Shifted energy fluxes, increased Bowen ratios, and reduced thaw depths linked with drainage-induced changes in permafrost ecosystem structure

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Göckede , M , Kittler , F , Kwon , M J , Burjack , I , Heimann , M , Kolle , O , Zimov , N & Zimov , S 2017 , ' Shifted energy fluxes, increased Bowen ratios, and reduced thaw depths linked with drainage-induced changes in permafrost ecosystem structure ' , Cryosphere , vol. 11 , no. 6 . https://doi.org/10.5194/tc-11-2975-2017

Title: Shifted energy fluxes, increased Bowen ratios, and reduced thaw depths linked with drainage-induced changes in permafrost ecosystem structure
Author: Göckede, Mathias; Kittler, Fanny; Kwon, Min Jung; Burjack, Ina; Heimann, Martin; Kolle, Olaf; Zimov, Nikita; Zimov, Sergey
Contributor organization: Department of Physics
INAR Physics
Date: 2017-12-15
Language: eng
Number of pages: 22
Belongs to series: Cryosphere
ISSN: 1994-0416
DOI: https://doi.org/10.5194/tc-11-2975-2017
URI: http://hdl.handle.net/10138/230851
Abstract: Hydrologic conditions are a key factor in Arctic ecosystems, with strong influences on ecosystem structure and related effects on biogeophysical and biogeochemical processes. With systematic changes in water availability expected for large parts of the northern high-latitude region in the coming centuries, knowledge on shifts in ecosystem functionality triggered by altered water levels is crucial for reducing uncertainties in climate change predictions. Here, we present findings from paired ecosystem observations in northeast Siberia comprising a drained and a control site. At the drainage site, the water table has been artificially lowered by up to 30 cm in summer for more than a decade. This sustained primary disturbance in hydrologic conditions has triggered a suite of secondary shifts in ecosystem properties, including vegetation community structure, snow cover dynamics, and radiation budget, all of which influence the net effects of drainage. Reduced thermal conductivity in dry organic soils was identified as the dominating drainage effect on energy budget and soil thermal regime. Through this effect, reduced heat transfer into deeper soil layers leads to shallower thaw depths, initially leading to a stabilization of organic permafrost soils, while the long-term effects on permafrost temperature trends still need to be assessed. At the same time, more energy is transferred back into the atmosphere as sensible heat in the drained area, which may trigger a warming of the lower atmospheric surface layer.
Subject: SNOW-SHRUB INTERACTIONS
HIGH-LATITUDE WETLANDS
POLYGONAL TUNDRA SITE
CLIMATE-CHANGE
ARCTIC TUNDRA
SOIL TEMPERATURES
CARBON DYNAMICS
NORTHERN SIBERIA
TUSSOCK TUNDRA
WATER-BALANCE
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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