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Effects of fetch and dissolved organic carbon on epilimnion depth and light climate in small forest lakes in southern Sweden

von Einem, Jessica LU and Granéli, Wilhelm LU (2010) In Limnology and Oceanography 55(2). p.920-930
Abstract
We sampled small (0.03 to 3.3 km(2) surface area) forest lakes in southern Sweden during two summers to investigate how concentration of dissolved organic carbon (DOC) and lake size influence epilimnion depth (z(e)) and light conditions in the epilimnion. z(e) increased with increasing fetch (square root of lake area) but did not decrease with increasing DOC concentration. This suggests greater importance of wind mixing in our study area than in areas with more continental climate, i.e., epilimnion-deepening wind mixing overrides the tendency for epilimnion depth to decrease with increasing DOC concentration. Extinction of photosynthetically active radiation was mainly caused by DOC. The euphotic zone was shallower in the first year than... (More)
We sampled small (0.03 to 3.3 km(2) surface area) forest lakes in southern Sweden during two summers to investigate how concentration of dissolved organic carbon (DOC) and lake size influence epilimnion depth (z(e)) and light conditions in the epilimnion. z(e) increased with increasing fetch (square root of lake area) but did not decrease with increasing DOC concentration. This suggests greater importance of wind mixing in our study area than in areas with more continental climate, i.e., epilimnion-deepening wind mixing overrides the tendency for epilimnion depth to decrease with increasing DOC concentration. Extinction of photosynthetically active radiation was mainly caused by DOC. The euphotic zone was shallower in the first year than in the second, probably because of higher precipitation and lower solar irradiance in 2007, which together led to higher water color. Mean epilimnetic irradiance was low, especially in 2007, mainly because the increase in DOC did not lead to shallower epilimnia. Browning of lakes in southern Sweden, in combination with a predicted increase in the number of storm events, may lead to more severe light limitation of phytoplankton in small, nutrient-poor lakes, since it may not be accompanied by a compensatory shallowing of the epilimnion. As a consequence, lake ecosystems will become more heterotrophic, CO2-evasion to the atmosphere will increase, and fish production decrease. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Limnology and Oceanography
volume
55
issue
2
pages
920 - 930
publisher
ASLO
external identifiers
  • wos:000276440000038
  • scopus:78650462720
ISSN
1939-5590
project
BECC
language
English
LU publication?
yes
id
0fdeda55-6845-49f5-83e7-892263ab1c30 (old id 1603827)
alternative location
http://www.aslo.org/lo/toc/vol_55/issue_2/0920.pdf
date added to LUP
2010-05-17 13:36:14
date last changed
2018-07-01 04:06:16
@article{0fdeda55-6845-49f5-83e7-892263ab1c30,
  abstract     = {We sampled small (0.03 to 3.3 km(2) surface area) forest lakes in southern Sweden during two summers to investigate how concentration of dissolved organic carbon (DOC) and lake size influence epilimnion depth (z(e)) and light conditions in the epilimnion. z(e) increased with increasing fetch (square root of lake area) but did not decrease with increasing DOC concentration. This suggests greater importance of wind mixing in our study area than in areas with more continental climate, i.e., epilimnion-deepening wind mixing overrides the tendency for epilimnion depth to decrease with increasing DOC concentration. Extinction of photosynthetically active radiation was mainly caused by DOC. The euphotic zone was shallower in the first year than in the second, probably because of higher precipitation and lower solar irradiance in 2007, which together led to higher water color. Mean epilimnetic irradiance was low, especially in 2007, mainly because the increase in DOC did not lead to shallower epilimnia. Browning of lakes in southern Sweden, in combination with a predicted increase in the number of storm events, may lead to more severe light limitation of phytoplankton in small, nutrient-poor lakes, since it may not be accompanied by a compensatory shallowing of the epilimnion. As a consequence, lake ecosystems will become more heterotrophic, CO2-evasion to the atmosphere will increase, and fish production decrease.},
  author       = {von Einem, Jessica and Granéli, Wilhelm},
  issn         = {1939-5590},
  language     = {eng},
  number       = {2},
  pages        = {920--930},
  publisher    = {ASLO},
  series       = {Limnology and Oceanography},
  title        = {Effects of fetch and dissolved organic carbon on epilimnion depth and light climate in small forest lakes in southern Sweden},
  volume       = {55},
  year         = {2010},
}