Quantitative Estimation of Air Mass Exchange by Along-Valley Wind in the Rongbuk Valley  

作　　者：Zhou Li-Bo Zou Han Ma Shu-Po Zhu Jin-Huan Li Peng Huo Cui-Ping 

机构地区：[1]LAPC & LAOR, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China [2]Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China

出　　处：《Atmospheric and Oceanic Science Letters》2009年第1期29-34,共6页大气和海洋科学快报(英文版)

基　　金：financed by the National Natural Science Foundation of China (Grant No.40533018);the Ministry of Science and Technology of the People’s Republic of China (Grant No.2009CB421403);the Chinese Academy of Sciences (Grant Nos.KZCX3-SW-231 and 8-070203)

摘　　要：For a better understanding of the air mass exchange processes between the surface and free atmos-phere in the Himalayas,a Himalayan exchange between the surface and troposphere 2007 (HEST2007) campaign was carried out in the Rongbuk Valley,on the northern slope of Mt.Qomolangma,in June 2007.The wind,tem-perature and radiation conditions were measured during the campaign.Using these observation data,together with the National Centers for Environmental Prediction/the National Center for Atmospheric Research (NCEP/NCAR) reanalysis data,the air mass exchange between the inside of the valley and the outside of the valley is quantitatively estimated,based on a closed-valley method.The air mass is strongly injected into the Rongbuk Valley in the after-noon,which dominates the diurnal cycle,by a strong downward along-valley wind,with a maximum down-ward transfer rate of 9.4 cm s?1.The total air volume flux injected into the valley was 2.6×1011 m3 d?1 in 24 hours in June 2007,which is 15 times the total volume of the val-ley.The air mass transfer into the valley also exhibited a clear daily variation during the HEST2007 campaign,which can be affected by the synoptic situations through the adjustment of local radiation conditions.For a better understanding of the air mass exchange processes between the surface and free atmosphere in the Himalayas, a Himalayan exchange between the surface and troposphere 2007 (HEST2007) campaign was carried out in the Rongbuk Valley, on the northern slope of Mt. Qomolangma, in June 2007. The wind, temperature and radiation conditions were measured during the campaign. Using these observation data, together with the National Centers for Environmental Prediction/the National Center for Atmospheric Research (NCEP/NCAR) reanalysis data, the air mass exchange between the inside of the valley and the outside of the valley is quantitatively estimated, based on a closed-valley method. The air mass is strongly injected into the Rongbuk Valley in the afternoon, which dominates the diurnal cycle, by a strong downward along-valley wind, with a maximum downward transfer rate of 9.4 cm s^-1. The total air volume flux injected into the valley was 2.6×10¹¹ m³ d^-1 in 24 hours in June 2007, which is 15 times the total volume of the valley. The air mass transfer into the valley also exhibited a clear daily variation during the HEST2007 campaign, which can be affected by the synoptic situations through the adjustment of local radiation conditions.

关 键 词：air mass exchange quantitative estimation along-valley wind the Himalayas 

分 类 号：P432[天文地球—大气科学及气象学]