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 ($2\textdegree 95^\prime W$to$14\textdegree 0^\prime E$,$46\textdegree 27^\prime$to$59\textdegree 00^\prime N$) show a high degree of coherence among lakes, particularly within...

Full description

Saved in:

Bibliographic Details
Published in:	Limnology and oceanography Vol. 51; no. 6; pp. 2787 - 2793
Main Authors:	Dokulil, Martin T., Albert Jagsch, Glen D. George, Anneville, Orlane, Jankowski, Thomas, Bernd Wahl, Brigitte Lenhart, Blenckner, Thorsten, Teubner, Katrin
Format:	Journal Article
Language:	English
Published:	Waco, TX The American Society of Limnology and Oceanography 01-11-2006 American Society of Limnology and Oceanography Association for the Sciences of Limnology and Oceanography
Subjects:	Agricultural sciences Climate change Climate models Earth sciences Earth, ocean, space Exact sciences and technology Freshwater Freshwater ecology Geovetenskap Global warming Hydrology Hydrology. Hydrogeology Lakes Lentic systems Life Sciences Limnology NATURAL SCIENCES NATURVETENSKAP Soil study Surface temperature Temperature Water temperature Great Britain Austria Sweden England United Kingdom North Atlantic Central Europe Scandinavia Switzerland Germany Western Europe ANE, Europe Europe AN, North Atlantic, North Atlantic Oscillation fresh-water environment lacustrine environment Atlantic Ocean Europe mixing warming temperature climate lakes deep-water environment oscillations nutrients NORTH ATLANTIC OSCILLATION
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Twenty to fifty years of annual mean deepwater (hypolimnetic) temperature data from twelve deep lakes spaced across Europe ($2\textdegree 95^\prime W$to$14\textdegree 0^\prime E$,$46\textdegree 27^\prime$to$59\textdegree 00^\prime N$) 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$0.1-0.2\textdegree C$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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0024-3590 1939-5590 1939-5590
DOI:	10.4319/lo.2006.51.6.2787