EAS212 Lecture 4: notes_lecture04

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Temperature: the earth effectively receives its energy from the sun, winds currents and waves, incoming solar radiation is not evenly divided over the earth, variations caused by, daytime x nighttime, seasons, latitude. Salinity: at the simplest level, salinity is the total amount of solid material dissolved in sea water, originally expressed as and sometimes given in parts per thousand or psu (practical salinity. Units: but it is dimensionless (no units, ocean seawater has ~35 grams of salt for each kilogram of water, variability of dissolved salts is small needs to be determined. 35 = 35 psu = 35 g/kg accurately. Grams salt initially = salinity * kg water 20,000 kg * 25 g/kg = Adding 100 kg 500,000 g + 100,000 g = 600,000 g. New salinity = grams salt/kg water 600,000/20,000 = 30 g/kg = 30 psu. Processes affecting seawater salinity: precipitation, evaporation, runoff, ice melting, sea ice forming.

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