Comment on "Recent global decline of CO₂ fertilization effects on vegetation photosynthesis"

Creators: Frankenberg, Christian; Yin, Yi; Byrne, Brendan; He, Liyin; Gentine, Pierre

Abstract

Wang et al. (Research Articles, 11 December 2020, p. 1295), using photosynthesis proxies from long-term satellite records, report a significant decline in CO₂ fertilization effects. We find that small systematic biases in Advanced Very High Resolution Radiometer (AVHRR) data affect their analysis to the degree that the key finding is not robust. Caution is recommended when using AVHRR to detect changes in near-infrared reflectance of vegetation (NIRv) trends and vegetation indices.

Additional Information

© 2021 American Association for the Advancement of Science. Publication date: 24 September 2021. Supported by NASA grants 80NSSC18K0895 and 80NSSC19M0129 (C.F., L.H., and Y.Y.) and NASA OCO2/3 science team program NNH17ZDA001N-OCO2 (B.B.). B.B.'s research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Our analysis code and supplementary figures are available at http://dx.doi.org/10.22002/D1.1976.

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Resource type: Journal Article
Publisher: American Association for the Advancement of Science
Published in: Science, 373(6562), Art. No. abg2947, ISSN: 0036-8075.