Two decades ago, the Greenland ice sheet was in approximate balance - ice loss at the edges
as glaciers calved into the ocean was balanced by ice gain in the interior from increased snowfall.
Usually, surface melt and ice flow (
as glaciers calve into the sea) are the two ways in which Greenland (and other places, like Canada) contribute water to the ocean.
Not exact matches
Warnings for shipping Molnia said a system for such tracking of
glaciers could provide important warning for shipping in the region
as calving, and the formation of icebergs, increases.
In a presentation Thursday at the Seismology Society of America's annual meeting in Anchorage, West showed that long - ignored data within the state's earthquake records faithfully capture dynamic change occurring above ground: ice breaking off of
glaciers and falling into water, the phenomenon known
as calving.
He noted that the equipment to track the seismic signals from
calving glaciers is expensive, and it's necessary to have a number of sensors in place —
as the Alaska network does — because to pinpoint the location of a
calving,
glacier scientists have to triangulate data from several sensors.
But there are some niggling doubts about whether the West Antarctic Ice Sheet could
calve into the sea more quickly than expected,
as the
glaciers contract.
«
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.
Can a rising sea level can act
as a boost for
glaciers calving into the sea and trigger a surge of ice into the oceans?
Pine Island
Glacier, the longest and fastest flowing
glacier in Antarctica, has
calved multiple icebergs,
as can be seen in a series of photos.
Alaska's
glaciers contributed to one third of the world's ice sheet losses from 2005 to 2010, but a new study suggests melting, not
calving as shown here, contributed to the most loss.
Guests on UnCruise Alaskan cruises are often treated to a
glacier calving show,
as seen below where guests from the Safari Endeavour witnessed massive chunks
calve from the face of Dawes
Glacier.
Marvel at
glaciers and witness the amazing spectacle of thunder and spray
as tremendous slabs of ice break off and «
calve» into the sea.
From Seattle cruise up Alaska's Inside Passage and enjoy the stunning vistas of majestic mountains,
calving glaciers and glistening blue waters
as your luxurious ship glides serenely along.
Can a rising sea level can act
as a boost for
glaciers calving into the sea and trigger a surge of ice into the oceans?
So a 3-fold increase in output
glacier velocity does not count
as «extensive sustained
calving»?
So long
as an ice sheet gains an equal mass through snowfall
as it loses through melt, ablation, and
calving from
glaciers and ice shelves, it is said to be in balance.
Here, ice is loss by melting rather than iceberg
calving as when
glaciers meet the sea.
As a rough estimate, half of the current ice loss in West Antarctica is by melting where the
glaciers meet the ocean, and half is by
calving.
The rapid melting of Kangerdlugssuaq
glacier has produced a special category of earthquake known
as a glacialquake.1, 3 Once thought to occur when glacial ice strikes solid earth beneath it, glacialquakes are now attributed to lurching that occurs when parts of the
glacier break off (
calve) into the ocean.4, 5
Scientists know these processes can lead to collapse, because it's already happening: In Greenland, the Jakobshavn
glacier is in rapid retreat, with the unstable
calving cliff now more than 250 feet high, about
as tall
as the Statue of Liberty.
As the Arctic region warms, Greenland glaciers such as Jakobshavn have been thinning and «calving» — or breaking off — icebergs further and further inlan
As the Arctic region warms, Greenland
glaciers such
as Jakobshavn have been thinning and «calving» — or breaking off — icebergs further and further inlan
as Jakobshavn have been thinning and «
calving» — or breaking off — icebergs further and further inland.
Pine Island
Glacier, the longest and fastest flowing
glacier in Antarctica, has
calved multiple icebergs,
as can be seen in a series of photos.
This was the second large
calving event off this
glacier in just two years: the iceberg that broke away in August 2010 was twice
as large.