Surface energy exchange in pristine and managed boreal peatlands

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Alekseychik , P , Mammarella , I , Lindroth , A , Lohila , A , Aurela , M , Laurila , T , Kasurinen , V , Lund , M , Rinne , J , Nilsson , M B , Peichl , M , Minkkinen , K , Shurpali , N J , Tuittila , E-S , Martikainen , P J , Tuovinen , J-P & Vesala , T 2018 , ' Surface energy exchange in pristine and managed boreal peatlands ' , Mires and Peat , vol. 21 , 14 . https://doi.org/10.19189/MaP.2018.OMB.333

Title: Surface energy exchange in pristine and managed boreal peatlands
Author: Alekseychik, P.; Mammarella, I.; Lindroth, A.; Lohila, A.; Aurela, M.; Laurila, T.; Kasurinen, V.; Lund, M.; Rinne, J.; Nilsson, M. B.; Peichl, M.; Minkkinen, K.; Shurpali, N. J.; Tuittila, E.-S.; Martikainen, P. J.; Tuovinen, J.-P.; Vesala, T.
Contributor: University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018
Language: eng
Number of pages: 26
Belongs to series: Mires and Peat
ISSN: 1819-754X
URI: http://hdl.handle.net/10138/278432
Abstract: Surface-atmosphere energy exchange is strongly ecosystem-specific. At the same time, as the energy balance constitutes responses of an ecosystem to environmental stressors including precipitation, humidity and solar radiation, it results in feedbacks of potential importance for the regional climate. Northern peatlands represent a diverse class of ecosystems that cover nearly 6 x 10(6) km(2) in the Boreal region, which makes the inter-comparison of their energy balances an important objective. With this in mind we studied energy exchange across a broad spectrum of peatlands from pristine fens and bogs to forested and agriculturally managed peatlands, which represent a large fraction of the landscape in Finland and Sweden. The effects of management activities on the energy balance were extensively examined from the micrometeorological point of view, using eddy covariance data from eight sites in these two countries (56 degrees 12'-62 degrees 11' N, 13 degrees 03'-30 degrees 05' E). It appears that the surface energy balance varies widely amongst the different peatland types. Generally, energy exchange features including the Bowen ratio, surface conductance, coupling to the atmosphere, responses to water table fluctuations and vapour pressure deficit could be associated directly with the peatland type. The relative constancy of the Bowen ratio in natural open mires contrasted with its variation in tree-covered and agricultural peatlands. We conclude that the impacts of management and the consequences of land-use change in peatlands for the local and regional climate might be substantial.
Subject: Bowen ratio
land use
peatland management
surface energy balance
WATER-VAPOR EXCHANGE
CO2 EXCHANGE
BALANCE CLOSURE
HEAT-STORAGE
INTERANNUAL VARIABILITY
HYDROLOGICAL PROCESSES
NORTHERN PEATLANDS
CARBON-DIOXIDE
ORGANIC SOIL
SEDGE FEN
1172 Environmental sciences
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