Variation in Organic Matter and Water Color in Lake Mälaren 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 Mälaren, Sweden, stretching almo...

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Veröffentlicht in:Ambio 2010-03, Vol.39 (2), p.116-125
Hauptverfasser: Johansson, L, Temnerud, J, Abrahamsson, J, Kleja, D. Berggren
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creator Johansson, L
Temnerud, J
Abrahamsson, J
Kleja, D. Berggren
description 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 Mälaren, 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 Mälaren 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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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; BioOne Complete; Jstor Complete Legacy; PubMed Central; SpringerLink Journals - AutoHoldings
subjects Agricultural Science
Air temperature
Algae
Alkalinity
Analytical chemistry
Aquatic ecosystems
Atmospheric Sciences
Carbon
Chemical oxygen demand
Climate change
Color
Data collection
Earth and Environmental Science
Ecology
Environment
Environmental Engineering/Biotechnology
Environmental Management
Fresh Water - chemistry
Freshwater
Global climate
Hydraulics
Jordbruksvetenskap
Lakes
Limnology
Methods
Organic matter
Physical Geography
Precipitation
Provinces
Rain
Retention
Review Paper
Sedimentation & deposition
Sewage
Sine function
Soil organic matter
Surface water
Sweden
Temperature
Time Factors
Time series
Trends
Water color
Water Movements
Water Pollutants, Chemical - chemistry
Water quality
Water treatment
Water treatment plants
Waterworks
title Variation in Organic Matter and Water Color in Lake Mälaren During the Past 70 Years
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