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Lecture 5

OCEAN 320 Lecture 5: Unit 5C
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Department
Oceanography
Course Code
OCEAN 320
Professor
K.Robinson

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Unit 5C
Jet Stream (Video)
Warmer air takes up more vertical space than colder air; creates a hill that air want to
move “downhill” towards the cold
oCreates the jet stream
As we warm the polar areas more and more, the hill becomes less steep, causing a
weakened jet stream
oAs high latitudes warm faster than the middle latitudes
oWind speeds moving northerly drop by 10%
oDrop off most dramatically when sea ice melts
Rossby theory: says weaker westerly flows more meanderingly; moves slow and less
precisely
Waves are getting stretched as they have to compensate to maintain temperatures; go
higher north and lower south
Low amplitude wave=fast moving storm
Weather in a Tank
Tank on table that rotates at speed according to what phenomena trying to observe
oWorks to combine both theory and observation to verify understanding of natural
phenomena
Trying to account for weather system and eddy involvement
oUses one tank not rotating and the rotating tank to illustrate the involvement of
eddies and weather
oDisturbing still water with hand and include dye to show how water behaves with
atmospheric interference; dye disperses throughout tank
oDisturb rotating water and include dye; dye does not disperse, simply sinks from
surface and creates “curtains”’ swirls and streak differently (red spot swirl like
Jupiter’s storm!)
Tank with can of ice in middle to represent pole (surrounding water is warmer to
represent equator)
oDye sinks faster near ice, then moves outward and pulls warmer water in toward
the ice
NASA: A Year in the Life of Earth’s CO2
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Description
Unit 5C Jet Stream (Video) Warmer air takes up more vertical space than colder air; creates a hill that air want to move downhill towards the cold o Creates the jet stream As we warm the polar areas more and more, the hill becomes less steep, causing a weakened jet stream o As high latitudes warm faster than the middle latitudes o Wind speeds moving northerly drop by 10% o Drop off most dramatically when sea ice melts Rossby theory: says weaker westerly flows more meanderingly; moves slow and less precisely Waves are getting stretched as they have to compensate to maintain temperatures; go higher north and lower south Low amplitude wave=fast moving storm Weather in a Tank Tank on table that rotates at speed according to what phenomena trying to observe o Works to combine both theory and observation to verify understanding of natural phenomena Trying to account for weather system and eddy involvement o Uses one tank not rotating and the rotating tank to illustrate the involvement of eddies and weather o Disturbing still water with hand and include dye to show how water behaves with atmospheric interference; dye disperses throughout tank o Disturb rotating water and include dye; dye does not disperse, simply sinks from surface and creates curtains swirls and streak differently (red spot swirl like Jupiters storm!) Tank with can of ice in middle to represent pole (surrounding water is warmer to represent equator) o Dye sinks faster near ice, then moves outward and pulls warmer water in toward the ice NASA: A Year in the Life of Earths CO2
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