Published Paper Details:

In this paper, we use GEOS Chem model to simulate the atmosphere surface CO2 concentration Indian region to estimate the regional source and sink of atmospheric CO2. Satellite (GOSAT, OCO-2) and in situ observation are used to estimate CO2 concentration and fluxes. We simulate the two different temporal and spatial resolutions: global (2? x2.5?) and Indian region (0.25? x0.3125?,nested grid) for period of 2013-2019 .The model and in situ comparison has good coherent ,Batul insitu location has 0.89 correlation with Nested model and Sundarbans location has 0.72 correlation with Nested grid location .The regional and global model surface atmospheric CO2 compared with OCO-2 and GOSAT satellite observation over four different regions in the Indian land region .Sensitivity experiment conduct to use Terrestrial biosphere exchange over Indian region and with reginal ,global model and satellite observation . The regional and global and sensitivity model simulations are near surface atmospheric CO2 concentration is compared and get good correction with satellite observation, The analysis has good comparison and time series analysis shows us good coherent with atmospheric surface CO2 with satellite and insitu observation .In the analysis observed seasonal and inter annual variation over four regions of box: North India(Box A) ,South India(Box B) and North east India(Box C) and south west region(Box D). In three model simulation has good agreement with GOSAT and OCO-2 satellite observation ,GOSAT with Nested ,Global and BBIO inserted Nested model simulation Correlation are 0.9,0.88,0.89 and OCO-2 with Nested ,Global and BBIO inserted Nested model simulation Correlation are 0.93,0.89,0.89 . The terrestrial biosphere experiment given good results with regional simulation of CO2 and satellite observation. The mainly effect of seasonal and inter-annual increase depends on terrestrial biosphere.