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Geosci 105 - -gas and water exchange between ocean and...

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- -heights are feet about mean low water -Tidal Currents -water rushing into or out of bays and harbors with dial change in sea level -flood current- the water coming up during the day -ebb current the river water flow goes back into the water -slack water- the period when the tide changes from rising to falling -Tidal bore: where the tide is constricted to the speed of the water creates a tide of a single wave train, one massive set of waves -Tidal Friction -tidal water motion causes friction, generating heat -water drags on sea bottom -dissipates energy of earth’s rotation: tide are slowing the earth down! -day gets longer by 2.3 milliseconds per century -ATMOSPHERIC CIRCULATION (chap 7) -The atmosphere and ocean are intimately linked in their motions driven by: -the uneven distribution of heat -modified by the coriolis effect on all movement as the earth rotates on its axis -need to understand atmospheric flow to understand ocean currents -Atmosphere: -composition of dry air: -78% nitrogen, 1% argon, 21 % oxygen, .o33% co2
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Unformatted text preview: -gas and water exchange between ocean and atmosphere-Air-can hold water vapor: up to ~4% by volume-Density varies:-density decreases with altitude-warm air is less dense than cold air (think of a hot air balloon)-humid air is less dense than dry air-warm air can hold more water vapor than cold air-gas temperature and pressure:-air cools when it expands, warms when it is compressed-rising warm air tends to form droplets as it expands and cools-Air mass and pressure-air column from sea level to top of atmosphere weighs about 1 kg (2.3 pounds) per cm^2-mass produces pressure: 14.7 pounds per square inch at sea level (1 bar or 1000 millibars)-expands and cools when pressure is reduced-contracts and warms when pressure is increased-Heat budget-over very long term, whole earth is in thermal equilibrium: heat in= heat out-Solar heating of earth varies with attitude-equal amounts of sunlight spread over more surface area near the poles than in the tropics...
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Geosci 105 - -gas and water exchange between ocean and...

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