Preflight diffuser's calibration of carbon dioxide spectrometer of TanSat

Long, 王龙 Wang; Chao, 蔺 超 Lin; Zhen-hua, 纪振华 Ji; Yu-quan, 郑玉权 Zheng; Yan-meng, 毕研盟 BI

doi:10.3788/ope.20182608.1967

光学精密工程

2018

DOI: 10.3788/ope.20182608.1967

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Preflight diffuser's calibration of carbon dioxide spectrometer of TanSat

王龙 Wang Long¹,

蔺超 Lin Chao²,

纪振华 Ji Zhen-hua³

et al.

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2020

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“…The TanSat mission is the 3rd mission launched that has the capability to provide CO 2 space-based measurements. The CO 2 instrument, the atmospheric carbon dioxide grating spectrometer, measures backscattered sunlight (Wang et al, 2018) in two CO 2 bands at 1.61 and 2.06 μm respectively. In addition, a 0.76 μm oxygen A-band channel is on-broad in order to correct the light path modification by atmospheric scattering from aerosols and thin clouds (Chen et al, 2017).…”

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A New TanSat XCO2 Global Product towards Climate Studies

et al. 2020

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A New TanSat XCO2 Global Product towards Climate Studies

et al. 2020

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Toward High Precision XCO₂Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements

et al. 2020

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TanSat is the 1st Chinese carbon dioxide (CO 2) measurement satellite, launched in 2016. In this study, the University of Leicester Full Physics (UoL-FP) algorithm is implemented for TanSat nadir mode XCO 2 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 CO 2 weak band retrieval to a combined O 2 A and CO 2 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 XCO 2 retrieval error. Twenty sites of the Total Column Carbon Observing Network (TCCON) have been selected to validate our new approach for the TanSat XCO 2 retrieval. We show that our new approach produces a significant improvement on the XCO 2 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 XCO 2 retrieval from TanSat and subsequently the Level-2 data production, and hence will be applied in the TanSat operational XCO 2 processing.

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Preflight diffuser's calibration of carbon dioxide spectrometer of TanSat

Cited by 2 publications

References 0 publications

A New TanSat XCO2 Global Product towards Climate Studies

A New TanSat XCO2 Global Product towards Climate Studies

Toward High Precision XCO₂Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements

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Preflight diffuser's calibration of carbon dioxide spectrometer of TanSat

Cited by 2 publications

References 0 publications

A New TanSat XCO2 Global Product towards Climate Studies

A New TanSat XCO2 Global Product towards Climate Studies

Toward High Precision XCO2Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements

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Toward High Precision XCO₂Retrievals From TanSat Observations: Retrieval Improvement and Validation Against TCCON Measurements