Diurnal variation of turbulence-related quantities in Lake Garda

W.K. Lenstra, L. Hahn-Woernle, E. Matta, M. Bresciani, C. Giardino, N. Salmaso, M. Musanti, G. Fila, R. Uittenbogaard, M. Genseberger, H.J. van der Woerd, H.A. Dijkstra
  • W.K. Lenstra
    Institute for Marine and Atmospheric Research Utrecht, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Netherlands
  • L. Hahn-Woernle
    Institute for Marine and Atmospheric Research Utrecht, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Netherlands | l.hahn-woernle@uu.nl
  • E. Matta
    Italian National Research Council – Institute for the Electromagnetic Sensing of the Environment, Milano, Italy
  • M. Bresciani
    Italian National Research Council – Institute for the Electromagnetic Sensing of the Environment, Milano, Italy
  • C. Giardino
    Italian National Research Council – Institute for the Electromagnetic Sensing of the Environment, Milano, Italy
  • N. Salmaso
    Sustainable Agro-ecosystems and Bioresources Department, IASMA Research and Innovation Centre, Istituto Agrario de S. Michele all’Adige – Fondazione E. Mach, Trento, Italy
  • M. Musanti
    Italian National Research Council – Institute for the Electromagnetic Sensing of the Environment, Milano, Italy
  • G. Fila
    Italian National Research Council – Institute for the Electromagnetic Sensing of the Environment, Milano, Italy
  • R. Uittenbogaard
    Deltares, Delft, Netherlands
  • M. Genseberger
    Deltares, Delft, Netherlands
  • H.J. van der Woerd
    Institute for Environmental Studies (IVM), Amsterdam, Netherlands
  • H.A. Dijkstra
    Institute for Marine and Atmospheric Research Utrecht, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Netherlands

Abstract

To determine diurnal variations in the physical and biological state of Lake Garda in early spring, high-resolution measurements were made of the vertical distribution of temperature and fluorescence in the upper 100 meters during 5–7 March 2014. In this paper, the results of these measurements are presented and a preliminary analysis that focuses on the connection between the vertical mixing coefficient KT and the chlorophyll-a (chl-a) concentration is given. From these first direct measurements of turbulence-related quantities in Lake Garda, it is found that mixed-layer values of Kdecrease, while surface chl-a concentrations increase, over the day. Variations in Kcan be connected to the changes in the surface wind stress, while variations in chl-a are negatively correlated with the amplitude of KT. In addition, satellite observations of the surface chl-a concentration are analysed to test their use for the calibration of the fluorescence measurements and also for their potential utility in remotely determining vertical mixing in the upper layers of the lake.

Keywords

turbulence, stratification, microstructure profiler, plankton, chlorophyll-a, remote sensing, Lake Garda

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Submitted: 2015-06-08 14:35:40
Published: 2014-12-04 00:00:00
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Copyright (c) 2016 W.K. Lenstra, L. Hahn-Woernle, E. Matta, M. Bresciani, C. Giardino, N. Salmaso, M. Musanti, G. Fila, R. Uittenbogaard, M. Genseberger, H.J. van der Woerd, H.A. Dijkstra

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