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Oceanography
Chapters 6 - 10
Question | Answer |
---|---|
The Coriolis Effect | a phenomena that causes fluids, like water and air, to curve as they travel across the earths surface |
The Coriolis Effect: Wind moves from *pressure* to *pressure*? | High to Low |
Coriolis: In the southern hemisphere (toward the equator) the wind moves to which direction? | Left |
Coriolis: In the northern hemisphere (toward the equator) the wind moves to which direction? | Right |
Onshore Breeze | The air over the water moves inland to replace it |
Offshore Breeze | The air rises over the water, and the air from the land replaces it |
Thermocline | Transition layer between the top (mix) layer, and denser deep sea (0-1000m) deep. Temperatures decrease rapidly with depth |
Halocline | the change in salinity with depth |
The density of the water increases with depth, the water column from the surface to that depth is_____________ | Stable |
There is higher density water on top of lower-density water, the water column is__________ | Unstable |
Thermohaline circulation | When water is moved from one location to another it is called continuity of flow. This motion, caused by variations in density due to differences in temperature and salinity. |
Areas of thermohaline circulation where water sinks are called_________ | Downwelling zones. Downwelling is a mechanism that transports oxygen-rich surface water to the depths where it is needed for deep-living animals. |
Areas of rising waters are called_____ | Upwelling zones. Upwelling returns low oxygen-content water with dissolved, decay-droduced nutrients to the surface where the nutrients act as fertilizers to promote photosynthesis and the production of more oxygen in the sunlit surface waters. |
Pycnocline | The area of rapid change in density with depth between the mixed layer and deep layer |
If the water column has the same density over depth, it has neutral stability termed ___________ | Isopycnal |
If water salinity is constant over depth it is termed __________ | Isohaline |
Wind-driven surface water sets the water immediately below it in motion, because of low-friction coupling in the water, this next deeper later moves more slowly than the surface layer and is deflected to the right or left, for each layer going down | Ekman Spiral |
The surface layer of water corresponding to the Ekman spiral | Ekman Layer |
The Ekman spiral extends the depth of approximately________ | 100-150m (330-500ft) |
Large circular motion, wind-driven current systems | Gyres |
The 5 major ocean gyres | Indian, North Pacific, South Pacific, North Atlantic, South Atlantic |
California Current | Water that accumulates on the west coast due to westerly currents, flows from north to south along the western coast of North America |
Kuroshio Current | Water that accumulates on the east coast of japan due to the North Pacific Current, water flows from south to north. |
North-south continuity current flowing northward along the coast of North America | Gulf Stream |
Current moving to the south along the eastern side of the North Atlantic | Canary Current |
Capillary Waves | Wrinkles/ripples |
Wave Speed Formual | Length of Wave/Wave Period (C=L/T) |
Deep water waves | D > L/2 |
Shallow water waves | D < L/20 |
When faster longer waves gradually move through and ahead of slower waves | Dispersion |
To calculate the speed of a shallow water wave | C = 3.13*sqrt(D) |
Three types of tides | Sedmidiurnal tides (once daily) Diurnal tides (twice daily) Mixed semidiurnal tides (mix) |
Minus tide | When the low tide level falls below the mean value used as the tidal daytum |
Wave speed for large wave | C = 1.25 * sqrt(L) |