(redirected from Metalimnion)
Also found in: Medical, Encyclopedia.


1. An intermediate layer of oceanic water in which temperature decreases more rapidly with depth than in the layers above and below it.
2. A layer in a large body of water, such as a lake, that sharply separates regions differing in temperature, so that the temperature gradient across the layer is abrupt.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Physical Geography) a temperature gradient in a thermally stratified body of water, such as a lake
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈθɜr məˌklaɪn)

a layer of water in an ocean or certain lakes, where the temperature gradient is greater than that of the warmer layer above and the colder layer below.
[1895–1900; thermo- + Greek klinē bed]
ther`mo•clin′al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Planktothrix agardhii frequently forms large perennial metalimnion populations in shallow eutrophic reservoirs around the world (Bonilla et al., 2012).
At metalimnion level of thermal stratification ([S.sub.t] = 0.5), when [xi] = 0.07, [epsilon] = 0.1,13 = 0.1, [E.sub.c] = 0.3, [H.sub.a] = 0.25, [GAMMA] = 1, n = 0.09, [P.sub.r[infinity]] = 1, [delta] = 0.2, [chi] = 0.3, and [G.sub.t] = 1, it is worth noting that both vertical and horizontal velocities decrease with m; see Figures 2 and 3.
Warm circulating water erodes the upper portion of the metalimnion. During summer, calm warm days restore this layer.
In fact, it has been suggested that the sediment in shallow lakes is equivalent to the metalimnion in deep lakes (Olah, 1975).
It was also observed high values of these attributes for species of the orders Oligothrichida and Scuticociliata, all important in the metalimnion and hypolimnion of stratified lakes (ZINGEL, 2005).
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 mean annual temperature ranges in the epilimnion, metalimnion, and hypolimnion of Boulder Basin of Lake Mead are between 12-27[degrees]C, 12-18[degrees]C, and 12-12.5[degrees]C, respectively (LaBounty & Burns 2005).
The sharpest and the most long-term increase in EC was registered in the metalimnion, from 2.6 to 7.6 m.
cornuta vivir en zonas segregadas para otros cladoceros, como por ejemplo el metalimnion (Matsumura-Tundisi et al., 1984; Coraspe, 1985), donde enfrenta una menor calidad de alimento, asi como una menor temperatura.
The zone of decreasing temperatures in midwater, which includes the thermocline, is the metalimnion.