HEIFE戈壁地区近地层大气的湍流结构和输送特征

TURBULENCE STRUCTURE AND TRANSFER CHARACTERISTICS IN THE SURFACE LAYER OF HEIFE GOBI AREA

中文关键词:  戈壁  近地层  湍流结构  湍流输送

英文关键词:Gobi  Surface layer  Turbulence structure  Turbulence transfe

中文摘要:

      根据黑河地区地气相互作用实验研究(HEIFE)1988年POP和1990年PIOP实验的观测资料,分析了戈壁地区近地层大气的湍流结构,主要是风速分量和温度方差的相似关系,以及各有关量的功率谱和湍流通量的协谱。1988年POP期间发现的戈壁近地层大气中白天经常出现的水汽由上而下输送等特殊现象,在1990年PIOP中得到进一步的验证。文中分析了有关物理机制,认为这一现象和众所周知的“绿洲效应”是戈壁-绿洲这一地区性中尺度环流影响的两个侧面。

英文摘要:

      In Sept. 1988 and Aug. 1990,two observational experiments have been carried out in the HEIFE Gobi station. A data set on the surface layer turbulence has been collected, which is proved to be of high quality. An analysis on the surface layer structure shows that turbulence statistics such as the variances of vertical wind component and temperature are in good agreement with the surface layer similarity theory. The relevant forms of similarity function are presented.The characteristics of spectra and cospectra are mainly similar to that of flat and horizontal terrain. The phenomenon of downward water vapor flux over Gobi desert in daytime, which was noticed in 1988,was confirmed in the PIOP of 1990. An analysis on its physical mechanism is given. As the well-known ‘oasis effect',this phenomenon is closely related to a loca ‘Gobi desert-oasis' circulation system.