12_coriolis_ekman - Surfacesalinity,Corioliseffect...

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Surface salinity, Coriolis effect  and Ekman transport GS222 Lecture 12
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Overview - this lecture Atmospheric circulation, evaporation, precipitation, and  salinity Coriolis effect  Ekman transport – wind acting on the ocean surface
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Hadley circulation Solar hearting greatest at equator, drives convection Air then cools, becomes more dense and sinks at  higher latitudes. Creates horizontal pressure gradient at surface low pressure at equator, high pressure at ~30 °N,  and ~30 °S winds blow from high to low pressure i.e. convergence at equator, divergence at ~30  °N, and ~30 °S 
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AABW AAIW NADW some of the rising air flows south some of the rising air flows north Rising air is now dry… Dry air descends at around 30º N …and at around  30º S Deserts Subtropical Gyres Deserts Subtropical Gyres The descending air flows N and S Hadley  Circulation H L H
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Evaporation, precipitation, salinity
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Surface salinity reflects E-P
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AABW AAIW NADW Surface salinity reflects E-P
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Latitudinal heat transport occurs via two primary mechanisms: 1)Atmospheric  - latent heat (vapor condensation) - sensible heat (warm air heats   cold air) 2)Oceanic      - sensible heat from warm ocean currents
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Global wind patterns 1) Hadley:   convergence and ascending air at the equator,  descending air and surface divergence at 30 degrees 2) Ferrel:   descending air from Hadley diverges at surface  and enters Ferrell cell
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This note was uploaded on 01/20/2012 for the course GEO 222 taught by Professor Davidlund during the Winter '11 term at University of Michigan.

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12_coriolis_ekman - Surfacesalinity,Corioliseffect...

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