EAS212 Lecture Notes - Lecture 5: Radiometry, Sea Spray, Strontium
20 Jan 2018
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Document Summary
Eas lec 5: temperature and salinity: kelvin, commonly measure using: Biogeochemical cycles: seawater = many different chemical compounds, chemical compounds = weathering and corrosion transported to ocean, ex: dust from sahara running into amazon and oceans. Hydrothermal activity at mid-ocean ridge: concentration of each element in water . Long residence time = more time is needed to mix and move the substance is in more places in the ocean. Salinity: total amount of dissolved material in grams/1 kg of seawater dimensionless (mass/mass) No units: does not vary much must be accurately determined, sometimes given in part per thousand % 35% grams of salt/kg of water, psu practical salinity units 35% = 35 psu. Dissolved chemicals: chemicals in seawater = elements, radionuclides (natural and man-made), organic compounds, compound ions (ex: po4, etc, major, minor, trace, measured in ppm (mg/kg) 1 tsp/5000l, measured in ppb (ug/kg) 1 tsp/5 000 000l.
