林芝地区夏季旱涝年环流场和OLR场特征分析
Circulation and OLR Fields Characteristics Analysis During the Waterlog and Flood Years in Nyingchi
中文摘要：
采用NCEP再分析资料、1974—2010年全球OLR（Outgoing Longwave Radiation）逐日格点资料以及林芝地区1980—2010年4个代表站的7—8月降水实测资料，选取了林芝地区4个典型多雨年和4个典型少雨年，对林芝地区旱涝年形势场和OLR场的时空分布规律进行了合成与分析。结果表明，林芝地区旱年与涝年的大气环流形势和OLR场存在明显的差异，林芝地区旱涝与低纬OLR的分布变化密切相关，特别是西太平洋副热带高压、西太平洋ITCZ和印度洋ITCZ的位置和强度以及赤道中东太平洋OLR的距平在旱涝年均有显著差别。
中文关键词：
林芝地区，旱涝，环流场，OLR场
KeyWords：
Nyingchi, drought and waterlog, circulation field, OLR field
Abstract：
Based on the reanalyzed data of U.S. National Centers for Environmental Prediction and the U.S. National Center for Atmospheric Research (NCEP/NCAR) as well as the daily gridded data of global OLR (Outgoing Longwave Radiation) in 1974-2010 and monthly precipitation measured data in July-August 1980-2010 of four representative stations in Nyingchi, the authors explored four typical rainy years and four typical drier years and combined the situation field of flood and drought years with the spatial and temporal distribution of the OLR field, and analysed the atmospheric circulation corresponding to drought years and flood years and OLR distribution characteristics in Nyingchi. The results show that, there are apparent differences between the OLR and atmospheric circulation in drought and flood years in Nyingchi and the close relationship between the drought and flood situation in Nyingchi and the distribution changes of low latitude OLR. Especially in the Western Pacific subtropical high, the West Pacific ITCZ and the Indian Ocean ITCZ position and intensity and the equatorial Pacific Middle East of OLR surface drought in annual significant differences.Finally, the pre-circulation field characteristics and OLR anomalies were analyzed.