Sentences with phrase «of paleoclimate studies»

Martin, when you have seen enough of these paleoclimate studies having been shown to have major flaws you don't believe any of them until they have been properly audited by someone like Steve McIntyre.

The paleoclimatology community seems to be tightly coupled as indicated by our social network analysis, has rallied around the [Mann] position, and has issued an extensive series of alternative assessments most of which appear to support the conclusions of MBH98 / 99... Our findings from this analysis suggest that authors in the area of paleoclimate studies are closely connected and thus «independent studies» may not be as independent as they might appear on the surface.

And as far as your constant disparagement of all paleoclimate studies goes, it is worthless.

It is conventional honest serious scientists that are already doing what JC wants, and it is the nature of paleoclimate studies the proxy reconstructions will never have the level of credibility of a direct measurement.

Not exact matches

Eelco Rohling, an ocean and climate scientist at the University of Southampton in England, has studied the paleoclimate record going back 50 million years.

To conduct landmark paleoclimate studies from Lake El «gygytgyn in eastern Siberia, geologist Julie Brigham - Grette of the University of Massachusetts, Amherst, relied heavily on Russian collaborators she has partnered with for years.

«With present - day emission rates, it's expected that we'll reach 600 ppm before the end of this century,» says study coauthor Simone Galeotti, a paleoclimate scientist at the University of Urbino in Italy.

«Our study has found evidence to the contrary, suggesting that in fact, the future long - term trend based on paleoclimate reconstructions is likely towards diminishing precipitation, with no relief in the form of increased Mediterranean storms, the primary source of annual precipitation to the region, in the foreseeable future.»

However, studies evaluating model performance on key observed processes and paleoclimate evidence suggest that the higher end of sensitivity is more likely, partially conflicting with the studies based on the recent transient observed warming.

However, the quantitative response to freshwater inputs varies widely among models (Stouffer et al., 2006), which led the CMIP and Paleoclimate Modelling Intercomparison Project (PMIP) panels to design and support a set of coordinated experiments to study this issue (http://www.gfdl.noaa.gov/~kd/CMIP.html and http://www.pmip2.cnrs-gif.fr/pmip2/design/experiments/waterhosing.shtml).

However, values this low are inconsistent with numerous studies using a wide variety of methods, including (i) paleoclimate data, (ii) recent empirical data, and (iii) generally accepted climate models.

Climate model studies and empirical analyses of paleoclimate data can provide estimates of the amplification of climate sensitivity caused by slow feedbacks, excluding the singular mechanisms that caused the hyperthermal events.

A number of major studies looking at paleoclimate data come to the same conclusion.

There are tons of studies — ranging from paleoclimate studies to studies of volcanic effects, etc. that constrain climate response and which generally yield results consistent with the models.

One can temper that with studies of paleoclimate sensitivity, but the ensemble results still should be borne in mind, since doubling CO2 takes us into a climate that has no real precendent in the part of the climate record which has been used for exploring model sensitivity, and in many regards may not have any real precedent in the entire history of the planet (in terms of initial condition and rapidity of GHG increase).

The research drew lessons from paleoclimate studies of the Last Glacial Maximum, the cold peak of the last ice age, that relate to the extent of warmth possible in an era of accumulating greenhouse gases:

- I don't study tree rings at all, so this will be quite naive, but I took a class on paleoclimate (actually with one of your old office - mates, Mathias Vuille) discussing the standarization procedure and why this tends to remove some of the low - frequency variation, though we never got into quantitative detail.

I suspect that there will be considerably more uncertainty attached to this activity than there was to the attribution of climate change to anthropogenic activity — in part because the only guides we really have are the models and paleoclimate studies, both of which are subject to significant uncertainties.

The paleoclimate evidence from this new study supports the attribution of the tropical temperature trend to the ever - increasing greenhouse gas burden in the atmosphere.

Paleoclimate studies of tropical ice cores tend to support the scenario of changes in the tropics propagating northwards, too, not the reverse.

As we have discussed several times elsewhere on this site, studies employing model simulations of the past millennium have been extremely successful in reproducing many of the details evident in paleoclimate reconstructions of this interval as a forced response of the climate to natural (primarly volcanic and solar) and in more recent centuries, anthropogenic, radiative changes.

If you refer to the fact that CO2 levels rise after temperature rises (from paleoclimate sediment core studies, etc.), this MOST CERTAINLY DOES NOT imply anything in the way of causality.

The example of millennial paleoclimate studies emphasises the paucity of this argument, as the expert list is very small.

The occurence of El Niño itself is — as far as science understands the phenomenon, based largely on Pliocene paleoclimate comparisons, even Eocene «clam studies «-- probably not strongly influenced by the trend of global climate warming.

In this study, which was led by Oregan State University, funded by the US National Science Foundation's Paleoclimate Program and just published in Science, researchers used «extensive sea and land surface temperature reconstructions» of around 21,000 years ago — in stead of the (late) Holocene temperature record that is mostly used.

Paleoclimate studies (e.g., Peterson et al. 2000, Haug et al. 2001) and a series of modeling studies starting with Vellinga and Wood (2002), Chiang and Bitz (2005) and Broccoli et al. (2006) have revealed one important driver of ITCZ shifts: differential heating or cooling of the hemispheres shifts the ITCZ toward the differentially warming hemisphere.

The study, «Assessing the Risk of Persistent Drought Using Climate Model Simulations and Paleoclimate Data,» was also co-authored by Julia E. Cole, David M. Meko and Jonathan T. Overpeck of University of Arizona; and Gregory T. Pederson of the U.S. Geological Survey.

But the most critical point to remember, if you are concerned about this for its impact on the validity of AGW theory, is that the fight is over a single study, published eight years ago, focused on paleoclimate.

Answer: The first order of business here is to correct the mischaracterization of this single paleoclimate study as the «foundation» of global warming theory.

The Summary for Policymakers also incorporates, for the first time, information on, inter alia, paleoclimate reconstruction studies, geoengineering, and an emissions - based perspective on drivers of climate change.

On the first sentence stating that the WGI report considers evidence of past and future climate change based on many independent scientific analyses from observations of the climate system, paleoclimate archives, theoretical studies of climate processes, and simulations using climate models, Saudi Arabia proposed clarifying that evidence of future climate change is based on models and simulations only.

Paleoclimate studies may be of a high quality.

Although not part of our study, high - resolution paleoclimate data from the past ~ 130 years have been compiled from various geological archives, and confirm the general features of warming trend over this time interval»

The study uses models, paleoclimate data and modern observations to analyze the impact of ice shed from Antarctic ice shelves and Greenland.

Howard J. Falcon - Lang (2005) «Global climate analysis of growth rings in woods, and its implications for deep - time paleoclimate studies» Paleobiology: Vol.

Scientists involved with the Past Global Changes (PAGES) project have developed goals and recommendations for studying the paleoclimate of the past 2000 years.

We use numerical climate simulations, paleoclimate data, and modern observations to study the effect of growing ice melt from Antarctica and Greenland.

A number of major studies looking at paleoclimate data come to the same conclusion.

However, the separation of char from soot has rarely been applied in paleoclimate studies using sediment analysis, much less in investigations of long - term records of paleo - fires.

Chapter 6 highlights the fact that there are now a large number of different paleoclimate studies which all lead to the same key conclusion that northern hemisphere mean temperatures in recent decades are likely unprecedented in at least a millennial timeframe.

Our analysis is based on about equal parts of information gleaned from paleoclimate studies, climate modeling, and modern observations of ongoing climate changes.

Climate model studies and empirical analyses of paleoclimate data can provide estimates of the amplification of climate sensitivity caused by slow feedbacks, excluding the singular mechanisms that caused the hyperthermal events.

In summary, paleoclimate studies provide one line of evidence that supports an equilibrium climate sensitivity between about 2 and 4.5 °C, and the GWPF justification for dismissing these estimates is weak.

It's just one study of one location JimD and it contradicts virtually every other Holocene paleoclimate study.

However, studies of paleoclimate proxies, such as tree rings and ice cores, have shown that oscillations similar to those observed instrumentally have been occurring for at least the last millennium.

To better understand these discrepancies, a recent study published in Geophysical Research Letters investigates the drivers of changes in deep ocean circulation across a range of modern and Last Glacial Maximum (LGM, ~ 21000 years ago) climate simulations from the latest Paleoclimate Modelling Intercomparison Project (PMIP).

steven mosher Says: August 30th, 2011 at 2:20 pm Marlowe Johnson Says: August 30th, 2011 at 1:30 pm «paleoclimate studies offer very little useful information in relation to the determination of climate sensitivity.»

Although not part of our study, high - resolution paleoclimate data from the past ~ 130 years have been compiled from various geological archives, and confirm the general features of warming trend over this time interval (Anderson, D.M. et al., 2013, Geophysical Research Letters, v. 40, p. 189 - 193; http://www.agu.org/journals/pip/gl/2012GL054271-pip.pdf).

> For example, one of the clear resuls from the IPCC effort is that paleoclimate studies offer very little useful information in relation to the determination of climate sensitivity.

Actually, climate science derives a great deal of understanding of the present climate through its studies of the past, in particular the paleoclimate.