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Question

Consider the following statements :
1. Ocean currents are dominated by huge surface gyres that are driven by the global surface wind pattern.
2. Equatorial currents move cold water westward and then poleward along the east coasts of continents.
With regard to the statements given above, which of the following is correct?

This question was previously asked in
CDS 2 2024 Maths Question Paper (01-Sep-2024)
The correct answer is
Statement 1 is correct, but statement 2 is false.

Analyzing Statement 1: Ocean Currents and Wind Patterns

The first statement posits that ocean currents are significantly influenced by large surface gyres, which are themselves driven by global surface wind patterns. This statement is fundamentally correct. Large-scale wind systems, like the trade winds and westerlies, exert friction on the ocean surface, transferring energy and initiating movement. This movement, influenced by factors like the Coriolis effect, organizes into vast, circular current systems known as gyres. These surface gyres are indeed the dominant feature of large-scale ocean circulation in major ocean basins.

Analyzing Statement 2: Characteristics of Equatorial Currents

The second statement describes equatorial currents as moving cold water westward and then poleward along the east coasts of continents. Let's break this down:

  • Direction: Equatorial currents do flow predominantly westward, driven by the trade winds near the equator.
  • Water Temperature: However, these currents typically transport warm tropical or subtropical water, not cold water. Cold water currents are generally found moving towards the equator along the western sides of ocean basins (e.g., California Current, Peru Current).
  • Poleward Movement & Coast: While currents do move poleward along the east coasts of continents (like the Gulf Stream), these are warm currents originating from lower latitudes, and this poleward flow is a consequence of the larger gyre system, not the primary definition or function of the equatorial current itself. Furthermore, the statement incorrectly associates this poleward movement with equatorial currents carrying cold water.

Therefore, the description of equatorial currents carrying cold water and moving poleward along the east coasts is inaccurate. Statement 2 is false.

Conclusion on Statements

Based on the analysis:

  • Statement 1 is correct, accurately describing the wind-driven nature of ocean gyres.
  • Statement 2 is false, mischaracterizing the temperature and direction/location of water transport associated with equatorial currents.

This leads to the conclusion that only Statement 1 is correct.

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