Affiliation:
1. School of Geography and Ocean Science Nanjing University Nanjing China
2. Department of Ecohydrology and Biogeochemistry Leibniz‐Institute of Freshwater Ecology and Inland Fisheries Berlin Germany
3. School of Public Administration Nanjing University of Finance & Economics Nanjing China
4. Key Laboratory of Tibetan Environment Changes and Land Surface Processes (TEL) Institute of Tibetan Plateau Research (ITP) Chinese Academy of Sciences Beijing China
5. Department of Geography and Atmospheric Science University of Kansas Lawrence KS USA
Abstract
AbstractEffects of lake evaporation (EW) on basin evapotranspiration (ETB) and lake water storage change (LWSC) at lake‐basin scale have never been reported for most basins on the inner Tibetan Plateau (IB). In this study, EW of 118 large lakes in 95 closed lake‐basins were estimated, and its effects on ETB and LWSC over 2001–2018 were examined using a derivative‐guided framework from the aspects of EW amount, rate, trend slope and inter‐annual variability. We found that EW amount has a high effect (17%) on regional ETB amount compared to the average lake area ratio (α) (∼5%), and the effect has increased significantly (2%/10 a). The spatial pattern of the effect is mainly controlled by α, and the increasing trend of α (0.6%/10 a) also dominated the increasing trend in regional ETB rate (0.30 mm/a) though with large spatial heterogeneity. Variance in α and EW rate have a minor effect (∼3%) on ETB variance, especially for the basins with lower α. The combination of quasi lake inflow (RL, 41%) and lake surface precipitation (PW, 16%) offset the depletion of EW (−43%), resulting in the surplus of regional lake water (LWSC > 0). The increase in EW mount, which is mainly from lake area expansion (90%), caused a decreasing trend in LWSC (i.e., slower growth rate) with a contribution of −59%. This suggests a negative feedback between lake area expansion and EW amount in the IB, and the feedback may continue with the predicted area increases.
Funder
China Scholarship Council
Publisher
American Geophysical Union (AGU)
Subject
Water Science and Technology
Cited by
1 articles.
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