GEOS 212 1st Edition Lecture 17 Outline of Last Lecture LECTURE 16 OUTLINE Density currents Review of longshore currents transport Review of coastline processes from wave action erosion longshore transport deposition Shoreline Straightening Upwelling downwelling from onshore offshore wind Upwelling downwelling waves longshore transport water temp and fishing on an island Global patterns of upwelling downwelling and marine productivity map info Density currents 1 up at the equator from sun heat down at high latitudes turns in 100 years 2 Seasonal up in summer hemisphere down in winter hemisphere o Driven largely by formation of ice sheets o Produces upwelling big affect on life and migration patterns o Very slow 100 year rate but never turns in complete circle 3 Conveyor Belt current important for mixing of oceans turns in 1000 years Mixing time of the oceans main processes Outline of Current Lecture LECTURE 17 OUTLINE El Nino La Nina Hurricanes Review of dynamic aspects of oceans keep oceans well mixed o Waves surface layer Surface currents surface layer These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Longshore currents surf zone o Coastal upwelling downwelling deep shallow water on local scale o Density currents driven by temperature and salinity 1 up at the equator from sun heat down at high latitudes turns in 100 years 2 Seasonal up in summer hemisphere down in winter hemisphere Driven largely by formation of ice sheets in winter Produces upwelling in opposite hemisphere controls migration patterns Slow 100 year rate and never turns in complete circle 3 Conveyor Belt current mixes all oceans turns in 1000 years Mixing time of the oceans 1600 years Impact of mixing time on marine life and society El Nino o patterns causes and consequences o history back thru time o connection to global warming Pattern of hurricanes in profile and map view where up down Conditions needed for hurricanes warm water warm unstable air upper level winds not on equator Hurricanes typhoons and cyclones same storm in different oceans Hazards storm surge to 30 feet heavy rains over 1 per hour strong winds 74 to 200 mph Hurricane tracks Relation to global warming Current Lecture
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