| 释义 |
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], of or within the metalimnion.
1935P. S. Welch Limnol. ii. iv. 54 The term thermocline was first used by Birge in 1897... Since then, the terms transition zone, mesolimnion, and metalimnion have been proposed. 1957G. E. Hutchinson Treat. Limnol. I. vii. 428 It is convenient to define the widely used term metalimnion to designate the whole of the region in which the temperature gradient is steep. Ibid. 464 In general, the smaller lakes..showed very striking metalimnia at depths of between 3 and 10 m. 1957Metalimnetic [see epilimnion]. 1960Limnology & Oceanogr. V. 216 (heading) The cause of a metalimnetic minimum of dissolved oxygen. 1974Nature 8 Feb. 393/2 During the summer, in the metalimnion of Lake Kinneret, the photosynthetic, green sulphur bacterium, Chlorobium phaeobacteroides can reach concentrations as high as 107 cells ml-1. |