What are the forces that influence ocean currents? Describe their role in fishing industry of the world.
Ocean currents, the continuous, directed movement of seawater, are vital arteries of our planet, driven by a combination of primary and secondary forces.
The primary forces are those that initiate the movement of water. These include solar heating, which causes water to expand and creates gradients; winds, which drag the surface water through friction; gravity, which pulls denser, colder water downwards; and the Coriolis effect, a result of the Earth's rotation that deflects moving water to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
Secondary forces, like temperature and salinity differences (thermohaline circulation), influence the vertical and deep-water movements, shaping the global "conveyor belt" of circulation. The shape of ocean basins and coastlines also steer and modify these currents.
The role of ocean currents in the global fishing industry is immense. The world's richest fishing grounds are found where currents cause upwelling—a process where cold, nutrient-rich water from the deep ocean rises to the surface. This influx of nutrients, like nitrates and phosphates, fuels explosive growth of phytoplankton, the base of the marine food web. This, in turn, supports vast populations of fish.
Famous examples include the coast of Peru, where the cold Humboldt Current causes significant upwelling, creating a massive anchovy fishery. Similarly, the Grand Banks off Newfoundland is another major fishing ground, located where the cold Labrador Current meets the warm Gulf Stream, creating ideal conditions for fish to thrive.
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Important Questions from GS1
How far is it correct to say that the First World War was fought essentially for the preservation of the balance of power?
How far was the Industrial Revolution in England responsible for the decline of handicrafts and cottage industries in India?
The groundwater potential of the Gangetic valley is on a serious decline. How may it affect the food security of India?
What are aurora australis and aurora borealis? How are these triggered?
What is a twister? Why are the majority of twisters observed in areas around the Gulf of Mexico?
