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Even if this were the case, it does not explain why the gradual shift in phase is observed in thick metalimnions and is not in very homogeneous hypolimnions and epilimnions.
During summer, the metalimnion (thermocline) forms a barrier to wind-caused current.
Temperature profiles in the epilimnion, metalimnion, and hypolimnion are known to vary significantly (LaBounty & Burns 2005) (Figure 3).
The metalimnion had shifted deeper and a considerable increase in TP was recorded at a depth of 4-7 m.
In general, the metalimnion samples in June were more acid than adjacent layers.
The metalimnion extends from 2m-6m and an unusual metalimnetic oxygen minimum exists between 3.5-4.0m.
In the absence of Daphnia, phytoplankton abundance as measured by chlorophyll a was greatest in the metalimnion samples and very low in the epilimnion (Fig.
pulicaria resided in the metalimnion or hypolimnion, or both, during the day.
The water column was initially characterized by moderate stratification, with a temperature gradient of less than 1[degrees]C in the 1.0 m thick epilimnion and a moderately well defined metalimnion. During the day it progressively formed a stepped thermal structure, returning after 4:00 pm to moderate stratification.
The temperature below the metalimnion boundary was 9-10[degrees]C and in the deep layers of the hypolimnion 4-5[degrees]C.
Este fenomeno incide en el patron de estratificacion del lago, pues el metalimnion asciende hacia la superficie presentandose una zona de mezcla de poco espesor.
A second sample was taken from the metalimnion, defined as either the oxygen maximum (when present) or the depth of greatest temperature change.