Twenty years of spatially coherent deepwater warming in lakes across Europe related to the North Atlantic Oscillation

Twenty to fifty years of annual mean deepwater (hypolimnetic) temperature data from twelve deep lakes spaced across Europe (2°95'W to 14°0'E, 46°27' to 59°00'N) show a high degree of coherence among lakes, particularly within geographic regions. Hypolimnetic temperatures vary bet...

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Published in:Limnology and Oceanography
Main Authors: Dokulil, Martin T., Jagsch, Albert, George, Glen D., Anneville, Orlane, Jankowski, Thomas, Wahl, Bernd, Lenhart, Brigitte, Blenckner, Thorsten, Teubner, Katrin
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2006
Subjects:
Online Access:https://doi.org/10.4319/lo.2006.51.6.2787
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spelling fteawag:oai:dora:eawag_5354 2024-09-15T18:22:30+00:00 Twenty years of spatially coherent deepwater warming in lakes across Europe related to the North Atlantic Oscillation Dokulil, Martin T. Jagsch, Albert George, Glen D. Anneville, Orlane Jankowski, Thomas Wahl, Bernd Lenhart, Brigitte Blenckner, Thorsten Teubner, Katrin 2006 https://doi.org/10.4319/lo.2006.51.6.2787 eng eng Wiley Limnology and Oceanography--Limnol. Oceanogr.--journals:1929--0024-3590 eawag:5354 journal id: journals:1929 issn: 0024-3590 ut: 000242265700024 local: 10836 scopus: 2-s2.0-33845449918 doi:10.4319/lo.2006.51.6.2787 Text Journal Article 2006 fteawag https://doi.org/10.4319/lo.2006.51.6.2787 2024-08-05T03:04:29Z Twenty to fifty years of annual mean deepwater (hypolimnetic) temperature data from twelve deep lakes spaced across Europe (2°95'W to 14°0'E, 46°27' to 59°00'N) show a high degree of coherence among lakes, particularly within geographic regions. Hypolimnetic temperatures vary between years but increased consistently in all lakes by about 0.1-0.2°C per decade. The observed increase was related to the weather generated by large-scale climatic processes over the Atlantic. To be effective, the climatic signal from the North Atlantic Oscillation (NAO) must affect deep lakes in spring before the onset of thermal stratification. The most consistent predictor of hypolimnetic temperature is the mean NAO index for January-May (NAO J-M ), which explains 22-63% of the interannual variation in deepwater temperature in 10 of the 12 lakes. The two exceptions are remote, less wind-exposed alpine valley lakes. In four of the deepest lakes, the climate signal fades with depth. The projected hypolimnetic temperature increase of approximately 1°C in 100 yr, obtained using a conservative approach, seems small. Effects on mixing conditions, thermal stability, or the replenishment of oxygen to deep waters result in accumulation of nutrients, which in turn will affect the trophic status and the food web. Article in Journal/Newspaper North Atlantic North Atlantic oscillation DORA Eawag Limnology and Oceanography 51 6 2787 2793
institution Open Polar
collection DORA Eawag
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language English
description Twenty to fifty years of annual mean deepwater (hypolimnetic) temperature data from twelve deep lakes spaced across Europe (2°95'W to 14°0'E, 46°27' to 59°00'N) show a high degree of coherence among lakes, particularly within geographic regions. Hypolimnetic temperatures vary between years but increased consistently in all lakes by about 0.1-0.2°C per decade. The observed increase was related to the weather generated by large-scale climatic processes over the Atlantic. To be effective, the climatic signal from the North Atlantic Oscillation (NAO) must affect deep lakes in spring before the onset of thermal stratification. The most consistent predictor of hypolimnetic temperature is the mean NAO index for January-May (NAO J-M ), which explains 22-63% of the interannual variation in deepwater temperature in 10 of the 12 lakes. The two exceptions are remote, less wind-exposed alpine valley lakes. In four of the deepest lakes, the climate signal fades with depth. The projected hypolimnetic temperature increase of approximately 1°C in 100 yr, obtained using a conservative approach, seems small. Effects on mixing conditions, thermal stability, or the replenishment of oxygen to deep waters result in accumulation of nutrients, which in turn will affect the trophic status and the food web.
format Article in Journal/Newspaper
author Dokulil, Martin T.
Jagsch, Albert
George, Glen D.
Anneville, Orlane
Jankowski, Thomas
Wahl, Bernd
Lenhart, Brigitte
Blenckner, Thorsten
Teubner, Katrin
spellingShingle Dokulil, Martin T.
Jagsch, Albert
George, Glen D.
Anneville, Orlane
Jankowski, Thomas
Wahl, Bernd
Lenhart, Brigitte
Blenckner, Thorsten
Teubner, Katrin
Twenty years of spatially coherent deepwater warming in lakes across Europe related to the North Atlantic Oscillation
author_facet Dokulil, Martin T.
Jagsch, Albert
George, Glen D.
Anneville, Orlane
Jankowski, Thomas
Wahl, Bernd
Lenhart, Brigitte
Blenckner, Thorsten
Teubner, Katrin
author_sort Dokulil, Martin T.
title Twenty years of spatially coherent deepwater warming in lakes across Europe related to the North Atlantic Oscillation
title_short Twenty years of spatially coherent deepwater warming in lakes across Europe related to the North Atlantic Oscillation
title_full Twenty years of spatially coherent deepwater warming in lakes across Europe related to the North Atlantic Oscillation
title_fullStr Twenty years of spatially coherent deepwater warming in lakes across Europe related to the North Atlantic Oscillation
title_full_unstemmed Twenty years of spatially coherent deepwater warming in lakes across Europe related to the North Atlantic Oscillation
title_sort twenty years of spatially coherent deepwater warming in lakes across europe related to the north atlantic oscillation
publisher Wiley
publishDate 2006
url https://doi.org/10.4319/lo.2006.51.6.2787
genre North Atlantic
North Atlantic oscillation
genre_facet North Atlantic
North Atlantic oscillation
op_relation Limnology and Oceanography--Limnol. Oceanogr.--journals:1929--0024-3590
eawag:5354
journal id: journals:1929
issn: 0024-3590
ut: 000242265700024
local: 10836
scopus: 2-s2.0-33845449918
doi:10.4319/lo.2006.51.6.2787
op_doi https://doi.org/10.4319/lo.2006.51.6.2787
container_title Limnology and Oceanography
container_volume 51
container_issue 6
container_start_page 2787
op_container_end_page 2793
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