Sentences with phrase «glacier calving front»

The thermocline adjacent in the sea adjacent to the glacier calving front (where ice is discharged) lowered by 250 meters in the austral summer of 2012.

Change was afoot: after 50 years of apparent stability, the glacier calving front was retreating, and the grounding line was retreating indicating reduced bedrock anchoring.

Not exact matches

RETREATING ICE Jakobshavn Glacier in western Greenland (its front edge, where ice is calving into the ocean, shown here in 2012) is one of the world's fastest - shrinking glaciers.

«As the glacier's calving front retreats into deeper regions, it loses ice — the ice in front that is holding back the flow — causing it to speed up,» Joughin clarifies.

At its calving front, where the glacier effectively ends as it breaks off into icebergs, some of the ice melts while the rest is pushed out, floating into the ocean.

This means that, even though the glacier is flowing towards the coast and carrying more ice into the ocean, its calving front is actually retreating.

The calving front of the glacier is now located in a deeper area of the fjord, where the underlying rock bed is about 1300 metres below sea level, which the scientists say explains the record speeds it has achieved.

The most obvious example of this is the case of calving glaciers where their gross behaviour may relate more to water depth at the calving front than small - scale climate variations.

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.

More specifically, using digital scans of paper maps based on aerial imagery acquired by the U.S. Geological Survey, along with modern - day satellite imagery from a variety of platforms, the authors digitized a total of 49 maps and images from which they calculated changes in the terminus positions, ice speed, calving rates and ice front advance and retreat rates from 34 glaciers in this region over the period 1955 - 2015.

I suppose that may have to do with in - between advancing of the glacier's calving front?

Historic photos and maps (from the 1800's to present) indicate a long term retreat of ice calving fronts on Greenland's glaciers.

The most obvious example of this is the case of calving glaciers where their gross behaviour may relate more to water depth at the calving front than small - scale climate variations.

The reduced resistive force at the calving front is then propagated up glacier via longitudinal extension in what R. Thomas calls a backforce reduction (Thomas, 2003 and 2004).

Thinning causes the glacier to be more buoyant, even becoming afloat at the calving front, and is responsive to tidal changes.

On Jakobshavn the acceleration began at the calving front and spread up - glacier 20 km in 1997 and up to 55 km inland by 2003 (Joughin et al., 2004).

Four GPS receivers monitored ice flow from 55 to 171 km inland of the calving front at the center of the glacier (Scott and others, 2009).

The glacier to the north (San Rafael) also has well - developed morianes systems and it, too, was once a piedmont lobe but now has a calving front.

If the ice upstream from the calving front warms from whatever it was does that affect the flow rate of the glacier?

In part because the large Jakobshavn Isbrae moves so quickly, it is difficult to tell the glacier ice (right and top) from the many icebergs it has calved off (center front) into the fjord.

Mass balance transfer to the calving front is a slow process with a large lag time (centuries) and is not capable of playing a meaningful role in the recent relatively large and sudden glacier accelerations (Pfeffer, 2007).

The outlet glaciers have a balance of forces at the calving front.

The small protruding glacier tongue in the lower part of the picture belongs to Glacier Pierre Curie, which now ends a kilometre from the sea but in 1963 had a calving front about 600 m wide.

If the glacier thins than there is less friction at the calving front from the fjord walls and the fjord base, leading to greater flow.

This means that, even though the glacier is flowing towards the coast and carrying more ice into the ocean, its calving front is actually retreating, stated the press release.

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.