Veille 2.1

Total is 20% higher than thought and may have implications for collapse of globally important north Atlantic ocean currents The Greenland ice cap is losing an average of 30m tonnes of ice an hour due to the climate crisis, a study has revealed, which is 20% more than was previously thought. Some scientists are concerned that this additional source of freshwater pouring into the north Atlantic might mean a collapse of the ocean currents called the Atlantic meridional overturning circulation (Amoc) is closer to being triggered, with severe consequences for humanity.

The Greenland Ice Sheet covers 1.7 million square kilometers (660,200 square miles) in the Arctic. If it melts entirely, global sea level would rise about 7 meters (23 feet), but scientists aren't sure how quickly the ice sheet could melt. Modeling tipping points, which are critical thresholds where a system behavior irreversibly changes, helps researchers find out when that melt might occur.

Scientists are getting a better handle on how fast Greenland's ice is flowing out to sea. Old models that used Antarctica as a baseline were way off the mark.

Giant ice sheets, ocean currents and permafrost regions may already have passed point of irreversible change

For the first time on record, precipitation on Saturday at the summit of Greenland — roughly two miles above sea level — fell as rain and not snow.

Greenland's enormous ice sheet has been struck by a "massive melting event," with enough ice vanishing in a single day last week to cover the whole of Florida in two inches (5 centimeters) of water, Danish researchers have found.

Greenland’s vast ice sheet is undergoing a surge in melting, with the amount of ice vanishing in a single day this week enough to cover the whole of Florida in two inches of water, researchers have found.

A range of studies have long indicated that attention should be paid to the effects of climate change on subsystems such as the Amazon, Greenland ice or permafrost. These effects have been debated for more than 20 years. Since then, thousands of pages have been written describing their interrelationships, warning of a coming disaster. As in this article published in Nature by key figures in climate science, or this article published in National Geographic. However, despite the seriousness of the issue, mainstream media silence remains thunderous. With Ferran Puig Vilar

Sea ice land. 7 Tipping points are analysed here. Climate tipping points, elements of the Earth system in which small changes in global temperature can kick off reinforcing loops that ‘tip’ a system into a profoundly different state, accelerating heat waves, permafrost thaw, and coastal flooding — and, in some cases, fueling more warming.