Permafrost response to vegetation greenness variation in the Arctic tundra through positive feedback in surface air temperature and snow cover

Zhan Wang, Yeonjoo Kim, Hochoel Seo, Myoung Jin Um, Jiafu Mao

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The permafrost response to variations in Arctic vegetation remains controversial. We investigated the consequences of Arctic vegetation greenness variation over the past three decades using a coupled land-atmosphere model and found that it induces air temperature perturbation, which is further amplified by snow cover variation and eventually leaves a footprint on soil temperature. Compared to the atmospheric impacts of vegetation, local shading of vegetation canopy has relatively minor effects on soil temperature. Significant soil warming was observed along the summer snowline between the Low and High Arctic, indicating the direct impact of snow cover variation led by vegetation changes. In the Low Arctic, the winter snowpack insulates the soil from colder air, resulting in less permafrost. In the High Arctic, snow persists for more than 330 d per year and has a strong protection effect on the permafrost as it insulates soil from warmer summer air and reflects solar radiation.

Original languageEnglish
Article number044024
JournalEnvironmental Research Letters
Volume14
Issue number4
DOIs
Publication statusPublished - 2019 Apr 12

Bibliographical note

Funding Information:
Original content from this work may be used under the terms of the . Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Korea Polar Research Institute https://doi.org/10.13039/501100004230 PE18900 PN19081 Yonsei University Research Fund Postdoctoral Research Supporting Program of 2017 / U.S. Department of Energy Office of Science RUBISCO SFA UT-BATTELLE (DE-AC05-00OR22725) yes � 2019 The Author(s). Published by IOP Publishing Ltd Creative Commons Attribution 3.0 licence

Publisher Copyright:
© 2019 The Author(s). Published by IOP Publishing Ltd.

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Public Health, Environmental and Occupational Health

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