kecture2-1_surfaceOceanCurrents_posted

kecture2-1_surfaceOceanCurrents_posted - deflected by thin...

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GEO 106 DSM Lecture 2-1 GEO 106 Earth Systems Science II Global Climate Change Lecture 2-1 – Surface ocean currents
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GEO 106 DSM Lecture 2-1 Important Concepts: Trade winds, Westerlies, and Easterlies cause major surface ocean current circulation Gyres form because of the Coriolis effect Ekman Currents are responsible for net convergence and divergence of top 100m or so of ocean water Convergence and divergence of water leads to zones of upwelling and downwelling water
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GEO 106 DSM Lecture 2-1
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GEO 106 DSM Lecture 2-1 Ocean Surface Currents top 100 meters moved… i) surface currents roughly… only top 100 meters… deep currents… ii) currents deflected another… creates gyres… deflection against land… iii) 50% of heat imbalance… warm currents move… cold currents move…
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GEO 106 DSM Lecture 2-1 Ocean Surface Currents (cont.) b) convergence of water i) wind piles water…? Ekman transport… ii) Ekman spiral: thin surface layer…
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Unformatted text preview: deflected by thin underlying layer deflected again creates spiral speed decreases with GEO 106 DSM Lecture 2-1 Ocean Surface Currents (cont.) iii) net effects: surface currents 90 o angle water piles in center http://www.oscar.noaa.gov/datadisplay/ GEO 106 DSM Lecture 2-1 Ocean Surface Currents (cont.) c) divergence of waters wind parallel to Ekman spiral deflects Ekman transport moves = divergence from GEO 106 DSM Lecture 2-1 Ocean Surface Currents (cont.) d) upwelling and downwelling connect surface and i) downwelling: convergence center 50 cm. = sinking ii) upwelling: divergence bottom water replaces = rising nutrient rich GEO 106 DSM Lecture 2-1 Sargasso Sea from Portuguese word sargassum Thin veneer of Dubbed an ocean desert Columbus thought calm winds drifted for days...
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