Toward High Precision XCO2 Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements,Journal of Geophysical Research: Atmospheres

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Toward High Precision XCO2 Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements
Journal of Geophysical Research: Atmospheres ( IF 3.8 ) Pub Date : 2020-10-05 , DOI: 10.1029/2020jd032794
D Yang _{1,

2,

3} , H Boesch _{1,

4} , Y Liu _{2,

3} , P Somkuti _{1,

4,

5} , Z Cai ₂ , X Chen ₂ , A Di Noia _{1,

4} , C Lin ₆ , N Lu ₇ , D Lyu ₂ , R J Parker _{1,

4} , L Tian ₈ , M Wang ₃ , A Webb _{1,

4} , L Yao ₂ , Z Yin ₈ , Y Zheng ₆ , N M Deutscher ₉ , D W T Griffith ₉ , F Hase ₁₀ , R Kivi ₁₁ , I Morino ₁₂ , J Notholt ₁₃ , H Ohyama ₁₂ , D F Pollard ₁₄ , K Shiomi ₁₅ , R Sussmann ₁₀ , Y Té ₁₆ , V A Velazco ₉ , T Warneke ₁₃ , D Wunch ₁₇

Affiliation

Earth Observation Science, School of Physics and Astronomy University of Leicester UK.
Institute of Atmospheric Physics Chinese Academy of Sciences China.
Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai China.
National Centre for Earth Observation University of Leicester UK.
Colorado State University Fort Collins CO USA.
Changchun Institute of Optics, Fine Mechanics and Physics China.
National Satellite Meteorological Center, China Meteorological Administration China.
Shanghai Engineering Center for Microsatellites China.
Centre for Atmospheric Chemistry, School of Earth, Atmospheric and Life Sciences University of Wollongong NSW Australia.
Karlsruhe Institute of Technology, IMK-IFU Garmisch-Partenkirchen Germany.
Space and Earth Observation Centre Finnish Meteorological Institute Finland.
National Institute for Environmental Studies (NIES) Tsukuba Ibaraki Japan.
Institute of Environmental Physics (IUP) University of Bremen Bremen Germany.
National Institute of Water and Atmospheric Research Ltd (NIWA) Lauder New Zealand.
Japan Aerospace Exploration Agency Japan.
Laboratoire d'Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères (LERMA-IPSL) Sorbonne Université, CNRS, Observatoire de Paris, PSL Université Paris France.
University of Toronto Canada.

TanSat is the 1st Chinese carbon dioxide (CO₂) measurement satellite, launched in 2016. In this study, the University of Leicester Full Physics (UoL‐FP) algorithm is implemented for TanSat nadir mode XCO₂ retrievals. We develop a spectrum correction method to reduce the retrieval errors by the online fitting of an 8^th order Fourier series. The spectrum‐correction model and its a priori parameters are developed by analyzing the solar calibration measurement. This correction provides a significant improvement to the O₂ A band retrieval. Accordingly, we extend the previous TanSat single CO₂ weak band retrieval to a combined O₂ A and CO₂ weak band retrieval. A Genetic Algorithm (GA) has been applied to determine the threshold values of post‐screening filters. In total, 18.3% of the retrieved data is identified as high quality compared to the original measurements. The same quality control parameters have been used in a footprint independent multiple linear regression bias correction due to the strong correlation with the XCO₂ retrieval error. Twenty sites of the Total Column Carbon Observing Network (TCCON) have been selected to validate our new approach for the TanSat XCO₂ retrieval. We show that our new approach produces a significant improvement on the XCO₂ retrieval accuracy and precision when compared to TCCON with an average bias and RMSE of −0.08 ppm and 1.47 ppm, respectively. The methods used in this study can help to improve the XCO₂ retrieval from TanSat and subsequently the Level‐2 data production, and hence will be applied in the TanSat operational XCO₂ processing.

更新日期：2020-11-12

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