Sentences with phrase «ice discharge»
The phrase "ice discharge" refers to the process of ice or frozen water being released or flowing out from a particular place, such as a glacier or ice sheet, into a body of water like a lake or ocean. Full definition
Annual ice discharge from this region as a whole has increased 77 percent since 1973.
nasa.gov
From 2008 to 2015, continent - wide rates of ice discharge increased by about 36 billion tons per year.
The suspected triggers for accelerated ice discharge on both continents include surface warming and melt runoff, ocean warming, and circulation changes.
«With the widespread changes seen in Antarctic sea ice conditions over the last few years, this process could be affecting other glaciers around Antarctica and the volume of ice they discharge into the ocean,» he added.
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.
Thus, could ice discharge at Greenland destabilise ice in Antarctica?
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.
New research finds that the melting of a rather small ice volume on East Antarctica's shore could trigger a persistent ice discharge into the ocean.
Over the past few years, Operation IceBridge measured the thickness of many of Greenland's glaciers, which allowed researchers to make a more accurate calculation of ice discharge rates.
Complete ice discharge from the affected region in East Antarctica takes five thousand to ten thousand years in the simulations.
Freshwater flux from Greenland is composed of melt runoff from ice and tundra runoff as well as ice discharge («calving» of icebergs).
The soft sediments beneath these ice streams facilitated high ice discharge [28, 29].
However, net loss of ice mass could occur if dynamical ice discharge dominates the ice sheet mass balance.
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.
In recent years, computer model projections have shown an increasing dominance of surface melt, but a limited amount of glacier thickness data made pinpointing a figure for ice discharge difficult.
Projecting Antarctic ice discharge using response functions from SeaRISE ice - sheet models.
(Ice sheet mass balance (MB) is the difference between surface mass balance (SMB) and solid ice discharge across the grounding line (D).)
In a new study published in the journal Geophysical Research Letters, researchers calculated ice discharge rates for 178 Greenland glaciers more than one kilometer (0.62 miles) wide.
Of the 178 glaciers studied, 15 accounted for more than three - quarters of ice discharged since 2000, and four accounted for roughly half.
D denotes change in ice discharge while SMB denotes the net surface mass balance (accumulation minus ablation).
For the first time, findings based on observations and computer simulations all point to the same conclusion: the huge Amundsen Sea sector of West Antarctica has begun an irreversible ice discharge, and nothing can now halt the subsequent drainage of the entire basin.
Rapid changes in ice discharge from Greenland outlet glaciers.
The melting of a rather small ice volume on East Antarctica's shore could trigger a persistent ice discharge into the ocean, resulting in unstoppable sea - level rise for thousands of years to come.
Increased West Antarctic and unchanged East Antarctic ice discharge over the last 7 years.
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.
In the future, high - end estimates of ice discharge and regional effects, such as local thermal expansion and coastal subsidence, place the upper limits of relative sea - level rise for the Netherlands at 0.65 to 1.3 m by 2100, excluding gravitational effects.
Studying surging glaciers could also offer insights into grander - scale ice flows with global consequences: the movements of the ice sheets in Antarctica and Greenland, which can change abruptly, altering the ice discharges that affect sea level.
«Konrad and colleagues have extended a method that has promise for future monitoring of ice discharge into the ocean on a continent - wide scale,» Ryan Walker, a NASA ice researcher, wrote in an accompanying review piece.
Mouginot J, Rignot E, Scheuchl B. Sustained increase in ice discharge from the Amundsen Sea Embayment, West Antarctica, from 1973 to 2013.
If they thin and melt away, this support is removed, leading to increase ice discharge, accelerated flow, grounding line recession8, 9, 10, and marine ice sheet instability.
Thicker ice in deeper water drives increased calving, increased ice discharge, and further grounding - line recession in a positive feedback loop2, 3.
A recent study by Mouginot and colleagues detected acceleration and increased ice discharge.
The large acceleration in ice velocity and ice discharge in Pine Island Glacier from 2002 - 2008 coincided with rapid recession of its grounding line.
Leakage of the Greenland Ice Sheet through accelerated ice flow AU: * Rignot, E AF: Jet Propulsion Laboratory / Caltech, MS 300-319 4800 Oak Grove Drive, Pasadena, ca 91109 - 8099 United States AB: A map of coastal velocities of the Greenland ice sheet was produced from Radarsat - 1 acquired during the background mission of 2000 and combined with radio echo sounding data to estimate the ice discharge from the ice sheet.
On individual glaciers, ice discharge was compared with snow input from the interior and melt above the flux gate to determine the glacier mass balance.
The Pfeffer paper is helpful, putting plausible constraints on the speed of ice discharge.