Temporal And Spatial Distribution Of Column Vertical Density And Emissions Of Methane In China

Because the climate is close to the survival and development of human, in recent year the research of climate change has become a topical issue. With the further human activities and the increasingly prominent effect of climate change by human factors, the depthn exploration impact of climate change from the emissions of greenhouse gases by human activities is a hot topic. The methane as one of the most important greenhouse gases besides carbon dioxide is getting more and more widespread attention.At present, countries have issued corresponding policy on climate change, including the control of greenhouse gas emissions which is brought up as a crucial task. China, as one of the greenhouse gas emissions powers, requires accurate basic data for formulating emission reduction policies and their implementation. So it is very important to investigate the time-space distribution about the methane density of China atmosphere.With the data from Waliguan site, which is the only global atmospheric background station in China, our study obtains the law of the Chinese methane density in atmospheric background field. The conclusion is that around this area the density of the methane is growing all the time, but it is different from the global average seasonal change. The density of the methane in summer is higher than in winter, and the rangeability there is smaller than the same latitudes. All of these are related to the seasonal variation of source and sink there.The data of methane column vertical density provided by Bremen University through the WMF-DOSA method inverted from SCIAMACHY sensor can be a very good performance of distribution of methane sources in the troposphere. Using Ordinary Kriging interception, three years of monthly distribution of CH4 vertical colume density of China were obtained.The change of comprehensive function in the source and sink about our methane column vertical density over time is come by through the study of methane distribution in the space-time. Our study gets the differences between the country's spatial distribution of the vertical column density and the concentration distribution of the atmospheric methane through the analysis of the Chinese methane grid and regional distribution. The conclusion is that the maximum value appears at the junctional place of Sichuan, Chongqing, Guizhou and Yunnan provinces and the lowest in the Qinghai-tibet plateau area. Judging from the year-round situation the highest column concentration value of the methane appears in July, August and September and the lowest appears in November, January and February in China.Combined the statistics of National bureau, according to the guide list of greenhouse gases provided by the IPCC, our study systematically estimate anthropogenic sources with a method that is suitable to Chinese emissions and study from three parts including energy utilization, agricultural activities and waste disposal in 2000-2007. The estimated results show that our methane emissions are growing over time except a slightly decrease in 2007. Among the three components the proportion of energy emissions has been increasing. The regional differences among all provinces emissions are obvious which present in provinces'variation such as economic condition, natural environment. Not only the methane emissions but also the configuration of the emissions sources are quite different. The area can be devided into energy utilization, agricultural activity and waste disposal according to the sources of emissions. The statistical results of the methane emissions of unit area in China show that the density distribution of methane emissions presents higher in west and lower in the east.