Record details

Title
    Temperature fluctuations underneath the ice in Diamond Lake, Hennepin County, Minnesota
Author
    Dědeček, Petr
    Fischer, T.
    Kletetschka, Günther
    Mls, J.
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Water Resources Research
Vol./nr.
    Roč. 49, č. 6
Pages
    s. 3306-3313
Year
    2013
Notes
    Projekt: IAA300120905, GA AV ČR3cav_un_auth*0252830
    Rozsah: 8 s. : E
    Výzkumný záměr: CEZ:AV0Z30120515
    Výzkumný záměr: CEZ:AV0Z30130516
Subject category
    baroclinic seiches
    ground water
    Lacustrine ice
    Lacustrine temperature
    Lacustrine water
    tides
Keyword
    County
    Diamond
    Fluctuations
    Hennepin
    Ice
    Lake
    Minnesota
    Temperature
    Underneath
Abstract (in english)
   Diamond Lake in Minnesota is covered every winter with ice and snow providing a modified thermal insulation between water and air. Autonomous temperature sensors, data loggers, were placed in this lake so that hourly measurements could be obtained from the snow-covered ice and water. The sensors that became frozen measured damped and delayed thermal response from the air-temperature fluctuation. Those sensors that were deeper within the snow-covered ice measured continuous, almost constant, temperature values near freezing. Several of them were within the liquid water and responded with a fluctuation of 24 h periods of amplitudes up to 0.2°C. Our analysis of the vertical temperature profiles suggested that the source of periodic water heating comes from the lake bottom. Because of the absence of daily temperature variations of the snow-covered ice, the influence of the air-temperature fluctuation can be ruled out.
   We attribute the heating process to the periodic inflow of groundwater to the lake and the cooling to the heat diffusion to the overlying ice cover. The periodic groundwater inflow is interpreted due to solid Earth tides, which cause periodic fluctuations of the groundwater pressure head.
Contributor
    AV ČR Brno, Geologický ústav
Contributor code
    AV ČR, GLÚ
Source format
    U
Import date
    23. 10. 2014