Which outcome results when coastal upwelling weakens unexpectedly along the western coastline of South America?

💡 Explanation

When coastal upwelling weakens, nutrient transport from deep ocean layers to the surface decreases because wind-driven surface water replacement diminishes, limiting phytoplankton growth. Therefore, phytoplankton biomass declines, rather than an increase in fog, strengthened trade winds, or reduced thermocline depth, which require different atmospheric conditions.

• Which mechanism creates crevasse splays when floodwater overtops a natural levee along a river?
• Which mechanism maintains lake level stability despite seasonal inflow variation within glacial lakes formed by isostatic rebound?
• Which outcome occurs when a barrier island migrates landward?
• Which mechanism drives the observed periodic changes in global thermohaline circulation strength?
• Which effect primarily drives oxbow lake formation during highly variable discharge events?
• Which mechanism causes localized ocean acidification within a subtropical gyre's convergence zone?