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The extent and variability of storm‐induced temperature changes in lakes measured with long‐term and high‐frequency data

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2021

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Doubek, Jonathan P.
Anneville, Orlane
Dur, Gaël
Lewandowska, Aleksandra M.
Patil, Vijay P.
Rusak, James A.
Salmaso, Nico
Seltmann, Christian Torsten
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Limnology and Oceanography. Wiley-Blackwell. 2021, 66(5), pp. 1979-1992. ISSN 0024-3590. eISSN 1939-5590. Available under: doi: 10.1002/lno.11739

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The intensity and frequency of storms are projected to increase in many regions of the world because of cli-mate change. Storms can alter environmental conditions in many ecosystems. In lakes and reservoirs, stormscan reduce epilimnetic temperatures from wind-induced mixing with colder hypolimnetic waters, direct precipi-tation to the lake’s surface, and watershed runoff. We analyzed 18 long-term and high-frequency lake datasetsfrom 11 countries to assess the magnitude of wind- vs. rainstorm-induced changes in epilimnetic temperature.We found small day-to-day epilimnetic temperature decreases in response to strong wind and heavy rain duringstratified conditions. Day-to-day epilimnetic temperature decreased, on average, by 0.28C during the strongestwindstorms (storm mean daily wind speed among lakes: 6.7 2.7 m s−1, 1 SD) and by 0.15 C after the heaviestrainstorms (storm mean daily rainfall: 21.3 9.0 mm). The largest decreases in epilimnetic temperature wereobserved≥2 d after sustained strong wind or heavy rain (top 5thpercentile of wind and rain events for each lake)in shallow and medium-depth lakes. The smallest decreases occurred in deep lakes. Epilimnetic temperaturechange from windstorms, but not rainstorms, was negatively correlated with maximum lake depth. However,even the largest storm-induced mean epilimnetic temperature decreases were typically <2 C. Day-to-day temper-ature change, in the absence of storms, often exceeded storm-induced temperature changes. Because storm-induced temperature changes to lake surface waters were minimal, changes in other limnological variables(e.g., nutrient concentrations or light) from storms may have larger impacts on biological communities thantemperature changes.

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570 Biowissenschaften, Biologie

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ISO 690DOUBEK, Jonathan P., Orlane ANNEVILLE, Gaël DUR, Aleksandra M. LEWANDOWSKA, Vijay P. PATIL, James A. RUSAK, Nico SALMASO, Christian Torsten SELTMANN, Dietmar STRAILE, 2021. The extent and variability of storm‐induced temperature changes in lakes measured with long‐term and high‐frequency data. In: Limnology and Oceanography. Wiley-Blackwell. 2021, 66(5), pp. 1979-1992. ISSN 0024-3590. eISSN 1939-5590. Available under: doi: 10.1002/lno.11739
BibTex
@article{Doubek2021-05exten-53389,
  year={2021},
  doi={10.1002/lno.11739},
  title={The extent and variability of storm‐induced temperature changes in lakes measured with long‐term and high‐frequency data},
  number={5},
  volume={66},
  issn={0024-3590},
  journal={Limnology and Oceanography},
  pages={1979--1992},
  author={Doubek, Jonathan P. and Anneville, Orlane and Dur, Gaël and Lewandowska, Aleksandra M. and Patil, Vijay P. and Rusak, James A. and Salmaso, Nico and Seltmann, Christian Torsten and Straile, Dietmar}
}
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