期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 17, 页码 8875-8883出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL073941
关键词
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资金
- EUSTACE from the EU Horizon Programme for Research and Innovation [640171]
- Ontario Ministry of the Environment and Climate Change
- Inter-American Institute for Global Change Research [CRN3038]
- National Science Foundation (NSF) Arctic Observing Network (AON) [1107792]
- Estonian Ministry of Education and Research [IUT21-2]
- Directorate For Geosciences
- ICER [1459322] Funding Source: National Science Foundation
- Directorate For Geosciences
- ICER [1128040] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1107792] Funding Source: National Science Foundation
- Natural Environment Research Council [ceh020010] Funding Source: researchfish
- NERC [ceh020010] Funding Source: UKRI
Turbulent fluxes across the air-water interface are integral to determining lake heat budgets, evaporation, and carbon emissions from lakes. The stability of the atmospheric boundary layer (ABL) influences the exchange of turbulent energy. We explore the differences in over-lake ABL stability using data from 39 globally distributed lakes. The frequency of unstable ABL conditions varied between lakes from 71 to 100% of the time, with average air temperatures typically several degrees below the average lake surface temperature. This difference increased with decreasing latitude, resulting in a more frequently unstable ABL and a more efficient energy transfer to and from the atmosphere, toward the tropics. In addition, during summer the frequency of unstable ABL conditions decreased with increasing lake surface area. The dependency of ABL stability on latitude and lake size has implications for heat loss and carbon fluxes from lakes, the hydrologic cycle, and climate change effects.
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