Enhanced North American carbon uptake associated with El Niño

Hu, Lei; Andrews, Arlyn E.; Thoning, Kirk W.; Sweeney, Colm; Miller, John B.; Michalak, Anna M.; Dlugokencky, Ed; Tans, Pieter P.; Shiga, Yoichi P.; Mountain, Marikate; Nehrkorn, Thomas; Montzka, Stephen A.; McKain, Kathryn; Kofler, Jonathan; Trudeau, Michael; Michel, Sylvia E.; Biraud, Sébastien C.; Fischer, Marc L.; Worthy, Doug E.  J.; Vaughn, Bruce H.; White, James W.  C.; Yadav, Vineet; Basu, Sourish; van der Velde, Ivar R.

doi:10.1126/sciadv.aaw0076

Title: Enhanced North American carbon uptake associated with El Niño

Journal Article · 05 June 2019 · Science Advances

DOI: https://doi.org/10.1126/sciadv.aaw0076 · OSTI ID:1559226

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^[3]; Dlugokencky, Ed ^[2];

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^[2]; McKain, Kathryn ^[1]; Kofler, Jonathan ^[1]; Trudeau, Michael ^[1]; Michel, Sylvia E. ^[6];

^[7]; Fischer, Marc L. ^[7]; Worthy, Doug E. J. ^[8];

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Univ. of Colorado, Boulder, CO (United States); National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). Earth System Research Lab.
National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). Earth System Research Lab.
Carnegie Inst. of Science, Stanford, CA (United States); Stanford Univ., CA (United States)
Carnegie Inst. of Science, Stanford, CA (United States)
Atmospheric and Environmental Research, Lexington, MA (United States)
Univ. of Colorado, Boulder, CO (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Environment and Climate Change Canada, Toronto, ON (Canada)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Univ. of Colorado, Boulder, CO (United States); National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). Earth System Research Lab.; Vrije Univ., Amsterdam (Netherlands)

Long-term atmospheric CO₂mole fraction and δ¹³CO₂ observations over North America document persistent responses to the El Niño–Southern Oscillation. We estimate these responses corresponded to 0.61 (0.45 to 0.79) PgC year^–1 more North American carbon uptake during El Niño than during La Niña between 2007 and 2015, partially offsetting increases of net tropical biosphere-to-atmosphere carbon flux around El Niño. Anomalies in derived North American net ecosystem exchange (NEE) display strong but opposite correlations with surface air temperature between seasons, while their correlation with water availability was more constant throughout the year, such that water availability is the dominant control on annual NEE variability over North America. These results suggest that increased water availability and favorable temperature conditions (warmer spring and cooler summer) caused enhanced carbon uptake over North America near and during El Niño.

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

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Aeronautics and Space Administration (NASA); National Oceanic and Atmospheric Administration (NOAA)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1559226

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 6 Vol. 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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