Ocean current
Currents are where the water moves like rivers in the ocean they are bitchen because they move and defy physics and make little kids drown. Currents also make ocean animals migrate because they are fags, water fags, or as some say, water panzies, water bitches, and my personal favorite, water pusseys.
Important currents
Ocean currents can flow for thousands of kilometers. They are very important in determining the climates of the continents, especially those regions bordering on the ocean. Perhaps the most striking example is the Gulf Stream, which makes northwest Europe much more temperate than any other region at the same latitude. Another example is the Hawaiian Islands, where the climate is cooler (sub-tropical) than the tropical latitudes in which they are located because of the California Current.
Background
Surface ocean currents are generally wind driven and develop their typical clockwise spirals in the northern hemisphere and counter-clockwise rotation in the southern hemisphere because of the imposed wind stresses. In wind driven currents, the Ekman spiral effect results in the currents flowing at an angle to the driving winds. The areas of surface ocean currents move somewhat with the seasons; this is most notable in equatorial currents.
Deep ocean currents are driven by density and temperature gradients. Thermohaline circulation, also known as the ocean's conveyor belt, refers to the deep ocean density-driven ocean basin currents. These currents, which flow under the surface of the ocean and are thus hidden from immediate detection, are called submarine rivers. These are currently being researched by a fleet of underwater robots called Argo. Upwelling and downwelling areas in the oceans are areas where significant vertical movement of ocean water is observed.
Surface currents make up about 10% of all the water in the ocean. Surface currents are generally restricted to the upper 400 meters of the ocean. The movement of deep water in the ocean basins is by density driven forces and gravity. The density difference is a function of different temperatures and salinity. Deep waters sink into the deep ocean basins at high latitudes where the temperatures are cold enough to cause the density to increase. The main causes of currents are: solar heating, winds and gravity.
Ocean currents are measured in Sverdrup with the symbol Sv, where 1 Sv is equivalent to a volume flow rate of 106 cubic meters per second.
Significance to people and sea life
Knowledge of surface ocean currents is essential in reducing costs of shipping, since they reduce fuel costs. In the sail-ship era knowledge was even more essential. A good example of this is the Agulhas current, which long prevented Portuguese sailors from reaching India. Even today, the round-the-world sailing competitors employ surface currents to their benefit.
Ocean currents are also very important in the dispersal of many life forms. A dramatic example is the life-cycle of the eel.
Important currents
Column-generating template families
The templates listed here are not interchangeable. For example, using {{col-float}} with {{col-end}} instead of {{col-float-end}} would leave a <div>...</div> open, potentially harming any subsequent formatting.
| Type | Family | Handles wiki
table code?† |
Responsive/ Mobile suited |
Start template | Column divider | End template |
|---|---|---|---|---|---|---|
| Float | "col-float" | Yes | Yes | {{col-float}} | {{col-float-break}} | {{col-float-end}} |
| "columns-start" | Yes | Yes | {{columns-start}} | {{column}} | {{columns-end}} | |
| Columns | "div col" | Yes | Yes | {{div col}} | – | {{div col end}} |
| "columns-list" | No | Yes | {{columns-list}} (wraps div col) | – | – | |
| Flexbox | "flex columns" | No | Yes | {{flex columns}} | – | – |
| Table | "col" | Yes | No | {{col-begin}}, {{col-begin-fixed}} or {{col-begin-small}} |
{{col-break}} or {{col-2}} .. {{col-5}} |
{{col-end}} |
† Can template handle the basic wiki markup {| | || |- |} used to create tables? If not, special templates that produce these elements (such as {{(!}}, {{!}}, {{!!}}, {{!-}}, {{!)}})—or HTML tags (<table>...</table>, <tr>...</tr>, etc.)—need to be used instead.
See also
- Gyre
- Hydrothermal circulation
- Thermohaline circulation
- Marine current power
- Water mass
- Rogue wave (oceanography)
External links
- NOAA Ocean Surface Current Analyses - Realtime (OSCAR) Near-realtime Pacific Ocean Surface Currents derived from satellite altimeter and scatterometer data.
- RSMAS Ocean Surface Currents
- Coastal Ocean Current Monitoring Program
- Ocean Motion and Surface Currents
- Data Visualizer from OceanMotion.org