Observed and simulated features of the CO_2 diurnal cycle in the boundary layer at Beijing and Hefei,China

作     者：Yinan Wang Daren L Qian Li Minzheng Duan Fei Hu Shunxing Hu 

作者机构：Laboratory of Middle Atmosphere and Global Environment ObservationInstitute of Atmospheric PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences Laboratory of Atmospheric Boundary Layer and Atmospheric ChemistryInstitute of Atmospheric PhysicsChinese Academy of Sciences Anhui Institute of Optics and Fine MechanicsChinese Academy of Sciences 

出 版 物：《Chinese Science Bulletin》 (Chin. Sci. Bull.)

年 卷 期：2014年第59卷第14期

页      面：1529-1535页

核心收录：

学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 

基　　金：supported by the Strategic Priority Research Program-Climate Change:Carbon Budget and Relevant Issues of the Chinese Academy of Sciences (XDA05040000) the National Natural Science Foundation of China (41005023 and 41275046) 

主　　题：地球观测系统 CO2浓度 模拟功能 边界层 昼夜 合肥 北京 周期 

摘      要：The mechanism of the CO2diurnal cycle is a basis for investigating the carbon budget and its impacts on climate and environment *** diurnal variations in CO2concentration based on observations and modeling have been studied ***,few studies have focused on the pattern of the CO2diurnal cycle in *** this study,a three-dimensional global chemical transport model,Goddard Earth Observing System(GEOS)-Chem,was applied to simulate the CO2concentration and its variation over China from 2004 to ***,we also analyzed the CO2concentration as observed by two eddy covariance flux observation towers,one located in Beijing(39°580N,116°220E)and one in Hefei(31°550N,117°100E),using LI-COR 7500A infrared gas *** showed the amplitude of the CO2diurnal cycle at Hefei to be larger than at Beijing,due to stronger ecological ***-Chem successfully captured the main aspects of the diurnal cycle of the CO2concentration in the boundary layer observed at both Beijing and ***,some discrepancies between the model and observations did exist;specifically,the model tended to underestimate the amplitude of the CO2diurnal *** data also showed that traffic emissions significantly enhanced the CO2concentration in the boundary layer.