Which mechanism is disrupted by El Niño events, causing widespread marine ecosystem effects?

💡 Explanation

During El Niño, weakened trade winds reduce coastal upwelling because the normal pressure gradient diminishes, suppressing the upwelling of cold, nutrient-rich waters. Therefore, disruption of coastal upwelling occurs, rather than affecting polar ice, geothermal activity, or tidal phenomena which operate independently of El Niño.

• Which mechanism influences surface water temperature variability within subtropical gyres?
• Which mechanism influences the orientation of cirques during glacial formation on a large mountain range?
• Which outcome increases when concentrated animal feeding operations discharge wastewater onto karst topography?
• Which phenomenon causes deflection of large-scale ocean currents influencing global heat distribution through the Coriolis effect?
• Which long-term outcome results when construction prevents deep soil horizon bioturbation by earthworms?
• Which risk increases when an earthquake occurs near fine-grained unconsolidated sediment deposits?