Sentences with phrase «ice age conditions for»

The Younger Dryas is considered a cold period when climate returned to near ice age conditions for a while but during the Younger Dryas, the Midwestern US had hotter Summers than before the event.

The Earth has been locked in ice age conditions for more than 80 % of the time over the last one million years.

Not exact matches

One is changed environmental conditions for a discrete subpopulation of the original population, such as when ice ages cause dramatic changes in sea levels, cutting species into subgroups.

In turn, we can see which animals were dispersing into new areas, particularly as an ice age was ending in the southern continents and environmental conditions were becoming more favorable for reptiles and amphibians.»

«We've shown for the first time that different populations in different parts of the Fertile Crescent were coming up with similar solutions to finding a successful way of life in the new conditions created by the end of the last Ice Age.»

Combine the two and you've got a total system sensitivity for conditions during an ice age.

Combine the two and you've got a total system sensitivity for conditions during an ice age.

This is the same problem as for volcanoes except that it takes thousands of years for an ice age to develop and human prevention of this happening with greenhouse gasses will be very uncertain to predict for more than one hundred years so an odds calculation would, necessarily, require exact specification of conditions.

Ecological succession and biological evolution would also provide hysteresis (for example, I read of an idea that under some conditions, bogs will tend to take over forests; these bogs will have a higher albedo than forest when snow falls, thus potentially bringing an ice age...).

In the past 200,00 years ice age conditions have prevailed for approximately 174, 000 years.

It is also possible for cold climates to increase chemical weathering in some ways, by lowering sea level to expose more land to erosion (though I'd guess this can also increase oxydation of C in sediments) and by supplying more sediments via glacial erosion for chemical weathering (of course, those sediments must make it to warmer conditions to make the process effective — downhill and downstream, or perhaps via pulsed ice ages -LRB-?)-RRB-.

[14] Although there is an extreme scarcity of data from Australia (for both the Medieval Warm Period and Little Ice Age) evidence from wave built shingle terraces for a permanently full Lake Eyre during the ninth and tenth centuries is consistent with this La Niña - like configuration, though of itself inadequate to show how lake levels varied from year to year or what climatic conditions elsewhere in Australia were like.

Regarding conditions for spring 2012, Figure 4 shows maps of ice categories derived from sea - ice age for the beginning of May 2012, with maps for early May and mid-September 2011 included for comparison.

Most well known during the Younger Dryas event around 11600 years BP when the ice age conditions returned for around 600 years following the warming during Older Dryas.

While the conditions in the geological past are useful indicators in suggesting climate and atmospheric conditions only vary within a a certain range (for example, that life has existed for over 3 billion years indicates that the oxygen level of the atmosphere has stayed between about 20 and 25 % throughout that time), I also think some skeptics are too quick to suggest the lack of correlation between temperature and CO2 during the last 550 million years falsifies the link between CO2 and warming (too many differences in conditions to allow any such a conclusion to be drawn — for example the Ordovician with high CO2 and an ice age didn't have any terrestrial life).

It is often suggested that lower total solar irradiance (TSI) due to a decline in solar activity (less sunspots) was responsible for the Little Ice Age, a period of colder weather conditions from the end of the Middle Ages to... Continue reading →

When people are told to stop watering their lawns because of a water shortage, they escalate (in the manner of sports hyperbole) to use the same word, drought, as is used for far more serious conditions, on a far vaster scale and lasting many years — such as the 1930s Dust Bowl or those three Little Ice Age droughts amidst good times in East Africa, lasting 30, 65, and 80 years.

Regarding initial conditions for Spring 2010, Figure 2 by Maslanik and others shows maps of sea ice classes derived from sea ice age for April 2010 and 2009.

report that ocean sediment cores containing an «undisturbed history of the past» have been analyzed for variations in PP over timescales that include the Little Ice Age... they determined that during the LIA the ocean off Peru had «low PP, diatoms and fish,» but that «at the end of the LIA, this condition changed abruptly to the low subsurface oxygen, eutrophic upwelling ecosystem that today produces more fish than any region of the world's oceans... write that «in coastal environments, PP, diatoms and fish and their associated predators are predicted to decrease and the microbial food web to increase under global warming scenarios,» citing Ito et al..

As noted last month, this range depends in part on the relative weight that the respondents give to «initial conditions,» e.g., age and thickness of sea ice at the end of spring, versus whether summer winds in 2008 will be as supportive for ice loss as the favorable winds were in 2007.

Below are archived ice age charts from the US National Snow and Ice Data Center (NSIDC) for some previous years when Beaufort bears had trouble, especially 2004 - 2006, with which I compare this year's conditioice age charts from the US National Snow and Ice Data Center (NSIDC) for some previous years when Beaufort bears had trouble, especially 2004 - 2006, with which I compare this year's conditioIce Data Center (NSIDC) for some previous years when Beaufort bears had trouble, especially 2004 - 2006, with which I compare this year's conditions.

As the earth continues to recover from the abnormally cold conditions of the centuries - long Little Ice Age, warmer temperatures, improving soil moisture, and more abundant atmospheric carbon dioxide have helped bring about a golden age for global agricultural productiAge, warmer temperatures, improving soil moisture, and more abundant atmospheric carbon dioxide have helped bring about a golden age for global agricultural productiage for global agricultural production.

Suppose that you mark the initial conditions that lead to different climates by red for Europe, green for Jurrasic Park, and blue for Ice Age and now draw a little circle around some starting points.

For example, a few degrees of global warming transformed the freezing conditions of the last ice age into our present mild climate.

We study climate sensitivity and feedback processes in three independent ways: (1) by using a three dimensional (3 - D) global climate model for experiments in which solar irradiance So is increased 2 percent or CO2 is doubled, (2) by using the CLIMAP climate boundary conditions to analyze the contributions of different physical processes to the cooling of the last ice age (18K years ago), and (3) by using estimated changes in global temperature and the abundance of atmospheric greenhouse gases to deduce an empirical climate sensitivity for the period 1850 - 1980.

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