In August, warmer conditions returned, which combined with a rather diffuse ice cover in the Beaufort and Chukchi seas, has led to a speed - up in the rate of
ice loss at the beginning of August, particularly in the Chukchi Sea.
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.
One decade ago,
the ice loss at the edges had increased and Greenland was losing around 100 billion tonnes of ice every year.
No research papers from scientists in the field have predicted
ice loss at the rate it has been happening.
The ice gained in the interior is roughly balanced by
the ice loss at the edges.
It seems clear that the SSTAs are a function of seasonal sea
ice loss at the surface.
I think that GRACE last estimated
ice loss at about 500 billion tonnes per year.
So if the margin was lost without
ice loss at the center, the new margin having lost its support would become very unstable and the whole ice sheet would to have to lose volume to establish a new equilibrium.
For a separate study, the NASA Jet Propulsion Laboratory's Ala Khazendar — a co-author of Scheuchl's paper — measured
ice loss at the bottom of the three glaciers, which he suspected might be influencing the changes in their grounding lines.
New research suggests that as early as 2090, rates of
ice loss at the site could exceed gains from new snowfall.
Despite this effect, the known
ice loss at both poles suggests that embedded in the local rises is a signal of current climate change — researchers just have to tease it out.
Not exact matches
New York Islanders assistant coach Brent Thompson has been suspended for two games due to the «inappropriate and abusive comments he directed
at the on -
ice officials» in Thursday's 2 - 1 overtime
loss to the Rangers.
«West Greenland
Ice Sheet melting at the fastest rate in centuries: Weather patterns and summer warming trend combine to drive dramatic ice loss.&raq
Ice Sheet melting
at the fastest rate in centuries: Weather patterns and summer warming trend combine to drive dramatic
ice loss.&raq
ice loss.»
Two games were played, Saturday,
at the SUNY Broome
Ice Center, where two teams avoided their first
losses in the double - elimination Broome County High School Hockey Association playoffs.
An increasing body of research reveals that these weather events can be linked to
loss of sea
ice in the Arctic, said Charles Greene, professor of earth and atmospheric sciences
at Cornell University, who contributed to the article.
That corresponds to a roughly 3 1/2 week shift
at either end — and seven weeks of total
loss of good sea
ice habitat for polar bears — over the 35 years of Arctic sea
ice data.
In particular, the study noted volume
loss at the Totten and Moscow University
ice shelves, which help buttress a large section of the EAIS.
The work by Mark Jacobson, director of Stanford University's Atmosphere / Energy program and a fellow
at the university's Woods Institute, argues that cutting emissions of black carbon may be the fastest method to limit the ongoing
loss of
ice in the Arctic, which is warming twice as fast as the global average.
Since 2003 the GRACE satellites had measured
ice loss through variations in the earth's gravitation but only
at the fuzzy resolution of hundreds of kilometers.
«When we look forward several decades, climate models predict such profound
loss of Arctic sea
ice that there's little doubt this will negatively affect polar bears throughout much of their range, because of their critical dependence on sea
ice,» said Kristin Laidre, a researcher
at the University of Washington's Polar Science Center in Seattle and co-author of a study on projections of the global polar bear population.
Based on what we know, we can expect the rapid
ice loss to continue for a long time yet, especially if ocean - driven melting of the
ice shelf in front of Pine Island Glacier continues
at current rates,»
Researchers
at The Ohio State University and their colleagues have discovered that the same hotspot that feeds Iceland's active volcanoes has been causing them to underestimate
ice loss on Greenland.
In the case of Arctic whales, the changes in sea
ice might benefit their populations,
at least in the short term: the
loss and earlier retreat of sea
ice opens up new habitats and, in some areas of the Arctic, has also led to an increase in food production and the length of their feeding season.
«The
loss of this
ice shelf would be catastrophic,» says Ian Joughin, a glaciologist
at the University of Washington.
For short periods, it peaked
at ice loss rates of over 3000 cubic kilometres per year.»
Scientists are looking
at the link between the
loss of Arctic sea
ice and how it affects weather in lower latitudes, but more research is needed.
Jedediah Brodie, a scientist
at the University of British Columbia and study co-author, said a next step of research is determining which ecological changes in the Arctic are completely a result of
ice loss, as opposed to climate change factors such as temperature increases.
«If you haven't had proximity to these glaciers, if you haven't thought about where water comes from, it would be easy to understate or underestimate the implications of glacial
ice loss in a state that has predominantly a semi-desert climate and certainly by contemporary climate models is going to be pretty significantly impacted by climate change,» said Jacki Klancher, a professor of environmental science
at Central Wyoming College.
Dr Ian Joughin
at the University of Washington, author of a recent study simulating future Antarctic
ice sheet
losses added: «This study does a nice job of revealing the strong thinning along the Amundsen Coast, which is consistent with theory and models indicating this region is in the early stages of collapse.»
«I think this paper is novel in that we're presenting some of the first indirect effects of sea
ice loss for an Arctic whale species,» said lead author Donna Hauser, a postdoctoral researcher
at the UW's Polar Science Center and former doctoral student
at the School of Aquatic and Fishery Sciences.
Researchers in the Greenland GPS Network, led by Michael Bevis
at The Ohio State University, have discovered that the same hotspot that feeds Iceland's active volcanoes has been causing scientists to underestimate
ice loss on Greenland.
These findings suggest that Greenland's glaciers have been experiencing increasing
ice loss for
at least three decades — a result that may reinforce scientists» concerns over the stability of the melting
ice sheet.
«The traditional view of the
loss of land
ice on Earth has been that mountain glaciers and
ice caps are the dominant contributors, and
ice sheets are following behind,» said study co-author Eric Rignot, a glaciologist
at NASA's Jet Propulsion Laboratory and the University of California, Irvine.
At the end of this summer, only a quarter of the Arctic Ocean was still covered in
ice, a record low in modern times, and the total volume of
ice was just a fifth of what it was three decades ago (see «Record Arctic
ice loss»).
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.
«
At the same time, the mass
loss on the
ice sheet is not very large compared to how much mass they store.»
# 19 Gareth John Evans, Out of interest, the Arctic Oscillation / North Atlantic Oscillation (which are intrinsically linked) seem to have a key role in both the Arctic
ice loss (outflushing through the Fram Strait)-- Rigor / Wallace) and the Mediterranean drying e.g. Figen Mekik's post
at RC http://www.realclimate.org/index.php/archives/2007/10/sweatin-the-mediterranean-heat/
It is quite possible that we are well past half - way — maybe
at 75 % in terms of
loss of arctic sea
ice mass.
Since 1979, winter sea
ice extent has decreased 3.2 percent per decade (the
loss is much more pronounced in summer
at a rate of 13.4 percent per decade).
They could then plug that information into models to see how much
ice Greenland lost over the 20th century, as well as how that
loss varied over time and
at different points around the
ice sheet.
The information from the study helps improve scientists» understanding of the behavior of the
ice sheet and what processes control the
loss of
ice, Beata Csatho, a geophysicist
at the University of Buffalo in New York who was not involved with the work, said in a commentary published in the same issue of Nature.
This report describes simulations of future sea -
ice extent using the NCAR CCSM3, which point to the possible complete
loss of sea -
ice at the end of the melt season as soon as 2040.
Professor Konrad Steffen from the University of Colorado, speaking
at a press conference on Tuesday, highlighted new studies into
ice loss in Greenland, showing it has accelerated over the last decade.
Other researchers look
at raised beaches [32] and palaeo lakes to record previous rates of isostatic uplift and rates of sea level rise [33, 34]; this can help constrain previous
ice volumes and rates of
ice loss.
The findings also show that the
loss of
ice from calving has remained more or less constant through the 20th century, says Dr Ruth Mottram, a climate scientist
at the Danish Meteorological Institute who wasn't involved in the study.
Judah Cohen, a climate forecaster
at Atmospheric and Environmental Research in Massachusetts, who issues seasonal snowfall forecasts several months in advance for his company's clients, said the relationship between sea
ice loss and the Arctic Oscillation is a key area for future research to focus on.
One study, published in Proceedings of the National Academy of Sciences in January, hinted
at such a mechanism when it linked sea
ice decline to apparent changes in the Arctic Oscillation during several winters preceded by large sea
ice losses.
But from an email conversation with Francis, Vavrus, and several other atmospheric scientists this week, it became clear that there may be more questions than answers
at this point, given the large amount of natural variability that affects winter weather patterns, and the very short observational record of how the atmosphere responded to extreme
losses of sea
ice (only five winters of records since 2007).
One year without a net
loss also doesn't buck the long - term trend of Greenland losing
ice, both from surface melt and from ocean waters eating away
at glaciers that flow out to sea.
And given that much of this is related to the
loss of polar
ice, a changing climate would appear to be
at least partly — although perhaps not wholly — responsible.