phys 0 physical properties

Phys 0 physical - Temperature Range o o 30C to-2C Average is 3C Why 70 of the ocean is between 0C and-4C Horizontal Distribution o o o Warmer

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Temperature Range o 30°C to -2°C o Average is 3°C Why? 70% of the ocean is between 0°C and -4°C Horizontal Distribution o Warmer closer to equator o Temps follow sun's heating N. Hemisphere warmer in September S.  Hemisphere warmer in March o Small fluctuations influenced by currents (Gulf Stream) Vertical Distribution o Temp. decreased with increasing depth o 3 zones are created o Mixed layer : down to 100m; mixed by wind; isothermal o Thermocline : from 100 to 1500m; area of rapid temp. change (up to 20°C) o Deep zone : below 1500m; very cold; isothermal o Changes occur over the year but mostly in mixed layer Temperature Types o In-situ  (T): actual observed temperature o Potential  ( θ ): the temp. a water parcel would have at the surface if it were raised to the  surface  adiabatically  (no heat exchange) First Law of Thermodynamics ΔE=ΔHeat + ΔWork For adiabatic processes: ΔE=Δwork If we bring a water parcel down (sinks), work is done on the parcel by  pressure Work increases, so E increases…temperature must also increase θ   is ALWAYS less then T Why do we need this?
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Water masses take on their characteristic temp. and salinity at the  surface Since temperature changes (because of pressure), we can use  θ  to track  water masses Pressure sucks!!. ..it messes up our data    Salinity Units o Salinity  is the amount of dissolved material in sea water o Can have many units: psu, ppt or 0/00=g/kg sea water o If salinity is 35psu, what percentage is dissolved material? 3.5% is dissolved material
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This note was uploaded on 04/13/2008 for the course MSCI 304 taught by Professor Gilman during the Spring '08 term at Coastal Carolina University.

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Phys 0 physical - Temperature Range o o 30C to-2C Average is 3C Why 70 of the ocean is between 0C and-4C Horizontal Distribution o o o Warmer

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