Disproportionate impact of atmospheric heat events on lake surface water temperature increases

Xiwen Wang, Kun Shi (), Boqiang Qin, Yunlin Zhang and R. Iestyn Woolway
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Xiwen Wang: Chinese Academy of Sciences
Kun Shi: Chinese Academy of Sciences
Boqiang Qin: Chinese Academy of Sciences
Yunlin Zhang: Chinese Academy of Sciences
R. Iestyn Woolway: Bangor University

Nature Climate Change, 2024, vol. 14, issue 11, 1172-1177

Abstract: Abstract Hot temperature extremes (HTEs) in the atmosphere can also affect lake surface water temperature, but how this impact changes with global warming is not well understood. Here we use numerical modelling and satellite observations to quantify the contribution of HTEs to variations in summer lake surface water temperature and lake heatwaves in 1,260 water bodies worldwide between 1979 and 2022. Over this time period, HTE duration and cumulative intensity over the studied lakes increased significantly, at average rates of 1.4 days per decade and 0.92 °C days per decade, respectively. Despite only accounting for 7% of the total summer days, HTEs are responsible for 24% of lake surface summer warming trends, with the most pronounced effect observed in Europe at 27%. Moreover, HTEs are key drivers of both the duration and cumulative intensity of lake heatwaves. Our findings underscore the pivotal role played by short-term climatic extreme events in shaping long-term lake surface water temperature dynamics.

Date: 2024
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DOI: 10.1038/s41558-024-02122-y

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