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Interannual fires as a source for subarctic summer decadal climate variability mediated by permafrost thawing

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Title
Interannual fires as a source for subarctic summer decadal climate variability mediated by permafrost thawing
Author(s)
Ji-Eun Kim; Yamaguchi, Ryohei; Keith B. Rodgers; Axel Timmermann; Sun-Seon Lee; Karl Stein; Danabasoglu, Gokhan; Lamarque, Jean-Francois; Fasullo, John T.; Deser, Clara; Rosenbloom, Nan; Edwards, Jim; Stuecker, Malte F.
Publication Date
2023-07
Journal
npj Climate and Atmospheric Science, v.6, no.1
Publisher
Nature Research
Abstract
Climate model simulations run under the Coupled Model Intercomparison Project Phase 6 (CMIP6) use an inhomogeneous biomass burning aerosol (BBA) emission dataset, which exhibits pronounced interannual variability from 1997–2014 due to the infusion of satellite data. Using the Community Earth System Model version 2 Large Ensemble (CESM2-LE) with original and smoothed CMIP6 BBA forcings, we show that the CMIP6 data inhomogeneity causes spurious decadal subarctic land warming. During years with reduced aerosol concentrations, increased solar radiation can trigger abrupt subarctic permafrost thawing, increased soil water drainage, upper soil drying, and subsequent surface warming. This slow process, which is further amplified by nonlinear cloud-aerosol interactions, cannot be completely offset during years of increased aerosol fluxes, thereby reddening surface temperature spectra in response to large-amplitude interannual aerosol forcing. More generally, our CESM2 experiments identify a pathway for generating decadal variability in high latitudes, involving interannual shortwave forcing and slow nonlinear soil responses. © 2023, The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/13778
DOI
10.1038/s41612-023-00415-1
ISSN
2397-3722
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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