Occurrence and Discrepancy of Surface and Column Mole Fractions of CO2 and CH4 at a Desert Site in Dunhuang, Western China

被引:3
作者
Wei, Chong [1 ]
Lyu, Zheng [1 ]
Bu, Lingbing [2 ]
Liu, Jiqiao [3 ]
机构
[1] Chinese Acad Sci, Shanghai Carbon Data Res Ctr, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China
[2] Nanjing Univ Informat Sci & Technol NUIST, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Key Lab Aerosol Cloud Precipitat China Meteorol A, Key Lab Meteorol Disasters,Minist Educ, Nanjing 210044, Peoples R China
[3] Chinese Acad Sci, Key Lab Space Laser Commun & Detect Technol, Shanghai Inst Opt & Fine Mech, Shanghai 201800, Peoples R China
基金
中国国家自然科学基金;
关键词
greenhouse gases; column mole fractions; satellite; Gobi Desert; temporal variation; meteorological conditions; MISSING OH SOURCE; HO2; CONCENTRATIONS; GREENHOUSE GASES; CARBON-DIOXIDE; XCO2; PERFORMANCE; EMISSION; COCCON; XCH4; CALIBRATION;
D O I
10.3390/atmos13040571
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Carbon dioxide (CO2) and methane (CH4) are the two major radiative forcing factors of greenhouse gases. In this study, surface and column mole fractions of CO2 and CH4 were first measured at a desert site in Dunhuang, west China. The average column mole fractions of CO2 (XCO2) and CH4 (XCH4) were 413.00 +/- 1.09 ppm and 1876 +/- 6 ppb, respectively, which were 0.90 ppm and 72 ppb lower than their surface values. Diurnal XCO2 showed a sinusoidal mode, while XCH4 appeared as a unimodal distribution. Ground observed XCO2 and XCH4 were compared with international satellites, such as GOSAT, GOSAT-2, OCO-2, OCO-3, and Sentinel-5P. The differences between satellites and EM27/SUN observations were 0.26% for XCO2 and -0.38% for XCH4, suggesting a good consistency between different satellites and ground observations in desert regions in China. Hourly XCO2 was close to surface CO2 mole fractions, but XCH4 appeared to have a large gap with CH4, probably because of the additional chemical removals of CH4 in the upper atmosphere. It is necessary to carry out a long-term observation of column mole fractions of greenhouse gases in the future to obtain their temporal distributions as well as the differences between satellites and ground observations.
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页数:17
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