Transactions of KarRC RAS :: Scientific publications
Transactions of KarRC RAS :: Scientific publications

Transactions of KarRC RAS :: Scientific publications
Karelian Research Centre of RAS
ISSN (print): 1997-3217
ISSN (online): 2312-4504
Transactions of KarRC RAS :: Scientific publications
Background Editorial committee Editorial Office For authors For reviewer Russian version
Transactions of KarRC RAS :: Scientific publications

Electronic Journal OJS



Series

Biogeography

Experimental Biology

Mathematical Modeling and Information Technologies

Precambrian Geology

Ecological Studies

Limnology and Oceanology

Research in the Humanities (2010-2015)

Region: Economy and Management (2012-2015)



Issues

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

1999-2008


SCIENTIFIC PUBLICATIONS
.. , .. , .. , .. , .. , .. , .. .
//  . No 5. . . 2016. C. 3-12
G.E. Zdorovennova, R.E Zdorovennov., .. Palshin, T.V. Efremova, G.G. Gavrilenko, S.R. Bogdanov, A.Yu. Terzhevik. Thermal regime of a shallow lake in winter // Transactions of Karelian Research Centre of Russian Academy of Science. No 5. Limnology. 2016. Pp. 3-12
Keywords: water temperature; shallow lake; fluctuations; ice-covered period; heat flux
The thermodynamics of the water column and the bottom layer of a small shallow lake Vendyurskoe were identified from the analysis of temperature measurements by high resolution equipment during the winter 2014-2015. Estimates of the heat flux from the bottom sediments into the water revealed a sharp decrease in its value from 2-5 Wm-2 before lake freezing up to 1-1.5 Wm-2 in the first days of the ice-covered period, and then a slow decrease to 0.4 Wm-2 by the end of the winter. Temperature oscillations of different amplitudes and periods are observed against the background of its seasonal increase. The oscillations ΔT varied with time and depth in a wide range, with areas of "background" values of a few thousandths of a degree alternating with "active" intervals where ΔT value increased by an order of magnitude or more. The sharpest changes in near-bottom temperature led to an increase in the heat flux from the background values of 0.5-1.1 Wm-2 to 3-5 Wm-2. "Background" temperature oscillations corresponded to 1-2 mm vertical displacement of the isotherms, and vertical rates of about 10-5 ms-1, whereas active oscillations corresponded to displacements of up to several cm and rates 1-2 orders of magnitude higher. "Active" intervals were observed when atmospheric forcing on the lake (sharp fluctuations of atmospheric pressure and wind intensification) increased. Significant fluctuations of the depth of isotherms and the dependence of the temperature oscillation amplitude on the depth suggest they are of baroclinic nature, i.e. may be caused by internal waves in a stratified lake.
Indexed at RSCI


  Last modified: June 1, 2016