Sentences with phrase «by abrupt climate change»

It is important not to be fatalistic about the threats posed by abrupt climate change.

lowered drastically by abrupt climate change.

«Researchers first became intrigued by abrupt climate change when they discovered striking evidence of large, abrupt, and widespread changes preserved in paleoclimatic archives.

«Researchers first became intrigued by abrupt climate change when they discovered striking evidence of large, abrupt, and widespread changes preserved in paleoclimatic archives... Modern climate records include abrupt changes that are smaller and briefer than in paleoclimate records but show that abrupt climate change is not restricted to the distant past.»

«Researchers first became intrigued by abrupt climate change when they discovered striking evidence of large, abrupt, and widespread changes preserved in paleoclimatic archives... The chapter concludes with examples of modern climate change and techniques for observing it.

Not exact matches

Maintenance of biodiversity in a rapidly changing climate will depend on the efficacy of evolutionary rescue, whereby population declines due to abrupt environmental change are reversed by shifts in genetically driven adaptive traits.

But within these long periods there have been abrupt climate changes, sometimes happening in the space of just a few decades, with variations of up to 10ºC in the average temperature in the polar regions caused by changes in the Atlantic ocean circulation.

Starting from the same kernel of scientific truth as did The Day After Tomorrow — that global warming could disrupt ocean currents in the North Atlantic — a study commissioned by the Pentagon, of all organizations, concluded that the «risk of abrupt climate change... should be elevated beyond a scientific debate to a U.S. national security concern.»

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.

You do seem not quite up to date with current thinking on abrupt climate changes (now I'm referring to your polemic question «Were all of these triggered by Lake Agassiz dam bursts?»

Title is: Abrupt Climate Change: evidence, mechanisms and implications A report for the Royal Society and the Association of British Science Writers by Mike Holderness, March 2003

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).

Hypotheses and inferences concerning the nature of abrupt climate change, exemplified by the Dansgaard - Oeschger (D / O) events, are reviewed.

Changes in atmospheric chemistry produced naturally and by humans, behavior of abrupt climate change events in the atmosphere; multiple controls on climate and the unique role of human impact.

Such are the questions tackled here during a trip to hominid settings in Europe and Africa, followed by an over-the-pole flight that looks down on the probable origins of the abrupt climate changes: great whirlpools in the North Atlantic Ocean near Greenland.

Manabe, S., and R.J. Stouffer, 1995: Simulation of abrupt climate change induced by fresh water input to the North Atlantic Ocean.

[Response: I suspect another common confusion here: the abrupt glacial climate events (you mention the Younger Dryas, but there's also the Dansgaard - Oeschger events and Heinrich events) are probably not big changes in global mean temperature, and therefore do not need to be forced by any global mean forcing like CO2, nor tell us anything about the climate sensitivity to such a global forcing.

Title is: Abrupt Climate Change: evidence, mechanisms and implications A report for the Royal Society and the Association of British Science Writers by Mike Holderness, March 2003

You do seem not quite up to date with current thinking on abrupt climate changes (now I'm referring to your polemic question «Were all of these triggered by Lake Agassiz dam bursts?»

In essence, what we argue for in the NRC abrupt change report is a concern for the possibility that there is indeed some presently unknown switch in the climate system that could reach a threshold of being activated if we perturb the climate sufficiently by increasing GHG concentration.

Hypotheses and inferences concerning the nature of abrupt climate change, exemplified by the Dansgaard - Oeschger (D / O) events, are reviewed.

The potential for abrupt climate change in our future was explored by a National Research Council committee and published in a very readable book called Abrupt Climate Change, Inevitable Surprises (2002), published by the National Academy abrupt climate change in our future was explored by a National Research Council committee and published in a very readable book called Abrupt Climate Change, Inevitable Surprises (2002), published by the National Academyclimate change in our future was explored by a National Research Council committee and published in a very readable book called Abrupt Climate Change, Inevitable Surprises (2002), published by the National Academy change in our future was explored by a National Research Council committee and published in a very readable book called Abrupt Climate Change, Inevitable Surprises (2002), published by the National Academy Abrupt Climate Change, Inevitable Surprises (2002), published by the National AcademyClimate Change, Inevitable Surprises (2002), published by the National Academy Change, Inevitable Surprises (2002), published by the National Academy Press.

By now, enough of the hard work of measuring and modeling has been done to provide high scientific confidence that while we are and will affect the north Atlantic with climate change, and this will have consequences, it is very unlikely that there will be a huge and abrupt change in the coming decades.

Some climate denialists continue to try and argue that rather than with a steady man - made warming signal, the data are better fit with abrupt step changes caused by El Niño events, followed by flat periods.

Even the relatively staid IPCC has warned of such a scenario: «The possibility of abrupt climate change and / or abrupt changes in the Earth system triggered by climate change, with potentially catastrophic consequences, can not be ruled out.

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).

A climate model that has positive feedback can be «tuned» by adjusting the inputs and internal model variables produce to make the model produce a rapid, very large, abrupt temperature response, to a small forcing change.

for article Abrupt glacial climate shifts controlled by ice sheet changes.

The 2002 NAS report — Abrupt Climate Change — inevitable surprises — was written by a committee of climate science lumiClimate Change — inevitable surprises — was written by a committee of climate science lumiclimate science luminaries.

Abrupt climate changes have repeatedly affected the planet, including local changes of as much as a 10 °C in a decade and changes in hydrology by a factor of two.

I have read the NAS link you provided and I agree with it, especially when it says abrupt climate change is most likely triggered by forcing changes [I said something like that on my first February 10 post here].

Michael Mann's new book, The Hockey Stick and the Climate Wars, discusses my comment [SMc note — this post is by Hu McCulloch], «Irreproducible Results in Thompson et al., «Abrupt Tropical Climate Change: Past and Present» (PNAS 2006),» that was published in 2009 in Energy & Environment.

the PDFs of future climate by region (including PDFs for abrupt climate change, PDFs for the duration until it begins, duration of the abrupt change, and PDFs for the magnitude and direction of the change)

This period, known as the «last deglaciation,» included episodes of abrupt climate change, such as the Bølling warming [~ 14.7 — 14.5 ka], when Northern Hemisphere temperatures increased by 4 — 5 °C in just a few decades [Lea et al., 2003; Buizert et al., 2014], coinciding with a 12 — 22 m sea level rise in less than 340 years [5.3 meters per century](Meltwater Pulse 1a (MWP1a)-RRB-[Deschamps et al., 2012].»

The paradigm shift was first applied to this new idea of how climate works by the NAS — «Abrupt climate change: inevitable surprises».

In a report released yesterday in Washington by the National Research Council, the research arm of the National Academy of Sciences, a panel of 11 scientists examined the possibility of abrupt climate change, in which small events can bring on rapid and great consequences.

There have been roughly a hundred published papers which try to explain the mechanisms by which solar changes and geomagnetic field changes cause cyclic and abrupt climate change.

The scientists stress that more work is needed to determine whether changes in ocean circulation initiated the abrupt climate changes or were an intermediary effect initially triggered by something else.

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.

(i.e. Abrupt and gradual climate changes are not caused by simple TSI changes.

Wallace S. Broecker, «Abrupt climate change: causal constraints provided by the paleoclimate record,» Earth - Science Reviews 51:137 - 154 (August 2000).

He sums it up this way: «The climate science establishment is so focused on the fight to reduce CO2 emissions that it has ignored the bigger picture: that the Earth System is hurtling towards a new climate regime for the planet, led by abrupt changes in the Arctic as it becomes seasonally free of sea ice.

«We are beginning to tease apart the sequence of abrupt climate change,» said White, whose work was funded by the National Science Foundation's Office of Polar Programs.

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).

By the mid-90s almost every paleoclimatologist was working on some aspect of abrupt climate change.

Abrupt climate change happens when the system is pushed past a threshold and transitions to a new state that is determined by shifts in cloud, wind, ice, currents and biology.

«The Earth's climate system is highly nonlinear: inputs and outputs are not proportional, change is often episodic and abrupt, rather than slow and gradual, and multiple equilibria are the norm... there is a relatively poor understanding of the different types of nonlinearities, how they manifest under various conditions, and whether they reflect a climate system driven by astronomical forcings, by internal feedbacks, or by a combination of both... [We] suggest a robust alternative to prediction that is based on using integrated assessments within the framework of vulnerability studies... It is imperative that the Earth's climate system research community embraces this nonlinear paradigm if we are to move forward in the assessment of the human influence on climate.»

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

There are numerous glaring omissions of citations — notably no mention is made of the work by Wunsch, Seager and Battisti, challenging the standard «Broecker - type» hypothesis for abrupt climate change.»