Which term is a global-scale circulation phenomenon linked to ENSO cycles?

Which term is a global-scale circulation phenomenon linked to ENSO cycles?

• A. Southern Oscillation
• B. La Nina
• C. North Atlantic Deep Water
• D. Thermohaline Circulation

Answer: (A)

ENSO cycles involve coupled ocean–atmosphere changes, and the global-scale atmospheric pattern that accompanies them is the Southern Oscillation. It describes the shifts in sea-level pressure between the eastern and western Pacific, which drive changes in trade winds, rainfall, and ocean currents during El Niño and La Niña. The Southern Oscillation is the atmospheric counterpart that links ENSO to wide-reaching climate effects around the world. La Niña is the cool phase of ENSO, not the global circulation pattern itself; North Atlantic Deep Water and Thermohaline Circulation refer to broader oceanic processes not specifically tied to ENSO cycles.

ENSO cycles involve coupled ocean–atmosphere changes, and the global-scale atmospheric pattern that accompanies them is the Southern Oscillation. It describes the shifts in sea-level pressure between the eastern and western Pacific, which drive changes in trade winds, rainfall, and ocean currents during El Niño and La Niña. The Southern Oscillation is the atmospheric counterpart that links ENSO to wide-reaching climate effects around the world. La Niña is the cool phase of ENSO, not the global circulation pattern itself; North Atlantic Deep Water and Thermohaline Circulation refer to broader oceanic processes not specifically tied to ENSO cycles.