Sentences with phrase «during ice ages»

The North Atlantic seems to resonate at either 60 to 70 years, or, during ice ages, shorter times on the order of 20 to 25 years.

The great thing is that, since we can make good estimates of the changes in solar radiation, changes in the Earth's albedo due to melting ice, and changes in atmospheric CO2 concentration during the ice ages, scientists can directly calculate the sensitivity of the climate to changes in the atmospheric CO2 concentration.

No polar ice caps is the predominant state of the earth's climate with only rare departures during ice ages which are comparatively short - lived.

Some things that changed in paleo times that are maybe not included in the models: 1) during ice ages, both winds and dust (not surprisingly joined) were much higher, likely due to a stronger equator - to - pole temperature gradient.

6) There is less eK in the entire A during ice ages, and cold ocean waters also store (sink) more CO2 within.

To a first approximation, sea - level changes reflect the volume of ocean water bound in continental ice sheets during the ice ages.

Linden / Giessen is where one of the main series of the late Ernst Beck's 1942 «peak» in CO2 was based on: Further, land plants as usual grow on land, where CO2 levels are average 40 ppmv higher than background and even higher during inversion, giving at least a few hours of sufficient CO2 during ice ages.

During the ice ages, C3 bushes and trees died back considerably and most of the land surface was composed of grassland, desert, tundra and ice.

So CO2 might be stored in the deep ocean during ice ages, and then get released when the climate warms.]»

So CO2 during ice ages should be thought of as a «feedback», much like the feedback that results from putting a microphone too near to a loudspeaker.

There is a level that is approached during the ice ages below which plant life does not grow very well at all.

The Paleoclimatologic record suggests that when the sudden changes involve temperature, they are more probable during ice ages — i.e., intervals when the surface was covered with more snow and ice capable of mediating strong feedbacks than during interglacials.

It is more useful for much longer - term scenarios where CO2 changes significantly but then stabilizes for some hundreds or thousands of years, as during the ice ages.

CO2 during the ice ages is a natural response of temperature (soda bottle outgassing), that fact doesn't predict anything if you artificially add extra CO2 into the atmosphere.

Dramatic changes in the distribution of plants and animals during the ice ages illustrate how climate influences the distribution of species.

Scientists are confident CO2 was lower during the ice ages and that its rise was coupled to rising temperatures when Earth moved to an interglacial.

Scientists who have studied past phases of climate change have found that iron dust may have caused similar effects during ice ages and are hoping to replicate those without causing unwanted fallout.

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.

This may be partly by dryer air and changes in vegetation, but also by more severe winds / storms during ice ages.

However, additional analyses that look at the factors controlling temperature during the ice ages give strong grounds for believing that CO2 does play an important role.

Something similar can be seen in Antarctic ice cores: far more dust is settled in the ice cores during ice ages than during interglacials.

The temperature gradient between equator and poles is higher during ice ages than during interglacials...

In that span, the amount of CO2 in the air fluctuated between 190 and 280 parts per million — low during ice ages and high during warm intervals.

Sometimes described as the «eighth wonder of the world», Milford Sound was carved by glaciers during the ice ages.

Described as the «eighth wonder of the world», Milford Sound was carved by glaciers during the ice ages.

Carbon dioxide levels, for example, are at an all - time high of more than 400 parts per million — more than double the amount during the ice ages.

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.

Two new studies suggest that during ice ages, steep drops in temperature may have sent ancient species moving to warmer areas.

While natural global warming during the ice ages was initiated by increased solar radiation caused by cyclic changes to Earth's orbital parameters, there is no evident mechanism for correcting Anthropogenic Global Warming over the next several centuries.

The land bridge forms during ice ages, when much of the water on the planet becomes part of growing continental glaciers, making the sea level much lower than it is today,» explained Shapiro.

And he has this ice age scenario, which Jensen and Kamin share; and when the human race came out of Africa, the theory is that East Asians, Koreans, Japanese and Chinese, were trapped north of the Himalayas during the ice ages and therefore were selected most rigorously by a harsh environment for intelligence and for prudence and all sorts of things.

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

During ice ages, glaciers scour and cover large swaths of land, wiping out plant communities for millennia.

«Populations in Europe appear to have contracted during ice ages whereas African populations have expanded at those times, suggesting that environmental conditions there were more favourable,» says Matthew Webster.

During the ice ages, storage of the greenhouse gas CO2 in the Southern Ocean contributed significantly to global cooling.

Studies of the organisms that lived there — and may still — will provide insight into life during the ice ages and on other planets, scientists say.

During ice ages, which are mainly driven by rhythmic variations in Earth's orbit and spin that alter sunlight in the Northern Hemisphere, growing ice caps and glaciers trap so much frozen water on land that sea levels can drop a hundred meters or more.

«One of the big questions is: Why was the climate and why were CO2 levels so different during ice ages than during warm times?

One popular theory is that the first native North Americans ventured from Asia over an ice - free, Alaskan land bridge to what is now western and central Canada during the Ice Age.

The nation claims that its ancestors fled for survival to a coastal area in Canada that never froze during the Ice Age.

«We are here because one odd group of fishes had a peculiar fin anatomy that could transform into legs for terrestrial creatures; because the earth never froze entirely during an ice age; because a small and tenuous species, arising in Africa a quarter of a million years ago, has managed, so far, to survive by hook and by crook.

There has been speculation that the reason could be astronomical variations, but we can now rule this out as the large fluctuation during the ice age behave in the same «fractal» way as the other natural fluctuations across the globe,» Peter Ditlevsen.

«We can see that the climate during an ice age has much greater fluctuations than the climate during an interglacial period.

John Stewart said, «During the Ice Age just over 40 thousand years ago in the north of England Neanderthals were living in an environment which included extinct animals like woolly mammoths, woolly rhinos and cave hyenas as well as the more familiar horses and reindeer.

There are native earthworms in North America, but not in regions that had been covered in glaciers during the Ice Age.

«We therefore have proof that the species disappeared during an ice age caused by the activity of the first volcanism in the Siberian Traps,» added Urs Schaltegger.

Scientists believe that during the ice age this strait was frozen over, allowing for homosapiens and other animals to cross.

Reindeer and polar foxes were found in Central Europe during the Ice Age, for example, but they withdrew northwards as the climate became warmer,» says Postdoctoral Fellow Christopher Sandom, Aarhus University.

They include the giant deer, which populated huge areas of Eurasia during the Ice Age.

«According to the fossil record of bones, roadrunners didn't appear until very recently, in the last million years during the Ice Age.