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epilimnion
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epilimnion
epilimnion (ɛpɪˈlɪmnɪən) Pl. epilimnia. [f. epi- + Gr. λιµνίον, dim. of λίµνη lake.] The upper, uniformly warm layer of water in a stratified lake: cf. hypolimnion. Hence epilimˈnetic [cf. Gr. λιµνήτης living in marshes], epiˈlimnial adjs., situated in or relating to the epilimnion.1910 E. A. Birge ...
Oxford English Dictionary
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Epilimnion
Physical Structure
Properties
In the water column, the epilimnion sits above all other layers. The epilimnion is only present in stratified lakes. the water and a shallower epilimnion.
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hypolimnion
hypolimnion (haɪpəʊˈlɪmnɪən) Pl. hypolimnia. [f. hypo- 2 + Gr. λιµνίον, dim. of λίµνη lake.] The lower, cooler layer of water below the thermocline in a stratified lake.1910, 1936 [see epilimnion]. 1957 G. E. Hutchinson Treat. Limnol. I. v. 341 The hypolimnia of all lakes. 1960 New Scientist 31 Mar....
Oxford English Dictionary
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Hypolimnion
The cooling of the epilimnion during the fall reduces lake stratification and allows for mixing to occur. In the absence of oxygen from the epilimnion, decomposition can cause hypoxia in the hypolimnion.
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monimolimnion
monimolimnion (ˌmɒnɪməʊˈlɪmnɪən) Pl. -limnia. [a. G. monimolimnion (I. Findenegg 1935, in Internat. Rev. d. ges. Hydrobiol. u. Hydrographie XXXII. 377), f. Gr. µόνιµο-ς stable + -limnion, after epilimnion, hypolimnion.] The lower, denser, non-circulating layer of a meromictic lake. Cf. mixolimnion.1...
Oxford English Dictionary
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Gloeotrichia
However, summer stratification in the water column keeps the P from circulating to the epilimnion, or upper layers. As Gloeotrichia migrate, the percentage of P in the epilimnion due to Gloeotrichia increases from 1% to 53%.
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mixolimnion
mixolimnion (mɪksəʊˈlɪmnɪən) Pl. -limnia. [f. mixo- + -limnion, after epilimnion, hypolimnion.] The upper, freely circulating layer of a meromictic lake. Cf. monimolimnion.1937 G. E. Hutchinson in Trans. Connecticut Acad. Arts & Sci. XXXIII. 74 A meromictic lake may be regarded as consisting of an u...
Oxford English Dictionary
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Dimictic lake
and a still-warmer unfrozen bottom layer, while during summer, the same temperature-derived density differences separate the warm surface waters (the epilimnion This results in dimictic lakes have a strong thermal stratification, with a warm epilimnion separated from the cold hypolimnion by the metalimnion.
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metalimnion
metalimnion (mɛtəˈlɪmnɪən) Pl. -limnia. [f. meta- + Gr. λιµνίον, dim. of λίµνη lake.] The layer of water in a stratified lake which lies beneath the epilimnion and above the hypolimnion and in which the temperature decreases rapidly with depth. So metalimˈnetic a. [cf. Gr. λιµνήτης living in marshes...
Oxford English Dictionary
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Monomictic lake
In both cold and warm monomictic lakes, the epilimnion and hypolimnion are separated for a majority of the year. This addition to the hypolimnion also reduces mixing of the water column and dispersal of nutrients to feed epilimnion algae.
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discontinuity
discontinuity (dɪsˌkɒntɪˈnjuːɪtɪ) [f. med.L. type *discontinuitās, f. discontinu-us: see next and -ity. Cf. F. discontinuité (1775 in Hatz.-Darm.).] 1. a. The quality or state of being discontinuous; want or failure of continuity or uninterrupted sequence; interrupted condition.1570 Dee Math. Pref. ...
Oxford English Dictionary
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Deep chlorophyll maximum
Lakes
Lake Superior
The DCM of clear, stratified water is commonly found below the epilimnion. Although the epilimnion and DCM are neighbouring layers of water, the species composition of the epilimnion and the DCM differ almost entirely.
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طبقة مائية عليا
طبقة مائية عليا
تسمى الطبقة المائية العليا في البحيرات الطبقة الدافئة جيدة التهوية (بالإنجليزي: Epilimnion)
في حين تسمى الطبقة السفلية الطبقة المائية
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Lake stratification
Typically stratified lakes show three distinct layers: the epilimnion, comprising the top warm layer; the thermocline (or metalimnion), the middle layer Cold water is denser than warm water and the epilimnion generally consists of water that is not as dense as the water in the hypolimnion.
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Lake Matano
Beneath the epilimnion, density is generally constant year-round. in the epilimnion.
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