Which effect dramatically alters ocean currents and weather patterns during an El Niño event?

💡 Explanation

During an El Niño event, a weakening of the trade winds occurs because the pressure gradient between the eastern and western Pacific reverses, reducing wind strength. Therefore, a weakening of trade winds best describes this, rather than upwelling intensification, jet stream strengthening, or thermohaline increase, representing distinct oceanic changes.

• Which mechanism causes the aridity observed on the leeward side of mountain ranges bordering major river streams?
• Which risk dramatically intensifies when a coastal levee constructed on soft, compressible soil experiences prolonged tidal loading?
• Which mechanism causes the braiding of a stream flowing from a melting glacier at high altitude?
• Which process limits alluvial fan deposition at a tectonic basin's distal edges?
• Which outcome results when a meandering stream breaches its levee system during high discharge?
• Which risk increases after a large inland earthquake ruptures along a transform vault zone far from coastlines?