Sentences with phrase «when ice sheets»

When asked about the retreat of Alpine glaciers, he says, «What do they find when the ice sheets retreat, in the Alps?

AJ: We're not existentially concerned about what happens when ice sheets in currently temperate regions melt, but what happened as the Eemian approached peak.

But what caught my eye was a really interesting companion article, highlighting research on Roman seaside ruins which indicate that for the past two millennia or so that sea levels have been comparatively steady, and that the level of increase we witness today really started with industrialization.Though there's no doubt that sea levels around the globe have fluctuated widely, as in hundreds of foot differences — at the end of last ice age when ice sheets melted sea level rose almost 400 feet.

«The 14.7 ka b2k event followed Heinrich event H1 at a time when the ice sheets in the North were still extensive whereas the North was more deglaciated at 11.7 ka b2k (34), reducing the amount of ice discharge available to change the density of North Atlantic ocean waters and thereby the THC before the warming onset.»

However, when ice sheets (such as the Greenland Ice Sheet) melt, they release freshwater into the Atlantic.

Mercer based his statement on geologic evidence that West Antarctica's ice had changed considerably many, many millennia ago at times when the ice sheets of East Antarctica and Greenland had not

While sea level has varied greatly in the past, it has generally changed slowly, over many thousands of years — except when ice sheets collapse.

One example is that it appears that when the ice sheets build up in North America, it pulls the Atlantic High westward over the Eastern US.

Last glacial maximum was the period in the history of the planet when ice sheets covered significant part of the Northern hemisphere.

When ice sheets ceased their retreat, normal circulation resumed, leading to increased precipitation in southern Africa.

They do tend to occur in the coldest parts of the glacial cycles, when ice sheets extend out on to continental shelves.

The 800 year lag is irrelevant to the last 150 years or the MWP, LIA or any other relatively (compared to when ice sheets extended down to the A4 in England) small temperature shift.

During cooling periods, when ice sheets are expanding, ocean bottom water accumulates heavy oxygen isotopes (oxygen 18).

The Last Glacial Maximum is a period when ice sheets during the last northern hemisphere ice age were at their highest extent.

But, until recently, scientists have struggled to get a grasp of exactly what happens when ice sheets are put under «thermal stress».

When the ice sheets go, the glaciers which they buttress pick up speed.

When the ice sheets start progressive structural collapses we will see sea level rise events.

Further do we know from proxy records (corals) that the slow ice sheet feedback includes non-linear episodes, when ice sheets disintegrate and abruply cause SLR.

A smaller ice sheet extent might still respond with the observed high rate of sea level rise (5 m per century) if the warming is much more rapid than when ice sheets were more extensive.

During periods when ice sheets have been relatively stable, such as the last several millennia (the late Holocene), sub-millennial sea - level variability arose primarily from changes in atmosphere / ocean dynamics.

At the end of the last glacial maximum, when ice sheets reached their maximum extent 20,000 to 25,000 years ago, the ice covering Antarctica was even thicker than it is today.

They thrived when the ice sheets advanced, but suffered when temperatures rose.

Dr Ohneiser says that one of the key implications of the study is that changes in global sea - level are uneven when ice sheets expand or retreat.

When ice sheets melt and oceans heat up, the sea level rises.

When the ice sheets began melting about 15,000 years ago, they crossed into the New World as the first settlers.»

That blind spot comes at a time when ice sheets in West Antarctica and Greenland are changing more quickly than anyone expected.

It's known that when ice sheets start to melt, cooling the air in that region, the winds over the Southern Ocean strengthen, Toggweiler says.

They also found this discrepancy disappeared around 19,000 years ago, which is also when the ice sheets began to melt.

One way to assess the health of ice sheets is to look at their balance: when an ice sheet is in balance, the ice gained through snowfall equals the ice lost through melting and iceberg calving.

«Once you have that combination of ocean heat and atmospheric heat — which are related — that's when the ice sheet could really experience dramatic ice mass loss.»

Based on CO2 levels when the ice sheet formed, the researchers report that Antarctica's ice will be «dramatically» more vulnerable to melting once CO2 surpasses 600 parts per million in the atmosphere.

«Conversely, there is more and better evidence across Iceland that when the ice sheet underwent major reduction at the end of the last glacial period, there was a large increase in both the frequency and volume of basalt erupted — with some estimates being 30 times higher than the present day.

When the ice sheet -LSB-...]

This week, the institute announced that Greenland's ablation season, the period when its ice sheet loses more mass from melting along its edges than it does from snowfall in its interior, started on June 6.

We asked Tranter to speculate about the source of the microbes, and he suggested they may have reached their present home at least half a million years ago, when the ice sheet was much smaller.

When the ice sheet retracted from northern Europe following the last ice age around 23,000 years ago, new habitable areas emerged, allowing plants and animals to recolonize the Scandinavian peninsula.

They grow when the ice sheet gains mass through snowfall.

The edges of Greenland's 1.7 - million - km2 ice sheet regularly melt in summer, even in years when the ice sheet as a whole grows because of snowfall in its higher, colder center.

Not surprisingly, scientists are working hard to determine if and when the ice sheet will transition (or if it has already transitioned) from a stable state to a net mass loss state.

«Since most ice sheet erosion occurs at the margin of the ice sheet, that indicated times when the ice sheet retreated,» Cook said.

Not exact matches

But when you compare it to the 7.3 metres (24 feet) that global sea levels are predicted to rise if the entire Greenland Ice Sheet were to melt away all at once... well, it puts things into perspective.

-- On a lower speed, add eggs one at a time and vanilla until well incorporated — Increase mixing speed to high and let it go for 10 minutes — the mixture will become really pale and will almost double in size — In a medium sized bowl, whisk together flour, baking powder, baking soda, and salt — When 10 minutes are up, add flour mixture slowly until just combined, about 45 - 60 seconds — Chop up and mix together all of your baking and snack ingredients in a small bowl, and fold into batter with a spatula until just incorporated — Using a medium - sized ice cream scoop, portion cookie dough on parchment paper - lined cookie sheet and wrap the entire thing tightly with plastic wrap — Refrigerate for a minimum of 1 hour and up to 1 week — Heat oven to 400F and arrange cookies on cookie sheets at least 4 ″ apart — Bake 9 - 11 minutes, until they are golden in color and slightly brown along the edges — Cool the cookies completely on the sheet pan (or just eat them immediately...)

When your bread has doubled for the second time, remove the towel and quickly and simultaneously, slide the sheet tray with the baguettes onto the middle rack while carefully throwing the ice cubes into the bowl on the bottom rack.

Use ice cube and put them in the refrigerator or use wax papered cookie sheets when you freeze it.

How and when is fresh water added to the margins of ice sheets?

Nie and Garzione suggest that the fluctuating Antarctic ice sheet in the late Miocene, at a time when there was minimal ice in the Northern Hemisphere, exerted the dominant control on the 100,000 year cycles observed in the Qaidam Basin record.

When the team looked at the overall balance between the radiation upward from the surface of the ice sheet and the radiation both upward and downward from the upper levels of the atmosphere across all infrared wavelengths over the course of a year, they found that in central Antarctica the surface and lower atmosphere, against expectation, actually lose more energy to space if the air contains greenhouse gases, the researchers report online and in a forthcoming Geophysical Research Letters.

Tranter says he got the idea for Black and Bloom about four years ago, when he was working on the margins of the Greenland ice sheet and forgot his glacier goggles.

He claims the rocks move en masse, blown by winds when they are frozen into an ice sheet.

The last glacial maximum was about 18,000 years ago, when the Patagonian ice sheet expands to include about 10 meters [33 feet] of global sea level.