The diurnalcharacteristics of deepconvective boundarylayer inarid regionsad in Northwestern China

Atmospheric boundary layer(ABL) has a significant impact on the climate and atmospheric circulation [1] [2] [3], and it can also affect the spatial and temporal distribution of aerosols [4]. In addition, the atmospheric boundary layer plays an important role in air pollution, agricultural meteorology, hydrological processes and numerical weather prediction [5]. Therefore, great attention was paid to the study of atmospheric boundary layer. Northwestern China, which is adjacent to the arid region in Central Asia, is considered to be one of the largest and the most typical arid region in the world. So no matter to study of arid weather or that of climate this area is both very important. In this region, the heating effect of the underlying by ABLis different from that in humid region. Usually, the ABL with the height about 1-2km is studied. Deep ABL is not often studied.