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Divergence of Arctic shrub growth associated with sea ice decline

Buchwal, Agata and Sullivan, Patrick F. and Macias-Fauria, Marc and Post, Eric and Myers-Smith, Isla H. and Stroeve, Julienne C. and Blok, Daan and Tape, Ken D. and Forbes, Bruce C. and Ropars, Pascale and Levesque, Esther and Elberling, Bo and Angers-Blondin, Sandra and Boyle, Joseph S. and Boudreau, Stephane and Boulanger-Lapointe, Noemie and Gamm, Cassandra and Hallinger, Martin and Rachlewicz, Grzegorz and Young, Amanda and Zetterberg, Pentti and Welker, Jeffrey M. (2020). Divergence of Arctic shrub growth associated with sea ice decline. Proceedings of the National Academy of Sciences of the United States of America. 117 , 33334-33344
[Research article]

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Abstract

Arctic sea ice extent (SIE) is declining at an accelerating rate with a wide range of ecological consequences. However, determining sea ice effects on tundra vegetation remains a challenge. In this study, we examined the universality or lack thereof in tundra shrub growth responses to changes in SIE and summer climate across the Pan-Arctic, taking advantage of 23 tundra shrub-ring chronologies from 19 widely distributed sites (56 degrees N to 83 degrees N). We show a clear divergence in shrub growth responses to SIE that began in the mid-1990s, with 39% of the chronologies showing declines and 57% showing increases in radial growth (decreasers and increasers, respectively). Structural equation models revealed that declining SIE was associated with rising air temperature and precipitation for increasers and with increasingly dry conditions for decreasers. Decreasers tended to be from areas of the Arctic with lower summer precipitation and their growth decline was related to decreases in the standardized precipitation evapotranspiration index. Our findings suggest that moisture limitation, associated with declining SIE, might inhibit the positive effects of warming on shrub growth over a considerable part of the terrestrial Arctic, thereby complicating predictions of vegetation change and future tundra productivity.

Authors/Creators:Buchwal, Agata and Sullivan, Patrick F. and Macias-Fauria, Marc and Post, Eric and Myers-Smith, Isla H. and Stroeve, Julienne C. and Blok, Daan and Tape, Ken D. and Forbes, Bruce C. and Ropars, Pascale and Levesque, Esther and Elberling, Bo and Angers-Blondin, Sandra and Boyle, Joseph S. and Boudreau, Stephane and Boulanger-Lapointe, Noemie and Gamm, Cassandra and Hallinger, Martin and Rachlewicz, Grzegorz and Young, Amanda and Zetterberg, Pentti and Welker, Jeffrey M.
Title:Divergence of Arctic shrub growth associated with sea ice decline
Series Name/Journal:Proceedings of the National Academy of Sciences of the United States of America
Year of publishing :2020
Volume:117
Page range:33334-33344
Number of Pages:11
Publisher:NATL ACAD SCIENCES
ISSN:0027-8424
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Climate Research
Keywords:tundra shrubs, sea ice, Arctic, shrub rings, divergence
URN:NBN:urn:nbn:se:slu:epsilon-p-110272
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-110272
Additional ID:
Type of IDID
DOI10.1073/pnas.2013311117
Web of Science (WoS)000604551600067
ID Code:21795
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:29 Jan 2021 14:23
Metadata Last Modified:29 Jan 2021 14:31

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