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Title: Reduced arctic tundra productivity linked with landform and climate change interactions

Journal Article · · Scientific Reports
 [1];  [2]; ORCiD logo [2];  [3];  [4]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Plant Biology; Univ. of Alaska, Fairbanks, AK (United States). Inst. of Arctic Biology
  2. Alfred Wegener Inst. for Polar and Marine Research, Potsdam (Germany); Univ. of Potsdam (Germany). Inst. of Earth and Environmental Science
  3. US Fish and Wildlife Service, Fairbanks, AK (United States)
  4. Univ. of Alaska, Fairbanks, AK (United States). US Fish and Wildlife Research Unit. Alaska Cooperative Fish and Wildlife Research Unit.

Arctic tundra ecosystems have experienced unprecedented change associated with climate warming over recent decades. Across the Pan-Arctic, vegetation productivity and surface greenness have trended positively over the period of satellite observation. However, since 2011 these trends have slowed considerably, showing signs of browning in many regions. It is unclear what factors are driving this change and which regions/landforms will be most sensitive to future browning. Here we provide evidence linking decadal patterns in arctic greening and browning with regional climate change and local permafrost-driven landscape heterogeneity. We analyzed the spatial variability of decadal-scale trends in surface greenness across the Arctic Coastal Plain of northern Alaska (~60,000km²) using the Landsat archive (1999–2014), in combination with novel 30m classifications of polygonal tundra and regional watersheds, finding landscape heterogeneity and regional climate change to be the most important factors controlling historical greenness trends. Browning was linked to increased temperature and precipitation, with the exception of young landforms (developed following lake drainage), which will likely continue to green. Spatiotemporal model forecasting suggests carbon uptake potential to be reduced in response to warmer and/or wetter climatic conditions, potentially increasing the net loss of carbon to the atmosphere, at a greater degree than previously expected.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). NGEE-Arctic
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1624379
Journal Information:
Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (17)

Nutrient Release From Permafrost Thaw Enhances CH 4 Emissions From Arctic Tundra Wetlands journal June 2019
Space‐Based Observations for Understanding Changes in the Arctic‐Boreal Zone journal January 2020
Complexity revealed in the greening of the Arctic journal January 2020
Tundra landform and vegetation productivity trend maps for the Arctic Coastal Plain of northern Alaska journal April 2018
Vulnerability and resilience of the carbon exchange of a subarctic peatland to an extreme winter event journal June 2018
Is arctic greening consistent with the ecology of tundra? Lessons from an ecologically informed mass balance model journal December 2018
Varying climate response across the tundra, forest-tundra and boreal forest biomes in northern West Siberia journal July 2019
Identifying multidisciplinary research gaps across Arctic terrestrial gradients journal December 2019
Arctic greening associated with lengthening growing seasons in Northern Alaska journal December 2019
Phylogenetic diversity and environment form assembly rules for Arctic diatom genera—A study on recent and ancient sedimentary DNA journal January 2020
Water as a resource, stress and disturbance shaping tundra vegetation journal January 2019
Regional Patterns and Asynchronous Onset of Ice-Wedge Degradation since the Mid-20th Century in Arctic Alaska journal August 2018
Model Simulation and Prediction of Decadal Mountain Permafrost Distribution Based on Remote Sensing Data in the Qilian Mountains from the 1990s to the 2040s journal January 2019
Patterns of Arctic Tundra Greenness Based on Spatially Downscaled Solar-Induced Fluorescence journal June 2019
Tundra landform and vegetation productivity trend maps for the Arctic Coastal Plain of northern Alaska text January 2020
Arctic greening associated with lengthening growing seasons in Northern Alaska text January 2019
Alder Distribution and Expansion Across a Tundra Hillslope: Implications for Local N Cycling journal October 2019