Sentences with phrase «many glacial cycles»

Dr. Huybers» research involves the causes of glacial cycles, evaluation of modern climate extremes, and the implications of climate change for food production.

«Recurrent glacial cycles have probably selected for a highly mobile arctic flora,» the researchers report in Science.

Bay mud consists of thick deposits of soft, unconsolidated silty clay, which is saturated with water; these soil layers are situated at the bottom of certain estuaries, which are normally in temperate regions that have experienced cyclical glacial cycles.

But for the other half of the picture — what happened in the oceans during that time — there is only a relatively short record extending back about 20,000 years to the last glacial cycle.

«Ancient Indonesian climate shift linked to glacial cycle.»

The next step for Russell and his colleagues is to see if this pattern is repeated in multiple glacial cycles.

The analysis provides a window into how animals might react to any kind of climate change, whether glacial cycles or global warming.

The timing of this decline correlates with environmental changes associated with the onset of the last glacial cycle, the team reports, whereas archaeological evidence does not support the presence of large populations of humans in eastern Beringia until more than 15,000 years later.

There's never been a study that has comprehensively analyzed whether vertebrate communities responded to the glacial cycles in a uniform way.»

Building on this study, the team intend to produce a new reconstruction of global ice volume across the last glacial cycle, which will help to validate their proposition that certain boundaries can define windows of instability within the climate system.

«The first step was to reconstruct the history of global mean temperatures for the last 784,000 years, using combined data from marine sediment cores, ice cores, and computer simulations covering the last eight glacial cycles,» said Friedrich, a post-doctoral researcher at IPRC.

«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.

The research team also assessed whether climate sensitivity was different in warmer times, like the Pliocene, than in colder times, like the glacial cycles of the last 800,000 years.

Climate scientists have long suspected that these glacial cycles are triggered by changes in our planet's orbit.

Having briefly glanced at it, his main argument seems to come from overlaying the CO2 records at the same stage of different glacial cycles, and that seems quite hard to do, to me — William]

The Tropical Pacific climate response to the changing forcing over the last glacial cycle William Roberts, Paul Valdes

We recently extended this record to approximately 120,000 years BP in order to track vegetation change over a full glacial cycle at millennial to orbital timescales.

(both quotes from «Eight glacial cycles...»).

Ice sheet models can be run through many glacial cycles (i.e. cold glacial periods and warm interglacial periods).

Huybrechts, P., 2002: Sea - level changes at the LGM from ice - dynamics reconstructions of the Greenland and Antarctic ice sheets during the glacial cycles.

Gallée, H., et al., 1991: Simulation of the last glacial cycle by a coupled, sectorally averaged climate — ice sheet model.

We also know humans were pretty much only in Africa for most of the glacial cycles and was highly mobile during the most recent.

Changes in the mode of Southern Ocean circulation over the last glacial cycle revealed by foraminiferal stale isotopic variability.

The glacial cycle repeats approximately every 100,000 years and consists of an interglacial and glacial period.

a) a glacial cycle over 100,000 years with warm interglacial periods in red and the long glacial period in between.

This could be explained by the role of the greenhouse gas CO2, which varies in abundance in the atmosphere in sync with the glacial cycles and thus acts as a «globaliser» of glacial cycles, as it is well - mixed throughout the atmosphere.

The combination of insolation at high latitude, solar irradiance, cloud cover, and carbon dixoide concentrations all combine to influence glacial cycles.

To understand the causes of glacial cycles, I looked at relevant data (northern polar circle summer insolation) and used the computer code by Laskar et al 1993 to compute future insolations.

Having briefly glanced at it, his main argument seems to come from overlaying the CO2 records at the same stage of different glacial cycles, and that seems quite hard to do, to me — William]

And if you argue that all modern species are adapted to Pleistocene glacial cycles, then logically, to stop the cycles will also be to upset the supposed plans of Nature.

I'm also intrigued by Raymo's idea that an important factor is that during recent glacial cycles, the ablation zone of N.Hem ice sheets is land - based but that of S.Hem ice is ocean - based.

This may also help explain why, before about 800 ky ago, glacial cycles were dominated by the 41 ky obliquity cycle, while precession had very little effect.

Well, the glacial cycle would just oxidize the soils now left unirrigated, our great cities would rot releasing hindreds of tons of carbon, the new growth forests might burn off.

However, if CO2 plays this role it is surprising that climatic proxies indicate that Antarctica seems to have warmed prior to the Northern Hemisphere, yet glacial cycles follow in phase with Northern insolation («INcoming SOLar radiATION») patterns, raising questions as to what communication mechanism links the hemispheres.

However, several «feedbacks» are known to have amplified the magnitude of the glacial cycles.

So to be safe, use a prior distribution with support the entire real line; afterall the glacial cycles might be due to something else completely un-understood in 1959.

The conclusion that they survived over at least two glacial cycles, where the amplitude of environmental change in the Arctic is quite large, suggests they have under natural conditions the ability to adapt / survive such changes.

I'd remind you that while humans have survived more than a full glacial cycle, we didn't yet exist as a species when temperatures last hit 3 C above our pre-Industrial levels, back in the Pliocene.

That's believed to be a crucial causal link in Milankovitch - driven glacial cycles, last I heard at least.

The glacial cycle of the past million years was forced by long - term orbital variations.

Second, sub-stage 19c lies near the middle - Pleistocene, a time when the climate system appears to have been most clearly transitioning from smaller amplitude, shorter period, and more symmetric glacial cycles, to the larger, longer, and more saw - toothed glacial cycles of the late Pleistocene.

When you look at the changes in Arctic temps during the warming side of glacial cycles, temps and co2 rise almost immediately.

Michael Tobis writes, «In fact, one of the mysteries of the glacial cycle is its regularity, i.e., predictability.»

For instance, there are still other problem GW is causing, such as glacier melt (which even the dalits and possible huge starvation issues for India, China, and many other places dependent on the glacial cycle for irrigation and drinking water.

What I was saying, technically, is that the Holocene interglacial would normally last another 50,000 years until the next glacial sets in, based on the Milankovich cycles which cause these glacial cycles.

In fact, one of the mysteries of the glacial cycle is its regularity, i.e., predictability.

There is good evidence and physical grounds for CO2 and orbital variations influencing glacial cycles, but that by no means shows that they completely control the glacial system.

Finally, there has been a long, on - going discussion of whether glacial cycles are primarily deterministic or stochastic.

[re predictability of glacial cycle]

It is true that during ice ages the oceans took up more CO2 and that is why there was less in the atmosphere, and during the warming at the end of glacial cycles that CO2 came back out of the ocean, and this was an important amplifying feedback.