安徽省近60年雨日、降水量及雨强的气候变化特征
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P416.2;P467

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江苏省气象局北极阁开放研究基金(BJG201501)


Climatic variations of wet days,precipitation and rain intensity in Anhui province during the last 60 years
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    摘要:

    采用安徽省15站近60年来的降水资料,研究了季节和年雨日、降水量及雨强的气候变化特征.结果表明:1)空间分布上,雨日、降水量"南多北少",雨强中北部地区相当,皆小于南部地区;雨日数南北在冬春季相差较大,降水量夏季最多、冬季最少,雨强上南北在春季相差较大;雨日、降水量及雨强在年和季节上基本呈现显著正相关关系.2)时间演变上,雨日在减少,降水量、雨强在增多(大),且表现为两阶段的变化特征;小波分析显示约10 a的年代际周期变化,雨日上存在、降水量上在衰减、雨强上则不明显,约5 a、3 a的周期变化存在较多;雨日在春秋季减少明显,降水量春秋季减少,夏冬季增加但不明显,雨强尤以夏冬季增大明显;无论是年还是各季节的时间演变上,降水量与雨日、雨强均呈显著正相关,但雨日与雨强之间相关性则差些.

    Abstract:

    Based on the precipitation data of 15 observational stations during the last 60 years in Anhui province, the spatial & temporal features of annual and seasonal changes for wet days, rainfall and rain intensity were studied. The spatial distribution shows that wet days and rainfall are more in southern than in northern area;the rain intensity is almost equal in middle and northern areas, but less than that in southern area. As for the seasonal change, the precipitation is the most in summer and the least in winter in all areas;the wet days differ obviously between south and north in spring and winter, and the difference of rain intensity is large between south and north in spring. Wet days, rainfall and rain intensity show a significantly positive correlation between each other on both annual and seasonal levels. The temporal variation shows that wet days has declined, while precipitation and rain intensity have increased, and the characteristics can be divided into two stages. The wavelet analysis shows that wet days exists inter-decadal periodic (about 10 a), precipitation declines while rain intensity is not pronounced. Quasi-periodicities of 5 a and 3 a exist during the 60 a period. Wet days have declined significantly in spring and autumn. Precipitation has roughly declined in spring and autumn, and increased in summer and winter. Rain intensity has increased significantly, especially in summer and winter. On both annual and seasonal levels, precipitation has significant positive correlations with wet days and rain intensity, which is stronger than the correlation between wet days and rain intensity.

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王涛,刘承晓.安徽省近60年雨日、降水量及雨强的气候变化特征[J].南京信息工程大学学报(自然科学版),2019,11(1):101-109
WANG Tao, LIU Chengxiao. Climatic variations of wet days,precipitation and rain intensity in Anhui province during the last 60 years[J]. Journal of Nanjing University of Information Science & Technology, 2019,11(1):101-109

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  • 收稿日期:2016-06-06
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  • 在线发布日期: 2019-01-30
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