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Write about classification of ocean currrents |
| Answer» <html><body><p>tion:Ocean currents are patterns of water movement and patterns that influence climate zones and weather patterns around the world.There are two types of currents, surface currents and deep water currents, that dictate how and where water will move.Surface currents refer to movement of the top layer of ocean water – the upper 330 feet or so – primarily driven by wind. The large-scale <a href="https://interviewquestions.tuteehub.com/tag/circulation-16314" style="font-weight:bold;" target="_blank" title="Click to know more about CIRCULATION">CIRCULATION</a> of these surface currents roughly mirrors the large-scale circulation of air, which most simply derives from unequal heating of the planet’s surface by the sun. Currents form rotating systems in the middle of major ocean systems called gyres. Like the winds controlling them, these surface currents help redistribute <a href="https://interviewquestions.tuteehub.com/tag/heat-21102" style="font-weight:bold;" target="_blank" title="Click to know more about HEAT">HEAT</a> at a planetary scale: Generally speaking warm water flows toward the poles and cold water flows toward the equator.Deep-water currents describe water movement patterns far below the ocean’s surface and the influence of the wind. Instead of airflow, these currents primarily arise from <a href="https://interviewquestions.tuteehub.com/tag/variations-1443264" style="font-weight:bold;" target="_blank" title="Click to know more about VARIATIONS">VARIATIONS</a> in the density of seawater, <a href="https://interviewquestions.tuteehub.com/tag/controlled-7257577" style="font-weight:bold;" target="_blank" title="Click to know more about CONTROLLED">CONTROLLED</a> by its temperature and salt content (salinity). Their movement forms thermohaline circulation (“thermo” meaning temperature, “haline” meaning salinity) which crosses ocean basins and links to surface currents in what’s called the “global conveyor belt.”In very simplified form, water moving into the polar regions gets cold enough to freeze into ice, leaving its share of salt behind; this makes the underlying water saltier, which in turn makes it denser. This cold, dense, saltier water sinks to the seafloor, replaced by surface waters that repeat the process. The deep current moves toward the equator and warms up, becoming less dense and rising to the surface in “upwellings.”</p></body></html> | |