Long-term trends at the Time Series Station Boknis Eck (Baltic Sea), 1957–2013: does climate change counteract the decline in eutrophication?.

Lennartz, Sinikka T., Lehmann, Andreas, Herrford, Josefine, Malien, Frank, Hansen, Hans Peter, Biester, H. and Bange, Hermann W. (2014) Long-term trends at the Time Series Station Boknis Eck (Baltic Sea), 1957–2013: does climate change counteract the decline in eutrophication?. Open Access Biogeosciences (BG), 11 . pp. 6323-6339. DOI 10.5194/bg-11-6323-2014.

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Abstract

The Boknis Eck (BE) time series station, initiated in 1957, is one of the longest-operated time series stations worldwide. We present the first statistical evaluation of a data set of nine physical, chemical and biological parameters in the period of 1957–2013. In the past three to five decades, all of the measured parameters underwent significant long-term changes. Most striking is an ongoing decline in bottom water oxygen concentration, despite a significant decrease of nutrient and chlorophyll a concentrations. Temperature-enhanced oxygen consumption in the bottom water and a prolongation of the stratification period are discussed as possible reasons for the ongoing oxygen decline despite declining eutrophication. Observations at the BE station were compared with model output of the Kiel Baltic Sea Ice Ocean Model (BSIOM). Reproduced trends were in good agreement with observed trends for temperature and oxygen, but generally the oxygen concentration at the bottom has been overestimated.

Document Type: Article
Additional Information: WOS:000346356800011
Keywords: R/V Littorina; R/V Polarfuchs; COASTAL EUTROPHICATION; OXYGEN DEFICIENCY; MODEL; BIOGEOCHEMISTRY; REGRESSION; WESTERN; WATERS; AREAS; BAY
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-11-6323-2014
ISSN: 1726-4170
Related URLs:
Projects: Boknis Eck, Future Ocean
Date Deposited: 04 Nov 2014 07:55
Last Modified: 13 Jan 2016 12:25
URI: http://oceanrep.geomar.de/id/eprint/25941

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