While this event was natural and expected, scientists predict further
calving events as temperatures rise, potentially unleashing several feet of sea level rise.
Icebergs rarely form in this manner; in fact, large
calving events happen just once every 40 — 50 years.
Detecting glacialquakes is important because glaciers appear to accelerate after large
calving events.2 The frequency of glacialquakes — which has been rising since the late 1990s — has increased particularly since 2002.3 In fact, the number of quakes in 2005 was twice that of 2001.1 In late summer of 2005, glacial seismic activity was almost five times greater than in the winter months — most likely owing to seasonal changes in temperature.1, 3
«The 2017 Pine Island Glacier and Larsen C Ice Shelf
Calving Events» presented by Christopher Shuman.
It also has some good shots of a couple of
calving events.
If there were truly an increase in glacier
calving events (due to warming or any other cause), the best evidence would be an increase in iceberg numbers starting in 1900 for example.
These observations are being collected in our project over a period of several years as we build up a statistical data base of
calving events.
Scientists have become growingly concerned about ice shelf collapse, and in 2016, they proposed a new rule allowing for special study areas following collapse or massive
calving events.
Recent massive
calving events at Larsen C's smaller neighbors do have a stronger link to climate change, though.
Around that time, a string of especially warm summers triggered increased melting and
calving events, which have continued to the present day.
«In the ensuing months and years, the ice shelf could either gradually regrow, or may suffer further
calving events which may eventually lead to collapse — opinions in the scientific community are divided,» Luckman said.
«The ability to routinely monitor
calving events is a new approach,» said Bruce Molnia, research geologist with the U.S. Geological Survey, who has written extensively on Alaska's glaciers and has documented their change over time.
The team's next steps include looking more closely at specific ocean swell events and sea ice conditions during known ice shelf collapses and large iceberg
calving events.
Even relatively large
calving events, where tabular ice chunks the size of Manhattan or bigger calve from the seaward front of the shelf, can be considered normal if the ice sheet is in overall balance.
«We've never had such tools as we have now to really measure what happens after big
calving events.»
When the shelf broke, she and colleagues predicted, it would be the largest
calving event in decades.
We have previously shown that the new configuration will be less stable than it was prior to the rift, and that Larsen C may eventually follow the example of its neighbour Larsen B, which disintegrated in 2002 following a similar rift - induced
calving event.
«With this large
calving event, and the availability of satellite technology, we have a fantastic opportunity to watch this natural experiment unfolding before our eyes.
It's the first time that researchers have been able to put boots on the ground so quickly after a massive
calving event, and they have a lot of questions.
Their article asserts that
a calving event is not necessarily due to changes in environmental conditions and may simply reflect the natural growth and decay cycle of an ice shelf.
«Now we want to understand how the ice shelf will react to
this calving event.»
Their observations show that since
the calving event, the berg has started to drift away from the Larsen - C, with open ocean clearly visible in the ~ 5 kilometre gap between the berg and the ice - shelf.
There is a risk that Larsen C may eventually follow the example of its neighbour, Larsen B, which disintegrated in 2002 following a similar rift - induced
calving event in 1995.
The goal is to track the dynamic response of the ice to
the calving event, both short - term and long - term.
Larsen B experienced a major iceberg -
calving event in 1995, followed by gradual retreat and then complete collapse seven years later.
Larsen C may follow a similar pattern, he says, although it's not clear how soon collapse might follow the imminent
calving event.
«The new branch is heading off more toward the ice front, so it's more dangerous and more likely to cause
this calving event to occur» than the main branch, he says.
A large
calving event at the Zachariae glacier made the news in May 2013, and Khan and his team witnessed and filmed a similar event in July.
Larsen B collapsed shortly after its major
calving event while the Wilkins ice shelf has continued to shed large chunks of ice since 2008.
However, this iceberg
calving event is a natural process, part of how the ice shelf regularly calves — this ice shelf spawns huge icebergs every 6 - 10 years.
«Think of
a calving event kind of like a little earthquake,» O'Neel told OurAmazingPlanet.
Locally big waves when
a calving event occurs!
They caught a fresh
calving event and described the cleaved slab as being about the height of two Empire State Buildings.
This is a 2001 image and the large rift beyond this that spread across the glacier in 35 days or so, led to an iceberg
calving event.
You can see this amazing and rather chilling
calving event in action in the August 14 to August 16 satellite imagery comparison developed by Espen Olsen below:
(Jakobshavn experiences what is likely it's largest
calving event yet on Sunday, August 16, 2015.
The record heat and melting coincided with a massive
calving event at Petermann Glacier, which also occurred in mid July.
This extraordinary ice
calving event happened in spite of it being the middle of winter at the South Pole.
For example a large 1987
calving event removed 100 years of ice accumulation from the Ross Ice Shelf in just one day, an amount second only to the loss of the Larsen Ice Shelf.
That earlier warming was associated with a large
calving event of the Pine Island Glacier that likely occurred in association with an EL Nino event.
In October 2011, researchers flying in NASA's Operation IceBridge campaign made the first - ever detailed, airborne measurements of a major iceberg
calving event while it was in progress.
These before - and - after photographs show Petermann Glacier in July 2009, before
the calving event, and again in...
Also, in the movie, the Ilulissat Glacier calving shown was attributed to the 2009
calving event.
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.
[Response: You are confusing a normal and periodic
calving event with the total collapse of an ice shelf — kind of like the difference between a haircut and decapitation.
Not exact matches
It's vital we achieve this or we are likely to see more
calving of large ice shelves, similar to the recent Larsen C
event.»
Reporting this week in the journal Nature Climate Change Dr Hogg and Dr Gudmundsson, examine the
events leading up to this dramatic natural phenomenon and discuss how
calving of huge icebergs affects the stability of Antarctic ice shelves.
Climate signals are not clear enough to attribute the
event to rising levels of carbon dioxide, but human activity may have contributed to its
calving nonetheless.
Scientists witnessed gigantic
events this year — a neutron star collision and a
calving Antarctic iceberg — and also demonstrated the transformative power of more minuscule changes.
If you missed my last sale post, Cole Haan's Fall
event is wrapping up, and my narrow -
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