mixolimnion

mixolimnion

[¦mik·sō′lim·nē‚än]
(hydrology)
The upper layer of a meromictic lake, characterized by low density and free circulation; this layer is mixed by the wind.
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It is a deep (maximum 489m), meromictic lake, with oxic mixolimnion up to 70m and a deep monimolimnion rich in dissolved gases, particularly methane [9].