Preprints
https://doi.org/10.5194/amt-2021-66
https://doi.org/10.5194/amt-2021-66

  27 Sep 2021

27 Sep 2021

Review status: this preprint is currently under review for the journal AMT.

Retrieval of Solar-induced Chlorophyll Fluorescence from TanSat Measurements: Comparison of SIF between TanSat and OCO-2

Lu Yao1,2, Yi Liu1,3, Dongxu Yang1,3, Zhaonan Cai1, Chao Lin4, Naimeng Lu5, Daren Lyu1, Longfei Tian6, Jing Wang1, Maohua Wang3, Zengshan Yin6, Yuquan Zheng4, and Sisi Wang7 Lu Yao et al.
  • 1Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, No. 40, Huayan Li, Chaoyang District, Beijing 100029, China
  • 2University of Chinese Academy of Sciences, No. 19A, Yuquan Lu, Shijing Shan District, Beijing 100049, China
  • 3Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
  • 4Changchun Institute of Optics, Fine Mechanics and Physics, Changchun 130033, China
  • 5National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China
  • 6Shanghai Engineering Center for Microsatellites, Shanghai 201203, China
  • 7National Remote Sensing Center of China, Beijing 100036, China

Abstract. Solar-induced chlorophyll fluorescence (SIF) is emitted during photosynthesis in plant leaves. It constitutes a small additional offset to reflected radiance and can be observed by sensitive instruments. The Chinese global carbon dioxide monitoring satellite (TanSat), as its mission, acquires greenhouse gas column density. The advanced technical characteristics of the hyper-spectrum grating spectrometer (ACGS) onboard TanSat enable SIF retrieval from space observations in the O2-A band. In this study, one-year SIF data was processed from Orbiting Carbon Observatory-2 (OCO-2) and TanSat using a physical-based algorithm. A comparison between the SIF retrieved from OCO-2 and its official product shows their strong linear relationship (R2 > 0.85) and suggests the reliability of the algorithm. The global distribution showed that the SIF retrieved from the two satellites shared the same spatial pattern for all seasons with the grided SIF difference less than 0.3 W m−2 μm−1 sr−1, and they also agreed with the official OCO-2 SIF product. The retrieval uncertainty of seasonal-grided TanSat SIF is less than 0.03 W m−2 μm−1 sr−1 whereas the uncertainty of each sounding ranges from 0.1 to 0.6 W m−2 μm−1 sr−1. The relationship between SIF and terrestrial gross primary productivity was also estimated for data quality testing. The spatiotemporal consistency between TanSat and OCO-2 and their comparable data quality make the comprehensive usage of the two mission products possible. Data supplemented by TanSat observations are expected to contribute to the development of global SIF maps with more spatiotemporal detail, which will advance global research on vegetation photosynthesis.

Lu Yao et al.

Status: open (until 02 Nov 2021)

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Lu Yao et al.

Lu Yao et al.

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Short summary
A physical-based SIF retrieval algorithm is introduced and it was applied to OCO-2 and TanSat measurements. The retrieved OCO-2 SIF data and its official product have a strong linear relationship, indicating the reliability of the algorithm. The good consistency in spatial-temporal patterns and magnitude of OCO-2 and TanSat SIF product suggests that the combinative usage of multi-satellite products is possible and such work would contribute to further researches.