极端最高气温总日数具有减少趋势 ,而 8月份各级别最高气温总日数具有增多趋势。 7月与 8月极端最高气温≥ 35℃与日平均气温≥ 30℃总日数 ,分别由 1990年以前的多日数期向少日数期转变和由 1989年以前的少日数期转多日数期。广西盛夏高温总日数偏多年份与偏少年份 5 0 0 h Pa环流场存在明显的差异 ,5 0 0 h Pa高度场有较明显的 10 a尺度变化 ,而这种 10 a尺度的环流异常变化是造成 90年代广西盛夏
This paper makes a climatic analysis of the total day number with the extreme max temperature of ≥35℃ and ≥37℃ and the total day number with the average temperature of ≥30℃ in summer during 1959 ~ 2000 It founds that the total day number in July with the max temperature of each grade is obviously less in 1990s than that in 1960s, 1970s and 1980s, while the number in August is obviously more in 1990s than that in 1960s, 1970s and 1980s Total day number in July with the max temperature tends to decrease while that in August tends to increase Total day number with the extreme max temperature of ≥35℃ and the total day number with the average temperature of ≥30℃ in July and August changes from the more to the less before 1990 and from the less to the more before 1989 respectively Clear difference exists between the 500hPa circumfluence field of the years with more total day number of high temperature and that with less day number Clear 10 year scale change occurs in the 500hPa height field, while this abnormal 10 year scale circumfluence change is a key reason for the more total high temperature day number in August of Guangxi in 1990s
出处
《广西气象》
2001年第2期14-19,共6页
Journal of Guangxi Meteorology
关键词
盛夏
高温
天气
特点
环流
特征
广西
midsummer
high temperature
weather
characteristics
circumfluence
features
