青藏高原地表净辐射若干重要特征研究

SOME MAJOR FEATURES OF SURFACE NET RADIATION IN THE QINGHAI-XIZANG PLATEAU

Based on survey data in the Qinghai-Xizang Plateau for theperiods of May-August 1979 and of August 1982-July 1983, inve-stigation is performed of some major features of the surface net radiation(SNR) varying versus the sun's elevated angle, height above thc MSL,cloudiness, cloud forms and the condition of the underlying surface,with focus on the profile of the SNR and the sign of the winter SNR.The distribution pattern of the radiation as a function of elevationtakes the form of parabola under the clear sky obtained from in-situobservations and numerical studies. Besides, discussion is made of thedecisive effect of the winter snow cover on the SNR, arriving at theconclusion that in winter the SNR remains positive in the main partof the Plateau apart from the sources of the Huanghe and ChangjiangRivers that are likely to be marked by negative values.