Sentences with phrase «global reconstruction of»

Using instead the 4.0 + / -0.8 C warming estimate from the Annan and Hargreaves (2013; doi: 10.5194 / cp -9-367-2013) global reconstruction of temperature changes at the LGM implies an even lower ECS best estimate, of 1.56 C.

Finally, a global reconstruction of sea level (Jevrejeva et al. in Geophys Res Lett 35: L08715, 2008) and a reconstruction of the North Atlantic Oscillation (NAO) index (Luterbacher et al. in Geophys Res Lett 26:2745 — 2748, 1999) are analyzed and compared: both sequences cover about three centuries from 1700 to 2000.

«Spatially resolved global reconstructions of annual surface temperature patterns over the past six centuries are based on the multivariate calibration of widely distributed high - resolution proxy climate indicators.

All of this work will soon be advanced enormously by a major new collaborative international working group led by Kathleen Morrison, Land Use 6000 (LU6K), which aims to provide empirical global reconstructions of land use and land cover over the past 6000 years and earlier as part of the Land Cover 6000 project (LC6K) of PAGES.

If you accept them then you must accept that the global reconstructions of temperature from proxies all indicate that today's warming is unusual and more extreme.

Not exact matches

The study was based on reconstructions and climate modelling of a period of global warming 56 million years ago.

A new study linking paleoclimatology — the reconstruction of past global climates — with historical analysis by researchers at Yale and other institutions shows a link between environmental stress and its impact on the economy, political stability, and war - fighting capacity of ancient Egypt.

With a global seismic tomography model that makes use of seismic waves to map the internal structure of the Earth's mantle, Schellart and Spakman were able to identify the fossil slab structure below central and south - eastern Australia at a location and depth predicted by the reconstructions.

Building on this study, the team intend to produce a new reconstruction of global ice volume across the last glacial cycle, which will help to validate their proposition that certain boundaries can define windows of instability within the climate system.

A LAB reconstruction of the 1918 flu virus, cause of the deadliest global pandemic ever recorded, is showing frightening similarities with H5N1, the bird flu that killed dozens of people across east Asia last year.

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 reconstruction produced by Dr. Mann and his colleagues was just one step in a long process of research, and it is not (as sometimes presented) a clinching argument for anthropogenic global warming, but rather one of many independent lines of research on global climate change.

Incidentally, as I see it, your reconstruction of Manns data showing the 15th century to be warmer than now is even more damming than Manns original construct, as it indicates a gradual decline in global temperatures until 1850, before human influence reversed that trend.

Some studies have attempted to estimate the statistical relationship between temperature and global sea level seen in the period for which tide gauge records exist (the last 2 - 3 centuries) and then, using geological reconstructions of past temperature changes, extrapolate backward («hindcast») past sea - level changes.

Nature published a great new reconstruction of global temperatures over the past 2 million years today.

The «zoo» of global sea level curves calculated from tide gauge data has grown — tomorrow a new reconstruction of our US colleagues around Carling Hay from Harvard University will appear in Nature (Hay et al. 2015).

He helped coordinate an international consortium that assembled «A global multiproxy database for temperature reconstructions of the Common Era», which was published on 11 July in the journal Scientific Data.

(And the 800 BCE date is not because the rate of global sea - level rise was probably faster before then, but simply that the reconstruction quality isn't good enough before then to have the same level of confidence.)

Global temperature reconstructions also tend to dampen the amplitude of these smaller events.

It's a cultural response to its own environment that acts as a metaphor for a bigger global geopolitical crisis point, suggesting a new period of reconstruction, a digitally - conscious Modernism as a form of survivalism for the post-truth era.

The result of Ghost of Concordia is a shared gaze: The digital reconstruction and documentation of an environment that you can't find on Google Maps, the captured motion of people — now digital Ghosts - that were once global and are now nowhere to be found, surrounded by virtual artifacts that called Cea's attention for their ambiguity within the narrative of the newsreel.

The result was an aesthetic paradigm shift that would impact the international art scene during the years of reconstruction following the global devastation of WWII.

They vary from an attempt at reconstruction (When Attitudes Become Form, Venice, 2013), which entails the impossible endeavor of providing the viewer with an authentic experience in the form of an archival documentation exhibition with the aim of updating our (own) past (Recollections), to a much more multifaceted or «corrected» image of the original, such as Jens Hoffman's Other Primary Structures, which also included sculptures by artists working in the 1960s in Asia, Latin America, the Middle East, Eastern Europe, and Africa, and which reexamined the exhibition of 1966 from a global point of view.

Organized by Independent Curators International, «Beyond Preconceptions» attempts a reconstruction of context as only grand - scale exhibitions such as «Out of Actions» (2000) at Museum of Contemporary Art, Los Angeles, or the Queens Museum's «Global Conceptualism: Points of Origin, 1950s - 1980s» (1999) can achieve.

Proxy - based reconstructions of hemispheric and global surface temperature variations over the past two millennia Michael E. Mann, Zhihua Zhang, Malcolm K. Hughes, Raymond S. Bradley, Sonya K. Miller, Scott Rutherford, and Fenbiao Ni PNAS September 9, 2008 vol.

Given the uncertainties, the SH and global reconstructions are compatible with the possibility of warmth similar to the most recent decade during brief intervals of the past 1,500 years...»

This question presumes that the inputs for such a reconstruction are obtainable; it also presumes that particular aspects of the previous ice age (s) are relevant to global warming scenarios.

So does this sort of phenomenon affect the paleo - reconstruction of global SSTs?

However, atmospheric CO2 content plays an important internal feedback role.Orbital - scale variability in CO2 concentrations over the last several hundred thousand years covaries (Figure 5.3) with variability in proxy records including reconstructions of global ice volume (Lisiecki and Raymo, 2005), climatic conditions in central Asia (Prokopenko et al., 2006), tropical (Herbert et al., 2010) and Southern Ocean SST (Pahnke et al., 2003; Lang and Wolff, 2011), Antarctic temperature (Parrenin et al., 2013), deep - ocean temperature (Elder eld et al., 2010), biogeochemical conditions in the Northet al., 2008).

As far as this historic period is concerned, the reconstruction of past temperatures based on deep boreholes in deep permafrost is one of the best past temperature proxies we have (for the global regions with permafrost — polar regions and mountainous regions)-- as a signal of average temperatures it's even more accurate than historic direct measurements of the air temperature, since the earth's upper crust acts as a near perfect conservator of past temperatures — given that no water circulation takes place, which is precisely the case in permafrost where by definition the water is frozen.

For the past 120 years the proxy reconstruction nicely matches the Jevrejeva et al. (2006) and Church & White (2006) global tide gauge reconstructions — see above and Fig. 6 of paper.)

Oerlemans's reconstruction of global temperatures (largely from mid latitude glaciers) is entirely independent of the much talked about temperature records from other paleoclimate proxy data (e.g. Moberg and others, Mann and others, Crowley and others).

[Response: There was little (or even no) choice here since we needed a global land + ocean reconstruction (i.e. not just northern hemisphere, and not just land — both of these would have been useless).

The famous conclusion of the IPCC, «The balance of evidence suggests that there is a discernible human influence on global climate», does not depend on any reconstruction for the past millennium.

Even putting aside the OHC data and fingerprinting, there is absolutely no evidence in model simulations (or in prevailing reconstructions of the Holocene), that an unforced climate would exhibit half - century timescale global temperature swings of order ~ 1 C. I don't see a good theoretical reason why this should be the case, but since Judith lives on «planet observations» it should be a pause for thought.

Why are there at all different reconstructions of the global sea level history?

Firstly paleoclimate is not driven in any way by CO2 but by the proximity of planet Earth to supernova which Svensmark has helpfully converted into a nice graph that is a remarkable fit to global temperature reconstructions.

If one takes the MBH98 / 99 reconstruction as base, the variation in the pre-industrial period was ~ 0.2 K, of which less than 0.1 K (in average) from volcanic eruptions, the rest mostly from solar (I doubt that land use changes had much influence on global temperatures).

But I'm less concerned now that I have read the paper over more carefully, because I think that Figure 1a and 1b give a pretty good sense of what features of higher resolution reconstructions (specifically, our ’08 global reconstruction which is shown) are potentially captured.

However, since their methodology suppresses most of the high frequency variability, one needs to be cautious when making comparisons between their reconstruction and relatively rapid events like the global warming of the last century.

In November 2005, Representative Sherwood Boehlert (R - NY) requested that the National Academy of Sciences (NAS) convene a panel of independent experts to investigate Professor Mann's seminal 1999 reconstruction of the global surface temperature over the past 1,000 years.

As I demonstrated in my previous article, CET is considered by many to be some sort of reasonable indicator for global temperatures, although as Hubert Lamb remarked on temperatures derived from trends and reconstructions in general;

Finds a MASLT is about 1 mm / yr in global sea level reconstructions that is more than half of the total observed sea level trend during the XXth century

I know all this has been covered before, but I think everyone should keep in mind that the statistical argument in the end mostly boils down to the pre-eminence of a handful of high altitude North American tree - ring samples in the reconstruction of global temperature over the last thousand years.

However, models would need to underestimate variability by factors of over two in their standard deviation to nullify detection of greenhouse gases in near - surface temperature data (Tett et al., 2002), which appears unlikely given the quality of agreement between models and observations at global and continental scales (Figures 9.7 and 9.8) and agreement with inferences on temperature variability from NH temperature reconstructions of the last millennium.

As I said in my reply to Wegman, ordinarily I would agree with him that science shouldn't be conducted through blogs, but in the case of climate science an opinion about global warming in general, or the validity of multiproxy reconstructions or climate models in particular seems to constitute for some a political viewpoint that must be either trumpeted from the rooftops or suppressed by any means possible regardless of its scientific merit.

In that paper, we discussed all 19 of the proxy - based global temperature reconstructions of the last millennium, including the Mann «hockey stick».

Here's a superimposition of numerous global, hemispheric, and regional temperature reconstructions for the last 2,000 years, together with an average.

-LSB-...] Freedom of Information Act request for thousands of emails from Dr. Michael Mann, creator of the disputed «hockey stick» reconstruction of historical global temperatures.

Using the same method that I had used earlier for the same years on both data sets, I compared the total numbers of sunspots in post-1975 years to the 200 years pre-1975, and discovered a surprising result, given all the hype: the GSN reconstruction makes no discernable difference over the SIDC number post-1975 as pertaining to the solar cause of global warming.