[Atmospheric CH4 concentrations and the correlation between CH4 and CO concentrations].
Methane (CH4) is an important greenhouse gas and a key molecule in tropospheric photochemistry, some more potent than CO2. The remote-sensing experiments of CH4 were carried out in the fall of 2 000 in Beijng. The 6-day records of the atmospheric CH4 concentrations were examined by means of a time-series analysis using a fast Fourier transform with a low-pass filter to elucidate the seasonal cycles and the long-term trends. The variation in the long-time trends of the CH4 concentrations in Beijing may be ascribed to the emission changes in the CH4 sources due to the human activities such as waste dumping and landfills and the emission from motor vehicles. The correlation between the CH4 and CO concentrations was analyzed.
Wei
Xiu-Li
XL
Chinese Academy of Sciences, Anhui Institute of Optics and Fine Machanics, Hefei 230031, China. xlwei@aiofm.ac.cn
Lu
Yi-Huai
YH
Gao
Min-Guang
MG
Liu
Jian-Guo
JG
Liu
Wen-Qing
WQ
Xu
Liang
L
Zhang
Tian-Shu
TS
Zhu
Jun
J
Chen
Jun
J