Which outcome affecting marine ecosystems occurs during intense El Niño events when the thermocline deepens?

💡 Explanation

Reduced nutrient availability increases because the deepening of the thermocline prevents upwelling of nutrient-rich waters via density stratification; therefore, primary productivity decreases, rather than the opposite occuring with upwelling.

• Which outcome consistently follows increased crustal downwarping above subduction zones?
• Which coastal outcome increases without sediment replenishment behind a barrier island?
• Which widespread effect occurs when prolonged high-pressure systems stagnate over continental areas during summer?
• Which outcome occurs when a volcanic cinder cone erodes rapidly?
• Which outcome is caused when excessive freshwater influx weakens ocean gyre downwelling?
• Which downstream morphological change occurs because of high rates of solifluction impacting Arctic river valleys?