Which risk is heightened when coastal upwelling is abnormally reduced due to persistent high atmospheric pressure?

💡 Explanation

When upwelling is reduced, nutrient replenishment from deep ocean layers decreases because the pressure gradient driving vertical water movement weakens, resulting in decreased marine phytoplankton productivity. Therefore reduced productivity results, rather than flooding, mangrove expansion, or red tides which are linked to nutrient excess or different water conditions.

• Which mechanism increases stream salinity when hydraulic fracturing occurs near shale deposits?
• Which geological process commonly generates strike-slip faults in Earth's crust?
• Which outcome occurs when a large iceberg melts within the relatively stable Western Pacific Gyre?
• Which mechanism causes reduced vertical nutrient circulation within stratified ocean regions?
• Which risk increases when pyroclastic flow encounters meltwater?
• Which process limits cirque glacier downcutting rates significantly?