Base On Ground Based High-resolution Fourier Transform Infrared Spectroscopy To Study Temporal And Spatial Distribution And Variation Characteristics Of Atmospheric CO₂

Due to human activity,global climate change has become a challenge for all mankind.Particularly,the burning of fossil fuels,which leads atmospheric CO2 increase rapidly,exacerbates the global greenhouse effect.Studying the seasonal and annual variation trends and spatial-temporal distribution of atmospheric CO2 are of great significance for understanding and control the greenhouses emission.Due to different sources have different isotopic characteristics,the stable isotope could provide information about the emisssion sources.Therefore,observation stable isotopes of atmospheric CO2 and H2O will be contribute to studying atmospheric carbon cycle and water cycle.Ground-based remote sensing observation has the advantages of high precision and insensitivity to vertical transmission of air mass,and the measurement results with a high sensitivity for near-surface emission.Therefore,base on ground-based remote sensing for observe long-term observation of column concentration and vertical profile of atmospheric CO2 is of great significance for understanding regional carbon emissions and mastering CO2 source and sink information.The study based on ground-based high-resolution Fourier transform spectroscopy(FTIR)to develop new retrieval methods and key technologies for studying spatial-temporal distribution of atmospheric CO2.We use the ground-based high-resolution Fourier transform infrared spectroscopy system to retrieval the total column and vertical profile of atmospheric CO2.Based on the ground-based FTIR observation,we obtain atmospheric CO2 time series about three years.We use CO2 time series to correct the satellite remote sensing result.And also analyze the trends and characteristics about seasonal and annual variation of atmospheric CO2.Combined with the CO observation result,the ratio of CO2 to CO and CO regional emissions are calculated.At last the retrieval method of CO2 and water vapor stable isotope also studied,and analyze the seasonal variation and variation reason about ratio of CO2 and water vapor stable isotope.First,based on the near-infrared solar absorption spectrum that measured by the ground-based high-resolution FTIR to study the retrieval method and parameters setting in the retrieval of atmospheric CO2 total column.The key parameters of spectral retrieval such as the a prior profile,the model parameters,and the spectral win*dow are determined.The instrument line shape(ILS)are mersured and corrected.The method and calculate result of instrument linear line monitoring are described,and the influence of a model parameters in the forward model are analyzed.And the retrieval error is(0.13±0.07)%and retrieval precision is 0.12ppm.We using the three years time series of CO2 total column that retrieval from near-infrared solar spectrum to analyze the atmospheric CO2 daily,seasonal and annual variation characteristics.The annual growth rate is 2.23±0.63 ppm yr-1.Ground-based remote sensing and satellite remote sensing data comparison methods is analyzed,and using GOSAT data to compare with ground CO2 data,and the correlation coefficient between GOSAT and FTS results is 0.85.The enhancement slopes of ACO to ?CO2 were calculated and compared from ground-based remote sensing observations,surface in-situ measurements,satellite observation and emission inventory data at the Hefei site.Both inventory based ratios of ?CO to ?CO2 are significantly larger than the ratios based on the observation data.Further the regional CO emissions were estimated from the enhancement slopes of ACO/?CO2 combined with the CO2 emission inventory.The phenomenon suggests that the emission inventories greatly overestimate the actual CO emission in the study area.We also based on the mid-infrared solar absorption spectrum that measured by the ground-based high-resolution FTIR to study atmospheric CO2 vertical profiles retrieval strategies in mid-infrared region.And given the retrieval error budget from different parameters and calculated the retrieval sensitivity in different height.And the total retrieval error is 7.67%.We also analyze the distribution characteristics of CO2 vertical profile,and compare the CO2 results that measured from mid-infrared and near-infrared.At last,using near-infrared solar absorption spectra collected by the ground-based FTIR to retrieval the stable isotopes of atmospheric CO2 and water vapor method.And parameters setting are analyzed.The isotope retrieval error and isotope ratio observation precision are analyzed.And then the stable isotope ratios of CO2 and water vapor long-time series variation characteristics are analyzed,and the relationships of meteorological parameters with stable isotopologue were also analyzed.Further,main potential sources of 8D and the ?D values of evapotranspiration over the observation period also calculated.The experiment results demonstrate the ability of the ground-based high-resolution FTIR to detect the CO2 vertical total column and profile with a high precision and accuracy.It also provides reliable ground-based observations for comparing with satellite observations,and also provide reliable ground-based data for studying the spatial and temporal distribution,changing characteristics,regional emissions,and understanding source and sink distributions of greenhouse gases.