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Lecture 3

BIO205H5 Lecture Notes - Lecture 3: Thermocline, Sea Surface Temperature


Department
Biology
Course Code
BIO205H5
Professor
Christoph Richter
Lecture
3

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BIO205: Lecture #3 :What Influences Environmental Conditions 09/16/2014
!
Slide #9: The Earth is Heated Unequally By The Sun
!Less energy in North compared to the South.
!Higher latitudes have a decreasing temperature.
Slide #10: The Sun’s Heating Is Seasonal
!Different amount of sunlight for different periods in different times of the year.
Slide #11: The Unequal Heating Creates Air Currents
!Sun warms air; warm air rises
Slide #12-#13: The Unequal Heating, And Winds Create Ocean Currents
!Water from ocean bottom is much more nutritive because when organisms die they settle
at the bottom.
!Huge amounts of water circulates around the ocean scales.
!The trade winds create a pattern; west to east across the equator.
!At South America the water flow is east to west.
Slide #14: These Regular Models Are Disrupted Every Now and Then
!Peruvian coast sucks up warm water from the bottom of the ocean.
!Thermocline: area of the largest temperature change. [in diagram deep blue line]
!In an el nino year what changes is
o!The water that is suppose to flow to the Western Pacific piles up in South
America.
o!Thermocline is pushed to lower depths.
o!Instead of the water flowing up it pushes down.
Slide #15: El Nino Has Global Consequences
!North America has much warmer and wetter conditions.
!Fisheries were not as efficient.
Slide #16: And What Does It Look Like For The Future.
!SST = sea surface temperature
!If SST is larger than 0.5 then it will be called an El Nino year.
!Patterns are caused by sun rays, whirlwinds etc…
Slide #17: There Are Also More Localized Patterns
!One side of the mountains has drier conditions than the other.
!Clicker Question: Wjy does it rain on the coastal side of mountains?
o!Because air being forced upward cools down and cannot hold as much moisture.
Slide #18: These Maps Show Temperature Profiles and Density of Different Usage
!Red = industrial ; darker red more industrial area (Peaks encounter high temperatures)
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