General Studies- I: Geography [15 Marks 250 Words ]
Answer Structure:
- Introduction: Heating and cooling of oceans
- Body: The factors which affect the distribution of temperature of ocean water
- Conclusion: Temperature in open seas and closed seas
Answer
Introduction
Ocean waters get heated up by the solar energy just as land. The process of heating and cooling of the oceanic water is slower than land.
Body
The factors which affect the distribution of temperature of ocean water are : (i) Latitude : the temperature of surface water decreases from the equator towards the poles because the amount of insolation decreases poleward. (ii) Unequal distribution of land and water : the oceans in the northern hemisphere receive more heat due to their contact with larger extent of land than the oceans in the southern hemisphere. (iii) Prevailing wind : the winds blowing from the land towards the oceans drive warm surface water away form the coast resulting in the upwelling of cold water from below. It results into the longitudinal variation in the temperature. Contrary to this, the onshore winds pile up warm water near the coast and this raises the temperature. (iv) Ocean currents : warm ocean currents raise the temperature in cold areas while the cold currents decrease the temperature in warm ocean areas. Gulf stream (warm current) raises the temperature near the eastern coast of North America and the West Coast of Europe while the Labrador current (cold current) lowers the temperature near the north-east coast of North America.
Conclusion
All these factors influence the temperature of the ocean currents locally. The enclosed seas in the low latitudes record relatively higher temperature than the open seas; whereas the enclosed seas in the high latitudes have lower temperature than the open seas.
(The model answer provided by us strictly follows the word limit, the above answer is compiled in 250 words.)
Practicing answers sticking to the word limit will aid the aspirants to write answers precisely and to the point avoiding unnecessary things.
(Titles : Introduction, Body and Conclusion are just for reference, aspirants should not write these titles in the answer sheet.)