期刊
ENVIRONMENTAL RESEARCH LETTERS
卷 15, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1748-9326/abab34
关键词
peatlands; boreal forest; climate mitigation; regional climate; energy balance
资金
- ICOS-FINLAND [281255]
- Finnish Center of Excellence [307331]
- EU Horizon-2020 RINGO project [730944]
- Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-45-243003]
- RFBR [18-45-243003, 19-04-01234-a]
- Max Planck Society
- US National Science foundation [DEB-1440297]
- DOE Ameriflux Network Management Project
- Fluxnet Canada ResearchNetwork (2002-2007
- NSERC)
- Fluxnet Canada ResearchNetwork (2002-2007
- CFCAS)
- Fluxnet Canada ResearchNetwork (2002-2007
- BIOCAP)
- Canadian Carbon Program (2008-2012
- CFCAS)
- NSERC (Climate Change and Atmospheric Research)
- NSERC Discovery Grant
- Arctic Challenge for Sustainability II (ArCS II) project [JPMXD1420318865]
- NASA
- BIOCAP Canada
- Canadian Foundation for Climate and Atmospheric Sciences
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- FLUXNET-Canada Network (NSERC)
- FLUXNET-Canada Network (Canadian Foundation for Climate and Atmospheric Sciences (CFCAS))
- FLUXNET-Canada Network (BIOCAP Canada)
- Parks Canada
- Program of Energy Research and Development (PERD)
- Canada Research Chairs
- Natural Sciences and Engineering Research Council
- Canadian Carbon Program (CFCAS)
- Canada Foundation for Innovation Leaders Opportunity Fund
- Kempe Foundations [SMK-1743]
- VR [2018-03966]
- Formas [2016-01289]
- Knut and Alice Wallenberg Foundation [2015.0047]
- German Research Foundation [Wi 2680/2-1]
- European Union [36993]
- Cluster of Excellence 'CliSAP' of the University of Hamburg - German Research Foundation [EXC177]
- FLUXNET-Canada Network
- Canadian Carbon Program
- Ontario Ministry of the Environment, Conservation and Parks
- Yugra State University [13-01-20/39]
- NSERC [RDCPJ514218]
- Ministry of Transport and Communication through ICOS-Finland
- Academy of Finland [296888, 308511]
- Maj and Tor Nessling Foundation
- Yakutian Scientific Center of Siberian Branch of Russian Academy of Sciences [FWRS-2020-0012]
- RFBR
- Government of the KhantyMansi Autonomous Okrug -Yugra project [18-44-860017]
- Swedish research infrastructure SITES Sweden
- Swedish research infrastructure ICOS Sweden
- Global Water Futures research program
- NSERC
- Canadian Foundation for Innovation
- Canadian Forest Service
Peatlands and forests cover large areas of the boreal biome and are critical for global climate regulation. They also regulate regional climate through heat and water vapour exchange with the atmosphere. Understanding how land-atmosphere interactions in peatlands differ from forests may therefore be crucial for modelling boreal climate system dynamics and for assessing climate benefits of peatland conservation and restoration. To assess the biophysical impacts of peatlands and forests on peak growing season air temperature and humidity, we analysed surface energy fluxes and albedo from 35 peatlands and 37 evergreen needleleaf forests-the dominant boreal forest type-and simulated air temperature and vapour pressure deficit (VPD) over hypothetical homogeneous peatland and forest landscapes. We ran an evapotranspiration model using land surface parameters derived from energy flux observations and coupled an analytical solution for the surface energy balance to an atmospheric boundary layer (ABL) model. We found that peatlands, compared to forests, are characterized by higher growing season albedo, lower aerodynamic conductance, and higher surface conductance for an equivalent VPD. This combination of peatland surface properties results in a similar to 20% decrease in afternoon ABL height, a cooling (from 1.7 to 2.5 degrees C) in afternoon air temperatures, and a decrease in afternoon VPD (from 0.4 to 0.7 kPa) for peatland landscapes compared to forest landscapes. These biophysical climate impacts of peatlands are most pronounced at lower latitudes (similar to 45 degrees N) and decrease toward the northern limit of the boreal biome (similar to 70 degrees N). Thus, boreal peatlands have the potential to mitigate the effect of regional climate warming during the growing season. The biophysical climate mitigation potential of peatlands needs to be accounted for when projecting the future climate of the boreal biome, when assessing the climate benefits of conserving pristine boreal peatlands, and when restoring peatlands that have experienced peatland drainage and mining.
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