Enhancement of aerosols in UTLS over the Tibetan Plateau induced by deep convective during the Asian summer monsoon
作者单位：Shanghai Meteorological Service Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic Sciences School of Physics Peking University Chinese Academy of Meteorological Sciences College of Environmental Science and Engineering Donghua University
会议名称：《创新驱动发展 提高气象灾害防御能力——第30届中国气象学会年会》
会议日期：2013年
学科分类：07[理学] 070601[理学-气象学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学]
关 键 词：aerosol Tibetan Plateau UTLS lidar
摘 要：Vertical profiles of aerosol extinction coefficients were measured by an Micro Pulse Lidar over the Tibetan Plateau during summer 2011. Observations show a persistent maximum in aerosol extinction coefficients in the upper troposphere-lower stratosphere (UTLS) within the anticyclone during the Aisian summer mosoon. These aerosol layers are generally located at an altitude of 18-19 km, 1-2 km higher than the tropopause, with broad layers depth ranging approximately to 3-4 km. Variations in these aerosols are closely related to the intensity of underlying deep convection. Efficient vertical transport resulting from the most intensive convection is considered to be most important for the enhancement of aerosols observed near the tropopause . Temporal variations in aerosol layer in UTLS over the Tibetan plateau show a significant peak at midnight. This further indicates that deep convection rather than condensation of water vapor plays an important role in the accumulation of aerosols in UTLS over the Tibetan Plateau.