# Evolution and dynamics of the vertical temperature profile in an oligotrophic lake

Klaić, Zvjezdana B.; Babić, Karmen; Orlić, Mirko

##### Abstract:
In this study, the fine-scale responses of a stratified oligotrophic karstic lake (Kozjak Lake, Plitvice Lakes, Croatia; the lake fetch is 2.3 km, and the maximum depth is 46 m) to atmospheric forcing on the lake surface are investigated. Lake temperatures measured at a resolution of 2 min at 15 depths ranging from 0.2 to 43 m, which were observed during the 6 July–5 November 2018 period, were analyzed. The results show thermocline deepening from 10 m at the beginning of the observation period to 16 m at the end of the observation period, where the latter depth corresponds to approximately one-third of the lake depth. The pycnocline followed the same pattern, except that the deepening occurred throughout the entire period approximately 1 m above the thermocline. On average, thermocline deepening was 3–4 cm d$^{-1}$, while the maximum deepening (12.5 cm d$^{-1}$) coincided with the occurrence of internal seiches. Furthermore, the results indicate three different types of forcings on the lake surface; two of these forcings have diurnal periodicity – (1) continuous heat fluxes and (2) occasional periodic stronger winds – whereas forcing (3) corresponds to occasional nonperiodic stronger winds with steady along-basin directions. ... mehr

 Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)KIT-Zentrum Klima und Umwelt (ZKU) Publikationstyp Zeitschriftenaufsatz Publikationsjahr 2020 Sprache Englisch Identifikator ISSN: 1607-7938 KITopen-ID: 1000122307 HGF-Programm 12.01.02 (POF III, LK 01) Proc.res.f.multisc.predictab.of weather Erschienen in Hydrology and earth system sciences Verlag Copernicus Publications Band 24 Heft 7 Seiten 3399–3416 Vorab online veröffentlicht am 03.07.2020 Nachgewiesen in Web of ScienceDimensionsScopus
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