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Published:07 June 2020
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The atmospheric carbon dioxide (CO
2
) concentration has increased to more than 405 parts per million (ppm) in 2017 due to human activities such as deforestation
land-use change and burning of fossil fuels. Although there is broad scientific consensus on the damaging consequences of the change in climate associated with increasing concentrations of greenhouse gases
fossil CO
2
emissions have continued to increase in recent years mainly from rapidly developing economies and China is now the largest emitter of CO
2
generating about 30% of all emissions globally. To allow more reliable forecast of the future state of the carbon cycle and to support the efforts for mitigation greenhouse gas emissions
a better understanding of the global and regional carbon budget is needed. Space-based measurements of CO
2
can provide the necessary observations with dense coverage and sampling to provide improved constrains on of carbon fluxes and emissions. The Chinese Global Carbon Dioxide Monitoring Scientific Experimental Satellite (TanSat) was established by the National High Technology Research and Development Program of China with the main objective of monitoring atmospheric CO
2
and CO
2
fluxes at the regional and global scale. TanSat has been successfully launched in December 2016 and as part of the Dragon programme of ESA and the Ministry of Science and Technology (MOST)
a team of researchers from Europe (UK and Finland) and China has evaluated early TanSat data and contrast it against data from the GOSAT mission and models. In this manuscript
we report on retrieval intercomparisons of TanSat data using two different retrieval algorithms
on validation efforts for the Eastern Asia region using GOSAT CO
2
data and first assessments of TanSat and GOSAT CO
2
data against model calculations using the GEOS-Chem model.
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