Temperature and salt content regimes in three shallow ice-covered lakes 1. Temperature, salt content, and density structure
(1997) In Nordic Hydrology 28(2). p.99-128- Abstract
- A field study on the temperature, salt content, and density regime in three shallow ice-covered Karelian lakes is presented. The measurements show that the heat content increases during the whole ice-covered period. At ice formation a weak stable stratification existed in the lakes, with average temperatures about 1 degrees C. Thereafter, the stability of the stratification gradually increased, mainly due to pronounced temperature increases in the bottom layers. In mid-winter the bottom layer in the deep parts of the lakes obtained temperatures above 4 degrees C. The density stratification in these layers was stable, however, due to higher salt contents (increasing continuously during the winter) in the vicinity of the bottom. The... (More)
- A field study on the temperature, salt content, and density regime in three shallow ice-covered Karelian lakes is presented. The measurements show that the heat content increases during the whole ice-covered period. At ice formation a weak stable stratification existed in the lakes, with average temperatures about 1 degrees C. Thereafter, the stability of the stratification gradually increased, mainly due to pronounced temperature increases in the bottom layers. In mid-winter the bottom layer in the deep parts of the lakes obtained temperatures above 4 degrees C. The density stratification in these layers was stable, however, due to higher salt contents (increasing continuously during the winter) in the vicinity of the bottom. The horizontal variations in temperature and salt content were very small, and both parameters can be considered to be horizontally homogeneous. Under-ice convection was developed in two of the three investigated lakes during the second half of April, when heating due to penetrating solar radiation became apparent. Although no under-ice convection in the conventional sense occurred in the third lake (Uros), interior convection developed when the temperature exceeded 4 degrees C (the temperature of maximum density) there. The absence of under-ice convection in Lake Uros is most likely due to the higher vertical temperature gradient in the lake before spring heating and smaller extinction coefficient than in the other two lakes. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2595364
- author
- Malm, J. LU ; Terzhevik, A. ; Bengtsson, Lars LU ; Boyarinov, P. ; Glinsky, A. ; Palshin, N. and Petrov, M.
- organization
- publishing date
- 1997
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Nordic Hydrology
- volume
- 28
- issue
- 2
- pages
- 99 - 128
- external identifiers
-
- scopus:0031450297
- ISSN
- 0029-1277
- DOI
- 10.2166/nh.1997.0007
- language
- English
- LU publication?
- yes
- id
- 87e0ac48-1672-46a6-b222-feaa4583fd1e (old id 2595364)
- date added to LUP
- 2016-04-01 12:34:19
- date last changed
- 2023-06-27 11:08:21
@article{87e0ac48-1672-46a6-b222-feaa4583fd1e,
abstract = {{A field study on the temperature, salt content, and density regime in three shallow ice-covered Karelian lakes is presented. The measurements show that the heat content increases during the whole ice-covered period. At ice formation a weak stable stratification existed in the lakes, with average temperatures about 1 degrees C. Thereafter, the stability of the stratification gradually increased, mainly due to pronounced temperature increases in the bottom layers. In mid-winter the bottom layer in the deep parts of the lakes obtained temperatures above 4 degrees C. The density stratification in these layers was stable, however, due to higher salt contents (increasing continuously during the winter) in the vicinity of the bottom. The horizontal variations in temperature and salt content were very small, and both parameters can be considered to be horizontally homogeneous. Under-ice convection was developed in two of the three investigated lakes during the second half of April, when heating due to penetrating solar radiation became apparent. Although no under-ice convection in the conventional sense occurred in the third lake (Uros), interior convection developed when the temperature exceeded 4 degrees C (the temperature of maximum density) there. The absence of under-ice convection in Lake Uros is most likely due to the higher vertical temperature gradient in the lake before spring heating and smaller extinction coefficient than in the other two lakes.}},
author = {{Malm, J. and Terzhevik, A. and Bengtsson, Lars and Boyarinov, P. and Glinsky, A. and Palshin, N. and Petrov, M.}},
issn = {{0029-1277}},
language = {{eng}},
number = {{2}},
pages = {{99--128}},
series = {{Nordic Hydrology}},
title = {{Temperature and salt content regimes in three shallow ice-covered lakes 1. Temperature, salt content, and density structure}},
url = {{http://dx.doi.org/10.2166/nh.1997.0007}},
doi = {{10.2166/nh.1997.0007}},
volume = {{28}},
year = {{1997}},
}