High temperature sensitivity of Arctic isoprene emissions explained by sedges

Hui Wang (), Allison M. Welch, Sanjeevi Nagalingam, Christopher Leong, Claudia I. Czimczik, Jing Tang, Roger Seco, Riikka Rinnan (), Lejish Vettikkat, Siegfried Schobesberger, Thomas Holst, Shobhit Brijesh, Rebecca J. Sheesley, Kelley C. Barsanti and Alex B. Guenther ()
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Hui Wang: University of California
Allison M. Welch: University of California
Sanjeevi Nagalingam: University of California
Christopher Leong: University of California
Claudia I. Czimczik: University of California
Jing Tang: University of Copenhagen
Roger Seco: Institute of Environmental Assessment and Water Research (IDAEA-CSIC)
Riikka Rinnan: University of Copenhagen
Lejish Vettikkat: University of Eastern Finland
Siegfried Schobesberger: University of Eastern Finland
Thomas Holst: Lund University
Shobhit Brijesh: University of California
Rebecca J. Sheesley: Baylor University
Kelley C. Barsanti: University of California Riverside
Alex B. Guenther: University of California

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract It has been widely reported that isoprene emissions from the Arctic ecosystem have a strong temperature response. Here we identify sedges (Carex spp. and Eriophorum spp.) as key contributors to this high sensitivity using plant chamber experiments. We observe that sedges exhibit a markedly stronger temperature response compared to that of other isoprene emitters and predictions by the widely accepted isoprene emission model, the Model of Emissions of Gases and Aerosols from Nature (MEGAN). MEGAN is able to reproduce eddy-covariance flux observations at three high-latitude sites by integrating our findings. Furthermore, the omission of the strong temperature responses of Arctic isoprene emitters causes a 20% underestimation of isoprene emissions for the high-latitude regions of the Northern Hemisphere during 2000-2009 in the Community Land Model with the MEGAN scheme. We also find that the existing model had underestimated the long-term trend of isoprene emissions from 1960 to 2009 by 55% for the high-latitude regions.

Date: 2024
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DOI: 10.1038/s41467-024-49960-0

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