DOI: 10.5194/hess-24-3399-2020
论文题名: Evolution and dynamics of the vertical temperature profile in an oligotrophic lake
作者: Klaić Z.B. ; Babić K. ; Orlić M.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 7 起始页码: 3399
结束页码: 3416
语种: 英语
Scopus关键词: Heat flux
; Stream flow
; Topography
; Water waves
; Wind
; Atmospheric forcing
; Diurnal oscillations
; Diurnal periodicity
; Lake current
; Lake temperatures
; Observation Period
; Oligotrophic lakes
; Vertical temperature profile
; Lakes
; atmospheric forcing
; heat flux
; karst
; lacustrine environment
; lake water
; pycnocline
; temperature profile
; thermocline
; water temperature
; Croatia
; Lake kozjak
英文摘要: 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 10m at the beginning of the observation period to 16m 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 1m above the thermocline. On average, thermocline deepening was 3 4 cmd-1, while the maximum deepening (12.5 cmd-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. Continuous heat fluxes (1) produced forced diurnal oscillations in the lake temperature within the first 5m of the lake throughout the entire observation period. Noncontinuous periodic stronger winds (2) resulted in occasional forced diurnal oscillations in the lake temperatures at depths from approximately 7 to 20 m. Occasional strong and steady along-basin winds (3) triggered both baroclinic internal seiches with a principal period of 8.0 h and barotropic surface seiches with a principal period of 9 min. Lake currents produced by the surface seiches under realistic-topography conditions generated baroclinic oscillations of the thermocline region (at depths from 9 to 17 m) with periods corresponding to the period of surface seiches (- 9 min), which, to the best of our knowledge, has not been reported in previous lake studies. © 2020 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162650
Appears in Collections: 气候变化与战略
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作者单位: Klaić, Z.B., Department of Geophysics, Faculty of Science, University of Zagreb, Zagreb, 10000, Croatia; Babić, K., Department of Geophysics, Faculty of Science, University of Zagreb, Zagreb, 10000, Croatia, Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Karlsruhe, 76344, Germany; Orlić, M., Department of Geophysics, Faculty of Science, University of Zagreb, Zagreb, 10000, Croatia
Recommended Citation:
Klaić Z.B.,Babić K.,Orlić M.. Evolution and dynamics of the vertical temperature profile in an oligotrophic lake[J]. Hydrology and Earth System Sciences,2020-01-01,24(7)