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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Online Access: | https://doi.org/10.4319/lo.2006.51.6.2787 |
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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 |
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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 |
_version_ |
1810462370543173632 |