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The effect of water colour on lake hydrodynamics: a modelling study

Persson, Irina; Jones, Ian D.. 2008 The effect of water colour on lake hydrodynamics: a modelling study. Freshwater Biology, 53 (12). 2345-2355. 10.1111/j.1365-2547.2008.02049.x

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Abstract/Summary

1) The one-dimensional equation solver, PROBE, was used to simulate the temperature structure of Lake Erken, a medium-sized Swedish lake, assuming differing extinction coefficients for a series of modelled years driven by observed meteorological data and by a set of idealised meteorological data. 2) Results suggested that, although, as expected, larger extinction coefficients initially led to surface waters becoming warmer, the reverse was true late in the summer, as the warming induced by greater absorption of solar radiation was outweighed by the cooling effects of entrainment of colder hypolimnetic water. 3) There was between a two- and fourfold inter-annual variation in the effects on key physical lake parameters, induced by changing extinction coefficient, such as maximum heat flux, heat content and Schmidt stability. 4) The change in surface heat flux induced by a change in extinction coefficient was up to almost 50 Wm-2. 5) In the summer, changes in extinction coefficient from 0.5 m-1 to 0.2 m-1 led to a dramatic shift in the duration of the stratified period as well as to enormous changes in Schmidt stability and hypolimnetic temperature. 6) Future changes to extinction coefficients of small and medium-sized lakes are likely to have wide ranging effects on the lakes’ thermal structure and ecology.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1365-2547.2008.02049.x
Programmes: CEH Programmes pre-2009 publications > Water > CC01A Detection and Attribution of Change in UK and European Ecosystems > CC01.2 Lake Ecosystems
CEH Programmes pre-2009 publications > Water > WA02 Quantifying processes that link water quality and quantity, biota and physical environment > WA02.3 Physico-chemical processes and effects on freshwater biot
CEH Programmes pre-2009 publications > Water > WA03 Developing strategic data and knowledge at a catchment scale to enable the wiser management of the water environment > WA03.2 Long term monitoring
CEH Programmes pre-2009 publications > Water
CEH Sections: Parr
ISSN: 0046-5070
Additional Keywords: PROBE, extinction coefficient, climate, stratification, heat fluxes, lake
NORA Subject Terms: Meteorology and Climatology
Ecology and Environment
Date made live: 08 Dec 2008 15:50
URI: http://nora.nerc.ac.uk/id/eprint/5005

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