Sentences with phrase «during warm interglacial»

Historically, methane concentrations in the world's atmosphere have ranged between 300 and 400 nmol / mol during glacial periods commonly known as ice ages, and between 600 to 700 nmol / mol during the warm interglacial periods.

For example, the polar bear specimen from roughly 120,000 years ago survived in Svalbard during a warm interglacial period because that Arctic archipelago remained more frozen than other areas.

Many of the glaciers that jut out into the ocean are thinning, but whether the ice sheet itself has remained stable and intact, even during warm interglacial periods, is a matter of considerable debate.

Previous estimates suggested that peak temperatures during the warmest interglacial periods — which occurred at around 125,000, 240,000 and 340,000 years ago — were about three degrees higher than they are today.

Before the industrial revolution, the natural level of atmospheric CO ₂ during warm interglacials was around 280 ppm.

However, we know that severe and abrupt climate shifts of global extent have occurred (infrequently) during glaciations, and almost never during warmer interglacial periods such as the current Holocene.

Even during warm interglacials coral battled cold temperatures dips.

Increased surface melting, loss of ice shelves, and reduction of summer and autumn sea ice around the Antarctic and Greenland continents during the warmest interglacials would have a year - round effect on temperature, because the increased area of open water has its largest impact on surface air temperature in the cool seasons.

Not exact matches

Researchers from the Niels Bohr Institute have analysed the natural climate variations over the last 12,000 years, during which we have had a warm interglacial period and they have looked back 5 million years to see the major features of the Earth's climate.

Then they lugged them back to Ohio to begin independent study (IS) projects on characterizing the change in sea levels during the last interglacial warming period.

Instead, the fossil record indicates they vanished during the Earth's glacial - interglacial transition, which occurred about 12,000 years ago and led to much warmer conditions and the start of the current Holocene period.

During «interglacials», the temperature was somewhat warmer and the ice retreated.

During the last 800,000 years, CO2 fluctuated between about 180 ppm during ice ages and 280 ppm during interglacial warm peDuring the last 800,000 years, CO2 fluctuated between about 180 ppm during ice ages and 280 ppm during interglacial warm peduring ice ages and 280 ppm during interglacial warm peduring interglacial warm periods.

The fact that ice sheets will respond to warming is not in doubt (note the 4 - 6 m sea level rise during the last interglacial), but the speed at which that might happen is highly uncertain, though the other story this week shows it is ongoing.

No one says that there is anything mysterious about the relationship between raised CO2 levels and warming / cooling during glacial / interglacial cycles.

This is because warmer conditions during interglacials encouraged the collapse of ice shelves.

The sequence of climatic forcings and responses during deglaciations (transitions from full glacial conditions to warm interglacials) are well documented.

This article will use the term ice age in the former, glaciological, sense: glacials for colder periods during ice ages and interglacials for the warmer periods.

Recent instrumental data spans 165 + years during the past 11,000 + years of the Holocene interglacial warm period as shown on figure 2.

David B. Benson says: «Somehow the climate survived during the Eemian interglacial despite global temperatures about 2 K warmer than even now.»

The difference between the last glacial maximum (20,000 yrs ago) and today is about 120 meters (400 ft), but the high levels during some of the warmest interglacials were 6 - 9 meters (20 to 30 feet) higher than today.

[Response: If this reservoir existed and was so poised to release methane as you speculate, then it would have done something during warmer conditions early in the Holocene, or in the last interglacial.

You said: «If this reservoir existed and was so poised to release methane as you speculate, then it would have done something during warmer conditions early in the Holocene, or in the last interglacial.

--- What is of concern is what happens when the waters warm at even greater depths, waters not warmed enough to release during prior interglacials, where there are (presumably) vast quantities of methyl clathrates.

That might well be called nature's global warming because what happens during an interglacial period is the Earth warms up, the glaciers melt and life flourishes.

The explanation is global warming and climate changes are now occurring 200 times faster than during the much slower, Pleistocene interglacial warming events.

During the previous interglacial, the Eemian, temperatures were about 2 K warmer than now and the sea highstand was 4 — 6 meters higher than the current level, depending upon location measured.

Wilmot McCutchen (26)-- We also know that during the previous interglacial, the Eemian, that global temperatures were about 2 K warmer than «at present», i.e., 1950s, and during that time considerable melt occurred in Greenland (and probably some of WAIS), resulting in a 4 — 6 m sea highstand (different in different locations).

However, although the Arctic is still not as warm as it was during the Eemian interglacial 125,000 years ago [e.g., Andersen et al., 2004], the present rate of sea ice loss will likely push the system out of this natural envelope within a century.

The new results... show that the climate in Greenland was around 8 degrees C. [14.4 degrees F.] warmer than today during the last interglacial period, the Eemian period, 130,000 to 115,000 thousand years ago.

Why should warming during the current Holocene Interglacial be significantly different / less than during the previous Eemian Interglacial (MIS5e), when sea levels were, per the IPCC's own comments, above modern levels or for that matter above the purported mid-Holocene highstand?

I look at the transitions from glacial to interglacial and see that warming is extremely rapid, overshoots by a bit, then never again exceeds the initial overshoot during the rest of the interglacial period.

The 12 — 21 cm higher sea level stand during the MWP is likely the highest sea level since the previous interglacial period 110,000 years ago, and was produced by an extended period of warming, allowing time for glaciers and thermal expansion to reach a climatic balance.

It seems likely to me that the level warming we have had in many periods of this interglacial period are likely to occur again in the future centuries: And it seems during most the current of the interglacial temperatures have as warm or warmer than current temperatures, therefore it seems as warmer or warmer is most likely.

The planet went from interglacial warm to glacial cold during the Younger Dryas period with cooling for around 1000 years.

For example, atmospheric carbon dioxide grew by approximately 30 % during the transition from the most recent cold glacial period, about 20,000 years ago, to the current warm interglacial period; the corresponding rate of decrease in surface ocean pH, driven by geological processes, was approximately 50 times slower than the current rate driven largely by fossil fuel burning.

During the Eemian (the interglacial before this one about 100,000 or so years ago) sea level was about 9 meters higher than now, presumably because the Earth was warmer than now and there was then enough water.

During this period, global temperatures were 1.5 - 2.0 °C warmer than the peak warmth of the present interglacial, or Holocene, in which we are now living.

It is not accidental that human development has occurred primarily during the current (warmer) interglacial period.

And in terms of our current interglacial period, there has much warmer periods during this time, and that the long trend over 8000 year period has been a slight cooling.

Both panels are reconstructions of oxygen concentrations in the California Margin during a cold, glacial climate (left, 18,000 years ago) and a warm, interglacial climate (right, 14,000 years ago; Moffitt et al. 2015a).

If we have real - world evidence that temperatures were warmer than today during most of the past 10,000 years (and also during several interglacial warm periods during the past few million years), and if we also have real - world evidence that human civilization thrived during these warmer temperatures and the warmer temperatures did not trigger so - called «tipping points» sending the planet into a climate catastrophe, then we have very little reason to believe that our presently and moderately warming temperatures are now poised to send the planet into a climate catastrophe.

We are undeniably in an interglacial period, during which the planet warms.

Study «finds Greenland was resistant to melting during last interglacial, despite temps much warmer than present.

Matthiessen, J. & Knies, J. Dinoflagellate cyst evidence for warm interglacial conditions at the northern Barents Sea margin during marine oxygen isotope stage 5.

Based on the empirical evidence of the laboratory experiments, it is quite possible that the increasing CO2 in the atmosphere during interglacial periods could have amplified the warming already occurring.

Basically, my comment is that it's no surprise that there was ice melt during the height of the warming during this interglacial.

Warm Greenland during the last interglacial: the role of regional changes in sea ice cover.

Even if it has been warmer at times during the current and previous interglacials, showing that the forcing is unprecedented, rising and currently overwhelming natural variation can be seen of itself to be sufficient cause for alarm (that it be overwhelming is not quite what the IPCC report states but the more than half post 1950 claim is similar).

http://www.nbi.ku.dk/english/news/news13/greenland-ice-cores-reveal-warm-climate-of-the-past/ «The new results from the NEEM ice core drilling project in northwest Greenland, led by the Niels Bohr Institute at the University of Copenhagen show that the climate in Greenland was around 8 degrees C warmer than today during the last interglacial period, the Eemian period, 130,000 to 115,000 thousand years ago.»