Preprints
https://doi.org/10.5194/gmd-2021-118
https://doi.org/10.5194/gmd-2021-118

Submitted as: model description paper 16 Jun 2021

Submitted as: model description paper | 16 Jun 2021

Review status: this preprint is currently under review for the journal GMD.

SIMO v1.0: Simplified model of the vertical temperature profile in a small warm monomictic lake

Kristina Šarović and Zvjezdana Klaić Kristina Šarović and Zvjezdana Klaić
  • Department of Geophysics, Faculty of Science, University of Zagreb, Zagreb, 10000, Croatia

Abstract. A simple 1-D energy budget model (SIMO) for the prediction of the vertical temperature profiles in small, monomictic lakes forced by a reduced number of input meteorological variables is proposed. The model estimates the net heat flux and thermal diffusion using only routinely measured hourly mean meteorological variables (namely, the air temperature, relative humidity, atmospheric pressure, wind speed, and precipitation), hourly mean ultraviolet B radiation (UVB), and climatological monthly mean cloudiness data. Except for the initial vertical temperature profile, the model does not use any lake-specific variables. The model performance was evaluated against lake temperatures measured continuously during an observational campaign in two lakes belonging to the Plitvice Lakes, Croatia (Lake 1 and Lake 12). Temperatures were measured at 15 and 16 depths ranging from 0.2 to 27 in Lake 1 (maximum depth of 37.4 m) and 0.2 to 43 m in Lake 12 (maximum depth of 46 m). A sensitivity analysis of the simulation length was performed for simulation lengths from 1 to 30 days. The model performed reasonably well and it was able to satisfactorily reproduce the vertical temperature profile at the hourly scale, the deepening of the thermocline with time, and the annual variation in the vertical temperature profile. A yearlong simulation initiated with an approximately constant vertical profile of the lake temperature (≈ 4 °C) was able to reproduce the onset of stratification and convective overturn. However, the thermocline depth was underestimated while the epilimnion temperatures were overestimated. Nevertheless, the values of the model performance measures obtained for a yearlong simulation were comparable with those reported for other more complex models. Thus, the presented model can be used for the assessment of the onset and duration of lake stratification periods when water temperature data are unavailable, which can be useful for various lake studies performed in other scientific fields, such as biology, geochemistry, and sedimentology.

Kristina Šarović and Zvjezdana Klaić

Status: open (until 25 Aug 2021)

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Kristina Šarović and Zvjezdana Klaić

Model code and software

SIMO v1.0: Simplified model of the vertical temperature profile in a small warm monomictic lake Šarović, Kristina; Klaić, Zvjezdana https://doi.org/10.5281/zenodo.4679796

Kristina Šarović and Zvjezdana Klaić

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Short summary
Development of a simple 1-D model for the prediction of the vertical temperature profiles in small warm lakes. The model uses routinely measured hourly mean meteorological variables, and ultraviolet B radiation and cloudiness data. It can be used for the assessment of the onset and duration of lake stratification periods when water temperature data are unavailable, which can be useful for various lake studies performed in other scientific fields, such as biology, geochemistry, and sedimentology.