epilimnion


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epilimnion

[‚ep·ə′lim·nē‚än]
(hydrology)
A fresh-water zone of relatively warm water in which mixing occurs as a result of wind action and convection currents.
References in periodicals archive ?
The concentration of dissolved nitrogen inorganic forms were usually below the detection level (Table 1) in the epilimnion, and all three forms usually reached higher values below 10 m depth.
Extreme pH value shifts were observed in Indian Lake during 2005, which showed the largest range between the epilimnion and hypolimnion (Table 3).
Its amplitude of water temperature was recorded about 10[degrees]C, difference between epilimnion and hypolimnion layers during thermocline, while it decreased to about 6.
The eutrophic status of the water mass, the shallow depth of the basin and the high density of aquatic vegetation, allow an increase in oxygen concentrations in the epilimnion during the day and a fast reduction during the night.
All lakes are dimictic and a strong thermal stratification develops in summer, while the depth of the epilimnion stays rather constant at about 2-4 m.
littoral zone [] epilimnion [] profundal zone [] limnetic zone
Lake water nearest the surface is the warmest (in sum met anyway); this upper layer is called the epilimnion and the temperature is fairly uniform.
Studies have shown that abundances are usually highest in the epilimnion in both Lake Ontario (Ojaveer and others 2001) and the Gulf of Finland (Krylov and others 1999).
The lake was stratified throughout the summer, with the boundary between the epilimnion and the hypolimnion at a depth of 1 to 2 meters.
We collected data to determine if the thermocline in a small freshwater system might influence sediment flux; if so, it suggests that nutrients may be more effectively recycled in the epilimnion than has been suspected previously.
At the transition between the epilimnion and hypolimnion, the temperature of the water falls sharply (sometimes several degrees), and this transition is called the thermocline.