BIOL 335 Lecture Notes - Lecture 2: Monomictic Lake, Hypolimnion, Surface Tension

51 views6 pages
25 Aug 2016
Department
Course
Professor
BIOL 335
Week 2
Fate of Heat in Lakes:
Water:
Universal solvent
Unique density-temperature relationship
High specific heat
High surface tension
Max density reached at 3.98°C (~4.0°C)
Solid form (Ice) is less dense then liquid form
High viscosity-density
oAs temperature increases, viscosity decreases
oAs temperature decreases, viscosity increases
oTemperature and viscosity has an inverse relationship
Surface tension of Water
As temperature increases, Surface tension decreases
As temperature decreases , Surface tension increases
Temperature and surface tension has an inverse relationship
oNeuston:
Organisms that live on the surface of water because of surface tension
oHyponeuston:
Organisms that live under the surface of water
Temperature effects water tension
Different temperatures results in different water tension levels
Thermal stratification:
Seasonal patterns in typical temperate lakes
Isothermal: When the whole water column is near 4°C
Lakes stratifies into 3 thermal zones
1) Epilimnion: Consists of the shallow and warmer region of lakes
2) Metalimnion (Thermocline): “Middle” region where the max temperature change occurs
a. Rapid decrease in temperature with depth
3) Hypolimnion: Deeper, denser, cooler region
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows pages 1-2 of the document.
Unlock all 6 pages and 3 million more documents.

Already have an account? Log in
Seasonal changes:
1) Fall turnover
a. Surface water cools
b. Density increases and water sinks
c. Temperature approaches ~4°C
2) Winter stratification
a. Inverse stratification
b. Cooler water on top of warmer water
3) Spring turnover
a. Surface water heats up
b. Ice melts
c. Temperature reaching
~4°C
d. Water mixes
e. Cooler water is denser, goes
towards Hypolimnion
f. Warmer water is less
dense, goes towards surface
4) Summer stratification
a. Mixing of water layers begins
b. Water heats up
c. Work required to mix
c.i. Wind provides energy for work
d. The bigger difference in density or temperature results in greater work required
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows pages 1-2 of the document.
Unlock all 6 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+
$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class