Trend in the atmospheric heat source over the central and eastern Tibetan Plateau during recent decades: Comparison of observations and reanalysis data  

作　　者：WANG MeiRong ZHOU ShunWu DUAN AnMin 

机构地区：[1]Nanjing University oflnformation Science&Technology,Nanjing 210044,China [2]Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China

出　　处：《Chinese Science Bulletin》2012年第5期548-557,共10页

基　　金：supported by the Chinese Ministry of Science and Technology (2010CB951703 and 2009CB421403);the Knowledge Innovation Program of Chinese Academy of Sciences (KZCX2-YW-Q11- 01);the National Natural Science Foundation of China (40975047)

摘　　要：The trend in the atmospheric heat source over the central and eastern Tibetan Plateau (CE-TP) is quantitatively estimated using historical observations at 71 meteorological stations, three reanalysis datasets from 1980-2008, and two satellite radiation datasets from 1984-2007. Results show that a weakening of sensible heat (SH) flux over the CE-TP continues. The most significant trend occurs in spring, induced mainly by decelerated surface wind speeds. The ground-air temperature difference shows a notable increasing trend over the last 5 years. Trends in net radiation flux of the atmospheric column over the CE-TP, evaluated by two satellite radiation datasets, are clearly different. Trends in the atmospheric heat source calculated by the three reanalysis datasets are not completely consistent, and even show opposite signals. Results from the two datasets both show a weakening of the heat source but the magnitude of one is significantly stronger, whereas an increase is indicated by the other data. Therefore, it is challenging to accurately calculate the trend in the atmospheric heat source over the CE-TP, particularly from the estimates of the reanalysis datasets.The trend in the atmospheric heat source over the central and eastem Tibetan Plateau （CE-TP） is quantitatively estimated using historical observations at 71 meteorological stations, three reanalysis datasets from 1980-2008, and two satellite radiation datasets from 1984-2007. Results show that a weakening of sensible heat （SH） flux over the CE-TP continues. The most significant trend occurs in spring, induced mainly by decelerated surface wind speeds. The ground-air temperature difference shows a notable in- creasing trend over the last 5 years. Trends in net radiation flux of the atmospheric column over the CE-TP, evaluated by two satellite radiation datasets, are clearly different. Trends in the atmospheric heat source calculated by the three reanalysis datasets are not completely consistent, and even show opposite signals. Results from the two datasets both show a weakening of the heat source but the magnitude of one is significantly stronger, whereas an increase is indicated by the other data. Therefore, it is chal- lenging to accurately calculate the trend in the atmospheric heat source over the CE-TP, particularly from the estimates of the reanalysis datasets.

关 键 词：再分析资料 气象观测站 大气热源 青藏高原 净辐射通量 定量估计 数据集 感热通量 

分 类 号：P468.0[天文地球—大气科学及气象学] P41