青藏高原北部的大气加热场特征

Characteristics of Atmospheric Heating Field over Northern Qinghai-Xizang Plateau

利用五道梁 1 994— 1 997年的实际观测资料 ,结合一些经验计算公式计算得到了 1 994— 1 997年青藏高原北部地区的大气加热场强度。结果表明 ,从 4年平均情况来看 ,高原北部地区 4～ 8月大气加热场为热源 ,1 0月～ 2月为冷源 ,3月和 9月为转换时期 ;就年平均大气加热场强度年际变化来看 ,1 994年和 1 995年为大气冷源 ,1 996年和 1 997年则为大气热源 ;

The intensity of atmospheric heating field over the Northern Qinghai Xizang Plateau is calculated by usingthe data observed at Wudaoliang and some experimential formula. The resultsshow that the atmospheric heating fields act as heat source from April to August over the Northern Qinghai Xizang Plateau and theyactas heat sink from October to February, transformation period in March and September, respectively.The annual means of atmospheric heating field acted as heat sink in 1994 and 1995 but they acted as heat source in 1996 and 1997. The interannual changes of intensity of atmospheric heating field are determined mainly by the interannual changes of surface sensible heat flux.