【摘要】 本文分析了1988年9月在甘肃省临泽县城西南侧戈壁获得的近地面层微气象观测资料。结果表明:白天晴空一般都是超绝热不稳定状态,并存在一种逆湿现象,造成向下输送的水气通量。这可能是由于戈壁地表极其干燥,没有蒸发,上层大气湿度反而比近地面层高,致使水汽从上往下输送。这时在地表面热量平衡过程中,潜热可以忽略不计,感热占绝对优势。更多还原

【Abstract】 In the paper we have analysed results of micrometeorological observation in the surface layer in Gobi to the southwest of Linze town, Gansu province in September 1988. The results show in general the atmosphere is superadiabatic unstable state and there is a phenomenon of inverse humidity forming downward vapour transportation in cloudless daytime. It may be that there is no evaporation as a consequence of very dry ground surface in Gobi, hence the atmospheric humidity above surface layer is higher than that in surface layer unusually cause the vapour transportation from up to down. The sensible heat flux is dominant in the heat energy budget on ground surface and the latent heat can be neglected.更多还原