Britannica Sources used in this answer

How can global warming change rainfall, snowfall, ocean circulation, and glacier ice?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Diagram illustrating Earth's environmental spheres, with labeled sections showing the geosphere (land and crust), biosphere (living things), atmosphere (air), and hydrosphere (water), each extending vertically from the Earth's surface. — hydrosphere Earth's environment includes the atmosphere, the hydrosphere, the lithosphere, and the biosphere.

Global warming, driven by the buildup of greenhouse gases, significantly alters the hydrosphere by accelerating the water cycle and redistributing moisture globally.1

Rainfall and Snowfall

Warming temperatures increase evaporation rates, leading to more intense precipitation in some regions while causing severe drought in others. This shift makes reliable weather patterns, such as the South Asian monsoon, less predictable and more violent, increasing the risk of both flooding and water shortages.12

Ocean Circulation

Global warming may weaken the thermohaline circulation, or "great ocean conveyor belt." As glaciers and ice sheets melt, the influx of fresh water lowers the density of surface waters in the North Atlantic, potentially inhibiting the sinking motion that drives this global current system.34

Glacier Ice

Rising temperatures cause the melting of mountain glaciers and polar ice sheets, which contributes to sea level rise. While increased snowfall may offset some melting in certain areas, the overall trend is a reduction in ice mass, which further accelerates sea-level rise through both the addition of liquid water and the thermal expansion of warming oceans.156