Consider the following statements regarding Ocean currents

1.Surface currents transport 90% of ocean water, while deep water currents transport only 10% of ocean water

2.While surface winds are wind-driven, the deep water currents are density- and haline-driven. 

Select the answer using the code given below:

  1. 1 only
  2. 2 only
  3. Both 1 and 2
  4. Neither 1 nor 2

Answer (Detailed Solution Below)

Option 2 : 2 only

Detailed Solution

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The correct answer is option 2

Key Points

  •  Surface currents transport only 10% of ocean water, while deep ocean currents move 90% of the ocean’s volume.
  •  Surface currents are driven by winds, such as the Trade Winds, Westerlies, and Coriolis effect.
  •  Deep ocean currents are driven by density differences, influenced by temperature (thermo) and salinity (haline).
  •  The Global Conveyor Belt (Thermohaline Circulation) regulates Earth's climate by distributing heat across oceans.
  •  Upwelling and downwelling occur due to differences in water density, supporting marine biodiversity.

 Additional Information:

  • Examples of Major Surface Currents:
  • Warm currents: Gulf Stream (Atlantic), Kuroshio Current (Pacific)
  • Cold currents: California Current (Pacific), Canary Current (Atlantic)
  • Examples of Deep Ocean Currents:
  • North Atlantic Deep Water (NADW) – Forms near Greenland.
  • Antarctic Bottom Water (AABW) – Coldest, densest water mass in the world.

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