title: Temporal variations of CO2 concentration near land surface and its response to meteorological variables in Heihe River Basin, northwest China.
abstract: Atmospheric CO2 concentration (CC) near land surface and meteorological variables have been measured at four sites, named Yeniugou (alpine meadow and permafrost), Xishui (mountainous forest), Linze (oasis edge) and Ejina (lower desert), respectively, in Heihe River Basin, northwest China. The results showed that, the half hourly CC at night was larger than in daytime, and the daily averaged CC was the largest in winter. The averaged CC of 932 d at the Linze was about 418 ppm, was about 366 ppm in the 762 d at the Ejina. In the same period from September 23 to November 9, 2004, the averaged CC was about 625, 334, 436 and 353 ppm, at Yeniugou, Xishui, Linze and Ejina, respectively. The linear relationship between daily averaged CC and air temperature T was negative, between CC and relative humidity (RH) was positive. The linear CC-atmospheric pressure (AP) relationship was negative at the Linze and Yeniugou, was positive at the Ejina. The relationship between CC and global radiation R was exponent, and soil temperature Ts was negative linear, and soil water content was complex. The correlation between CC and wind speed was not existent. Using meteorological variables together to simulate CC, could give good results.
authors.affiliation: Laboratory of Watershed Hydrology and Ecology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou. crs2008@ns.lzb.ac.cn
authors.forename: Ren-sheng
authors.initials: RS
authors.lastname: Chen
authors.forename: Er-si
authors.initials: ES
authors.lastname: Kang
authors.forename: Xi-bin
authors.initials: XB
authors.lastname: Ji
authors.forename: Jian-ping
authors.initials: JP
authors.lastname: Yang
authors.forename: Zhi-hui
authors.initials: ZH
authors.lastname: Zhang
authors.forename: Yong
authors.initials: Y
authors.lastname: Yang
mesh_terms: D000388:Air / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods*; D012621:Seasons; D013696:Temperature
chemical_list: D002245:Carbon Dioxide