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A case study of cold-seasonthundersnow in Beijing

Atmospheric and Oceanic Science Letters 2019年第6期12卷 392-398页

作者： jiao reguang CHEN Bin HABIB Ammara SHI Guangyu Institute of Atmospheric Physics Chinese Academy of SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjingChina

The characteristics of local thundersnow at ne spatiotemporal scale on 9 and 10 November 2009 in Beijing were analyzed,using wind pro ler,microwave radiometer,automatic weather station,Doppler weather radar,and satellite ***,the causes of winter convection are *** results showed that it was reflux *** cause of the thunder and lightning was the elevated convection above the lower cold and dry air,and the trigger for convection was the short wave trough and convergencein the middle *** thundersnow event developed from monsoon-like long-lasting water vapor transport at 850 hPa from the South China Sea along with strong instability of,and convergence in,the conveyor layer.

关键词： Thundersnow reflux doppler radar wind profiler radiometer

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Dust particles in free troposphere over Chinese desert region revealed from balloon borne measurements under calm weather conditions

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Atmospheric and Oceanic Science Letters 2019年第1期12卷 12-20页

作者： HABIB Ammara CHEN Bin SHI Guangyu IWASAKA Yasunobu NATH Debashis KHALID Bushra TAN Saichun MAHMOOD Tariq jiao reguang NTWALI Didier Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology Kanazawa Univeristy Department of Environmental Science International Islamic University International Institute for Applied Systems Analysis The Abdus Salam International Centre for Theoretical Physics

The Taklamakan Desert in China is one of the major source regions for Asian dust *** balloon-borne measurements in this report were carried out in Dunhuang,in the Taklamakan Desert,during calm weather *** aerosol number concentration,size distribution,mass concentration,and horizontal mass flux due to westerly wind were *** measurements were performed on 17 August 2001,17 October 2001,11 January 2002,and 30 April *** channels(0.3,0.5,0.8,1.2,and 3.6μm in diameter)were used in the Optical Particle Counter for particle *** aerosol number concentration in the winter season(11 January 2002)at 3–5 km was very *** of free-tropospheric aerosols on 30 April 2002 was noticeable.A super-micron range was noticeable in the size distribution of all the *** variations in temperature and aerosol concentration were found at these inversion *** values of estimated mass concentration of aerosols were frequently observed in the atmosphere near the ground(i.e.,1–2 km);and interestingly,relatively high concentrations were frequently detected above 2 km from the *** patterns observed using ERA-Interim data at 500 and 850 hPa showed that westerly winds dominated in the Taklamakan Desert during the observation *** average horizontal mass flux of background Asian dust due to westerly wind was observed to fall within the range of 58.5–1219 tons km?2 d?*** profiles of aerosol number concentrations showed that significant transport of aerosols dominated in the westerly region(i.e.,4–7 km).

关键词： Aerosols optical particle counter balloon-borne measurements Dunhuang

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