g104_class7_density

g104_class7_density - Geography 104 -...

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Density - density is a key property of seawater - one of the most important parameters in ocean dynamics - the ocean forms layers by density (denser waters deeper) - density must increase with depth for gravitational stability - density changes in the vertical inhibit mixing - density changes in the horizontal drive currents - mixing is mostly along isopycnals (lines of constant density) Geography 104 - “Physical Geography of the World’s Oceans”
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density is defined as the mass of a substance divided by its volume seawater density - mass of seawater per volume of seawater density represented as ρ (Greek letter small “rho”) density units - expressed as kg m -3 or g cm -3 (1 g cm -3 =1000 kg m -3 )
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two factors regulate the density of freshwater ( ρ (T,p)) 1) temperature – increase in T => decrease in ρ (T > 4 °C) 2) pressure – increase in p => increase in ρ
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freshwater density vs. temperature constant pressure = 1 atm in a freshwater lake, cooler water (that is very cold) can be less dense than warmer water
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This note was uploaded on 01/06/2010 for the course GEOG 104 taught by Professor Staff during the Fall '08 term at UCSB.

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g104_class7_density - Geography 104 -...

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