中国大陆OLR与西北夏季降水

THE RELATIONSHIP BETWEEN OLR OF MAINLAND AND PRECIPITATION IN SUMMER IN NORTHWEST CHINA

中文摘要:

      中国西北地域辽阔,地形复杂.该区内大部分地方属干旱、半干旱气候区,降水量的时空分布差异很大.为研究这种差异性,作者曾将西北地区夏季(6-8月)降水总量作了EOF分解,指出西北夏季降水总量与热带太平洋海温及ENSO事件关系密切^[1,2];蒋尚城等用9年NOAA卫星观测的OLR资料对长江流域地区夏季雨量进行的估算^[3]、徐国昌等用OLR对夏季青藏高原月雨量及凝结潜热的估算^[4],均得到较好的结果.这些研究表明,OLR与大陆夏季降水量存在着与热带海洋上一样好的关系.由于西北夏季雨量集中,6-8月降水量占全年雨量的一半以上.OLR通过云的变化与降水量之间必然存在较好的相关性.

英文摘要:

      In this paper, the monthly precipitation in Northwest China in summer is firstly resolved by EOF method. Then, the distribution characteristics of time and space of the resolved first main weight and eigenvector, and the correlation between the first main weight and OLR in the same time were analysed. Through comparative analysis, the result indicates that the difference between monthly dificient rainfull years and abundant rainfall years is obvious in summer in Northwest China, and that the precipitation in summer in Northwest China shows opposite tendency of that in Southern China.