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glacier
Small increase in temperature of intruding water could lead to very big increase in loss of ice, scientists say
Scientists now have a better understanding of the risks ahead and a new early warning signal to watch for.
As the Arctic warms, shrinking glaciers are exposing bubbling groundwater springs which could provide an underestimated source of the potent greenhouse gas methane, finds new research published in Nature Geoscience. The study, led by researchers from the University of Cambridge and the University Center in Svalbard, Norway, identified large stocks of methane gas leaking from groundwater springs unveiled by melting glaciers.
Seafloor landforms reveal that ice sheets can collapse at 600 metres per day.
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
Understanding the recent history of Thwaites Glacier, and the processes controlling its ongoing retreat, is key to projecting Antarctic contributions to future sea-level rise. Of particular concern is how the glacier grounding zone might evolve over coming decades where it is stabilized by sea-floor bathymetric highs. Here we use geophysical data from an autonomous underwater vehicle deployed at the Thwaites Glacier ice front, to document the ocean-floor imprint of past retreat from a sea-bed promontory. We show patterns of back-stepping sedimentary ridges formed daily by a mechanism of tidal lifting and settling at the grounding line at a time when Thwaites Glacier was more advanced than it is today. Over a duration of 5.5 months, Thwaites grounding zone retreated at a rate of >2.1 km per year—twice the rate observed by satellite at the fastest retreating part of the grounding zone between 2011 and 2019. Our results suggest that sustained pulses of rapid retreat have occurred at Thwaites Glacier in the past
From the Amazon to the Andes and the snowy depths of Patagonia, extreme weather and climate change are causing mega-drought, extreme rainfall, deforestation and glacier melt across the Latin America and the Caribbean (LAC) region, according to a UN report published on Friday.
Most marine-terminating glaciers in the Northern Hemisphere are shrinking; some have completely left the water.
Patagonian ice fields are among some of the fastest-melting glaciers on the planet. As these glaciers disappear, the earth that once lay beneath them is rebounding upwards at rates much faster than expected.
Over the weekend, physical climate scientist David Holland made it to his research base on the Thwaites Glacier — a vast, unstable and vital ice formation in Southern Antarctica that researchers have scrambled to understand.
The accelerating melting of the Himalayan glaciers threatens the water supply of millions of people in Asia, new research warns.
Cracks and fissures stoke fears of breakup that could lead to half-metre rise in global sea levels – or more
The loss of its buttressing ice shelf could hasten the demise of the “Doomsday Glacier”
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.
Analysis shows significant risk of cascading events even at 2C of heating, with severe long-term effects. Ice sheets and ocean currents at risk of climate tipping points can destabilise each other as the world heats up, leading to a domino effect with severe consequences for humanity, according to a risk analysis. Tipping points occur when global heating pushes temperatures beyond a critical threshold, leading to accelerated and irreversible impacts.
