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Tundra landscape heterogeneity, not interannual variability, controls the decadal regional carbon balance in the Western Russian Arctic

Treat, Claire C. (author)
University of Eastern Finland
Marushchak, Maija E. (author)
University of Eastern Finland
Voigt, Carolina (author)
University of Eastern Finland
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Zhang, Yu (author)
Natural Resources Canada
Tan, Zeli (author)
Pacific Northwest National Laboratory,Purdue University
Zhuang, Qianlai (author)
Purdue University
Virtanen, Tarmo A. (author)
University of Helsinki
Räsänen, Aleksi (author)
University of Helsinki,Norwegian University of Science and Technology
Biasi, Christina (author)
University of Eastern Finland
Hugelius, Gustaf (author)
Stockholm University,Stockholms universitet,Institutionen för naturgeografi
Kaverin, Dmitry (author)
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Miller, Paul A. (author)
Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,MERGE: ModElling the Regional and Global Earth system,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
Stendel, Martin (author)
Danish Meteorological Institute
Romanovsky, Vladimir (author)
University of Alaska Fairbanks
Rivkin, Felix (author)
Lomonosov Moscow State University
Martikainen, Pertti J. (author)
University of Eastern Finland
Shurpali, Narasinha J. (author)
University of Eastern Finland
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 (creator_code:org_t)
2018-09-09
2018
English.
In: Global Change Biology. - : Wiley. - 1354-1013 .- 1365-2486. ; 24:11, s. 5188-5204
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Across the Arctic, the net ecosystem carbon (C) balance of tundra ecosystems is highly uncertain due to substantial temporal variability of C fluxes and to landscape heterogeneity. We modeled both carbon dioxide (CO2) and methane (CH4) fluxes for the dominant land cover types in a similar to 100-km(2) sub-Arctic tundra region in northeast European Russia for the period of 2006-2015 using process-based biogeochemical models. Modeled net annual CO2 fluxes ranged from --300 g C m(-2) year(-1) [net uptake] in a willow fen to 3 g Cm-2 year(-1) [net source] in dry lichen tundra. Modeled annual CH4 emissions ranged from -0.2 to 22.3 g Cm-2 year(-1) at a peat plateau site and a willow fen site, respectively. Interannual variability over the decade was relatively small (20%-25%) in comparison with variability among the land cover types (150%). Using high-resolution land cover classification, the region was a net sink of atmospheric CO2 across most land cover types but a net source of CH4 to the atmosphere due to high emissions from permafrost-free fens. Using a lower resolution for land cover classification resulted in a 20%-65% underestimation of regional CH4 flux relative to high-resolution classification and smaller (10%) overestimation of regional CO2 uptake due to the underestimation of wetland area by 60%. The relative fraction of uplands versus wetlands was key to determining the net regional C balance at this and other Arctic tundra sites because wetlands were hot spots for C cycling in Arctic tundra ecosystems.

Subject headings

NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)

Keyword

ecosystem modeling
methane
net ecosystem CO2 exchange
peatland
permafrost
regional carbon balance
Russia
Tundra
ecosystem modeling
methane
net ecosystem CO exchange
peatland
permafrost
regional carbon balance
Russia
Tundra

Publication and Content Type

ref (subject category)
art (subject category)

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