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04 - Variability of temp and salinity in world's...

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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. -Pure water is 1g/cubic cent.
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