Sea Level - • 3 reasons • 1 Change in geometry of...

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Sea Level 17/03/2008 21:22:00 Sea level rise from melting glaciers during last major glaciation = 120m When did the ice start to melt most quickly? At 13,000 years ago  (steepest slope Sea level changes: why do we care? History: o People live near ocean o If we had a 10m rise in sea level…floods 25% of US population, and  11 of the world’s 15 largest cities along coast/estuary Sea level changes: past, present, future Questions: o 1. How has sea level changed in the past? o 2. Is it changing right now? o 3. How could it change in the future Absolute Sea level change: Sea level goes up or down relative to a datum o Datum provides a fized point, against which you can measure change Center of the earth GOOD Some point on coast BAD Why would absolute sea level change?
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Unformatted text preview: • 3 reasons: • 1. Change in geometry of continents and ocean basins o plate tectonics, happens over millions of years • 2. Change in volume of water in different reservoirs o Water moves from cryosphere (ice and snow) to oceans, sea level ----? Also when dams, groundwater, etc. is moved from land to ocean • Change in temperature of water in ocean (biggest factor). Warmer water is less dense (density is kg/m^3)… or mass per volume (density question on test) o As the density goes up, the volume decreases o As density goes down, volume increases o Thus with warmer water, the volume increases and the sea level increases 17/03/2008 21:22:00 ← 17/03/2008 21:22:00 ←...
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