Greening in the circumpolar high-latitude may amplify warming in the growing season

Research output: Contribution to journalArticle

Abstract

We present a study that suggests greening in the circumpolar high-latitude regions amplifies surface warming in the growing season (May-September) under enhanced greenhouse conditions. The investigation used a series of climate simulations with the Community Atmospheric Model version 3-which incorporates a coupled, dynamic global vegetation model-with and without vegetation feedback, under both present and doubled CO2 concentrations. Results indicate that climate warming and associated changes promote circumpolar greening with northward expansion and enhanced greenness of both the Arctic tundra and boreal forest regions. This leads to additional surface warming in the high-latitudes in the growing season, primarily through more absorption of incoming solar radiation. The resulting surface and tropospheric warming in the high-latitude and Arctic regions weakens prevailing tropospheric westerlies over 45-70N, leading to the formation of anticyclonic pressure anomalies in the Arctic regions. These pressure anomalies resemble the anomalous circulation pattern during the negative phase of winter Arctic Oscillation. It is suggested that these circulation anomalies reinforce the high-latitude and Arctic warming in the growing season.

Details

Authors
  • Jee-Hoon Jeong
  • J.-S. Kug
  • B.-M. Kim
  • S.-K. Min
  • Hans Linderholm
  • C.-H. Ho
  • D.P. Rayner
  • Deliang Chen
  • S.-Y. Jun
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Earth and Related Environmental Sciences

Keywords

  • Vegetation, Arctic warming, Arctic greening, Climate model, Future climate, Atmospheric circulation, Surface energy budget
Original languageEnglish
Pages (from-to)1421-1431
JournalClimate Dynamics
Volume38
Issue number7-8
Publication statusPublished - 2012
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes