Question

Explain how an increase of the annual melt season in Antarctica can have global effects.
in paragraph

Answer 1

An increase in Antarctica’s annual melt season has global effects because more surface melting and meltwater weaken and fracture ice shelves that currently hold back inland glaciers, causing those glaciers to accelerate and raise global sea levels, threatening coastal cities and ecosystems worldwide. The added freshwater and icebergs also change ocean salinity and stratification, disrupting the formation of Antarctic Bottom Water and the global overturning circulation that redistributes heat and carbon, which can alter regional climates and weather patterns far from the Southern Ocean. Reduced ice and snow cover lower the Earth’s albedo, letting the Southern Ocean and atmosphere absorb more heat and reinforcing global warming. Finally, changes in ocean chemistry and nutrient supply affect marine ecosystems and fisheries, while increased iceberg hazards and shifting storm tracks carry economic and safety consequences for shipping and coastal communities around the world.