Sentences with phrase «of ice sheet growth»

Not exact matches

Ice - sheet growth, coupled with favorable changes in Earth's orbit, pushed the planet past a climatic tipping point and led to both the rapid buildup of a permanent ice sheet in the Antarctic and much larger changes in global climate, says HrIce - sheet growth, coupled with favorable changes in Earth's orbit, pushed the planet past a climatic tipping point and led to both the rapid buildup of a permanent ice sheet in the Antarctic and much larger changes in global climate, says Hrice sheet in the Antarctic and much larger changes in global climate, says Hren.

The researchers then used a computer model of Earth that simulated growth in the Antarctic ice sheet to see what geophysical impacts this would have aside from generally lowering the sea level.

We determine that this difference is driven by the growth and retreat of large continental ice sheets that are present in the cold ice - age climates; these ice sheets reflect a lot of sunlight and their growth consequently amplifies the impact of CO2 changes.»

Subtracting one from the other produced a «mass - balance» picture of net ice loss or growth for each ice sheet.

«Our findings suggest a significant link between ice sheet growth, the monsoon and the closing of the Panama Seaway, as North and South America drifted closer together.

The study, co-authored by Dr Thomas Stevens, from the Department of Geography at Royal Holloway, University of London, found a previously unknown mechanism by which the joining of North and South America changed the salinity of the Pacific Ocean and caused major ice sheet growth across the Northern Hemisphere.

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.

The abrupt changes seen in the Greenland ice cores are due to sea - ice changes and the slower changes are the growth or retreat of continental ice sheets.

The glaciation was favored by an interval when the Earth's orbit favored cool summers but Oxygen isotope ratio cycle marker changes were too large to be explained by Antarctic ice - sheet growth alone indicating an ice age of some size.

The abrupt changes seen in the Greenland ice cores are due to sea - ice changes and the slower changes are the growth or retreat of continental ice sheets.

More recent work has shown that the growth and collapse of the ice sheets is strongly tied to the insolation (Roe, 2006).»

Land - based ice in glaciers and ice - sheets will keep contributing to sea level rise as long as melting exceeds snowfall accumulation; stopping the growth of temperature would not stop the net melting.

If your model simulates the growth of ice sheets, then they will be a feedback.

Other forcings, including the growth and decay of massive Northern Hemisphere continental ice sheets, changes in atmospheric dust, and changes in the ocean circulation, are not likely to have the same kind of effect in a future warming scenario as they did at glacial times.

«Recent Ice - Sheet Growth in the Interior of Greenland» (Johannessen et al. 2005) http://www.sciencemag.org/cgi/content/abstract/310/5750/1013

Recent Ice - Sheet Growth in the Interior of Greenland.

(Much of the glaciological literature on termination of large ice ages requires ice - sheet growth past a threshold size.)

Ice age - An ice age or glacial period is characterized by a long - term reduction in the temperature of the Earth's climate, resulting in growth of continental ice sheets and mountain glaciers (glaciatioIce age - An ice age or glacial period is characterized by a long - term reduction in the temperature of the Earth's climate, resulting in growth of continental ice sheets and mountain glaciers (glaciatioice age or glacial period is characterized by a long - term reduction in the temperature of the Earth's climate, resulting in growth of continental ice sheets and mountain glaciers (glaciatioice sheets and mountain glaciers (glaciation).

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Repeated Pleistocene Epoch ice ages covered much of North America, Europe and Asia under mile - thick ice sheets that denuded continents, stunted plant growth, and dropped ocean levels 400 feet for thousands of years.

Simulating the variation of the ice sheet's albedo using a regional climate model — Modèle Atmosphérique Régionale (MAR), which some members of the team helped develop — indicated that increasing temperatures and melting accompanied by snow grain growth and greater bare ice exposure account for about half the decline, the scientists report.

When there is evidence for the growth of a large ice sheet on Antarctica or on Greenland or the growth of sea ice in the Arctic Ocean, we see evidence for a dramatic change in carbon dioxide levels over the last 20 million years.

We present an overview of the Eocene - Oligocene transition from a marine perspective and posit that growth of a continent - scale Antarctic ice sheet (25 × 106 km3) was a primary cause of a dramatic reorganization of ocean circulation and chemistry.

«Changes in the CO2 and CH4 content have played a significant part in the glacial - interglacial climate changes by amplifying, together with the growth and decay of the Northern Hemisphere ice sheets, the relatively weak orbital forcing»

The growth and decay of continental ice sheets represents a slow feedback operating over millennia; if one is concerned with the more rapid response of the climate to CO2, ice sheets have to be accounted for as a major forcing.

The biggest scientific contribution that Hansen and his colleagues make is an attempt to nail down a Moore's law (which models nonlinear rates of growth in computer chips) to ice sheets: Assuming non-linear processes have already begun, how fast will Greenland and Antarctica melt?

They analyzed the relationship between the growth of the algae and the amount of light being reflected by the ice sheet surface.

Precipitation: increased freshwater / iceberg flux cools ocean mixed layer, increases sea ice area, causing increase of precipitation that falls before it reaches Antarctica, adding to ocean surface freshening and reducing ice sheet growth.

A CO2 pulse in the atmosphere will take centuries to finally return to original levels, and that is completely ignoring any potential feedbacks from other parts of the system (ie temperatures raised for centuries could result in massve methane releases and loss of signficant low albedo ice sheets etc.) The experiments I am aware of that show improved plant growth in elevated CO2 levels require that all additional biological needs are amply provided for.

Scientists: Warming causes Antarctic ice sheet growth, and lower sea levels By Kenneth Richard While many scientists are projecting rapid sea level rise as a result of a warmer Antarctica and consequent ice sheet melting, other scientists are projecting that the surface of the Antarctic ice sheet will gain in mass because a warmer Antarctica means snow and ice accumulation will outpace the -LSB-...]

A lowering of atmospheric carbon dioxide levels near the beginning of this time period occurred in response to the rise of land plants and likely cooled Earth, but the rapid growth of extensive Gondwanan ice sheets was delayed for tens of millions of years, until the Late Mississippian.»

If the ice - sheet bed deepens toward the center of the ice sheet, an instability exists, such that in the absence of additional stabilizers, the grounding line will advance with ice - sheet growth, or retreat with ice - sheet shrinkage, to a position where the bed rises towards the ice - sheet center.

The Cenozoic record also reveals the amplification of climate change that occurs with growth or decay of ice sheets, as is apparent at about 34 Myr BP when the Earth became cool enough for large - scale glaciation of Antarctica and in the most recent 3 — 5 Myr with the growth of Northern Hemisphere ice sheets.

The slowly changing orbit and tilt of the spin axis affect the seasonal distribution of insolation [27], and thus the growth and decay of ice sheets, as proposed by Milankovitch [28].

The remaining slow drift to lower GMT and pCO2 over glacial time, punctuated by higher - frequency variability and the dust − climate feedbacks, may reflect the consequences of the growth of continental ice sheets via albedo increases (also from vegetation changes) and increased CO2 dissolution in the ocean from cooling.

More elaborate and accurate approaches, including use of models, will surely be devised, but comparison of our result with other approaches is instructive regarding basic issues such as the vulnerability of today's ice sheets to near - term global warming and the magnitude of hysteresis effects in ice sheet growth and decay.

Actually, what the isotopes tell us is that there was an increase in the amount of biological carbon through the deglaciation, not a decrease, about 500 Gton C as organic matter, explainable as growth of forests where the ice sheets used to be.

Peter Weyl hypothesized in 1968 that the closure of the Central American Seaway and the intensification of the Gulf Stream would have brought a critical ingredient for ice sheet growth to the Northern Hemisphere — moisture.

Weyl's theory assumed that the closure of the Central American Seaway and the buildup of salt in the Atlantic coincided with the growth of northern ice sheets between 3.1 and 2.7 million years ago.

There has been no reduction in the surface area of grounded ice in the Greenland and Antarctic Ice Sheets, although the mass appears to have declined recently, at least in Greenland, if we can believe the GRACE results, which show more mass loss than earlier satellite altimetry measurements by Johannessen / Zwally (GRL) and Davis / Wingham (Antarctica), which showed net growth over the period 1993 - 20ice in the Greenland and Antarctic Ice Sheets, although the mass appears to have declined recently, at least in Greenland, if we can believe the GRACE results, which show more mass loss than earlier satellite altimetry measurements by Johannessen / Zwally (GRL) and Davis / Wingham (Antarctica), which showed net growth over the period 1993 - 20Ice Sheets, although the mass appears to have declined recently, at least in Greenland, if we can believe the GRACE results, which show more mass loss than earlier satellite altimetry measurements by Johannessen / Zwally (GRL) and Davis / Wingham (Antarctica), which showed net growth over the period 1993 - 2003.

A prerequisite was the growth of very large Northern Hemisphere ice sheets, whose subsequent collapse created stadial conditions that disrupted global patterns of ocean and atmospheric circulation.