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Long-term trends in Secchi depth in the Baltic Sea
SMHI, Research Department, Oceanography.
1996 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 41, no 2, p. 346-351Article in journal (Refereed) Published
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Abstract [en]

Nutrient loads to the Baltic Sea have increased during the last century, and primary production has probably also risen. However, the evidence of such a rise is circumstantial, and most of the available findings concerning primary production cover only brief time periods. A more appropriate type of data in this area is Secchi disk measurements. We present the results of trend tests applied to Secchi depth values recorded during two discrete time periods: 1919-1939 and 1969-1991. We performed a step trend test to compare the data from the two periods and applied a monotonic trend test to the later series. Both tests showed that Secchi depth decreased by similar to 0.05 m yr(-1) during both periods. Calculations of changes in chlorophyll concentrations suggest a yearly increase of similar to 1%. Extending the calculations to represent primary production indicates an increase of slightly <1% yr(-1). These calculations, however, are unreliable due to substantial uncertainty regarding the relationships between Secchi depth and chlorophyll concentration and chlorophyll and primary production.

Place, publisher, year, edition, pages
SWEDISH METEOROL & HYDROL INST, S-60176 NORRKOPING, SWEDEN., 1996. Vol. 41, no 2, p. 346-351
National Category
Oceanography, Hydrology and Water Resources
Research subject
Oceanography
Identifiers
URN: urn:nbn:se:smhi:diva-1641ISI: A1996UK85000016OAI: oai:DiVA.org:smhi-1641DiVA, id: diva2:897774
Available from: 2016-01-26 Created: 2015-12-22 Last updated: 2018-01-10Bibliographically approved

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