Variation in Organic Matter and Water Color in Lake Maelaren During the Past 70 Years

Interest in long time series of organic matter data has recently increased due to concerns about the effects of global climate change on aquatic ecosystems. This study presents and evaluates unique time series of chemical oxygen demand (COD) and water color from Lake Maelaren, Sweden, stretching alm...

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Bibliographic Details
Published inAmbio Vol. 39; no. 2; pp. 116 - 125
Main Authors Johansson, L, Temnerud, J, Abrahamsson, J, Kleja, DBerggren
Format Journal Article
LanguageEnglish
Published 01.03.2010
Subjects
Crack opening displacement
Lakes
North Atlantic oscillation
Oxygen demand
Precipitation
Soils
Time series
Water color
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Summary:Interest in long time series of organic matter data has recently increased due to concerns about the effects of global climate change on aquatic ecosystems. This study presents and evaluates unique time series of chemical oxygen demand (COD) and water color from Lake Maelaren, Sweden, stretching almost seven decades (1935-2004). A negative linear trend was found in COD, but not in water color. The decrease was mainly due to installation of sewage works around 1970. Time series of COD and water color had cyclic pattern. It was strongest for COD, with 23 years periodicity. Similar periodicity observed in air temperature and precipitation in Sweden has been attributed to the North Atlantic Oscillation index and solar system orbit, suggesting that COD in Lake Maelaren is partly derived from algae. Discharge influenced water color more than COD, possibly because water color consists of colored substances brought into the lake from surrounding soils.
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ISSN:0044-7447
1654-7209
DOI:10.1007/s13280-010-0019-2