Analysis Of Atmospheric CO₂ Characteristics And Source And Sink In China

In recent years,the accumulation of greenhouse gases has increased in the atmospheric environment,causing many environmental problems and potential hazards.CO₂,as one of the main greenhouse gases,its large increase is closely related to people's activities.In order to reduce carbon emissions,many scientists are working hard to establish a CO₂ monitoring network to study the temporal and spatial distribution of CO₂ and its driving factors.At present,there are not only GAW atmospheric monitoring stations worldwide,but also observation platforms established by TCCON.In addition,there are satellite-borne hyperspectral greenhouse gas monitoring satellites.Currently,the operating greenhouse gas monitoring satellites,GOSAT,GOSAT-2,OCO-2,and Tansat,provide us with high-precision data products.In this paper,we mainly take the Waliguan,Shangdianzi,Kings Park and Lulin as the research objects,and obtain the GOSAT and OCO-2 satellite data in the area of the Waliguan atmospheric background station to verify the accuracy of the satellite data.Through the data of Hong Kong Tsurui Station,the data of each station is verified,and the trend of CO₂ in China is the trend of seasonal fluctuation.Obtain data on carbon sources and carbon sinks from the perspective of carbon cycle and simulation data from Carbon Tracker.Analysis of the variation of carbon source and carbon sink in the atmospheric background station with the seasons.The Carbon Tracker simulation data is then verified using carbon source and carbon sink data.Conclusions were as below:?1?Analyzed the correlation analysis between the satellite data and the ground monitoring data,and found that the correlation coefficient between satellite data and ground monitoring data was 0.482,and the correlation coefficient between the two sets of ground observation data was as high as 0.981.?2?By comparing the four sites changes of CO₂ with the seasons year by year,found that the changes of CO₂ and the CO₂ away from the residential area were stable with the seasons.The peaks appeared in the spring and the troughs appeared in the summer.SDZ and HKO were affected by urban residential areas and had irregular distribution.Through the data verification of the four ground station areas in Hong Kong Tsurui Station data,the characteristics of CO₂ concentration in China vary with the season.?3?Comparing and analyzing the carbon sources of the four atmospheric background stations,found that among the three elements of BB,NPP and Rh in bio-flux,the basic laws of NPP and Rh change with time,they reached the peak from January to summer.8,9 and then gradually decreased.The bio-flux basically conforms to the carbon sink area from May to September,and the remaining months are the distribution characteristics of the carbon source area.The minimum values of HKO,SDZ,and WLG stations of ff-flux appear in January,and the maximum value appears in December.The maximum value of the LIN base station appears in February,and the minimum value appears in May.The four-station Fire-flux maximum appears basically in the fall of September.?4?In the process of Carbon Tracker simulation data verification,the correlation of bio-flux curve was poor,with a correlation of 0.5869.The f-flux curve had a good correlation,the correlation maximum was 0.9785,and the minimum valuewas0.6361.The correlation of the fier-flux curve is good,with a correlation from maximum 0.8124,to minimum 0.6824.