Sentences with phrase «abrupt climate change at»

1998 Jeffrey P. Severinghaus, et al., «Timing of Abrupt Climate Change at the End of the Younger Dryas Interval from Thermally Fractionated Gases in Polar Ice.»

«Timing of Abrupt Climate Change at the End of the Younger Dryas Interval from Thermally Fractionated Gases in Polar Ice.»

Andy — As far back as Severinghaus et al (Timing of abrupt climate change at the end of the Younger Dryas interval from thermally fractionated gases in polar ice, 1998, Nature), the ice - core data showed clearly that the abrupt climate changes (end of the Younger Dryas in that case) were faster than the methane changes.

Not exact matches

But, says Axel Timmermann, a professor of oceanography at the University of Hawaii at Manoa, «None of these snapshots were able to capture abrupt climate change and transition,» thereby making them less useful for predicting coming sudden shifts.

By making such an abrupt budget change, NASA will mothball or abandon half - built (in some cases, fully built) hardware, lose expertise developed at great effort, and leave gaps in data coverage, notably of the earth's climate.

Project leader Enno Schefuß from the MARUM — Center for Marine Environmental Sciences at the University of Bremen, Germany, adds: «The project was funded by the Deutsche Forschungsgemeinschaft in the priority programme «Integrated Analysis of Interglacial Climate Dynamics (INTERDYNAMIC)» with the aim to identify potential mechanisms triggering abrupt changes under current climatic conditions.

Our study suggests that at medium sea levels, powerful forces, such as the dramatic acceleration of polar ice cap melting, are not necessary to create abrupt climate shifts and temperature changes.»

The results suggested that signals that were indicative of abrupt climate change tended to propagate first at DF and later at EDC.

On p. 336: 271 Abrupt change from wet to dry in the Sahara (at least, as measured by offshore dust) as the summer sun gradually changes: Peter B. deMenocal, J. Ortiz, T. Guilderson, J. Adkins, M. Sarnthein, L. Baker, and M. Yarusinsky, «Abrupt onset and termination of the African Humid Period: Rapid climate responses to gradual insolation forcing,» Quaternary Science Review 19: 347 - 361 (2000).

Unlike the case of the D - O events and Younger Dryas which tell us something about what abrupt change is like in cold climates, we have no analogous climates we can look at to see what abrupt changes might be like in a hothouse world.

For the glacial period, comparisons to the Hulu Cave chronology demonstrated that WD2014 had an accuracy of better than 1 % of the age at three abrupt climate change events between 27 and 31ka.

At the University of Ottawa he is working on his PHD with a thesis about abrupt climate change.

What really concerns me is that I've read a lot about climate models not being able to replicate the magnitude of abrupt regional temperature changes in the past, and Raypierre has said here that he fears that past climate records point towards some yet unknown positive feedback which might amplify warming at the northern latitudes.

Many paleoclimate archives document climate changes that happened at rates considerably exceeding the average rate of change for longer - term averaging periods prior and after this change... A variety of mechanisms have been suggested to explain the emergence of such abrupt climate changes (see Section 12.5.5).

In August, 2006, I gave a power - point - presentation at the Veterans For Peace National Convention titled, «A World of Hurt or Hope: The National Security Implications of Global warming / Abrupt Climate Change.

and of interest an article Abrupt Climate Change Focus Of U.S. National Laboratories at http://www.sciencedaily.com/releases/2008/09/080918192943.htm

Unlike the case of the D - O events and Younger Dryas which tell us something about what abrupt change is like in cold climates, we have no analogous climates we can look at to see what abrupt changes might be like in a hothouse world.

However, when you look at all the «big picture» evidence of the global system it is clear that there is nothing «natural» about it, in fact it appears that the planet is in early stages of an abrupt change of climate from our «normal» system to one that is much warmer and tropical like.

With respect to the all - too - prevalent misunderstandings about what is possible and what is unlikely with methane and the Arctic, and other issues, I thought Richard Alley did a good job presenting the facts at the AGU, putting the different issues in perspective with his invited lecture, «Abrupt Climate Change in the Arctic».

The end of the first half of the Holocene — between about 5 and 4 ka — was punctuated by rapid events at various latitudes, such as an abrupt increase in NH sea ice cover (Jennings et al., 2001); a decrease in Greenland deuterium excess, reflecting a change in the hydrological cycle (Masson - Delmotte et al., 2005b); abrupt cooling events in European climate (Seppa and Birks, 2001; Lauritzen, 2003); widespread North American drought for centuries (Booth et al., 2005); and changes in South American climate (Marchant and Hooghiemstra, 2004).

Having examined — over the last 16 years — large amounts of data (time series) for signs of abrupt changes I have no difficulty at all in accepting BEST's hypothesis that climate data appear to be suffused with abrupt changes.

The American Association for the Advancement of Science, the world's largest general scientific society with a membership of 121,200 scientists and «science supporters» globally, just released an 18 - page report confirming that the world is at growing risk of «abrupt, unpredictable and potentially irreversible changes» due to climate change.

Anastasios Tsonis, of the Atmospheric Sciences Group at the University of Wisconsin, Milwaukee, and colleagues used a mathematical network approach to analyse abrupt climate change on decadal timescales.

Oceans are usually thought to take much longer to change (it takes six years for ocean currents to get from Labrador to Bermuda), so those who worry about abrupt climate change tend to look at potential cell reorganizations in the atmosphere with considerable interest.

Climate data at all scales show abrupt changes.

The American Association for the Advancement of Science acknowledged this brilliantly earlier this year, releasing an 18 - page report consisting of «just the facts,» which confirmed that the world is at growing risk of «abrupt, unpredictable and potentially irreversible changes» due to climate change.

With abrupt climate change — the new paradigm to replace AGW — the stage is set for radical change within as little as a decade possible at any time from natural causes — let alone with the interesting experiment of anthropogenic emissions in the mix (NAS Committee on Abrupt Climate Change 2002, Woods Hole Oceanographic Institute Abrupt Climate Change Page, Royal Society abrupt climate change — the new paradigm to replace AGW — the stage is set for radical change within as little as a decade possible at any time from natural causes — let alone with the interesting experiment of anthropogenic emissions in the mix (NAS Committee on Abrupt Climate Change 2002, Woods Hole Oceanographic Institute Abrupt Climate Change Page, Royal Societyclimate change — the new paradigm to replace AGW — the stage is set for radical change within as little as a decade possible at any time from natural causes — let alone with the interesting experiment of anthropogenic emissions in the mix (NAS Committee on Abrupt Climate Change 2002, Woods Hole Oceanographic Institute Abrupt Climate Change Page, Royal Society change — the new paradigm to replace AGW — the stage is set for radical change within as little as a decade possible at any time from natural causes — let alone with the interesting experiment of anthropogenic emissions in the mix (NAS Committee on Abrupt Climate Change 2002, Woods Hole Oceanographic Institute Abrupt Climate Change Page, Royal Society change within as little as a decade possible at any time from natural causes — let alone with the interesting experiment of anthropogenic emissions in the mix (NAS Committee on Abrupt Climate Change 2002, Woods Hole Oceanographic Institute Abrupt Climate Change Page, Royal Society Abrupt Climate Change 2002, Woods Hole Oceanographic Institute Abrupt Climate Change Page, Royal SocietyClimate Change 2002, Woods Hole Oceanographic Institute Abrupt Climate Change Page, Royal Society Change 2002, Woods Hole Oceanographic Institute Abrupt Climate Change Page, Royal Society Abrupt Climate Change Page, Royal SocietyClimate Change Page, Royal Society Change Page, Royal Society 2010).

That abrupt climate change happens, things like Younger Dryas happen, doesn't mean that the system is completely chaotic and trying to assign probabilities at all levels for all variables is a worthless exercise.

The model has two stable states with two points of abrupt climate change — the latter at the transitions from the blue lines to the red from above and below.

The article here reviews abrupt change in simple systems, in a 1 - D climate model and in the climate system at multi-decadal timescales.

This article reviews abrupt change in simple systems, in a 1 - D climate model and in the climate system at multi-decadal timescales.

Uniquely and fearlessly AMEG has studied key non-linear trends in the Earth - human System and reached the stunning conclusion that the planet stands at the edge of abrupt and catastrophic climate change as a result of an unprecedented rate of change in the Arctic.

There is smoking gun evidence that it left at the past cyclic climate changes gradual and abrupt that points to the sun.

At the darkest end of the spectrum are groups like Deep Green Resistance, which openly advocates sabotage to «industrial infrastructure,» and the thousands who visit the Web site and attend the speeches of Guy McPherson, a biology professor at the University of Arizona who concluded that renewables would do no good, left his job, and moved to an off - grid homestead to prepare for abrupt climate changAt the darkest end of the spectrum are groups like Deep Green Resistance, which openly advocates sabotage to «industrial infrastructure,» and the thousands who visit the Web site and attend the speeches of Guy McPherson, a biology professor at the University of Arizona who concluded that renewables would do no good, left his job, and moved to an off - grid homestead to prepare for abrupt climate changat the University of Arizona who concluded that renewables would do no good, left his job, and moved to an off - grid homestead to prepare for abrupt climate change.

Gradual, insolation - driven millennial - scale temperature trends in the study area were punctuated by several abrupt climate changes, including a major transient event recorded in all five lakes between 4.3 and 3.2 ka, which overlaps in timing with abrupt climate changes previously documented around the North Atlantic region and farther afield at w4.2 ka.

Axel Timmermann, a professor of oceanography at the University of Hawaii who studies abrupt climate changes and was not involved in this study, called it a «breakthrough analysis.»

«Our study supports the view that changes in ocean circulation were at least in part responsible for causing abrupt climate changes.

There is smoking gun evidence (cosmogenic isotope changes BE10 and C14) shows there are cyclic changes to the sun and abrupt changes to the sun and that the solar change occur at every climate change event.

219 Discovery of Younger Dryas: Dorothy Peteet, «Sensitivity and rapidity of vegetational response to abrupt climate change,» Proceedings of the National Academy of Sciences (U.S.) 97 (4): 1359 - 1361 (15 February 2000) at http://www.pnas.org/cgi/content/full/97/4/1359

For some contrasts between the Younger Dryas and the most serious droughts since then at 8200, 5200, and 4200 years ago, see Fagan (1999) and Harvey Weiss, «Beyond the Younger Dryas: Collapse as adaptation to abrupt climate change in ancient West Asia and the Eastern Mediterranean,» pp. 75 - 98 in Confronting Natural Disaster: Engaging the Past to Understand the Future, G. Bawden and R. Reycraft, editors (University of New Mexico Press 2000), at http://www.yale.edu/nelc/weiss/byd.html.

Richard B. Alley, «Ice - core evidence of abrupt climate changes,» Proceedings of the National Academy of Sciences 97 (4): 1331 - 1334 (15 February 2000) at http://www.pnas.org/cgi/content/full/97/4/1331.

279 Abrupt change from wet to dry in the Sahara (at least, as measured by offshore dust) as the axial tilt gradually changes: Peter B. deMenocal, J. Ortiz, T. Guilderson, J. Adkins, M. Sarnthein, L. Baker, and M. Yarusinsky, «Abrupt onset and termination of the African Humid Period: Rapid climate responses to gradual insolation forcing,» Quaternary Science Review 19: 347 - 361 (2000).

The orientation of these features at the Bahamas and Bermuda points to a very large and extremely energetic and weather systems in the North Atlantic Ocean at this critical time of abrupt climate change.

The view was supported by data gathered independently at the University of Wisconsin - Madison, where Reid Bryson was already interested in abrupt climate changes.

After another abrupt climate change, we have at least a «pause.»

«The abrupt climate changes did not take place at the extreme low sea levels, corresponding to the time of maximum glaciations 20,000 years ago, or at high sea levels such as those prevailing today.

The Guardian: The world is at growing risk of «abrupt, unpredictable and potentially irreversible changes» because of a warming climate, America's premier scientific society warned on Tuesday.

«At medium sea levels, powerful forces − such as the dramatic acceleration of polar ice cap melting − are not necessary to result in abrupt climate shifts and associated drastic temperature changes.»

Most important was a widely noted paper by Ewing and William Donn, who were «stimulated by the observation that the change in climate which occurred at the close of the [most recent] glacial period was extremely abrupt.»

Most experts now accepted that abrupt climate change, huge change, global change, was possible at any time.