Affiliations: Laboratory of Watershed Hydrology and Ecology, Cold
and Arid Regions Environmental and Engineering Research Institute, Chinese
Academy of Sciences, Lanzhou 730000, China
Abstract: Atmospheric CO_2 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 (A P) 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
T_s 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.
Keywords: CO[TeX:] _2 concentration, meteorological variables, Heihe River Basin