Toward High Precision XCO2 Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements

doi:10.1029/2020jd032794

CORC > 长春光学精密机械与物理研究所 > 中国科学院长春光学精密机械与物理研究所

	Toward High Precision XCO2 Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements
	D. Yang; H. Boesch; Y. Liu; P. Somkuti; Z. Cai; X. Chen; A. Di Noia; C. Lin; N. Lu; D. Lyu
刊名	Journal of Geophysical Research-Atmospheres
	2020
卷号	125 期号:22 页码:26
ISSN号	2169-897X
DOI	10.1029/2020jd032794
英文摘要	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 O-2 A band retrieval. Accordingly, we extend the previous TanSat single CO2 weak band retrieval to a combined O-2 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.
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语种	英语
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/64973]
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	D. Yang,H. Boesch,Y. Liu,et al. Toward High Precision XCO2 Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements[J]. Journal of Geophysical Research-Atmospheres,2020,125(22):26.
APA	D. Yang.,H. Boesch.,Y. Liu.,P. Somkuti.,Z. Cai.,...&T. Warneke and D. Wunch.(2020).Toward High Precision XCO2 Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements.Journal of Geophysical Research-Atmospheres,125(22),26.
MLA	D. Yang,et al."Toward High Precision XCO2 Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements".Journal of Geophysical Research-Atmospheres 125.22(2020):26.