Observation And Inversion Of The Main Greenhouse Gas Column Concentration In Typical Areas

The absorption of long wave radiation by low content greenhouse gases,such as H2O,CO2,CH4 and CO.Greenhouse gases not only directly affect infrared radiation transmission,but also one of the main factors leading to global warming.Compared with the satellite observation and airborne observation,ground-based observation has high sensitivity,high accuracy and continuous measurement,which is the most intuitive and effective observation method for greenhouse gas concentration observation,and widely used in the study of greenhouse gas concentration around the world.The total carbon column observation network(TCCON)is a global observation network which uses the ground-based Fourier transform spectrometer to observe the concentration of greenhouse gases for a long time.The FTIR125HR built in Hefei Science Island is the only candidate site of TCCON in China.Therefore,in this paper,the observation of high-precision solar absorption spectrum and simultaneous inversion of greenhouse gas column concentrations are carried out by using EM27/SUN combined with the optimal estimation algorithm.The spatial-temporal distribution and regional emission characteristics of greenhouse gas column concentration at typical stations were obtained,and compared with satellite data,model model and other observation data.In order to provide effective data support and theoretical basis for the source and sink research of greenhouse gases and the engineering application of photoelectric system in China.The main research work and innovative achievements are as follows.(1)The sensitivity of parameters for the inversion of greenhouse gas column concentration was studied.The quantitative results of the influence of the linear function of the EM27/SUN,the surface pressure,the tropopause height,the temperature,the pressure and the prior profile of the target inversion gas on the column concentration inversion are obtained.(2)The high-precision solar absorption spectrum was observed by Fourier transform spectrometer.Simultaneous inversion of four main greenhouse gas column concentrations of H2O,CO2,CH4 and CO with the optimal estimation algorithm.The spatial-temporal distribution and regional emission characteristics of column concentrations at four typical stations were obtained.(3)Based on the ground observation data and the column concentration inversion results,a comparative analysis is carried out with the observation data of GOSAT satellite,WACCM model and Laser Heterodyne spectrum technology.The back trajector model hysplit was used to analyze the characteristics of airflow transport,and the characteristic data of the main greenhouse gas sources and sinks at four typical stations were obtained.(4)Based on the radiative transfer model,combined with the ground observation and inversion data,the influence of the daily variation characteristics of greenhouse gas concentration on the atmospheric transfer efficiency of the whole layer is analyzed,and the quantitative results of the influence of H2O and CO2 concentration on the atmospheric transmission efficiency of the whole layer are obtained.The results can provide theoretical basis and data support for simultaneous inversion of various greenhouse gas concentrations by ground-based Fourier transform spectrometer.It provides theoretical basis and data support for the study of greenhouse gas sources and sinks in subtropical monsoon climate,warm temperate arid climate,plateau temperate semi-arid monsoon climate and subtropical monsoon humid climate in China.It also provides the key data for the research of laser atmospheric transmission and infrared radiation transmission.