近40年浙江省降水量、雨日的气候变化
Climatic Variation of Rainfall and Wet Days in Zhejiang
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摘要: 用1961~1999年浙江省36站的资料, 研究了浙江省年、季、月降水总量与雨日数的气候变化。指出在浙江省年降水量增加的同时,雨日数没有同步的增加。浙江省除了7、8月份雨日是增加以外,其他月份的雨日数都表现为减少。由于7、 8月降水量的增加比雨日的增加更明显,反映出浙江省平均的日降水的强度增加了。研究还指出,雨日的减少是在1978年前后突变发生的。20世纪80年代以后, 浙江省9~12月的雨日已有大幅度的减少。Abstract: Study is made of climatic variation of rainfall and rainy on a yearly, monthly and daily basis in terms of 1961–1999 data from 36 stations in Zhejiang Province. The results show that the annual rainfall increased but the number of wet days did not correspondingly increase. The number increased in July and August but decreased in the other months, and rainfall increased more obviously than the number of rainy days in July and August, leading to the fact that mean daily rainfall intensity was augmented. The decrease in the number of wet days occurred abruptly around 1978 and the number reduced greatly in September–December after the 1998s .
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Key words:
- Zhejiang Province;
- Wet day;
- Rainfall;
- Climatic Change;
- Trend coefficient
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表 1 36 站的季降水量及雨日的趋势系数为正值的站数
表 2 36 站的月降水量及月雨日的趋势系数的统计表
表 3 浙江省9 ~ 12 月雨日的年代际变化
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