The impact of the 2015/2016 El Niño on global photosynthesis using satellite remote sensing

Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B.; Jiménez-Muñoz, Juan-Carlos; Chen, Jing M.; Jiang, Chongya; Ju, Weimin; Perakalapudi, Naga-Vineet; Ryu, Youngryel; Tadić, Jovan M.

doi:10.1098/rstb.2017.0409

Title: The impact of the 2015/2016 El Niño on global photosynthesis using satellite remote sensing

Journal Article · 07 October 2018 · Philosophical Transactions of the Royal Society of London, Series B: Biological Sciences

DOI: https://doi.org/10.1098/rstb.2017.0409 · OSTI ID:1542327

^[1]; Keenan, Trevor F. ^[1]; Fisher, Joshua B. ^[2];

^[3]; Chen, Jing M. ^[4]; Jiang, Chongya ^[5]; Ju, Weimin ^[6]; Perakalapudi, Naga-Vineet ^[2]; Ryu, Youngryel ^[5]; Tadić, Jovan M. ^[7]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Jet Propulsion Lab.
Univ. of Valencia (Spain)
Univ. of Toronto, ON (Canada)
Seoul National Univ., Seoul (Republic of Korea)
Nanjing Univ. (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The El Niño-Southern Oscillation exerts a large influence on global climate regimes and on the global carbon cycle. Although El Niño is known to be associated with a reduction of the global total land carbon sink, results based on prognostic models or measurements disagree over the relative contribution of photosynthesis to the reduced sink. Here, we provide an independent remote sensing-based analysis on the impact of the 2015-2016 El Niño on global photosynthesis using six global satellite-based photosynthesis products and a global solar-induced fluorescence (SIF) dataset. An ensemble of satellite-based photosynthesis products showed a negative anomaly of -0.7 ± 1.2 PgC in 2015, but a slight positive anomaly of 0.05 ± 0.89 PgC in 2016, which when combined with observations of the growth rate of atmospheric carbon dioxide concentrations suggests that the reduction of the land residual sink was likely dominated by photosynthesis in 2015 but by respiration in 2016. The six satellite-based products unanimously identified a major photosynthesis reduction of -1.1 ± 0.52 PgC from savannahs in 2015 and 2016, followed by a highly uncertain reduction of -0.22 ± 0.98 PgC from rainforests. Vegetation in the Northern Hemisphere enhanced photosynthesis before and after the peak El Niño, especially in grasslands (0.33 ± 0.13 PgC). The patterns of satellite-based photosynthesis ensemble mean were corroborated by SIF, except in rainforests and South America, where the anomalies of satellite-based photosynthesis products also diverged the most. We found the inter-model variation of photosynthesis estimates was strongly related to the discrepancy between moisture forcings for models. These results highlight the importance of considering multiple photosynthesis proxies when assessing responses to climatic anomalies.This article is part of a discussion meeting issue 'The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications'.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1542327

Journal Information:: Philosophical Transactions of the Royal Society of London, Series B: Biological Sciences, Journal Name: Philosophical Transactions of the Royal Society of London, Series B: Biological Sciences Journal Issue: 1760 Vol. 373; ISSN 0962-8436

Publisher:: The Royal Society PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Figure S3 from The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.7076834 The current record is supplemented by this image	image	January 2018
Figure S3 from The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.7076834.v1 The current record is supplemented by this image	image	January 2018
Figure S1 from The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.7076837 The current record is supplemented by this image	image	January 2018
Figure S1 from The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.7076837.v1 The current record is supplemented by this image	image	January 2018
Figure S2 from The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.7076840 The current record is supplemented by this image	image	January 2018
Figure S2 from The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.7076840.v1 The current record is supplemented by this image	image	January 2018
Figure S4 from The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.7076843 The current record is supplemented by this image	image	January 2018
Figure S4 from The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.7076843.v1 The current record is supplemented by this image	image	January 2018
Supplementary material from "The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing" Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.c.4229402 The current record is supplemented by this collection	collection	January 2018
Supplementary material from "The impact of the 2015–2016 El Niño on global photosynthesis using satellite remote sensing" Luo, Xiangzhong; Keenan, Trevor F.; Fisher, Joshua B. https://doi.org/10.6084/m9.figshare.c.4229402.v1 The current record is supplemented by this collection	collection	January 2018