Complex effects of winter warming on the physicochemical characteristics of a deep lake
Recent winter warming over Central Europe associated with a positive phase of the North Atlantic Oscillation (NAO) strongly influenced the thermal and water column stability properties of deep Lake Constance (zmean = 101 m).Volumet- rically weighted average water temperatures have increased since th...
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ftubkonstanz:oai:kops.uni-konstanz.de:123456789/7872 2024-02-11T10:06:17+01:00 Complex effects of winter warming on the physicochemical characteristics of a deep lake Straile, Dietmar Jöhnk, Klaus D. Rossknecht, Henno 2003 application/pdf http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-38387 https://doi.org/10.4319/lo.2003.48.4.1432 eng eng http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-38387 http://dx.doi.org/10.4319/lo.2003.48.4.1432 272995312 http://creativecommons.org/licenses/by-nc-nd/2.0/ Limnology and Oceanography. 2003, 48(4), pp. 1432-1438. eISSN 0024-3590. Available under: doi:10.4319/lo.2003.48.4.1432 North Atlantic Oscillation monomictic lake winter warming Lake Constance trophic changes eutrophication ddc:570 doc-type:article doc-type:Text 2003 ftubkonstanz https://doi.org/10.4319/lo.2003.48.4.1432 2024-01-21T23:52:11Z Recent winter warming over Central Europe associated with a positive phase of the North Atlantic Oscillation (NAO) strongly influenced the thermal and water column stability properties of deep Lake Constance (zmean = 101 m).Volumet- rically weighted average water temperatures have increased since the 1960s by an average of 0.017 degree C yr-1, and its interannual variability was strongly related to the variability in winter air temperature and the NAO winter index (NAOW). The influence of NAOw on water temperature was more persistent than its influence on air temperature. The seasonal persistence of the NAOw signal increased with water depth. Deep-water temperatures were related to the NAOw from one spring mixing period to the next. This caused a time lag of 1 yr in the response of deep-water winter temperatures to the NAOw. Reduced winter cooling during high-NAOw years resulted in the persistence of small temperature gradients that possibly resisted complete mixing. This, in turn, resulted in less upward mixing of nutrients (total phosphorus and total silica), which accumulated in the hypolimnion during the previous stratification period. A second effect of incomplete mixing was the lack of the replenishment of deepwater oxygen during high-NAOw years. Hence, besides its strong impact on the thermal regime, climate variability influenced both the causes (nutrient supply for phytoplankton growth) and symptoms (the degree of hypolimnetic oxygen deficiency) of trophic changes in Lake Constance. published published Article in Journal/Newspaper North Atlantic North Atlantic oscillation KOPS - The Institutional Repository of the University of Konstanz Limnology and Oceanography 48 4 1432 1438 |
institution |
Open Polar |
collection |
KOPS - The Institutional Repository of the University of Konstanz |
op_collection_id |
ftubkonstanz |
language |
English |
topic |
North Atlantic Oscillation monomictic lake winter warming Lake Constance trophic changes eutrophication ddc:570 |
spellingShingle |
North Atlantic Oscillation monomictic lake winter warming Lake Constance trophic changes eutrophication ddc:570 Straile, Dietmar Jöhnk, Klaus D. Rossknecht, Henno Complex effects of winter warming on the physicochemical characteristics of a deep lake |
topic_facet |
North Atlantic Oscillation monomictic lake winter warming Lake Constance trophic changes eutrophication ddc:570 |
description |
Recent winter warming over Central Europe associated with a positive phase of the North Atlantic Oscillation (NAO) strongly influenced the thermal and water column stability properties of deep Lake Constance (zmean = 101 m).Volumet- rically weighted average water temperatures have increased since the 1960s by an average of 0.017 degree C yr-1, and its interannual variability was strongly related to the variability in winter air temperature and the NAO winter index (NAOW). The influence of NAOw on water temperature was more persistent than its influence on air temperature. The seasonal persistence of the NAOw signal increased with water depth. Deep-water temperatures were related to the NAOw from one spring mixing period to the next. This caused a time lag of 1 yr in the response of deep-water winter temperatures to the NAOw. Reduced winter cooling during high-NAOw years resulted in the persistence of small temperature gradients that possibly resisted complete mixing. This, in turn, resulted in less upward mixing of nutrients (total phosphorus and total silica), which accumulated in the hypolimnion during the previous stratification period. A second effect of incomplete mixing was the lack of the replenishment of deepwater oxygen during high-NAOw years. Hence, besides its strong impact on the thermal regime, climate variability influenced both the causes (nutrient supply for phytoplankton growth) and symptoms (the degree of hypolimnetic oxygen deficiency) of trophic changes in Lake Constance. published published |
format |
Article in Journal/Newspaper |
author |
Straile, Dietmar Jöhnk, Klaus D. Rossknecht, Henno |
author_facet |
Straile, Dietmar Jöhnk, Klaus D. Rossknecht, Henno |
author_sort |
Straile, Dietmar |
title |
Complex effects of winter warming on the physicochemical characteristics of a deep lake |
title_short |
Complex effects of winter warming on the physicochemical characteristics of a deep lake |
title_full |
Complex effects of winter warming on the physicochemical characteristics of a deep lake |
title_fullStr |
Complex effects of winter warming on the physicochemical characteristics of a deep lake |
title_full_unstemmed |
Complex effects of winter warming on the physicochemical characteristics of a deep lake |
title_sort |
complex effects of winter warming on the physicochemical characteristics of a deep lake |
publishDate |
2003 |
url |
http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-38387 https://doi.org/10.4319/lo.2003.48.4.1432 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Limnology and Oceanography. 2003, 48(4), pp. 1432-1438. eISSN 0024-3590. Available under: doi:10.4319/lo.2003.48.4.1432 |
op_relation |
http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-38387 http://dx.doi.org/10.4319/lo.2003.48.4.1432 272995312 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/2.0/ |
op_doi |
https://doi.org/10.4319/lo.2003.48.4.1432 |
container_title |
Limnology and Oceanography |
container_volume |
48 |
container_issue |
4 |
container_start_page |
1432 |
op_container_end_page |
1438 |
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1790603895686299648 |