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Thermohaline Circulation Carisa Sousa
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Description Defining - terminology –Meridional Overturning Movement –“Overturning” - Pacific and Indian Oceans –Vertical Mixing vs Sinking? –Spreading via currents? Water Masses –T-S plots, water properties
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Downwelling Specific zones in the North Atlantic and Southern Oceans Evaporative Cooling –Increase in Salinity Increase in Density –(Nor Sea, S.O.) Sea Ice formation –“Ice Factories” Topography – steers flow, blocks flow Pacific deep water formation? –Salinity
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North Atlantic DSOW Denmark Strait Overflow Water; LSW, Labrador Sea Water; NEADW, Northeast Atlantic Deep Water; NADW, North Atlantic Deep Water; EGC, East Greenland Current; LC, Labrador Current; WBUC, Western Boundary Undercurrent (Hillaire-Marcel, 2001.)
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Upwelling Vertical Mixing –Diffusion? –Advection? North Pacific and Indian Oceans –Sea level higher Southern Ocean Ekman divergence
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Importance Heat Transport –Gulf Stream Example Climate Regulator CO2 cycle climate cycle
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Climate Change Shutdown of THC –North Atlantic cooling –Unlikely Glacier Melt Freshening Other factors: wind? Even if weakening occurs, Warming>Cooling?
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