Satellite footprint data from OCO-2 and TROPOMI reveal significant spatio-temporal and inter-vegetation type variabilities of solar-induced fluorescence yield in the US Midwest

REMOTE SENSING OF ENVIRONMENT

卷:241

Article

Wang, Cong¹  Guan, Kaiyu^1,2  Peng, Bin^1,2  Chen, Min³  Jiang, Chongya^1,4  Zeng, Yelu⁵  Wu, Genghong¹  Wang, Sheng¹  Wu, Jin⁶  Yang, Xi⁷  Frankenberg, Christian^8,9  Kohler, Philipp⁸  Berry, Joseph⁵  Bernacchi, Carl^4,10,11  Zhu, Kai¹²  Alden, Caroline^13,14  Miao, Guofang¹ 

[1] Univ Illinois, Coll Agr Consumer & Environm Sci, Champaign, IL 61820 USA

[2] Univ Illinois, Natl Ctr Supercomp Applicat, Champaign, IL 61820 USA

[3] Pacific Northwest Natl Lab, Joint Global Change Res Inst, College Pk, MD USA

[4] Univ Illinois, Carl R Woese Inst Genorn Biol, Urbana, IL USA

[5] Carnegie Inst Sci, Dept Global Ecol, Stanford, CA USA

[6] Brookhaven Natl Lab, Dept Environm & Climat Sci, Upton, NY 11973 USA

[7] Univ Virginia, Dept Environm Sci, Clark Hall, Charlottesville, VA 22903 USA

[8] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

[9] CALTECH, Jet Prop Lab, Pasadena, CA USA

[10] Univ Illinois, Dept Plant Biol, Urbana, IL USA

[11] USDA ARS, Global Change & Photosynth Res Unit, Urbana, IL USA

[12] Univ Calif Santa Cruz, Dept Environm Studies, Santa Cruz, CA 95064 USA

[13] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

[14] NOAA, ESRL Global Monitoring Div, Boulder, CO USA

关键词: Solar-induced chlorophyll fluorescence;    OCO-2;    TROPOMI;    Fluorescence yield;    Croplands;    NIRV;    Escaping ratio;   

DOI  :  10.1016/j.rse.2020.111728

来源: Elsevier

【 摘 要 】

Solar-induced chlorophyll fluorescence (SIF) measured from space has been increasingly used to quantify plant photosynthesis at regional and global scales. Apparent canopy SIF yield (SIFyield apparent), determined by fluorescence yield (Phi(F)) and escaping ratio (f(esc)), together with absorbed photosynthetically active radiation (APAR), is crucial in driving spatio-temporal variability of SIF. While strong linkages between SIFyield apparent and plant physiological responses and canopy structure have been suggested, spatio-temporal variability of SIFyield apparent at regional scale remains largely unclear, which limits our understanding of the spatio-temporal variability of SIF and its relationship with photosynthesis. In this study, we utilized recent SIF data with high spatial resolution from two satellite instruments, OCO-2 and TROPOMI, together with multiple other datasets. We estimated SIFyield apparent across space, time, and different vegetation types in the U.S. Midwest during crop growing season (May to September) from 2015 to 2018. We found that SIFyield apparent of croplands was larger than non-croplands during peak season (July-August). However, SIFyield apparent between corn (C4 crop) and soybean (C3 crop) did not show a significant difference. SIFyield apparent of corn, soybean, forest, and grass/pasture show clear seasonal and spatial patterns. The spatial variability of precipitation during the growing season could explain the overall spatial pattern of SIFyield apparent. Further analysis by decomposing SIFyield apparent into Phi(F) and f(esc) using near-infrared reflectance of vegetation (NIRV) suggests that fesc may be the major driver of the observed variability of SIFyield apparent.

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