Sentences with phrase «at glacial climate»

Not exact matches

Climate researchers from the Helmholtz Young Investigators Group ECUS at the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI) in Potsdam have now investigated how temperature variability changed as the Earth warmed from the last glacial period to the current interglacial period.

Because the brown cloud appears to be at least as important, eliminating it could buy time to implement more far - reaching solutions before catastrophic glacial melt and other climate change impacts occur, Ramanathan argues.

Glacial collapse is unprecedented in western Tibet, which for decades has resisted the effects of climate change while glaciers in southern and eastern Tibet have melted at an accelerating rate.

Using climate models to understand the physical processes that were at play during the glacial periods, the team were able to show that a gradual rise in CO2 strengthened the trade winds across Central America by inducing an El Nino - like warming pattern with stronger warming in the East Pacific than the Western Atlantic.

The results of our recent study suggest that the Atlantic water never ceased to flow into the Nordic Seas during the glacial period,» says Mohamed Ezat, PhD at Centre for Arctic Gas Hydrate, Environment and Climate (CAGE) at UiT, The Arctic University of Norway.

The results also have profound implications for present - day climate change, says Ólafur Ingólfsson, a glacial geologist at the University of Iceland in Reykjavik.

«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.

«We started from scratch and she wanted to know glacial cycles, rate of deforesting, solar variability — all of the issues that could impact climate and why I think that humans are the main driver of climate change,» he explained afterward at a debriefing with colleagues at a pub on Capitol Hill.

For the glacial period, comparisons to the Hulu Cave chronology demonstrated that WD2014 had an accuracy of better than 1 % of the age at three abrupt climate change events between 27 and 31ka.

Using Mg / Ca paleothermometry from the planktonic foraminifera Globigerinoides ruber from the past 500 k.y. at Ocean Drilling Program (ODP) Site 871 in the western Pacific warm pool, we estimate the tropical Pacific climate sensitivity parameter (λ) to be 0.94 — 1.06 °C (W m − 2) − 1, higher than that predicted by model simulations of the Last Glacial Maximum or by models of doubled greenhouse gas concentration forcing.

There is a new paper on Science Express that examines the constraints on climate sensitivity from looking at the last glacial maximum (LGM), around 21,000 years ago (Schmittner et al, 2011)(SEA).

There is a new paper on Science Express that examines the constraints on climate sensitivity from looking at the last glacial maximum (LGM), around 21,000 years ago (Schmittner et al, 2011)(SEA).

At the last glacial maximum (20,000 yrs ago), forcings by ice sheets, vegetation, greenhouse gases and dust loading are estimated to be around -7 W / m2, and that sustained a climate 5 to 6 degrees cooler than present.

Using Mg / Ca paleothermometry from the planktonic foraminifera Globigerinoides ruber from the past 500 k.y. at Ocean Drilling Program (ODP) Site 871 in the western Pacific warm pool, we estimate the tropical Pacific climate sensitivity parameter (λ) to be 0.94 — 1.06 °C (W m − 2) − 1, higher than that predicted by model simulations of the Last Glacial Maximum or by models of doubled greenhouse gas concentration forcing.

But it is far from obvious that the climate's sensitivity to GHG forcing must be the same today as it was at the glacial maximum, when conditions were very different.

There were two CLIMAP experiments to reconstruct past climates, one at the Last Glacial Maximum (LGM) 18,000 years ago when sea level was about 120 meters lower than today, and one at the Last Interglacial Maximum (LIM) 125,000 years ago when sea level was about 6 meters higher than today.

Only this past year I've come to understand we are at a climate high point, a sort of plateau, in the glacial - interglacial cycle.

Once the ice reaches the equator, the equilibrium climate is significantly colder than what would initiate melting at the equator, but if CO2 from geologic emissions build up (they would, but very slowly — geochemical processes provide a negative feedback by changing atmospheric CO2 in response to climate changes, but this is generally very slow, and thus can not prevent faster changes from faster external forcings) enough, it can initiate melting — what happens then is a runaway in the opposite direction (until the ice is completely gone — the extreme warmth and CO2 amount at that point, combined with left - over glacial debris available for chemical weathering, will draw CO2 out of the atmosphere, possibly allowing some ice to return).

Alarmed at the pace of change to our Earth caused by human - induced climate change, including accelerating melting and loss of ice from Greenland, the Himalayas and Antarctica, acidification of the world's oceans due to rising CO2 concentrations, increasingly intense tropical cyclones, more damaging and intense drought and floods, including glacial lakes outburst loods, in many regions and higher levels of sea - level rise than estimated just a few years ago, risks changing the face of the planet and threatening coastal cities, low lying areas, mountainous regions and vulnerable countries the world over,

Dr. Koppes is a glacial geomorphologist whose main interest these days is how glaciers respond to climate change; her co-author, David R. Montgomery of the University of Washington, is a geomorphologist, too, but a fluvial one — he comes at the subject from the river side.

A new research paper by Friedrich et al. looks at glacial - interglacial climate variability during the last 784,000 years to estimate Earth's climate variability.

Some other climate «scientists» also say that air bubbles trapped in glacial ice are reliable samples of air composition at the time the snow fell, even though it takes decades for the air to become trapped in the bubbles.

«In reality climate models have been tested on multicentennial time scales against paleoclimate data (see the most recent PMIP intercomparisons) and do reasonably well at simulating small Holocene climate variations, and even glacial - interglacial transitions.

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!)

In the natural cycle regarding long term natural climate change caused by Milankovitch cycles, at least for the past million years or so, the sensitivity response to changes is indicated to alter the global temperature by 6º Celsius between warm periods and glacial periods.

Speaking at an interaction programme on Glacial Lake Outburst Flood here, Minister Rijal underlined the increasing threat posed by Climate Change on the Himalayas and the natural heritage reflecting Nepal's unique identity.

Speaking this week at a conference on avoiding climate change hosted by the British government, Rapley warned that the melting of ice shelves which have been present since the last ice age may speed up glacial melt in a «cork out of bottle» effect.

The vulnerable nations declared that they are, «Alarmed at the pace of change to our Earth caused by human - induced climate change, including accelerating melting and loss of ice from Greenland, the Himalayas and Antarctica, acidification of the world's oceans due to rising CO2 concentrations, increasingly intense tropical cyclones, more damaging and intense drought and floods, including Glacial Lakes Outburst Floods, in many regions and higher levels of sea - level rise than estimated just a few years ago, risks changing the face of the planet and threatening coastal cities, low lying areas, mountainous regions and vulnerable countries the world over...»

The 25 D - O events during the last glacial, where temperatures rose and fell by 5 to 10 degrees C (10 - 15 degrees C for Greenland) within a span of decades that were «explained by internal variability of the climate system alone ``, deemed global in scale, and they occurred without any changes in CO2 concentrations, which stayed steady at about 180 ppm throughout the warming and cooling.

The use of the term «collapse,» which connotes an imminent calamity, rather than a long, relatively slow process (glaciers melting at, literally, a glacial pace) generated quite a bit of chatter in the climate journalism community, but in interviews, scientists defended the word as apt for this situation.

This case appears to be based on recent research taking two different approaches: looking at recent climate changes, and changes during the Last Glacial Maximum (LGM) about 20,000 years ago.

A catwalk of eco-innovation ideas and a children's workshop on glacial retreat were just some of the unusual activities on offer at the Climate Show 2018, held at Palexpo in Geneva from 6 to 8 April.

Andrey Ganopolski and Stefan Rahmstorf, «Simulation of rapid glacial climate changes in a coupled climate model,» Nature 409:153 - 158 (11 January 2001) at http://www.pik-potsdam.de/~stefan/.

Loss of glacial volume in Alaska and neighboring British Columbia, Canada, currently contributes 20 % to 30 % as much surplus freshwater to the oceans as does the Greenland Ice Sheet — about 40 to 70 gigatons per year, 66,78,63,57,64,58 comparable to 10 % of the annual discharge of the Mississippi River.79 Glaciers continue to respond to climate warming for years to decades after warming ceases, so ice loss is expected to continue, even if air temperatures were to remain at current levels.

Most important was a widely noted paper by Ewing and William Donn, who were «stimulated by the observation that the change in climate which occurred at the close of the [most recent] glacial period was extremely abrupt.»

The representation of the glacial ocean state and circulation in coupled climate simulations differs substantially between models and is often at odds with the geological evidence.

Knowing that abrupt and frequent climate changes attend the end extreme interglacials, and accepting your premise that CO2 can either cause warming by whatever process you propose, or ameliorate the drop to the glacial state, applying the Precautionary Principle absolutely requires that we avoid any possibility of climate back - sliding over the next, at least, 4,000 years:

Brian Anderson, a glaciologist at Wellington's Victoria University, said that the glacial retreat was undoubtedly caused by climate change.

Global connections between aeolian dust, climate and ocean biogeochemistry at the present day and at the last glacial maximum

Reuters: While the climate change discussion in Washington is moving at a glacial pace, nature is responding to climate change at record speed.

I think there must be at least two factors interacting to achieve the necessary switches so that they offset one another to minimise climate variability during interglacials but supplement one another to increase climate variability during glacial periods.

Maher, B.A. et al. (2010) Global connections between Aeolian dust, climate and ocean biogeochemistry at the present day and at the last glacial maximum.

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.

Peter Huybers and George Denton went on to show that the glacial - interglacial climate near the North Pole varies with the intensity of incoming solar radiation at those latitudes, while variations in Antarctic climate seem to be governed by changes in the duration of summer (Huybers and Denton, 2008).

In the past glacial cycles organisms and ecosystems responded to climate change by shifting geographical ranges and when unable to shift local populations died and at times entire species became extinct.

Observations of recent global warming, short - term cooling after major volcanic eruptions, cooling at the Last Glacial Maximum and other periods in the historical record, and the seasonal variation in climate, all provide some information which helps to determine the value of climate sensitivity.

The torrent from the glacial lake would have thundered into the North Atlantic, adding a vast freshwater «lid» on the ocean surface that could have rearranged ocean circulation and changed climate patterns, said Donnelly, who is a fellow of both the Ocean and Climate Change Institute and the Coastal Ocean Institute aclimate patterns, said Donnelly, who is a fellow of both the Ocean and Climate Change Institute and the Coastal Ocean Institute aClimate Change Institute and the Coastal Ocean Institute at WHOI.

«The Milankovitch theory of climate change proposes that glacial - interglacial cycles are driven by changes in summer insolation at high northern latitudes [i.e., solar irradiance received].

Such as another fascinating paper by Don J. Easterbrook, Professor Emeritus in the Deptment of Geology at Western Washington University: «Solar Influence on Recurring Global, Decadal, Climate Cycles Recorded by Glacial Fluctuations, Ice Cores, Sea Surface Temperatures, and Historic Measurements Over the Past Millennium» — Hat tip to Anthony Watt's Watts Up with That.

You say that the essentials of the climate sensitivity story can be boiled down to finding the single best - documented glacial - interglacial oscillation, at that so far that is the LGM (Last Glacial Maximum) to Holocene oscilglacial - interglacial oscillation, at that so far that is the LGM (Last Glacial Maximum) to Holocene oscilGlacial Maximum) to Holocene oscillation.