摘要
采用旋转经验正交展开(REOF)方法,对广东48站前汛期降水标准化距平场进行客观分区,在此基础上对各区区域平均前汛期降水的长期演变趋势进行了讨论。结果表明:广东省前汛期降水量场可以划分为4个区域,即粤东区、粤中区、粤西北区以及雷州半岛区。该4区前汛期降水量线性趋势不显著,年代际变化特征明显。进入21世纪以来,除雷州半岛区降水持续减少外,其余各区出现明显增加。而20世纪90年代以来粤东区和粤中区旱涝发生更为频繁。
Abstract： Based on the REOF analysis and the classification of the standardized rainfall anomaly field in the pre flood sea- son in Guangdong, the long - term trends of the regionally - averaged rainfall are studied. Evidence reveals that, the precipitati- on field in the pre flood season can be clustered to 4 regions, East Guangdong, North Guangdong, Central Guangdong and South- west Guangdong. The linear trend of the pre flood season precipitation in each region is not prominent, while the features of the inter - decadal change are obvious. From the beginning of the 21 century, the precipitation in pre flood season shows a remarka- ble increase except for the continuous decrease in Southwest Guangdong. And the flood and drought becomes more frequent in East Guangdong and Central Guangdong since 1990s.
出处
《广东气象》
2007年第4期11-14,共4页
Guangdong Meteorology
基金
广州中心气象台科研基金资助
关键词
气候学
前汛期降水
旋转经验正交展开
广东
climatology
precipitation in pre flood season
rotated empirical orthogonal function（REOF）
Guangdong
