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Geographic and temporal variations in turbulent heat loss from lakes: A global analysis across 45 lakes
Univ Reading, Dept Meteorol, Reading, Berks, England.
Natl Inst Water & Atmospher Res, Hamilton, New Zealand.
Univ Wisconsin, Ctr Limnol, Madison, WI 53706 USA.
Univ Reading, Dept Meteorol, Reading, Berks, England;Univ Reading, Natl Ctr Earth Observat, Reading, Berks, England.
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2018 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 63, no 6, p. 2436-2449Article in journal (Refereed) Published
Abstract [en]

Heat fluxes at the lake surface play an integral part in determining the energy budget and thermal structure in lakes, including regulating how lakes respond to climate change. We explore patterns in turbulent heat fluxes, which vary across temporal and spatial scales, using in situ high-frequency monitoring data from 45 globally distributed lakes. Our analysis demonstrates that some of the lakes studied follow a marked seasonal cycle in their turbulent surface fluxes and that turbulent heat loss is highest in larger lakes and those situated at low latitude. The Bowen ratio, which is the ratio of mean sensible to mean latent heat fluxes, is smaller at low latitudes and, in turn, the relative contribution of evaporative to total turbulent heat loss increases toward the tropics. Latent heat transfer ranged from similar to 60% to > 90% of total turbulent heat loss in the examined lakes. The Bowen ratio ranged from 0.04 to 0.69 and correlated significantly with latitude. The relative contributions to total turbulent heat loss therefore differ among lakes, and these contributions are influenced greatly by lake location. Our findings have implications for understanding the role of lakes in the climate system, effects on the lake water balance, and temperature-dependent processes in lakes.

Place, publisher, year, edition, pages
WILEY , 2018. Vol. 63, no 6, p. 2436-2449
National Category
Climate Research
Identifiers
URN: urn:nbn:se:uu:diva-371086DOI: 10.1002/lno.10950ISI: 000450233300010OAI: oai:DiVA.org:uu-371086DiVA, id: diva2:1272767
Funder
EU, Horizon 2020, 640171Available from: 2018-12-19 Created: 2018-12-19 Last updated: 2019-01-07Bibliographically approved

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Pierson, Don

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