摘要
选用华中五省(河南、湖北、湖南、安徽、江西)20个全球交换站1959-2005年逐月云量观测资料,用EOF方法分析了近47a来华中五省总云量的年、季节变化规律及其地域分布特征,以期对气候模式开发和模拟研究提供参考,并为华中五省气候变化和农业生产区划提供数据支持。结果表明:近47a来,华中五省平均年、季总云量总体呈减少趋势。总云量变化地区差异较大,主要有2种典型时空分布。第一典型场中,年、季均为正值,且均由南向北呈现出低-高的差异,中心位于华中五省中偏北部地区。对应时间系数中,年、春、秋季1959-2005年总体呈明显波动下降趋势,可得出年、春、秋季总云量近47a呈减少趋势,夏季无明显变化,冬季变化趋势也不明显。第二典型场中,年、四季均大体以长江为界呈反向变化,对应时间系数以年际变化为主。
Based on monthly cloud cover observation data from 20 global exchange stations of five provinces（Henan,Hubei,Hunan,Anhui and Jiangxi province） in central China during 1959-2005,the seasonal / annual variation and regional distribution of total cloud cover in last 47 years were analyzed.The results showed that both of average annual and seasonal total cloud cover in central China decreased in last 47 years.Variation of total cloud cover changed among different regions,and there were two kinds of typical space-time distribution.One was positive variation for both annual and seasonal,and increasing from south to north.Its center located in the northern-middle part of central China.The cloud cover of spring and autumn declined and there was no obvious change in summer and winter from 1959 to 2005.The other was reverse variation on the two sides of the Yangtze river,obvious in annual variation.
出处
《中国农业气象》
CSCD
2011年第4期507-513,共7页
Chinese Journal of Agrometeorology
基金
国家自然科学基金项目"下击暴流形成与扩散的混合数值模拟及输电塔倒塌的灾害分析"(50978209)
中国气象局气象关键技术集成与应用(重点)项目"阳江国际比对辅助遥感试验资料分析"(CMAGJ2011Z19)
国家科技支撑计划项目(2007BAC29B02)
科技部行业专项(GYHY200806029)
关键词
云量
趋势
变化
EOF
Cloud cover
Variation trend
Change
EOF
