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Global lake evaporation accelerated by changes in surface energy allocation in a warmer climate

Abstract

Lake evaporation is a sensitive indicator of the hydrological response to climate change. Variability in annual lake evaporation has been assumed to be controlled primarily by the incoming surface solar radiation. Here we report simulations with a numerical model of lake surface fluxes, with input data based on a high-emissions climate change scenario (Representative Concentration Pathway 8.5). In our simulations, the global annual lake evaporation increases by 16% by the end of the century, despite little change in incoming solar radiation at the surface. We attribute about half of this projected increase to two effects: periods of ice cover are shorter in a warmer climate and the ratio of sensible to latent heat flux decreases, thus channelling more energy into evaporation. At low latitudes, annual lake evaporation is further enhanced because the lake surface warms more slowly than the air, leading to more long-wave radiation energy available for evaporation. We suggest that an analogous change in the ratio of sensible to latent heat fluxes in the open ocean can help to explain some of the spread among climate models in terms of their sensitivity of precipitation to warming. We conclude that an accurate prediction of the energy balance at the Earth’s surface is crucial for evaluating the hydrological response to climate change.

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Fig. 1: Conceptual diagram of lake evaporation changes in a warmer climate.
Fig. 2: Changes in annual lake evaporation.
Fig. 3: Attribution of lake latent heat flux change.
Fig. 4: Temperature controls on lake Bowen ratio.
Fig. 5: Global precipitation temperature sensitivity in CMIP5 models.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (grant nos 41505005, 41475141, 41575147 and 41275024), the Natural Science Foundation of Jiangsu Province, China (grant no. BK20150900), the Ministry of Education of China (grant PCSIRT) and the Priority Academic Program Development of Jiangsu Higher EducationInstitutions (grant PAPD). We thank Z. Zubin for running the historical lake simulation. The futuristic simulation was supported by high-performance computing from Yellowstone (ark:/85065/d7wd3xhc) provided by NCAR’s Computational and Information Systems Laboratory, sponsored by the US National Science Foundation.

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X.L. designed the research, L.Z. performed the model simulation and W.W. carried out the analysis. S.L., N.S., W.X., Y.W. and M.Z. contributed ideas to the data analysis and manuscript writing, and X.L. and W.W. wrote the manuscript.

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Correspondence to Xuhui Lee.

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Wang, W., Lee, X., Xiao, W. et al. Global lake evaporation accelerated by changes in surface energy allocation in a warmer climate. Nature Geosci 11, 410–414 (2018). https://doi.org/10.1038/s41561-018-0114-8

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