Sentences with phrase «of glacier mass»

Systematic investigations of glacier mass balance started after 1945, so these records are shorter than the instrumental climate records normally available in the vicinity.

Marshall's work is part of the seasonal and annual tracking of glacier mass balance by the federal government to help determine future water supply in major rivers.

For example, analyses of glacier mass balances, volume changes and length variations along with temperature records in the western European Alps (Vincent et al., 2005) indicate that between 1760 and 1830, glacier advance was driven by precipitation that was 25 % above the 20th century average, while there was little difference in average temperatures.

The authors concluded that, for the entire period, only 25 ± 35 percent of the glacier mass loss could be attributed to anthropogenic causes, but from 1991 to 2010, the glacier mass loss increased to 69 ± 24 percent.

But the World Glacier Monitoring Service has a graph of glacier mass balance to 2009 now available.

While the loss of glacier mass has continued for the past few decades with a slight increase in recent years, the rate of mass loss from the Greenland ice sheet has dramatically increased in the past decade and continues to increase.

As explained in the press release, the scientists began with the measure of sea level rise between 2005 and 2013, then deducted the amount of rise due to meltwater (e.g., melting ice sheets and loss of glacier mass worldwide) and then the amount of rise due to the expansion of water from the warming in the upper portion of the world's oceans (which scientists have good data on).

«As a result, the loss of glacier mass worldwide, along with the corresponding release of carbon, will affect high latitude marine ecosystems, particularly those surrounding the major ice sheets that now receive fairly limited land - to - ocean fluxes of carbon.»

As noted above, major advances from GRACE and other datasets now permit analyses of glacier mass loss that were not possible previously.

As predictors of glacier mass balance positive MEI values, El Nino, and warm phase PDO's favor negative balances, and cool phase PDO's and negative MEI values, La Nina, favor positive annual balances.

Not exact matches

The team found that, for the last 20 years, the glacier and ice cap mass loss has been exactly equal to the amount of meltwater runoff lost to the sea.

As a result, the coastal ice caps and glaciers lose their melting ice as run off 65 percent faster than they can recapture it — contributing to a loss of ice equivalent to roughly 14 percent of the total mass of Greenland.

For example, Kangerdlugssuaq glacier has lost mass from melting and, in its thinner form, has less weight to speed the flow of its ice toward the sea.

For instance, some experts think glaciers in the Karakoram are prone to surging because of their steepness; as mass builds up from heavy snowfalls near the top of a glacier, for example, gravity alone may trigger a surge.

They can block rivers, creating lakes that can later unleash floods, and by depleting glacier mass, they can threaten the flow of meltwater that downstream towns and farms may depend on.

When it's cold enough to form ice shelves that extend over the Antarctic land mass and into the ocean, much of what drops to the seafloor is sand and gravel that the glacier has picked up on its slow march from the continent's ice cap.

This allowed them to calculate the redistribution of mass on Earth's surface due to the melting of the Greenland and Antarctic ice sheets and mountain glaciers, and model the shift in Earth's axis.

Today, as warming waters caused by climate change flow underneath the floating ice shelves in Pine Island Bay, the Antarctic Ice Sheet is once again at risk of losing mass from rapidly retreating glaciers.

This is due to the thaw following the last ice age: the melting of glaciers lets the crust rebound, redistributing Earth's mass and leading to subtle changes in its axis of rotation.

In a recent study, Mathias Trachsel (Dept. of Biology, University of Bergen) and Atle Nesje (Dept. of Earth Science, University of Bergen and Uni Research Climate) used simple statistical models to assess and quantify the relative importance of summer temperature and winter precipitation for annual mass balances of eight Scandinavian glaciers.

The sun and moon tug on the planet, while the drift of continents, changes in ocean currents, and the rebounding of the crust since the retreat of ice age glaciers all shift mass around, altering Earth's moment of inertia and therefore its spin.

A clump of air molecules could fool an observer into thinking that something lies below — perhaps a glacier — so each satellite has what's known as a «proof mass» floating in a chamber inside, untethered to the satellite itself.

The data allowed them to calculate the redistribution of mass on Earth's surface due to the melting of the Greenland and Antarctic ice sheets and mountain glaciers, and the resulting rise in sea level.

Typically, this will continue slowly until the glacier finds equilibrium with several factors: its own mass, the shape of the fjord, and lastly, the climate.

Tibet's glaciers are also losing mass clearly, as scientists from the universities of Zurich, Tubingen and Dresden reveal using satellite - based laser measurements.

However, the measurements also bore some positive news: Some glaciers in the central and north - western part of the Tibetan Plateau have actually grown in mass.

The results now published in Environmental Research Letters seem to contradict the data from a satellite mission based on other measuring methods, which indicates a slight increase in mass in the glacier ice for an almost identical period of time.

However, most of the Antarctic glaciers are on land, and rapidly adding new ice shelf material to the floating mass will increase sea level rise.

Himalayan glaciers are beating a rapid retreat in the face of global warming, according to a flurry of recent reports by BBC and other mass media.

Published literature shows dramatic shifts in species» ranges as glaciers retreated, but little evidence of mass extinctions during that period (1).

At both locations, the long - term records show that summer warming has resulted in sustained mass loss, noted Shad O'Neel, head of the glacier research program at the USGS Alaska Science Center.

Additional precision in this study was provided by NASA's Gravity Recovery and Climate Experiment, or GRACE satellites, which can make detailed measurements of gravity and, as one result, estimate the mass of glaciers they are flying over.

But that could soon change, Rignot said, because the rate at which ice sheets are losing mass is increasing three times faster than the rate of ice loss from mountain glaciers and ice caps.

Whether the loss of mass by the glaciers is due to natural variation or is caused by human - influenced warming of the oceans is not known for sure.

Marzeion, B., A. H. Jarosch, and M. Hofer, 2012: Past and future sea - level change from the surface mass balance of glaciers.

Although that is unlikely to happen for many thousands of years, the ice sheet has increasingly lost mass over the last two decades, and the glaciers that serve as its outlet to the sea are accelerating.

And is the current large scale ablation seen on these glaciers due to these glaciers coming to some equilibrium with a warmer world due to coming out of the LIA and response times associated with the large masses involved?

Monckton says «The Antarctic, which holds 90 percent of the world's ice and nearly all its 160,000 glaciers, has cooled and gained ice - mass over the past 30 years, reversing a 6,000 - year melting trend.»

Evidence from glacial advance / retreat (e.g. the evidence from tropical Andean glaciers you cite above) is often difficult to interpret, because glacial mass balance represents in general a subtle competition between the influences of ablation (determined by changes in temperature thresholds reached) and accumulation (determined by changes in humidity and precipitation).

Consistent with observed changes in surface temperature, there has been an almost worldwide reduction in glacier and small ice cap (not including Antarctica and Greenland) mass and extent in the 20th century; snow cover has decreased in many regions of the Northern Hemisphere; sea ice extents have decreased in the Arctic, particularly in spring and summer (Chapter 4); the oceans are warming; and sea level is rising (Chapter 5).

«The strength of GRACE is it sees all the mass in the system, even though its resolution is not high enough to allow us to determine separate contributions from each individual glacier.»

Rising global temperatures have also made glaciers — ice masses that currently occupy nearly 10 percent of the world's total land area — increasingly unstable.

A total of over 5,000 measurements of glacier volume and mass changes since 1850 and more than 42,000 records from observations and reconstructions dating back to the sixteenth century were analyzed.

The Western Antarctic Peninsula has been rapidly cooling since 1999 -LRB--0.47 °C per decade), reversing the previous warming trend and leading to «a shift to surface mass gains of the peripheral glacier» (Oliva et al., 2017).

Negative mass balances on tributary glaciers can lead to thinning of the glaciers and ice shelves.

Acceleration of melting of ice - sheets, glaciers and ice - caps: A wide array of satellite and ice measurements now demonstrate beyond doubt that both the Greenland and Antarctic ice - sheets are losing mass at an increasing rate.

The Greenland, and possibly the Antarctic, ice sheets have been losing mass recently, because losses by ablation including outlet glaciers exceed accumulation of snowfall.

Unlike the great ice sheet of Antarctica, the Greenland ice sheet is melting both on its surface and also at outlet glaciers that drain the ice sheet's mass through deep fjords, where these glaciers extend out into the ocean and often terminate in dynamic calving fronts, giving up gigaton - sized icebergs at times.

«The signal of future glacier change in the region is clear: continued and possibly accelerated mass loss from glaciers is likely given the projected increase in temperatures,» Joseph Shea, a glacier hydrologist at the International Centre for Integrated Mountain Development (ICIMOD), Kathmandu, Nepal, who led the study, said in a statement.

Isabella Velicogna can use that information to «study the mass balance of the Greenland and Antarctic Ice Sheets and glaciers worldwide, in response to climate warming.»