Comment: Radiocarbon deglaciation chronology of the Thunder Bay, Ontario area and implications
for ice sheet retreat patterns
Not exact matches
The reason
for the
retreat of the
ice sheets remains elusive, however.
The revised estimate
for sea - level rise comes from including new processes in the 3 - dimensional
ice sheet model, and testing them against past episodes of high sea - levels and
ice retreat.
Marine geologist Karin Andreassen at CAGE, the study's lead author, says the data could hold lessons
for retreating ice sheets in West Antarctica and Greenland, although her team could not determine how much methane actually escaped into the atmosphere from blowouts in the distant past.
THE MOTIVE
For millions of years, Antarctica's
ice sheet has advanced and
retreated as Earth has cooled and warmed.
«These glaciers will keep
retreating for decades and even centuries to come and we can't stop it,» said lead study author Eric Rignot, a glaciologist at the University of California, Irvine, and NASA's Jet Propulsion Laboratory in Pasadena, Calif. «A large sector of the West Antarctic
Ice Sheet has passed the point of no return.»
To track the growth and
retreat of
ice cover in the region, Miller and colleagues have been hunting
for remnants of scraggly mosses along the edges of the island's
retreating ice sheets.
Thomas, R.H., and C.R. Bentley, A model
for Holocene
retreat of the West Antarctic
ice sheet, Quaternary Research, Vol.
The rapid shrinkage of glaciers around the Antarctic Peninsula, coupled with the potential
for ice - shelf collapse and grounding line retreat, raises concerns for the future of the West Antarctic Ice Sheet, and this is an area of urgent current research [
ice - shelf collapse and grounding line
retreat, raises concerns
for the future of the West Antarctic
Ice Sheet, and this is an area of urgent current research [
Ice Sheet, and this is an area of urgent current research [3].
Our interactions with climate,
for far more than 99 percent of history, ran in one direction: Precipitation or temperatures changed,
ice sheets or coastlines or deserts advanced or
retreated, and communities thrived, suffered, or adjusted how or where they lived.
The
retreat sequence along the eastern margin of the Laurentide
Ice Sheet is especially relevant
for understanding climate variability.
«A Model
for Holocene
Retreat of the West Antarctic
Ice Sheet.»
Air pressure changes, allergies increase, Alps melting, anxiety, aggressive polar bears, algal blooms, Asthma, avalanches, billions of deaths, blackbirds stop singing, blizzards, blue mussels return, boredom, budget increases, building season extension, bushfires, business opportunities, business risks, butterflies move north, cannibalistic polar bears, cardiac arrest, Cholera, civil unrest, cloud increase, cloud stripping, methane emissions from plants, cold spells (Australia), computer models, conferences, coral bleaching, coral reefs grow, coral reefs shrink, cold spells, crumbling roads, buildings and sewage systems, damages equivalent to $ 200 billion, Dengue hemorrhagic fever, dermatitis, desert advance, desert life threatened, desert
retreat, destruction of the environment, diarrhoea, disappearance of coastal cities, disaster
for wine industry (US), Dolomites collapse, drought, drowning people, drowning polar bears, ducks and geese decline, dust bowl in the corn belt, early spring, earlier pollen season, earthquakes, Earth light dimming, Earth slowing down, Earth spinning out of control, Earth wobbling, El Nià ± o intensification, erosion, emerging infections, encephalitis,, Everest shrinking, evolution accelerating, expansion of university climate groups, extinctions (ladybirds, pandas, pikas, polar bears, gorillas, whales, frogs, toads, turtles, orang - utan, elephants, tigers, plants, salmon, trout, wild flowers, woodlice, penguins, a million species, half of all animal and plant species), experts muzzled, extreme changes to California, famine, farmers go under, figurehead sacked, fish catches drop, fish catches rise, fish stocks decline, five million illnesses, floods, Florida economic decline, food poisoning, footpath erosion, forest decline, forest expansion, frosts, fungi invasion, Garden of Eden wilts, glacial
retreat, glacial growth, global cooling, glowing clouds, Gore omnipresence, Great Lakes drop, greening of the North, Gulf Stream failure, Hantavirus pulmonary syndrome, harvest increase, harvest shrinkage, hay fever epidemic, heat waves, hibernation ends too soon, hibernation ends too late, human fertility reduced, human health improvement, hurricanes, hydropower problems, hyperthermia deaths,
ice sheet growth,
ice sheet shrinkage, inclement weather, Inuit displacement, insurance premium rises, invasion of midges, islands sinking, itchier poison ivy, jellyfish explosion, Kew Gardens taxed, krill decline, landslides, landslides of
ice at 140 mph, lawsuits increase, lawyers» income increased (surprise surprise!)
Recent work has suggested that rapid
retreat is already underway
for sections of the West Antarctic
ice sheet, raising the possibility of increasing contributions to sea - level rise.
The
retreat of glaciers and shrinking of the Greenland
ice sheet in the Arctic,
for example, is predicted to cause significant sea - level rise, changes in the salinity of our oceans, and altered feedback loops that will make the Arctic warm up even faster.
The evidence
for rapid climate change is compelling: Sea level rise, Global temperature rise, Warming oceans, Shrinking
ice sheets, Declining Arctic sea
ice, Glacial
retreat, Extreme events, Ocean acidification, Decreased snow cover http://climate.nasa.gov/evidence/ It's changing «rapidly».
Methane was seeping from the seafloor
for thousands of years following the
retreat of the Barents Sea
ice sheet, shows a groundbreaking new study in Nature Communications.
It was the cold, dry
ice ages that created frigid deserts, life - smothering
ice sheets,
retreating oceans and massive losses
for all life forms.
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.)
«We're providing mechanistic explanations
for how those dramatic sorts of rates of
ice sheet retreat could actually happen,» DeConto told me, «but we don't need [Hansen's] feedback [to reach similar conclusions.]»
You are also comparing
ice sheets and glaciers by the way, but it does not much change your argument except
for the relevance of rate of
retreat comparison.
It will also confirm the accelerated rate of change
for impacts such as sea - level rise, the steady
retreat of Arctic sea
ice and quickened melting of
ice sheets and glaciers, as well as offer more detail on scenarios that will shape international negotiations over both short - term and long - term greenhouse gas emissions, including how long «business as usual» can be sustained without dangerous risk.
Donald D. Blankenship, a senior researcher at UT's Institute
for Geophysics (UTIG) and one of the authors of the study, explained that understanding the evolution of the
ice sheet over the East Antarctic landscape as well as its points of vulnerabilities
for rapid
retreat allows them to predict what could potentially happen to the region in the coming years.
Scientists from the Center
for Arctic Gas Hydrate (CAGE), Environment and Climate at the Arctic University of Norway, published a study in June 2017, describing over a hundred ocean sediment craters, some 3,000 meters wide and up to 300 meters deep, formed due to explosive eruptions, attributed to destabilizing methane hydrates, following
ice -
sheet retreat during the last glacial period, around 12,000 years ago, a few centuries after the Bølling - Allerød warming.
The radar readings from both teams show that the grounding line
for some areas of the West Antarctic
Ice Sheet has
retreated by as much as 20 miles (37 kilometers) over the past couple of decades, apparently due to the interaction with warmer seas.
A finding which is supported by a just - published paper showing the polar
ice sheets are
retreating in a synchronous manner
for the first time, which puts the current warming into context.
The
retreat of a massive
ice sheet that once covered much of northern Europe has been described
for the first time, and researchers believe it may provide a sneak preview of how present - day
ice sheets in Greenland and Antarctica will act in the face of global warming.