Sentences with phrase «observed glacier retreat»

Not exact matches

Using data from NASA missions observing Earth, researchers at the University of California, Irvine have created new maps of the bed topography beneath a score of glaciers in southeast Greenland, thereby gaining a much better understanding of why some are undergoing rapid retreat and others are relatively stable.

But scientists increasingly attribute much of the observed grounding line retreat — particularly in West Antarctica — to the influence of warmer ocean water seeping beneath the ice shelves and lapping against the bases of glaciers, melting the ice from the bottom up.

This remarkable correlation is supported by observations by other scientific teams who had already observed traces of glacier melting and retreat, as well as evidence of subsurface ice, in the former polar regions.

Two new studies by researchers at the University of California, Irvine and NASA have found the fastest ongoing rates of glacier retreat ever observed in West Antarctica and offer an unprecedented look at ice melting on the floating undersides of glaciers.

In the U.S. this is perhaps most famously observed in Glacier National Park, where the terminus of glaciers have retreated by several kilometers in the past century, and could be gone before the next century (see e.g. the USGS web site, here, and here).

The observed acceleration, retreat of the grounding line, thinning of the lower section of the glacier and the observed elevation of the basal topography provide no indication that this is not a weak underbelly of WAIS.

We propose that the combined warming trend of 0.25 K per decade may be sufficient to account for the observed retreat of the Himalayan glaciers

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Similar patterns of ice calving and retreat leading to rapid glacier acceleration have also been observed in Greenland.

Widespread retreat of glaciers has been observed along the southeastern margin of Greenland.

In 1994, 46 of 47 glaciers observed were retreating (Pelto, 1993).

Changes occurring due to glacier retreat have been observed in the Lewis Glacier Basin.

We can also observe the effects of global warming in worldwide glacier retreat, declining Arctic ice sheets, sea level rise, warming oceans, ocean acidification, and increased intensity of weather events.

Simultaneously the best studied Greenland glacier, the Jakobshavn, began retreating from its Little Ice Age maximum with it fastest observed retreat of 500 meters per year between 1929 and 1942.

Global warming must be the primary cause of glacier retreat, which is occurring on a global scale, but observed rapid melt rates suggest that other factors may be involved.

«More than 65 % of the monsoon - influenced glaciers that we observed are retreating, but heavily debris - covered glaciers with stagnant low - gradient terminus regions typically have stable fronts,» the authors write, adding that «In contrast, more than 50 % of observed glaciers in the westerlies - influenced Karakoram region in the northwestern Himalaya are advancing or stable.»

But scientists increasingly attribute much of the observed grounding line retreat — particularly in West Antarctica — to the influence of warmer ocean water seeping beneath the ice shelves and lapping against the bases of glaciers, melting the ice from the bottom up.

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 observed general glacier retreat in the warming tropical Andes has increased significantly in recent decades (Francou et al., 2005).

Moon and Joughin (2008) observed that the retreat of the land terminating glaciers was relatively minor from 1992 - 2007, averaging 5 m / year or less.

The mean retreat of eight Mt. Baker glaciers from 1979 - 1998 was 197 m. Between 1979 and 1984, 35 of the 47 North Cascade glaciers observed annually by NCGCP had retreated.

As these 47 glaciers have retreated NCGCP has observed the development of nine new alpine lakes, occupying basins formerly filled by ice.

The acceleration to worry about is from changes in the calving front, and the resultant retreat and acceleration that has been observed on almost all Greenland marine terminating outlet glaciers.