Sentences with phrase «with paleoclimate»

The article also incorrectly equates instrumental surface temperature data that Jones and CRU have assembled to estimate the modern surface temperature trends with paleoclimate data used to estimate temperatures in past centuries, falsely asserting that the former «has been used to produce the «hockey stick graph»».

In the IPCC structure, the science has been led by the UK and US scientists, and they have used modeling as their primary tool and with CO2 as the primary driver of temperature with some paleoclimate analysis coming later.

The problems with the paleoclimate data are well known and will not be summarized here; however, the issue of interest in this context is not the «blade» of the hockey stick, but rather the modes of variability and their magnitude seen in the stick handle.

Comprised of 450 instrumental records from temperature stations sheltered from ocean - air / urbanization / adjustment biases throughout the world, a new 20th / 21st century global temperature record introduced previously here very closely aligns with paleoclimate evidence from tree rings, ice cores, fossil pollen and other temperature proxies.

Idso's calculations for climate sensitivity are greatly at odds with the paleoclimate data; if sensitivity were as small as he proposes, the Milankovic changes in solar forcing wouldn't be enough to kickstart the climb out of an ice age, but this still presupposes AGW, that CO2 emissions will increase the temperature by some amount.

Steve Reynolds (29)-- I'm an amateur with enough background, by now, to compare some of the «regional hydrology» predictions with paleoclimate at times with warm regional temperatures.

Composed of 450 instrumental records from temperature stations sheltered from ocean - air / urbanization / adjustment biases throughout the world, a new 20th / 21st century global temperature record introduced previously here very closely aligns with paleoclimate evidence from tree rings, ice cores, fossil pollen and other temperature proxies.

This range is consistent with paleoclimate estimates.

Since the Economist clearly can't handle ECS, it should stick with Paleoclimate, which is much less murky.

This will facilitate the creation of targeted observational networks, provide test beds for reconstruction methods, and enable comparisons with paleoclimate model simulations.

One of the longest standing Climate Audit issues with paleoclimate reconstructions is ex post decisions on inclusion / exclusion of data, of which ex post decisions on inclusion / exclusion of sites / data in «regional [treering] chronologies» is one important family.

It had nothing to do with paleoclimate or some mistaken belief of yours that CO2 is the only factor in determining climate, in all situations.

Indeed, increasing variability at longer scales actually ties in better with paleoclimate reconstructions than the assumption of averaging out.

It's never been very clear how to reconcile Lindzen's ideas with paleoclimate, for example.

I don't know about Nature and real climatologists, but I was interested in Efficiently constraining climate sensitivity with paleoclimate simulations.

The problem with the paleoclimate ice sheet models is that they do not generally contain the physics of ice streams, effects of surface melt descending through crevasses and lubricating basal flow, or realistic interactions with the ocean.

The findings, published in the journal Nature Communications, show that integrating evidence from historical writings with paleoclimate data can advance both our understanding of how the climate system functions, and how climatic changes impacted past human societies.

Ice Patch Archaeology in Global Perspective: Archaeological Discoveries from Alpine Ice Patches Worldwide and Their Relationship with Paleoclimates.

Not exact matches

Paleoclimate data point to a warm tropical ocean with a clear east - west temperature gradient during the warm climates of the Pliocene and Miocene.

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.

«This will evolve,» Putnam said, as more paleoclimate records emerge and are paired with climate models to «try to see if climate models can reproduce the patterns that we see in those datasets.»

These and other paleoclimate records indicate that rain belts shifted northward along with the thermal equator because of the global heat imbalance.

«This does not necessarily mean that a similar response would happen in the future with increasing CO2 levels, since the boundary conditions are different from the ice age,» added by Professor Gerrit Lohmann, leader of the Paleoclimate Dynamics group at the Alfred Wegener Institute.

«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.»

The committee has prepared a report that, in my view, provides policy makers and the scientific community with a critical view of surface temperature reconstructions and how they are evolving over time, as well as a good sense of how important our understanding of the paleoclimate temperature record is within the overall state of scientific knowledge on global climate change.

The NRC asked the committee to summarize current scientific information on the temperature record for the past two millennia, describe the main areas of uncertainty and how significant they are, describe the principal methodologies used and any problems with these approaches, and explain how central is the debate over the paleoclimate temperature record to the state of scientific knowledge on global climate change.

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.

-- The paleoclimate history gives us trends; as they come up with higher resolution info (ice cores, mud cores, etc) they give us sudden dramatic changes as unexplained fact.

Much more careful studies, in which the actual radiative forcing can be quantified, pretty much show that the paleoclimate record is compatible with the full IPCC range, with both the higher and lower ends appearing less probable.

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.

This is being actively investigated for the current human - caused global warming scenario with models and paleoclimate data.

Our approach is a significant advance on previous models, as we incorporate the lake index as a proxy for local climate, together with regional and global paleoclimate records.

In the response by raypierre - I agree about the problems with simple energy balance model and its lack of spatial representation, but it's tough to fault the authors for the lack of cloud detail, since the science is not up to the task of solving that problem (and doing so would be outside the scope of the paper; very few paleoclimate papers that tackle the sensitivity issue do much with clouds).

Here we use a comprehensive set of paleoclimate indicators: East African Rift lake presence, regional Aeolian flux records from the Arabian Sea, the Mediterranean and the East Atlantic together global benthic foraminifera δ18O with to develop models predicting hominin brain size.

Call that output temperature a signal which goes into box with the CO2 feedback; the output of this second box is the observable temperatures from paleoclimate proxies.

Mike Wallace's talk was about the «National Research Council Report on the «Hockey Stick Controversy»... The charge to the committee, was «to summarize current information on the temperature records for the past millennium, describe the main areas of uncertainty and how significant they are, describe the principal methodologies used and any problems with these approaches, and explain how central is the debate over the paleoclimate record within the overall state of knowledge on global climate change.»

The paleoclimate record and changes underway in the Arctic and on the Greenland and Antarctic ice sheets with only today's warming imply that sea level rise of several meters could be expected.

In contrast, chemistry modeling and paleoclimate records [222] show that trace gases increase with global warming, making it unlikely that overall atmospheric CH4 will decrease even if a decrease is achieved in anthropogenic CH4 sources.

It's a long paper with a long title: «Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2 oC global warming could be dangerous».

As changes in temperature and light can be excluded as reasons for the decline in magnesium concentrations, the researchers interpret it as a clear reaction to ocean acidification — with implications for paleoclimate reconstructions.

Ice core paleoclimate isotope data are indirect indications of temperature (proxies) over millions of years compared to instrumental temperature measurements with high resolution of hours, days and decades.

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 paleoclimate history gives us trends; as they come up with higher resolution info (ice cores, mud cores, etc) they give us sudden dramatic changes as unexplained fact.

Paleoclimate inferences probably don't probe the full span of uncertainy associated with forcing and rate - dependent mechanisms of melt, and the hysteresis associated with ice sheets.

I would suggest you review that literature, e.g. start with the IPCC AR4 chapter (6) on paleoclimate.

Indeed, the paleoclimate record contains numerous examples of ice sheets yielding sea level rise of several meters per century, with forcings smaller than that of the BAU scenario.

Indeed, the paleoclimate community, with help from the various funding agencies, e.g. NSF, NOAA, etc., is actively engaged in work that should extend our knowledge at the relevant temporal resolutions (i.e. decadal) several millennia back in time.

1) paleoclimate reconstructions are reasonably robust 2) paleoclimate reconstructions are in their early days and the conclusions are still a bit tentative 3) paleoclimate reconstructions are nonsense, and 4) paleoclimate reconstructions are the products of a corrupt system engaged in corrupt practices (implictly with corrupt people).