Repository: Freie Universität Berlin, Math Department

Evolution of Superficial Lake Water Temperature Profile Under Diurnal Radiative Forcing

Vercauteren, N. and Huwald, H. and Bou-Zeid, E. and Selker, J. S. and Lemmin, U. and Parlange, M. B. and Lunati, I. (2011) Evolution of Superficial Lake Water Temperature Profile Under Diurnal Radiative Forcing. Water Resources Research, 47 (9).

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Official URL: http://onlinelibrary.wiley.com/doi/10.1029/2011WR0...

Abstract

In lentic water bodies, such as lakes, the water temperature near the surface typically increases during the day, and decreases during the night as a consequence of the diurnal radiative forcing (solar and infrared radiation). These temperature variations penetrate vertically into the water, transported mainly by heat conduction enhanced by eddy diffusion, which may vary due to atmospheric conditions, surface wave breaking, and internal dynamics of the water body. These two processes can be described in terms of an effective thermal diffusivity, which can be experimentally estimated. However, the transparency of the water (depending on turbidity) also allows solar radiation to penetrate below the surface into the water body, where it is locally absorbed (either by the water or by the deployed sensors). This process makes the estimation of effective thermal diffusivity from experimental water temperature profiles more difficult. In this study, we analyze water temperature profiles in a lake with the aim of showing that assessment of the role played by radiative forcing is necessary to estimate the effective thermal diffusivity. To this end we investigate diurnal water temperature fluctuations with depth. We try to quantify the effect of locally absorbed radiation and assess the impact of atmospheric conditions (wind speed, net radiation) on the estimation of the thermal diffusivity. The whole analysis is based on the results of fiber optic distributed temperature sensing, which allows unprecedented high spatial resolution measurements (∼4 mm) of the temperature profile in the water and near the water surface.

Item Type:Article
Subjects:Mathematical and Computer Sciences > Mathematics > Applied Mathematics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group
ID Code:1336
Deposited By: Ulrike Eickers
Deposited On:22 Nov 2013 15:16
Last Modified:22 Nov 2013 15:16

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