MA

Medha AnandAIR 13

Question 4How does; what factors contributeGS1GS1

How does oceanic salinity vary across different regions of the world's oceans, and what factors contribute to these variations?

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Introduction

Oceanic salinity is the amount of dissolved salts in Ocean which direct its temperature and movement in ocean.

18 words

Main Body

Variations across oceans:

Salinity enhances in enclosed ocean bodies like Red Sea, Dead Sea, due to more evaporation and less influx of freshwater.

Also, variations occur along sea-line and based on phenomenon like El Niño etc

Also, wind flow and insulation affect salinity

En- Indian ocean has lesser salinity (~30ppm) due to influx of freshwater

Factors contributing to these variations:

1Evaporation - Insulation enhances evaporation, thus uby increasing salinity
2Influx of freshwater - reduces salinity
3Undercurrent - upwelling can bring dissolved salts onto surface
4Local factors - industrial effluents etc may lead to sporadic changes
5Enclosure by land - often leads to high salinity
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Conclusion

Thus, myriad factors affect oceanic salinity and lead to ocean phenomena like upwelling etc due to density differences

18 words

Diagram

Distribution of oceanic salinity across world oceans in ppm

  • Clear definition of oceanic salinity
  • Includes specific examples (Red Sea, Dead Sea)
  • Mentions El Niño phenomenon

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Page 13

Topper

Medha Anand

AIR 13

Subject & Paper

GS1GS1

Topic

Salient features of World's Physical Geography

Oceanic Features

Oceanic Salinity Variation

Writing Stats

145

Total words

9

Paragraphs