Sentences with phrase «ice age patterns»

Not exact matches

They note past ages that have been equally warm or warmer without human influence, to say nothing of repeating patterns of climate change like ice ages (though I've met one of James Hansen's computer modelers who told me with sincere conviction that there would not be another ice age).

So if you think of going in [a] warming direction of 2 degrees C compared to a cooling direction of 5 degrees C, one can say that we might be changing the Earth, you know, like 40 percent of the kind of change that went on between the Ice Age; and now are going back in time and so a 2 - degree change, which is about 4 degrees F on a global average, is going to be very significant in terms of change in the distribution of vegetation, change in the kind of climate zones in certain areas, wind patterns can change, so where rainfall happens is going to shift.

They didn't properly consider the bone biting and crushing patterns of ice age hyenas that scavenged extensively in European cave bear dens.

«We have now added a view of the climate changes at the end of another ice age, for comparison, and we found that the patterns were different,» said co-author Professor Eelco Rohling, from the University of Southampton and ANU.

The new results reveal that the pattern of modern ice loss is similar to that which has prevailed since the end of the last ice age.

The researchers looked at the pattern of extinctions for 177 species of mammals weighing 10 kilograms or more between 132,000 years ago (the height of the next - to - last ice age to strike the Northern Hemisphere) and 1000 years ago (a time at which the ecological effects of human exploration and expansion became unquestionable).

Climate changes following the pattern of the last ice age are therefore not anticipated under today's conditions.

But during a period of several thousand years up until the last ice age ended approximately 12,000 years ago, this pattern did not fit and this was a mystery to researchers.

Earth is currently nearly circular in its orbit and, if this Oligocene pattern were to be followed, would next be headed into another ice age in about 50,000 years.

Ocean sediment reveals the pattern behind the rise and fall of ice ages and the shape of Earth's orbit.

In the long term, changes in sea level were of minor importance to rainfall patterns in north western Sumatra With the end of the last Ice Age came rising temperatures and melting polar ice sheets, which were accompanied by an increase in rainfall around Indonesia and many other regions of the worlIce Age came rising temperatures and melting polar ice sheets, which were accompanied by an increase in rainfall around Indonesia and many other regions of the worlice sheets, which were accompanied by an increase in rainfall around Indonesia and many other regions of the world..

Secondly, it was becoming clear that ice ages followed a regular pattern and that interglacials (such as we are now in) were much shorter that the full glacial periods in between.

Based on the comparison between reconstructions and simulations, there is high confidence that not only external orbital, solar and volcanic forcing, but also internal variability, contributed substantially to the spatial pattern and timing of surface temperature changes between the Medieval Climate Anomaly and the Little Ice Age (1450 to 1850).

Mike's work, like that of previous award winners, is diverse, and includes pioneering and highly cited work in time series analysis (an elegant use of Thomson's multitaper spectral analysis approach to detect spatiotemporal oscillations in the climate record and methods for smoothing temporal data), decadal climate variability (the term «Atlantic Multidecadal Oscillation» or «AMO» was coined by Mike in an interview with Science's Richard Kerr about a paper he had published with Tom Delworth of GFDL showing evidence in both climate model simulations and observational data for a 50 - 70 year oscillation in the climate system; significantly Mike also published work with Kerry Emanuel in 2006 showing that the AMO concept has been overstated as regards its role in 20th century tropical Atlantic SST changes, a finding recently reaffirmed by a study published in Nature), in showing how changes in radiative forcing from volcanoes can affect ENSO, in examining the role of solar variations in explaining the pattern of the Medieval Climate Anomaly and Little Ice Age, the relationship between the climate changes of past centuries and phenomena such as Atlantic tropical cyclones and global sea level, and even a bit of work in atmospheric chemistry (an analysis of beryllium - 7 measurements).

Here's more previous analysis of Arctic ice patterns during the Holocene, the span since the end of the last ice age.

At the hemispheric - mean scale, the «Little Ice Age» is only a moderate cooling because larger offsetting regional patterns of temperature change (both warm and cold) tend to cancel in a hemispheric or global mean.

See e.g. this review paper (Schmidt et al, 2004), where the response of a climate model to estimated past changes in natural forcing due to solar irradiance variations and explosive volcanic eruptions, is shown to match the spatial pattern of reconstructed temperature changes during the «Little Ice Age» (which includes enhanced cooling in certain regions such as Europe).

In the short video above, Dr. Alley explains how some patterns in the changes that occur during Earth's ice ages and warm intervals (like the last 11,000 years) prove that greenhouse gases exert a warming effect.

Althoug absent ice age - integlacial response, orbital forcing still affects low - latitude circulation patterns (monsoons).

The pattern just shows we came out of the little ice age.

John Carter August 8, 2014 at 12:58 am chooses to state his position on the greenhouse effect in the following 134 word sentence: «But given the [1] basics of the greenhouse effect, the fact that with just a very small percentage of greenhouse gas molecules in the air this effect keeps the earth about 55 - 60 degrees warmer than it would otherwise be, and the fact that through easily recognizable if [2] inadvertent growing patterns we have at this point probably at least [3] doubled the total collective amount in heat absorption and re-radiation capacity of long lived atmospheric greenhouse gases (nearly doubling total that of the [4] leading one, carbon dioxide, in the modern era), to [5] levels not collectively seen on earth in several million years — levels that well predated the present ice age and extensive earth surface ice conditions — it goes [6] against basic physics and basic geologic science to not be «predisposed» to the idea that this would ultimately impact climate.»

«To summarize - Using the 60 and 1000 year quasi repetitive patterns in conjunction with the solar data leads straightforwardly to the following reasonable predictions for Global SSTs 1 Continued modest cooling until a more significant temperature drop at about 2016 - 17 2 Possible unusual cold snap 2021 - 22 3 Built in cooling trend until at least 2024 4 Temperature Hadsst3 moving average anomaly 2035 — 0.15 5Temperature Hadsst3 moving average anomaly 2100 — 0.5 6 General Conclusion — by 2100 all the 20th century temperature rise will have been reversed, 7 By 2650 earth could possibly be back to the depths of the little ice age.

Abstract — 2008 Climate and wildfires in the North American boreal forest... Climate controls the area burned through changing the dynamics of large - scale teleconnection patterns (Pacific Decadal Oscillation / El Niño Southern Oscillation and Arctic Oscillation, PDO / ENSO and AO) that control the frequency of blocking highs over the continent at different time scales......... Since the end of the Little Ice Age, the climate has been unusually moist and variable: large fire years have occurred in unusual years, fire frequency has decreased and fire — climate relationships have occurred at interannual to decadal time scales...... http://rstb.royalsocietypublishing.org/content/363/1501/2315.short ----------------------

«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.

Beginning in the year 1,000, the Earth's natural climate patterns appeared as though we were headed towards an Ice Age.

There is concern in the scientific community that the temperature change from now to the end of the century will be roughly the same as the difference between now and the last Ice Age, which occurred 10,000 years ago, resulting in dramatic changes in temperature, weather patterns, water tables, land and biodiversity.

Among other things, if one sets aside the astronomical Milankovich cycle suggestion as the driver of glacial epochs, the ice ages might be quasi-periodic oscillations like the ENSO pattern.

«The most active period of the witchcraft trials coincides with a period of lower than average temperature known to climatologists as the «little ice age»... In a time period when the reasons for changes in weather were largely a mystery, people would have searched for a scapegoat in the face of deadly changes in weather patterns.

Instrumental temperature records have now been kept for long enough for us to have lots of graphs that show a sawtooth pattern of rising temperatures since the end of the little ice age.

The solar hypothesis appears to fit the observed pattern of climatic fluctuation in much greater detail, and does not call for an imminent Ice Age.

Meier et al. (National Snow and Ice Data Center); 4.74 Million Square Kilometers; Statistical Prediction by Stroeve et al. shown in the June outlook remains unchanged since it was based on spring ice age fields and an average summer circulation patteIce Data Center); 4.74 Million Square Kilometers; Statistical Prediction by Stroeve et al. shown in the June outlook remains unchanged since it was based on spring ice age fields and an average summer circulation patteice age fields and an average summer circulation pattern.

All you have to do is look at the glaciation pattern during the Wisconsin ice age and you have a good idea of where the snow will be.

The pattern of temperatures shows a rise as the world emerged from the last deglaciation, warm conditions until the middle of the Holocene, and a cooling trend over the next 5000 years that culminated around 200 years ago in the Little Ice Age.

The «hiding the decline» refers neither to Little Ice Age (as the Spiked Online version says) nor the recent pause in the upward trend of temperatures, but rather the pasting of current temperature data onto some rather dubious proxy data to continue the hockey stick pattern through the 20th century.

Following the usual pattern, Plass was mainly interested in the way variations in CO2 might solve the mystery of the ice ages.

The different patterns can be used to hunt for now - disappeared glaciers from past ice ages.

Current GCM models may have realistic - seeming weather patterns, but are totally incapable of producing phenomena that look like the Holocene (Little Ice Age, Medieval Warm Period, Roman Warm Period, Holocene Optimum, the steady decline of temperature on average over the last 3,000 years, etc.) The Climate Science community has, instead, taken the path of trying to claim that these swings didn't occur (Michael Mann's «Hockey Stick», etc.) This does not give me a lot of confidence in the rest of their «science».

Climate change is the change in weather pattern due to natural, periodic and cyclical swings in temperatures such as the ice age which covers a much longer period of time usually for thousands of years.

Over the last million years, the pattern recorded in cores of Greenland ice has occurred over and over: a long stagger into an ice age, a faster stagger out of the ice age, a few millennia of stability, repeat.

As the Earth came out of the ice age the primary forcing which caused the initial warming was due to changes in the Earth's orbital pattern.

«The scientists, Ian Joughlin, a geologist at CIT, and Slawek Tulaczyk, a professor of earth sciences at UC Santa Cruz, speculate the thickening ice sheets are repeating a pattern that occurred from 1650 -1850 when the Earth went through what became known as the Little Ice Agice sheets are repeating a pattern that occurred from 1650 -1850 when the Earth went through what became known as the Little Ice AgIce Age.3

In response to your question I would refer you to my comment above Dave Wendt (14:39:39): where I discuss the Rigor and Wallace paper of 2004 which demonstrated that the decline in sea ice age and thickness began with a shift in state in Beaufort Gyre and the TransPolar Drift in 1989 which resulted in multiyear ice declining from over 80 % of the Arctic to 30 % in about one year and that the persistence of that pattern has been responsible for the continuing decline.

Peterson and Haug 2006 and Newton et al 2006, for example, attribute the coherence to latitudinal migrations of the ITCZ, hypothesizing that it (and other patterns) was further north in the Medieval period and further south in the Little Ice Age, explaining antiphase changes in precipitation whereby northerly tropical sites became drier in the Little Ice Age (Cariaco, Yucatan etc 15N or so) while more southerly tropical sites became wetter in the Little Ice Age (Lake Titicaca, Lake Malawi, Quelccaya etc. all at 10S or so).

As its this type of Polar jet pattern that l suspect what was going on during the ice age.

The hockey stick pattern also shows up in the following papers: «Medieval Warm Period, Little Ice Age and 20th century temperature variability from Chesapeake Bay» «Inter-hemispheric temperature variability over the past millennium»

We are particularly interested in abrupt climate change and patterns of droughts and floods as well as warm intervals and recent coolings such as the Little Ice Age.

«To summarize — Using the 60 and 1000 year quasi repetitive patterns in conjunction with the solar data leads straightforwardly to the following reasonable predictions for Global SSTs 1 Continued modest cooling until a more significant temperature drop at about 2016 - 17 2 Possible unusual cold snap 2021 - 22 3 Built in cooling trend until at least 2024 4 Temperature Hadsst3 moving average anomaly 2035 minus 0.15 degrees 5Temperature Hadsst3 moving average anomaly 2100 minus 0.5 degrees 6 General Conclusion — by 2100 all the 20th century temperature rise will have been reversed, 7 By 2650 earth could possibly be back to the depths of the little ice age.

In the long term, the current could be shut down altogether, which would lead to dramatic shifts in global weather patterns, including the possibility of bringing much of Northern Europe back into an ice age.

If rising temperature was responsible for unexplained ones, can we assume that there weren't any weather patterns during the last ice age?

The models (and there are many) have numerous common behaviours — they all cool following a big volcanic eruption, like that at Mount Pinatubo in 1991; they all warm as levels of greenhouse gases are increased; they show the same relationships connecting water vapour and temperature that we see in observations; and they can quantify how the giant lakes left over from the Ice Age may have caused a rapid cooling across the North Atlantic as they drained and changed ocean circulation patterns.