Effects of an extreme precipitation event on water chemistry and phytoplankton in the Swedish Lake Mälaren
Extreme events can often be ecologically more relevant than fluctuations in the mean climate. We studied the effects of an exceptionally rainy period in 2000 on 13 physical and chemical variables and on the phytoplankton biomass and composition in Lake Mälaren, the third largest lake in Sweden. The...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/578252 2024-09-15T18:00:09+00:00 Effects of an extreme precipitation event on water chemistry and phytoplankton in the Swedish Lake Mälaren Weyhenmeyer, G. A. Willén, E. Sonesten, L. 2024-06-27T13:44:51Z 409-420 application/pdf http://hdl.handle.net/10138/578252 eng eng Boreal Environment Research Publishing Board Boreal Environment Research 1239-6095 1797-2469 5 9 http://hdl.handle.net/10138/578252 Suomen ympäristökeskus CC BY 4.0 openAccess Artikkeli lehdessä 2024 ftunivhelsihelda 2024-08-21T23:48:04Z Extreme events can often be ecologically more relevant than fluctuations in the mean climate. We studied the effects of an exceptionally rainy period in 2000 on 13 physical and chemical variables and on the phytoplankton biomass and composition in Lake Mälaren, the third largest lake in Sweden. The rainy period caused a distinct increase in the chemical loading, in particular the loading of organic carbon, into Lake Mälaren. As a consequence water color, measured as light absorption of filtered water, was up to 3.4 times higher in 2001 than ever recorded since 1965. In addition, reactive silica concentrations doubled, particle concentrations were the highest and conductivity was the lowest registered. The changes in physical and chemical conditions of Lake Mälaren in 2001 showed temporal and spatial differences depending on runoff processes in the catchment, water residence times and the type of variable. It is suggested that especially the increase in water color was responsible for the observed doubling in the cryptophycean biomass in Lake Mälaren in May 2001. The increase in water color and cryptophycean biomass was also observed in a nearby lake. Such increases required alterations in the treatment process of raw water from Lake Mälaren for the drinking water supply of Stockholm city. Article in Journal/Newspaper Boreal Environment Research HELDA – University of Helsinki Open Repository |
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Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
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ftunivhelsihelda |
language |
English |
description |
Extreme events can often be ecologically more relevant than fluctuations in the mean climate. We studied the effects of an exceptionally rainy period in 2000 on 13 physical and chemical variables and on the phytoplankton biomass and composition in Lake Mälaren, the third largest lake in Sweden. The rainy period caused a distinct increase in the chemical loading, in particular the loading of organic carbon, into Lake Mälaren. As a consequence water color, measured as light absorption of filtered water, was up to 3.4 times higher in 2001 than ever recorded since 1965. In addition, reactive silica concentrations doubled, particle concentrations were the highest and conductivity was the lowest registered. The changes in physical and chemical conditions of Lake Mälaren in 2001 showed temporal and spatial differences depending on runoff processes in the catchment, water residence times and the type of variable. It is suggested that especially the increase in water color was responsible for the observed doubling in the cryptophycean biomass in Lake Mälaren in May 2001. The increase in water color and cryptophycean biomass was also observed in a nearby lake. Such increases required alterations in the treatment process of raw water from Lake Mälaren for the drinking water supply of Stockholm city. |
format |
Article in Journal/Newspaper |
author |
Weyhenmeyer, G. A. Willén, E. Sonesten, L. |
spellingShingle |
Weyhenmeyer, G. A. Willén, E. Sonesten, L. Effects of an extreme precipitation event on water chemistry and phytoplankton in the Swedish Lake Mälaren |
author_facet |
Weyhenmeyer, G. A. Willén, E. Sonesten, L. |
author_sort |
Weyhenmeyer, G. A. |
title |
Effects of an extreme precipitation event on water chemistry and phytoplankton in the Swedish Lake Mälaren |
title_short |
Effects of an extreme precipitation event on water chemistry and phytoplankton in the Swedish Lake Mälaren |
title_full |
Effects of an extreme precipitation event on water chemistry and phytoplankton in the Swedish Lake Mälaren |
title_fullStr |
Effects of an extreme precipitation event on water chemistry and phytoplankton in the Swedish Lake Mälaren |
title_full_unstemmed |
Effects of an extreme precipitation event on water chemistry and phytoplankton in the Swedish Lake Mälaren |
title_sort |
effects of an extreme precipitation event on water chemistry and phytoplankton in the swedish lake mälaren |
publisher |
Boreal Environment Research Publishing Board |
publishDate |
2024 |
url |
http://hdl.handle.net/10138/578252 |
genre |
Boreal Environment Research |
genre_facet |
Boreal Environment Research |
op_relation |
Boreal Environment Research 1239-6095 1797-2469 5 9 http://hdl.handle.net/10138/578252 Suomen ympäristökeskus |
op_rights |
CC BY 4.0 openAccess |
_version_ |
1810437280529121280 |