Wind drives fast changes of light climate in a large, shallow re-established lake
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Wind drives fast changes of light climate in a large, shallow re-established lake. / Martinsen, Kenneth Thorø; Kragh, Theis; Sand-Jensen, Kaj; Madsen-Østerbye, Mikkel; Kristensen, Emil; Sø, Jonas Stage.
In: Science of the Total Environment, Vol. 806, No. 3, 151354, 2022.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Wind drives fast changes of light climate in a large, shallow re-established lake
AU - Martinsen, Kenneth Thorø
AU - Kragh, Theis
AU - Sand-Jensen, Kaj
AU - Madsen-Østerbye, Mikkel
AU - Kristensen, Emil
AU - Sø, Jonas Stage
N1 - Publisher Copyright: © 2021 The Authors
PY - 2022
Y1 - 2022
N2 - With ever greater frequency, wetlands and shallow lakes that had been diverted for agriculture are being re-established to reduce nutrient loss and greenhouse gas emission, as well as to increase biodiversity. Here, we investigate drivers of water column light attenuation (Kd) at multiple time scales and locations in Lake Fil, Denmark, during the first five years after its re-establishment in 2012. We found that Kd was generally high (overall mean: 3.4 m−1), with resuspended sediment particles and colored dissolved organic matter being the main contributors. Using daily time series of light attenuation recorded at four stations, we used a generalized additive model to analyze the influence of wind speed and direction on Kd. This model explained a high proportion of the variation (R2 = 0.62, RMSE = 0.74 m−1, and MAE = 0.55 m−1) and showed that higher wind speed increased Kd on the same day and, with smaller influence, on the next day. Furthermore, we found a significant influence of wind direction and an interaction between wind speed and wind direction, a combination that suggests that short-term variations in light climate depends on the interplay between wind direction and sources of particles. Wind from non-prevailing directions thus influence Kd more, as it can activate previously deposited particles. The maximum colonization depths of submerged vegetation occurred at ~2–6% of sub-surface light from 2014 to 2016 and peaked at 1.2 m in 2016. The fast, day-to-day variation of Kd in Lake Fil reveals the importance of wind on light climate and in turn biological elements such as phytoplankton and submerged macrophyte development in shallow lakes. The implications are essential for the prior planning and management of future lake re-establishment.
AB - With ever greater frequency, wetlands and shallow lakes that had been diverted for agriculture are being re-established to reduce nutrient loss and greenhouse gas emission, as well as to increase biodiversity. Here, we investigate drivers of water column light attenuation (Kd) at multiple time scales and locations in Lake Fil, Denmark, during the first five years after its re-establishment in 2012. We found that Kd was generally high (overall mean: 3.4 m−1), with resuspended sediment particles and colored dissolved organic matter being the main contributors. Using daily time series of light attenuation recorded at four stations, we used a generalized additive model to analyze the influence of wind speed and direction on Kd. This model explained a high proportion of the variation (R2 = 0.62, RMSE = 0.74 m−1, and MAE = 0.55 m−1) and showed that higher wind speed increased Kd on the same day and, with smaller influence, on the next day. Furthermore, we found a significant influence of wind direction and an interaction between wind speed and wind direction, a combination that suggests that short-term variations in light climate depends on the interplay between wind direction and sources of particles. Wind from non-prevailing directions thus influence Kd more, as it can activate previously deposited particles. The maximum colonization depths of submerged vegetation occurred at ~2–6% of sub-surface light from 2014 to 2016 and peaked at 1.2 m in 2016. The fast, day-to-day variation of Kd in Lake Fil reveals the importance of wind on light climate and in turn biological elements such as phytoplankton and submerged macrophyte development in shallow lakes. The implications are essential for the prior planning and management of future lake re-establishment.
KW - Ecosystem restoration
KW - High-frequency monitoring
KW - Light attenuation
KW - Resuspension
KW - Sediment particles
U2 - 10.1016/j.scitotenv.2021.151354
DO - 10.1016/j.scitotenv.2021.151354
M3 - Journal article
C2 - 34728205
AN - SCOPUS:85118948499
VL - 806
JO - Science of the Total Environment
JF - Science of the Total Environment
SN - 0048-9697
IS - 3
M1 - 151354
ER -
ID: 287061702