Giant ice mountains on the other side of Earth once dictated Australia’s climate – new study

The Conversation reports on new research from UNSW that reveals a striking connection: North American ice sheets that towered over the landscape forty-nine thousand years ago shaped Australia's rainfall despite never reaching the continent. During this period in the last ice age, massive ice sheets covered much of present-day Canada and the northern United States. The key finding wasn't about the ice sheets' reflective surfaces—it was their sheer height. These walls of ice, several kilometers tall, disrupted the normal paths of winds moving around the globe, acting much like continent-sized mountain ranges in the atmosphere. The redirected winds rippled through the tropics, shifting rainfall patterns southward and strengthening Australia's summer monsoon. The discovery demonstrates that Earth's climate operates as a deeply interconnected system, where changes in one hemisphere can influence weather patterns on the opposite side of the planet.

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