globalchange  > 气候减缓与适应
DOI: 10.1029/2017JD027751
Scopus记录号: 2-s2.0-85047805544
论文题名:
Lake-Atmosphere Heat Flux Dynamics of a Thermokarst Lake in Arctic Siberia
作者: Franz D.; Mammarella I.; Boike J.; Kirillin G.; Vesala T.; Bornemann N.; Larmanou E.; Langer M.; Sachs T.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期:10
起始页码: 5222
结束页码: 5239
语种: 英语
英文关键词: Arctic Lake ; bulk transfer model ; eddy covariance ; energy balance ; evaporation ; heat flux
英文摘要: We conducted eddy covariance measurements from April to August 2014 on a Siberian thermokarst lake. The study site is located in the Lena River Delta and characterized as a floating ice lake. Heat fluxes differed in magnitudes, directions and temporal patterns depending on the lake surface conditions (“frozen” ice cover, ice cover melt, and open water). Significant heat release during frozen ice cover conditions highlighted the importance of lakes for the landscape heat budget and water balance. The energy balance was nearly closed during the open water period and highlighted the impact of melting energy on its closure during the ice cover period. Sensible and latent heat dynamics were driven by temperature and water vapor gradients scaled by wind speed, respectively. We calculated bulk aerodynamics transfer coefficients and evaluated the performance of the derived in situ and three independent heat flux parameterization schemes. We found that bulk transfer models perform moderately to poorly for the different lake surface conditions. During the open water period small-scale temporal variability could not be represented by the models, particularly in case of latent heat flux. The model results were less sensitive to the specific model type than to the accuracy of the surface water temperature measurement, which is dependent on a well-thought-out measurement design. Our study stresses considerations that are crucial for similar campaigns in the future, in order to face the measurement challenges encountered on arctic lakes especially during the ice cover period. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113840
Appears in Collections:气候减缓与适应

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作者单位: GFZ German Research Centre for Geosciences, Potsdam, Germany; Institute for Atmosphere and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland; Alfred Wegener Institute for Polar and Marine Research (AWI), Potsdam, Germany; Department of Geography, Humboldt-Universität zu Berlin, Berlin, Germany; Department of Ecohydrology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany; Institute for Atmosphere and Earth System Research/Forest Sciences, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland; Now at Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; Institute of Flight Guidance, TU Braunschweig, Braunschweig, Germany

Recommended Citation:
Franz D.,Mammarella I.,Boike J.,et al. Lake-Atmosphere Heat Flux Dynamics of a Thermokarst Lake in Arctic Siberia[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(10)
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