globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12640
论文题名:
Latent heat exchange in the boreal and arctic biomes
作者: Kasurinen V.; Alfredsen K.; Kolari P.; Mammarella I.; Alekseychik P.; Rinne J.; Vesala T.; Bernier P.; Boike J.; Langer M.; Belelli Marchesini L.; van Huissteden K.; Dolman H.; Sachs T.; Ohta T.; Varlagin A.; Rocha A.; Arain A.; Oechel W.; Lund M.; Grelle A.; Lindroth A.; Black A.; Aurela M.; Laurila T.; Lohila A.; Berninger F.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期:11
起始页码: 3439
结束页码: 3456
语种: 英语
英文关键词: Eddy-covariance ; Evapotranspiration ; Latent heat ; Phenology ; Stomatal resistance
Scopus关键词: Arctic ; Asia ; ecosystem ; Europe ; forest ; grassland ; heat ; North America ; theoretical model ; tundra ; wetland ; Arctic Regions ; Asia ; Ecosystem ; Europe ; Forests ; Grassland ; Hot Temperature ; Models, Theoretical ; North America ; Tundra ; Wetlands
英文摘要: In this study latent heat flux (λE) measurements made at 65 boreal and arctic eddy-covariance (EC) sites were analyses by using the Penman-Monteith equation. Sites were stratified into nine different ecosystem types: harvested and burnt forest areas, pine forests, spruce or fir forests, Douglas-fir forests, broadleaf deciduous forests, larch forests, wetlands, tundra and natural grasslands. The Penman-Monteith equation was calibrated with variable surface resistances against half-hourly eddy-covariance data and clear differences between ecosystem types were observed. Based on the modeled behavior of surface and aerodynamic resistances, surface resistance tightly control λE in most mature forests, while it had less importance in ecosystems having shorter vegetation like young or recently harvested forests, grasslands, wetlands and tundra. The parameters of the Penman-Monteith equation were clearly different for winter and summer conditions, indicating that phenological effects on surface resistance are important. We also compared the simulated λE of different ecosystem types under meteorological conditions at one site. Values of λE varied between 15% and 38% of the net radiation in the simulations with mean ecosystem parameters. In general, the simulations suggest that λE is higher from forested ecosystems than from grasslands, wetlands or tundra-type ecosystems. Forests showed usually a tighter stomatal control of λE as indicated by a pronounced sensitivity of surface resistance to atmospheric vapor pressure deficit. Nevertheless, the surface resistance of forests was lower than for open vegetation types including wetlands. Tundra and wetlands had higher surface resistances, which were less sensitive to vapor pressure deficits. The results indicate that the variation in surface resistance within and between different vegetation types might play a significant role in energy exchange between terrestrial ecosystems and atmosphere. These results suggest the need to take into account vegetation type and phenology in energy exchange modeling. © 2014 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62202
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Forest Sciences, University of Helsinki, POBox 27, Helsinki, Finland; Department of Hydraulic and Environmental Engineering, Norwegian University of Science and Technology, Trondheim, Norway; Department of Physics, University of Helsinki, POBox 48, Helsinki, Finland; Natural Resources Canada, Canadian Forest Service, Stn. Ste-Foy, P.O. Box 10380, Quebec, QC, Canada; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg, Potsdam, Germany; Earth and Climate Cluster, Department of Earth Sciences, VU University Amsterdam, De Boelelaan 1085, Amsterdam, Netherlands; GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany; Graduate School of Bioagricultural Sciences, Nogoya University, Furo-cho, Chikusa Ward, Nagoya, Aichi, Japan; A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky pr.33, Moscow, Russian Federation; Department of Biological Sciences and the Environmental Change Initiative, University of Notre Dame, Notre Dame, IN, United States; McMaster Centre for Climate Change and School of Geography and Earth Sciences, McMaster University, Hamilton, ON, Canada; Global Change Research Group, San Diego State University, 5500 Campanile Drive, San Diego, CA, United States; Arctic Research Centre, Department of Bioscience, Aarhus University, Frederiksborgvej 399, Roskilde, Denmark; Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden; Department of Earth and Ecosystem Sciences, Lund University, Lund, Sweden; Faculty of Land and Food Systems, University of British Columbia, Vancouver, Canada; Finnish Meteorological Institute, Atmospheric Composition Research, PO Box 503, Helsinki, Finland

Recommended Citation:
Kasurinen V.,Alfredsen K.,Kolari P.,et al. Latent heat exchange in the boreal and arctic biomes[J]. Global Change Biology,2014-01-01,20(11)
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