limno 4 temp and thermal stratification – Flashcards
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thermal stratification
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vertical zonation of temp
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fetch
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distance over which wind blows over the water surface
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heat
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energy transferred from one body to another
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sensible heat flux
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heat that can be sensed by a change in temp
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latent heat flux
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heat that is transferred wout a change in temp as water changes its physical state
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Earths surface atmosphere
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evaporation transfers heat from.... to....
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atmosphere Earths surface
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condensation transfers heat from....to....
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Earths surface atmosphere
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freeing transfers heat from....to.....
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atmosphere Earths surface
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melting transfers heat from ....to....
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dimictic
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lake that mixes twice each year and stratifies twice each year, typical for temperate zone
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relative thermal resistance (bc of lowest density at about 4? deg)
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density differences at adjacent depth compared to density differences between 4 and 5 deg C
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bottom of mixed depth (mixing depth), depth of max temp change (planar thermocline), greatest density difference (seasonal thermocline)
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thermocline definitions (3)
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temporary thermocline
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may develop on hot, calm days, rapidly broken down by wind
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planar thermocline
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depth of max temp change
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seasonal thermocline
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depth where density difference is the greatest
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isopleth diagram
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lines of temp by depth and month
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deep
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stratification is more likely if the depth of the lake is....
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small
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stratification is more likely if the length/area of the lake is....
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planar thermocline (max temp change)
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use this thermocline for tropical lakes
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mixing depth
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thermocline where the epilimnion ends
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mixing depth (bottom of epilimnion)
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use this thermocline for Japanese lakes
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holomictic
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lake where the entire water column mixes
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meromictic
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lake where only the upper water column mixes, deeper layers often saline (higher density, resistant to mixing)
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dimcitic
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lake type we have in Ohio, also in high elevation tropical areas
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inverse stratification
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dimictic lakes in winter
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frozen kinda mixed? mixed inverse stratification
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cold monomictic lake in winter spring summer fall
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mixed stratified stratified stratified
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warm monomictic lake in winter spring summer fall
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mixing infrequent and unpredictable
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oligomictic lake in winter spring summer fall
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warm temperate lakes, southern US, Great Lakes sometimes bc large volume, deep tropical lakes (Acton some years warm monomictic other years cold monomictic)
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warm monomictic lakes examples
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many tropical lakes (hardly ever mix)
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ex of oligomictic lakes
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many small, shallow lakes
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ex of polymictic lakes
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frequent cycles of mixing and stratification
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polymictic lake in winter spring summer fall
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inverse stratification year round
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amictic lake in winter spring summer fall
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Antarctica lakes (never mix, permanently stratified, permanently ice covered)
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ex of amictic lakes
