Stratification II
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Not all lakes stratify equally (even in the same climate). What are two main reasons for this?
• Lake color (transparency): changes light penetration depth (clearer lakes= deeper epilimnions) • lake size
Deeper lake are ___(more/less) likely to stratify Larger lakes “ “
deeper= more likely (b/c allows denser water to sink to depth) larger= less likely to stratify and will have deeper thermoclines
Most absorbed solar radiation converts into ___ in surface waters, which is then mixed down by ____
heat turbulence
Warming of the lake surface is pronounced in brownish lakes, resulting in more ____ and ___ thermoclines
shallow and stable
Thermoclines tend to be relatively ___ and ___ in clear lakes
deep and weak
___ is a key determinant of the magnitude of surface waves and ability of wind action to mix to depth
fetch
larger lakes have longer fetch distances, causing the thermocline to be _________(deeper/ shallower)
deeper
t/f wind exposure can lead to an early onset of ice cover
false later onset because of mixing
smaller, irregularly-shaped lakes stratify quickly in the spring, so a _____(greater/weaker) temp gradient develops within the metalimnion
greater
T/F Fetch affects the stability of the metalimnion
true more fetch= more poorly defined metalimnion
The degree of mixis within a lake depends on: 1 2
climate (latitude) and lake depth
T/F The compensation depth does not necessarily happen in the metalimnion
true