向外长波辐射(OLR)年际变化的时空分布分析  

The time-spatial distribution of interannual change for outgoing longwave radiation

作　　者：陶云[1] 曹杰[1] 

机构地区：[1]云南大学大气科学系

出　　处：《云南大学学报（自然科学版）》2005年第3期223-227,共5页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家重点基础研究发展计划资助(2003CB415100);国家青年科学自然基金资助项目(40305005).

摘　　要：运用1980～2001年75°S～75°N,0°～360°向外长波辐射(OLR)资料,计算获得各月OLR的均方差.结果表明:从全年的变化趋势来看,就整个全球纬向平均而言,低纬地区向外长波辐射的变化比中高纬地区向外长波辐射的变化约大1个量级;在80°E～150°W热带中东印度洋、西太平洋暖池以及热带中东太平洋一带(20°S～20°N)的OLR变化最显著,约在15W/m2左右;其中特别是"暖池"附近OLR的年际变化最大,其次是热带中东太平洋地区,再次是中东印度洋地区;1年当中,夏季6～8月OLR年际变化较小,平均在11W/m2左右;冬季12～2月OLR年际变化大,平均在15W/m2左右.低纬地区向外长波辐射的变化具有明显的季节性突变特征,主要突变时间发生在春末夏初的5,6月和秋季的10月.同时,根据上述OLR变化特征确定了OLR年际变化最大的关键区.The monthly standard deviation of outgoing longwave radiation(OLR) was obtained in terms of the data around 75°S-75°N and 0°-360° in 1980-2001.The results show that the OLR variation over low-latitude area is one order larger than that over middle- and -high latitude area in terms of the zonal average in the year.The area where the OLR has obvious interannual variation about 15W/m^2 is located at tropical middle eastern India Ocean,the western Pacific warm pool and middle eastern Pacific.The OLR interannual variation over the warm pool is the biggest one.The next to it is that one over the tropical middle eastern Pacific,and then the smallest one among the three is that over the tropical middle eastern India Ocean.The OLR interannual variation in summer,which is around 11W/m^2,is smaller than that in winter,which is around 15W/m^2.The OLR variation also has obvious seasonal abrupt change.The OLR abrupt changes occur in May and June,and in October.The area of the maximum OLR interannual change is confirmed.

关 键 词：向外长波辐射场 年际变化 时空分布 均方差 

分 类 号：P461[天文地球—大气科学及气象学]