10/04/10 Variability of temp and salinity in world's oceans.-Temp and salt control density of seawater.-Low latitudes have warmest water; trade winds from east push warm pools over.-Traces of cold water show that there is circulation-Most saline water 1/2 way between Africa and N and S. America, in centers of N and S Atlantic.-Middle of ocean basin has saltiest water.-N. pole has 3%, Atlantic has 3.7%-Water is evaporated from Atlantic and comes down over Central America land strip to come down as rain in the pacific, more concentrated in Atlantic, less in Pacific.-Poles have melting ice to dilute water.-Water tends to just sit in center of circulating gyres.-Surface ocean (1st 500m) is mixed; temp is same regardless of depth. Thermocline (500m-1250m) rapid water change to colder.-Deep ocean constant cold.-Polar has no mixed layer, no thermocline, all cold.-Temperate- distinct levels. Tropical-slow curve from mixed thru thermocline to deep.-Density increases as water temp decreases and/or salinity increases.
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This note was uploaded on 10/25/2010 for the course GEOL 107Lxg at USC.