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 ?
In early August 2012, air temperatures declined and hypolimnion temperatures converged with those of the epilimnion, eliminating the thermal stratification that had inhibited mixing between the upper and lower zones of the lake (Fig.
During mixing events in 2015 and 2016, there was a decrease in pH in the epilimnion. Specific conductivity fluctuated between 116 and 190 [micro]Si/cm, with lower values in the epilimnion, and a clear chemocline at 20 m depth, which however became deeper with time ([F.sub.1,21] = 30.8; p = 0.00002).
Therefore in the hypothetical scenario presented here, the DBL thickness was estimated to be 0.26 [+ or -] 0.05 mm, covering a wide range of flow regimes, from fast flowing water to slow moving lake epilimnion [6].
Because most phytoplankton taxa have a higher specific mass than water, all nonmotile and negatively buoyant taxa tend to sink out of the epilimnion with time [23].
For example, dissolved oxygen levels ranged from 0.63 mg [L.sup.-1] (in the hypolimnion) to 9.20 mg [L.sup.-1] (in the epilimnion), but over the season from 3.09 to 7.03 mg [L.sup.-1].
In this way,great variation in their diversity is observed, according to the trophic status, seasonality (BUOSI et al., 2011; GOMES; GODINHO, 2003; PAULETO et al., 2009), or even among compartments of the same environment, such as epilimnion and hipolimnion (FINLAY; ESTEBAN, 1998; ZINGEL; OTT, 2000).
Water samples were taken from the epilimnion and hypolimnion in the deepest portion of the lake using a Kemmerer sampler (Clean Lakes Program 2001; EPA 2007).
The TP concentration in the epilimnion and metalimnion varies from 15 to 20 ([micro]g [L.sup.-1], while the total nitrogen (TN) content is about 500 ([micro]g [L-.sup.1].
The results of this study will provide information on the physico--chemical parameters of the lake at the epilimnion.
Its amplitude of water temperature was recorded about 10[degrees]C, difference between epilimnion and hypolimnion layers during thermocline, while it decreased to about 6.5[degrees]C in the SAD and TAD.
El viento sobre la superficie de un lago genera turbulencia en la capa de mezcla, turbulencia que rapidamente transfiere momento al agua, hasta el epilimnion. Si el esfuerzo de viento se mantiene constante durante un determinado tiempo, el agua se mueve como un todo manifestandose un seiche.
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.