Sentences with phrase «neoproterozoic palaeoclimates»

These changes coincide with the different palaeoclimate zones proposed in the models, so the faunal distribution was probably climate - related,» comments Josep Fortuny, an ICP researcher who took part in the study.

«The discrepancy could arise, of course, from the opposite problem: that the palaeoclimate proxy data are underestimating hydroclimatic extremes.

Annan, J.D., et al., 2005b: Efficiently constraining climate sensitivity with palaeoclimate observations.

«Palaeosens (2012)» — the reference in footnote 1 — is http://www.nature.com/nature/journal/v491/n7426/abs/nature11574.html Making sense of palaeoclimate sensitivity PALAEOSENS Project Members

You have to design models that are highly computationally efficient to study palaeoclimate.

Dynamics and palaeoclimate Reviews of the top 10 best rich men dating sites and apps exclusively for the rich and beautiful.

In models run with the GISS forcing data, the «natural + anthropogenic» temperature evolution matches observations very well for a climate sensitivity of 0.75 °C / W / m ², which agrees with the value derived from palaeoclimate data.

In all this, why don't you pay attention to the physical models we have: the climate over the last few decades, and palaeoclimate.

«Palaeosens (2012)» — the reference in footnote 1 — is http://www.nature.com/nature/journal/v491/n7426/abs/nature11574.html Making sense of palaeoclimate sensitivity PALAEOSENS Project Members

In trying to answer this question, some scientists (such as Dr Schmidt) refer to the palaeoclimate record.

I'm chagrined to report that I sailed across the site of the 1452 eruption in 1975, but did not recognize the Kuwae caldera's island remnants as such, as I was searching the New Hebrides (now Vanuatu) for archaeological lithic sources, not palaeoclimate clues.

http://www.sciencedirect.com/science/article/pii/S0277379110000429 Quaternary Science Reviews Volume 29, Issues 15 — 16, July 2010, Pages 1757 — 1778 Special Theme: Arctic Palaeoclimate Synthesis (PP. 1674 - 1790)

Terrestrial palaeoclimate reconstructions based on botanical proxies (pollen and seed productivity, stomatal frequency) do not account for plant physiological response to low atmospheric CO2 levels.

Nevertheless the result appears to provide a more realistic global picture than Royer / Veizer, consistent with the standard view of Cretaceous palaeoclimate ³.

Our results also provide a potential explanation of persistent palaeoclimate results showing solar influence on regional or local climate indicators.»

Here we present a stricter approach, to improve intercomparison of palaeoclimate sensitivity estimates in a manner compatible with equilibrium projections for futureclimate change.

Many palaeoclimate studies have quantified pre-anthropogenic climate change to calculate climate sensitivity (equilibrium temperature change in response to radiative forcing change), but a lack of consistent methodologies produces awide range of estimates and hinders comparability of results.

By Amber Bentley (Aged 11) In just 16 pages, this wonderful book covers the structure of the atmosphere, solar radiation, the water cycle, clouds, fronts, convection, air pressure, air masses, the global atmospheric circulation, making weather observations, forecasting, synoptic charts, hurricanes, regional climate, palaeoclimates and anthropogenic climate change.

Ecological tree line history and palaeoclimate — review of megafossil evidence from the Swedish Scandes Leif Kullman Article first published online: 2 JAN 2013

I also learned more about palaeoclimate and this reinforced my skepticism about catastrophe.

Jones et al., 2016 http://www.nature.com/nclimate/journal/v6/n10/full/nclimate3103.html «Most observed trends [over the 36 - year satellite data] are not unusual when compared with Antarctic palaeoclimate records of the past two centuries.

Nature has a very detailed discussion of these «holes» in climate science (regional climate forecasts, precipitation forecasts, aerosols and palaeoclimate data).

Her research interests include identifying and understanding variations and trends in Australian climate extremes; investigating the role of multi-decadal scale climate variability in the Australian region; and characterising pre-instrumental climate variations in Australia and Antarctica using palaeoclimate data.

http://www.journals.royalsoc.ac.uk/content/h844264320314105/ «There are many interesting palaeoclimate studies that suggest that solar variability had an influence on pre-industrial climate.

Accounting for this results in recent historical estimates for TCR and ECS that are more consistent with constraints based on palaeoclimate data and process - based constraints from modern climatology.

Your point 4: «The early onset of sustained, significant warming in palaeoclimate records and model simulations suggests that greenhouse forcing of industrial - era warming commenced as early as the mid-nineteenth century and included an enhanced equatorial ocean response mechanism.

Possible implications of the results for sensitivities derived from GCMs and palaeoclimate data are suggested.

Co-author Gerrit Lohmann, who leads the Wegener Institute's palaeoclimate dynamics group, said: «Using the simulations performed with our climate model, we were able to demonstrate that the climate system can respond to small changes with abrupt climate swings.

Posted by Quirin Schiermeier Categories: Biosphere feedbacks, GHG emissions, In the News, Ocean science, Palaeoclimate, Quirin Schiermeier, Recent contributors

Quoting from a paper that was accepted: «Many palaeoclimate records from the North Atlantic region show a pattern of rapid climate oscillations, the so - called Dansgaard — Oeschger events, with a quasi-periodicity of ∼ 1,470 years for the late glacial period» http://www.nature.com/articles/nature04121

Evidence from palaeoclimate records suggests that this circulation has changed dramatically in the past, and there is concern that it could be disrupted in the future.

While present in palaeoclimate records, the drivers behind 20 - year climate variability are poorly understood.

Nature has singled out four areas — regional climate forecasts, precipitation forecasts, aerosols and palaeoclimate data — that some say deserve greater open discussion, both within scientific circles and in the public sphere.

Stolen e-mails have revealed no scientific conspiracy.To the denialists, the scientists» scathing remarks about certain controversial palaeoclimate reconstructions qualify as the proverbial «smoking gun»: proof that mainstream climate researchers have systematically conspired to suppress evidence contradicting their doctrine that humans are warming the globe.

I'm not eliding weather modeling and decadal forcing processes that interact with the hydrosphere — palaeoclimate reflects everything, radiative forcing included, but it remains arguably worse understood, and hence harder to backcast than recent climate.

The results have implications for how we interpret the impact of global warming on the hydrological cycle and its extremes, and may help to explain why palaeoclimate drought reconstructions based on tree - ring data diverge from the PDSI - based drought record in recent years9, 10.

If non-CO2 GHGs such as N2O and CH4 increase with global warming at the same rate as in the palaeoclimate record and atmospheric chemistry simulations [122], these other gases provide approximately 25 % of the greenhouse forcing.

Posted by Anna Barnett Categories: AGU Chapman conference on Abrupt Climate Change, Anna Barnett, Climate prediction, Palaeoclimate

Smith, A., Wynn, P., Barker, P., Leng, M., Noble, S., & Stott, A. (2016) Cave monitoring and the potential for palaeoclimate reconstruction from Cueva de Asiul, Cantabria (N. Spain).

DOI: 10.5038 / 1827 - 806X.45.1.1928 Cave monitoring and the potential for palaeoclimate reconstruction from Cueva de Asiul, Cantabria (N. Spain)

17 Jun 2009 18:17 BST Posted by Anna Barnett Category: AGU Chapman conference on Abrupt Climate Change, Anna Barnett, Ocean science, Palaeoclimate

The evidence from surface temperature observations is strong: The observed warming is highly significant relative to estimates of internal climate variability which, while obtained from models, are consistent with estimates obtained from both instrumental data and palaeoclimate reconstructions.

Palaeoclimate studies show that differences in the manner in which the Earth orbited the Sun during the Last Interglacial are sufficient to explain the higher temperatures over most parts of the Northern Hemisphere, particularly due to greater axial tilt and eccentricity compared with the present day orbital configuration.

«Several important caveats must be borne in mind when using tree - ring data for palaeoclimate reconstructions.

The goal of PAGES» LandCover6k Working Group is to use pollen, archaeological and historical data to provide information on past land cover and land use change that can be used to evaluate and improve Anthropogenic Land - Cover Change (ALCC) scenarios for palaeoclimate modelling and the study of land - use as a climate forcing.

Both terrestrial and marine palaeoclimate proxies (Thompson, 1991; Dowsett et al., 1996; Thompson and Fleming, 1996) show that high latitudes were significantly warmer, but that tropical SSTs and surface air temperatures were little different from the present.

Hansen and his colleagues summarise the challenge as follows: «If humanity wishes to preserve a planet similar to that on which civilisation developed and to which life on earth is adapted, palaeoclimate evidence and ongoing climate change suggest that CO2 will need to be reduced from its current 385ppm [parts per million] to at most 350ppm.»

the figures in the above were based on: «Deriving global climate sensitivity from palaeoclimate reconstructions» Hoffert and Covey, Nature Vol 360, 10th December 1992.

In using AOGCM output in this way, it is important not only to demonstrate that these unforced simulations do not drift significantly (Osborn, 1996), but also to evaluate the extent to which model estimates of low - frequency variability are comparable to those estimated from measured climates (Osborn et al., 2000) or reconstructed palaeoclimates (Jones et al., 1998).

A combination of numerical models, palaeoclimate data and modern observations indicated that ocean saltiness was key to understanding it.