Sentences with phrase «when global sea ice»

More importantly, will the logic you use to reach those conclusions hold when global sea ice once again drops way down?

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.

Scientists from Rice University and Texas A&M University - Corpus Christi's Harte Research Institute for Gulf of Mexico Studies have discovered that Earth's sea level did not rise steadily but rather in sharp, punctuated bursts when the planet's glaciers melted during the period of global warming at the close of the last ice age.

Due to global warming, larger and larger areas of sea ice melt in the summer and when sea ice freezes over in the winter it is thinner and more reduced.

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.

Conversely, when there is less Arctic sea ice, the ocean absorbs more heat from the sun, adding to global warming.

«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.

When the planet's big ice sheets collapsed at the end of the last ice age, their melting caused global sea levels to rise as much as 100 meters in roughly 10,000 years, which is fast in geological time, Mann noted.

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 you're talking about global warming and melting ice caps, as everyone seems to be, a five - millimeter adjustment in the modeled diameter of the Earth could be the difference between sea levels appearing to rise from any given year to the next and then appearing to drop.

If proxy data can confirm that sea ice was indeed the major player in past abrupt climate - change events, it seems less likely that such dramatic abrupt changes will occur due to global warming, when extensive sea - ice cover will not be present.

When these ice shelves suddenly splinter and weaken or even collapse entirely, as has been observed in Antarctica, the glaciers that feed them speed up, dumping more ice into the ocean and raising global sea levels.

While this process is a natural part of the life cycle of an ice shelf, there is concern that when it occurs, it could usher in a period of irrevocable retreat and possibly lead to the ice shelf's demise and further contributions to global sea level rise.

If proxy data can confirm that sea ice was indeed the major player in past abrupt climate - change events, it seems less likely that such dramatic abrupt changes will occur due to global warming, when extensive sea - ice cover will not be present.

Our modelled values are consistent with current rates of Antarctic ice loss and sea - level rise, and imply that accelerated mass loss from marine - based portions of Antarctic ice sheets may ensue when an increase in global mean air temperature of only 1.4 - 2.0 deg.

Why is that we see a reccord high sea ice level in the Antarktic area when global temperature is rising.

At a time when melting polar sea ice is causing so many to focus on which political power will place its flag over the Arctic, controlling the Northwest Passage shipping lanes and the petroleum resources beneath the sea ice, Miami artist Xavier Cortada has developed a project that engages people across the world below to plant a green flag and native tree to help address global climate change.

When confronted with a contrarian who argues that somehow global warming isn't taking place, I would point to the Arctic sea ice and glaciers — which have even lasted through the warm periods of the past two thousand years — and probably well before.

The study starts with observations of eroding ice sheets spreading, cooler freshwater at both ends of the planet and geological hints of tempestuous conditions toward the end of the Eemian, that last interval between ice ages when global temperatures and seas were higher than now.

I can't wait for the explanations when that happens — as in that movie «The Day After,» in which it is revealed that global warming actually leads to an ice age because the Gulf Stream gets re-routed and no longer warms the North Sea.

Re 9 wili — I know of a paper suggesting, as I recall, that enhanced «backradiation» (downward radiation reaching the surface emitted by the air / clouds) contributed more to Arctic amplification specifically in the cold part of the year (just to be clear, backradiation should generally increase with any warming (aside from greenhouse feedbacks) and more so with a warming due to an increase in the greenhouse effect (including feedbacks like water vapor and, if positive, clouds, though regional changes in water vapor and clouds can go against the global trend); otherwise it was always my understanding that the albedo feedback was key (while sea ice decreases so far have been more a summer phenomenon (when it would be warmer to begin with), the heat capacity of the sea prevents much temperature response, but there is a greater build up of heat from the albedo feedback, and this is released in the cold part of the year when ice forms later or would have formed or would have been thicker; the seasonal effect of reduced winter snow cover decreasing at those latitudes which still recieve sunlight in the winter would not be so delayed).

So to you, when Dr. Maslowski said, «My claim is that the global climate models underestimate the amount of heat delivered to the sea ice by oceanic advection,» You think that he means a few outlier models instead of the main bulk of modeled knowledge?

Claire Parkinson, now a senior climate change scientist at NASA, first began studying global warming's impact on Arctic sea ice in 1978, when she was a promising new researcher at the National Center for Atmospheric Research.

«At the end of the last ice age around 11,000 years ago, the ice sheet went through a period of rapid, sustained ice loss when changes in global weather patterns and rising sea levels pushed warm water closer to the ice sheet — just as is happening today,» NASA said.

Sea level rise is caused by the melting of polar ice caps and the expansion of water when it is warmed, both triggered by global warming.

When sceptics look at statistical data, whether it is recent ice melt, deep sea temperatures, current trend in global surface temperatures, troposphere temperatures, ice core records etc. they look at the data as it is without any pre-conceptions and describe what it says.

But his trip was a few decades ago when the average sea ice depth was 3.1 meters; now it is down to 1.7 meters and models suggest that it will continue thinning and retreating with our global warming.

... yeah, it looks like catastrophic global warming began May 23, 1850 when the USS Advance put to sea from New York to search for John Franklin's Arctic expedition which as it turned out was locked in the ice years earlier, in a search of the North - West Passage.

Nothing has changed when it comes to climate sensitivity, to the temperature record, to the physics of the greenhouse effect, to the energy budget, to the Arctic sea ice, the melting permafrost in Siberia and all the other effects of global warming.

That winter was also to be the coldest in the UK since 1978/79, when climate scientists were still scaring us with stories about imminent global cooling and satellites were only just starting to measure the temperature of the lower troposphere and the beginnings of the «catastrophic» decline in Arctic sea - ice.

Global warming may not affect sea levels, study finds — January 11, 2008 Excerpt: Excerpt: The most pessimistic predictions of sea level rises as ice sheets are melted by global warming may have to be scaled back as a result of an extraordinary discovery that ice persisted when the Earth was much hotter than Global warming may not affect sea levels, study finds — January 11, 2008 Excerpt: Excerpt: The most pessimistic predictions of sea level rises as ice sheets are melted by global warming may have to be scaled back as a result of an extraordinary discovery that ice persisted when the Earth was much hotter than global warming may have to be scaled back as a result of an extraordinary discovery that ice persisted when the Earth was much hotter than today.

That carbon dioxide obviously was utterly irrelevant in the massive global warming every 100,000 years at the beginning of interglacials when sea levels rose 300ft plus as gazillion tons of ice melted?

Declining Arctic sea ice reached a milestone in the summer of 1998 when the ice pulled back completely from the Arctic coasts of Alaska and Canada, opening up the Northwest passage through which the diatom may have passed, Reid and colleagues write in their report of the diatom's return published in the journal Global Change Biology in 2007.

Of course this should come as no surprise when the alarmies ascribe the [recent] record cold temperatures, severe winters and growing Antarctic ice cap and sea ice as due to global warming.

If — or more likely when — Thwaites and its neighbour, the Pine Island glacier, ultimately lose all their ice, one estimate suggests that could raise global sea levels by about 3.4 m, enough to affect every coastal city on Earth.

«Global Sea ice trend by year only (barely) crosses 95 % significance when the first two months of satellite data is included for the entire record.»

Knowing what is driving ice - shelf melt is important because when ice shelves lose mass, they speed up the flow of land - bound glaciers that feed them, moving ice from the continent to the ocean, and contributing to global sea level rise.

The last time in Earth history when the global average surface temperature was as warm as the IPCC projects for 2100 in its mid-range scenarios, there was very little polar ice and sea level would have been roughly 70 meters (over 200 feet) higher than at present.

They believe those who work for the government when they say, «we have modeled your future;» and, then the people don't understand when they learn that the, Global warming computer models are confounded as Antarctic... (It's unprecedented: across the globe, there are about one million square kilometers more sea ice than 35 years ago, which is when satellite measurements began).

RE: 4th Error -RCB- Poses an objection to the non-scientific term catastrophic [NOTE: Scientific «consensus» is often being used & / or implied in standard climate - change discourse - Yet Consensus is a Political Term - NOT a Scientific Term]- HOWEVER - When Jim Hansen, the IPCC & Al Gore, et - al - go from predicting 450 — 500 ppm CO2 to 800 — 1000ppm by the end of the 21st century -LCB- said to the be highest atmospheric CO2 content in 20 — 30 Million YRS -RCB-; — & estimates for aver global temps by 21st century's end go from 2 * C to 6 * C to 10 * C; — & increased sea level estimates go from 10 - 20 cm to 50 - 60 cm to 1M — 2M -LCB- which would totally submerge the Maldives & partially so Bangladesh -RCB-; — predictions of the total melting of the Himalayan Ice caps by 2050, near total melting of Greenland's ice sheet & partial melting of Antarctica's ice sheet before the 21st century's end; — massive crop failures; — more intense & frequent hurricane -LCB- ala Katrina -RCB- for much longer seasonal durations, etc, etc, etc... — IMO That's Sounds pretty damned CATASTROPHIC to Ice caps by 2050, near total melting of Greenland's ice sheet & partial melting of Antarctica's ice sheet before the 21st century's end; — massive crop failures; — more intense & frequent hurricane -LCB- ala Katrina -RCB- for much longer seasonal durations, etc, etc, etc... — IMO That's Sounds pretty damned CATASTROPHIC to ice sheet & partial melting of Antarctica's ice sheet before the 21st century's end; — massive crop failures; — more intense & frequent hurricane -LCB- ala Katrina -RCB- for much longer seasonal durations, etc, etc, etc... — IMO That's Sounds pretty damned CATASTROPHIC to ice sheet before the 21st century's end; — massive crop failures; — more intense & frequent hurricane -LCB- ala Katrina -RCB- for much longer seasonal durations, etc, etc, etc... — IMO That's Sounds pretty damned CATASTROPHIC to ME!

Despite the stability of those ice sheets in the Holocene, there is evidence that sea level was much more variable during the Eemian, when we estimate the peak global temperature was only +1.0 °C warmer than in the first decade of the twenty - first century.

There is enough ice to, when melted completely, raise global sea levels with roughly 58 m.

As opposed to a glaciers or ice sheets, which are found on land, floating ice shelves don't raise global sea levels appreciably when they break off into the ocean and melt.

When you think in terms of decades or centuries, the most vulnerable part of the West Antarctic Ice Sheet could raise global sea levels as much as 3 meters, Rignot told me.

When land ice melts and flows into the oceans global sea levels rise on average; when sea ice melts sea levels do not change measuraWhen land ice melts and flows into the oceans global sea levels rise on average; when sea ice melts sea levels do not change measurawhen sea ice melts sea levels do not change measurably.

Ice shelves do not raise sea level when they melt, but do seem to accelerate the flow of land - bound ice into the sea — one of the «unknowns» of global warmiIce shelves do not raise sea level when they melt, but do seem to accelerate the flow of land - bound ice into the sea — one of the «unknowns» of global warmiice into the sea — one of the «unknowns» of global warming.

When I started looking at this topic the first thing that struck me was just how much time is spent in the blogosphere debating the effects (real or imagined) of global temperature rise and how little time seemed to be spent on the key evidential science; as though retreating glaciers, arctic sea - ice or coral bleaching said anything about causality.

What does «average global sea - level rise» mean, and what are the global and regional consequences when all the ice melts on the far - away West Antarctic Ice Sheice melts on the far - away West Antarctic Ice SheIce Sheet?

The assumption that the rate of change of sea level rise from those components that were small during the 20th century and which have been attributed to ice sheets would scale with global temperature change leads to a strong and unlimited amplification of future sea level rise when global temperatures continue to increase.

To sum up, recent global temperatures, weather, polar ice and sea levels are consistent with our knowledge of corresponding Holocene climate variability measures when man was not a factor to be considered.