Sentences with phrase «increased ice discharge»

Such accelerated flow leads to increased ice discharge into the ocean, but the relevant dynamical processes are not properly understood nor included in continental ice - sheet models, the main difficulty being the treatment of grounding - line migration in response to increased melting of ice by the ocean.

Is it any wonder that the Ice Sheet without geothermal activity is remarkably stable and the Ice Sheet that has increased ice discharge has vast evidence of geothermal activity?

A recent study by Mouginot and colleagues detected acceleration and increased ice discharge.

Thicker ice in deeper water drives increased calving, increased ice discharge, and further grounding - line recession in a positive feedback loop2, 3.

Not exact matches

From 2008 to 2015, continent - wide rates of ice discharge increased by about 36 billion tons per year.

Paper: Increased West Antarctic and unchanged East Antarctic ice discharge over the last 7 years Alex S. Gardner et al https://www.the-cryosphere.net/12/521/2018/tc-12-521-2018.pdf

Freshening of the ocean can result from numerous factors — the melting of ice, freshwater discharge from rivers, or increased precipitation at high latitudes.

Sustained increase in ice discharge from the Amundsen Sea Embayment, West Antarctica, from 1973 to 2013.

Landsat 7 and 8 imagery from 2013 through 2015, when compared to earlier estimates based on synthetic aperture radar, indicated ice discharge of 1,932 ± 38 gigatons per year — an increase of 35 ± 15 gigatons per year since roughly 2008.

But the results put speculation of monotonic or exponential increases in Greenland's ice discharge to rest, an idea that some had raised after a doubling over a few years was reported in 2004 for Jakobshavn Isbræ (Greenland's largest outlet glacier).

The environmental changes brought on by ocean acidification could pose a significant threat to Arctic ecosystems that are already facing challenges from changes in sea ice distribution, warming and increased freshwater discharge.

In the Arctic, there has been increased Eurasian river discharge to the Arctic Ocean, and continued declines in the ice volume of Arctic and sub-Arctic glaciers and the Greenland ice sheet (very high confidence).

Although Zwally calculated the net «mass gains from snow accumulation exceeded losses from ice discharge by about 112 and 82 Gt / year respectively during the 1992 - 2001 and 2003 - 08 measurement periods», he also reported that the rate of ice loss along the west Antarctic coast and the peninsula had increased from 64 GT / year to 135 GT / year during those same periods.

Scenarios of deglaciation (Meehl et al., 2007 Section 10.7.4.4) assume that any such increase would be outweighed by accelerated discharge of ice following weakening or collapse of an ice shelf due to melting at its surface or its base (*).

These approaches, however, haven't taken into account some physical processes that can quickly increase ice sheet discharge, such as the collapse of terminal ice cliffs and the breakup of floating ice shelves caused by a process known as hydrofracturing.

Including the effects of physical mechanisms that can quickly increase ice sheet discharge significantly raises sea level rise projections under high - emission scenarios.

Scientists have recently observed major changes in these glaciers: several have broken up at the ocean end (the terminus), and many have doubled the speed at which they are retreating.2, 5 This has meant a major increase in the amount of ice and water they discharge into the ocean, contributing to sea - level rise, which threatens low - lying populations.2, 3,5 Accelerated melting also adds freshwater to the oceans, altering ecosystems and changing ocean circulation and regional weather patterns.7 (See Greenland ice sheet hotspot for more information.)

The recent, marked increase in ice discharge from many of Greenland» slarge outlet glaciers has upended the conventional view that variations in ice - sheet mass balance are dominated on short time scales by variations in surface balance, rather than ice dynamics.

Annual ice discharge from this region as a whole has increased 77 percent since 1973.

Amplifying feedbacks include increased absorption of sunlight as melting exposes darker surfaces and speedup of iceberg discharge as the warming ocean melts ice shelves that otherwise inhibit ice flow.

The modest increase in ice discharge over the past 7 years is contrasted by high rates of ice sheet mass loss and distinct spatial patters of elevation lowering.

These rapid changes are the result of increased discharge from grounded ice into the ocean and from increased ice melting, which more than outweigh increases in surface accumulation.

The researchers predict that the Zachariae glacier will go on retreating for another 20 to 30 years, while continuing to increase its discharge of ice.

Using an optimized flux gate, ice discharge from Antarctica is 1929 ± 40 Gigatons per year (Gt yr − 1) in 2015, an increase of 36 ± 15 Gt yr − 1 from the time of the radar mapping.

Credits: NASA's... From Zwally as well, «We're essentially in agreement with other studies that show an increase in ice discharge in the Antarctic Peninsula and the Thwaites and Pine Island region of West Antarctica,» said Jay Zwally, a glaciologist with NASA Goddard Space Flight Center in Greenbelt, Maryland, and lead author of the study, which was published on Oct. 30 in the Journal of Glaciology.