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Upwelling and Density Currents: Global Patterns and Impacts on Marine Productivity, Study notes of Oceanography

University of Arizona (UA)Oceanography

This lecture outline from october 16, 2008, discusses global patterns of upwelling and downwelling, their relationship with marine productivity, and the role of wind and density currents in shaping ocean circulation. Topics include equatorial upwelling, cold tongue and warm pool formation, wind-driven upwelling in the southern ocean, and thermohaline circulation. The lecture also explores the impact of ocean mixing on marine life and society.

Typology: Study notes

Pre 2010

Uploaded on 08/31/2009

koofers-user-e12
koofers-user-e12 🇺🇸

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LECTURE 15 OUTLINE (Upwelling and Density currents – October 16, 2008)
Global patterns of upwelling/downwelling and marine productivity (map info!!)
Upwelling = Nutrients = High Productivity
Wind causes upwelling along equator and along some coastlines
Equatorial Upwelling
Cold Tongue / Warm Pool
Wind-driven upwelling in Southern Ocean (important for mixing of oceans 200-300 yrs)
Density currents: Thermohaline Circulation
Warm water floats/Cold water sinks/Fresh water floats/Salty water sinks
#1: up at the equator from wind/heat, down at high latitudes, turns in 100 years!
#2: Seasonal (down in winter hemisphere)
Driven partly by cooling and evaporation, partly by formation of ice sheets
#3 = Conveyor Belt current in Atlantic Ocean
Mixing time of the deep oceans -- main processes
Impact of mixing time on marine life and society
Tank Experiment
Chlorophyll concentration
Lo Hi
Oceans
Land
pf3

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LECTURE 15 OUTLINE (Upwelling and Density currents – October 16, 2008) Global patterns of upwelling/downwelling and marine productivity (map info!!) Upwelling = Nutrients = High Productivity Wind causes upwelling along equator and along some coastlines Equatorial Upwelling Cold Tongue / Warm Pool Wind-driven upwelling in Southern Ocean (important for mixing of oceans 200-300 yrs) Density currents: Thermohaline Circulation Warm water floats/Cold water sinks/Fresh water floats/Salty water sinks #1: up at the equator from wind/heat, down at high latitudes, turns in 100 years! #2: Seasonal (down in winter hemisphere) Driven partly by cooling and evaporation, partly by formation of ice sheets #3 = Conveyor Belt current in Atlantic Ocean Mixing time of the deep oceans -- main processes Impact of mixing time on marine life and society Tank Experiment Chlorophyll concentration Lo Hi Oceans Land