Sentences with phrase «years global reconstructions»

A cursory analysis of the past 10,000 years global reconstructions quickly shows that there has not been a single significant abrupt warming event.

«However, Fig. 15 and the associated uncertainties discussed in Section 3.4 show that long term estimates of time variable sea level acceleration in 203 year global reconstruction are significantly positive, which supports our previous finding (Jevrejeva et al., 2008a), that despite strong low frequency variability (larger than 60 years) the rate of sea level rise is increasing with time.»

«long term estimates of time variable sea level acceleration in 203 year global reconstruction are significantly positive, which supports our previous finding (Jevrejeva et al., 2008a), that despite strong low frequency variability (larger than 60 years) the rate of sea level rise is increasing with time.»

Not exact matches

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

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.

In recent years, S&T Fellows have helped to set up a digital library for Iraqi scientists, provided key data to support the Endangered Species Act, contributed to a federal task force on global climate change adaptation, and worked on recovery and reconstruction projects in Haiti just weeks after the country's devastating January 2010 earthquake.

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

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.

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...»

Titus (re: # 36), you're seriously offering us schematics from 30 years ago when there was no global or even hemispheric reconstructions available, a schematic which is well known to be inaccurate and totally obsolete...

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).

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.)

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.

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.

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.

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

«Our LST reconstruction is qualitatively simlar to NH temperature reconstructions (Fig 3a), implying that Tanganyika LST largely followed global trends in temperature during the past 1500 years, much as it has in the past half - century.»

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.

- ARAMATE (The reconstruction of ecosystem and climate variability in the north Atlantic region using annually resolved archives of marine and terrestrial ecosystems)- CLIM - ARCH-DATE (Integration of high resolution climate archives with archaeological and documentary evidence for the precise dating of maritime cultural and climatic events)- CLIVASH2k (Climate variability in Antarctica and Southern Hemisphere in the past 2000 years)- CoralHydro2k (Tropical ocean hydroclimate and temperature from coral archives)- Global T CFR (Global gridded temperature reconstruction method comparisons)- GMST reconstructions - Iso2k (A global synthesis of Common Era hydroclimate using water isotopes)- MULTICHRON (Constraining modeled multidecadal climate variability in the Atlantic using proxies derived from marine bivalve shells and coralline algae)- PALEOLINK (The missing link in the Past — Downscaling paleoclimatic Earth System Models)- PSR2k (Proxy Surrogate ReconstructiGlobal T CFR (Global gridded temperature reconstruction method comparisons)- GMST reconstructions - Iso2k (A global synthesis of Common Era hydroclimate using water isotopes)- MULTICHRON (Constraining modeled multidecadal climate variability in the Atlantic using proxies derived from marine bivalve shells and coralline algae)- PALEOLINK (The missing link in the Past — Downscaling paleoclimatic Earth System Models)- PSR2k (Proxy Surrogate ReconstructiGlobal gridded temperature reconstruction method comparisons)- GMST reconstructions - Iso2k (A global synthesis of Common Era hydroclimate using water isotopes)- MULTICHRON (Constraining modeled multidecadal climate variability in the Atlantic using proxies derived from marine bivalve shells and coralline algae)- PALEOLINK (The missing link in the Past — Downscaling paleoclimatic Earth System Models)- PSR2k (Proxy Surrogate Reconstructiglobal synthesis of Common Era hydroclimate using water isotopes)- MULTICHRON (Constraining modeled multidecadal climate variability in the Atlantic using proxies derived from marine bivalve shells and coralline algae)- PALEOLINK (The missing link in the Past — Downscaling paleoclimatic Earth System Models)- PSR2k (Proxy Surrogate Reconstruction 2k)

«A peer - reviewed paper [Krivova et al.] published in the Journal of Geophysical Research finds that reconstructions of total solar irradiance (TSI) show a significant increase since the Maunder minimum in the 1600's during the Little Ice Age and shows further increases over the 19th and 20th centuries... Use of the Stefan - Boltzmann equation indicates that a 1.25 W / m2 increase in solar activity could account for an approximate.44 C global temperature increase... A significant new finding is that portions of the more energetic ultraviolet region of the solar spectrum increased by almost 50 % over the 400 years since the Maunder minimum... This is highly significant because the UV portion of the solar spectrum is the most important for heating of the oceans due to the greatest penetration beyond the surface and highest energy levels.

published in the Journal of Geophysical Research finds that reconstructions of total solar irradiance (TSI) show a significant increase since the Maunder minimum in the 1600's during the Little Ice Age and shows further increases over the 19th and 20th centuries... Use of the Stefan - Boltzmann equation indicates that a 1.25 W / m2 increase in solar activity could account for an approximate.44 C global temperature increase... A significant new finding is that portions of the more energetic ultraviolet region of the solar spectrum increased by almost 50 % over the 400 years since the Maunder minimum... This is highly significant because the UV portion of the solar spectrum is the most important for heating of the oceans due to the greatest penetration beyond the surface and highest energy levels.

All anyone should have to do to satisfy themselves that the climate system is NOT unstable at a macro level is to review the 500 - thousand - year reconstruction of global temperature.

Overall, the PAGES 2k paper provides the best overall reconstruction of local and global surface temperature changes over the past 1,000 — 2,000 years.

So, are you going to provide us with the first hemispherical or global temperature reconstruction going back more than 2000 years?

Their two main results are a confirmation that current global surface temperatures are hotter than at any time in the past 1,400 years (the general «hockey stick» shape, as shown in Figure 1), and that while the Medieval Warm Period (MWP) and Little Ice Age (LIA) are clearly visible events in their reconstruction, they were not globally synchronized events.

Their temperature reconstruction shows global temperatures peaked several years ago with current temperatures being noticeably cooler by comparison.

And, when you have fully two cycles of a 60 year oscillation evident within the higher accuracy, directly measured data spanning the previous century, and it appears all over the place in proxy reconstructions over thousands of years as well... Then, by gum, there's a 60 year quasi-cyclic phenomenon influencing global temperatures.

Small wonder, then, that the modelers» computer «reconstructions» of the planet's past climate conveniently wiped out the well - documented three - centuries - long Medieval Warming Period, as well as the subsequent 500 years of Little Ice Age — nor is it surprising that their terrifying computer prognostications in the IPCC's 2001 Third Assessment failed to predict the next decade's absence of any global warming trend at all.

The paper, an extension of a study published earlier that year in Nature magazine, included a reconstruction of global temperature variation over many centuries.

My position is the following: 1) the extent of past human interference with global climate is likely somewhat exaggerated, 2) the dangers of future human - induced climate change are greatly exaggerated (for example, I heard Ira Flatow a couple of weeks ago talking about the East coast being under water in 50 years — which is complete piffle), 3) the numerical global climate do a poor job of past reconstruction and are unlikely to be very reliable in predicting the consequences of future human activity.

Regionally, there may have been places that exhibited notable warmth — Europe, for example — but all global proxy reconstructions agree it is warmer now, and the temperature is rising faster now, than at any time in the last one or even two thousand years.

NIPCC intermediate report just provides a synthesis of recent (2009 and 2010) paleoclimate reconstructions, confirming scientifically what historical records had taught us for years (and even decades) i.e. that MWP was a global warm period...

Figure 2: Global mean temperature anomalies 1900 to 2100 relative to the period 1961 to 1990 for the A1B (red lines) and A2 (magenta lines) scenarios and for three different solar forcings corresponding to a typical 11 - year cycle (solid line) and to a new Grand Minimum with solar irradiance corresponding to recent reconstructions of Maunder - minimum irradiance (dashed line) and a lower irradiance (dotted line), respectively.

The paper discusses reconstructions of global deep ocean temperature, sea level, surface temperature, and climate sensitivity going back thousands to millions of years.

Phase relationships between hemispheric and global climate reconstructions from tree - rings and the solar irradiance time series indicate a lag of ~ 10 years (range, 5 - 20 years), with solar changes leading temperature anomalies, consistent with both climate modeling and other climate and solar variability studies (Eichler et al., 2009; Breitenmoser et al., 2012; Anchukaitis et al., 2017).

In fact, the assumed 60 year cycle which was the basis of the L&S model doesn't even show up in Loehle's own millennial global temperature reconstruction - a glaring contradiction.

A number of new millennial - scale geomagnetic field reconstructions have been published over the last years, based on improved global archeo - and paleomagnetic data compilations.

To compare our Standard 5X5 reconstruction with modern climatology, we aligned the stack's mean for the interval 510 to 1450 yr B.P. (where yr B.P. is years before 1950 CE) with the same interval's mean of the global Climate Research Unit error - in - variables (CRU - EIV) composite temperature record (2), which is, in turn, referenced to the 1961 — 1990 CE instrumental mean (Fig. 1A).»

«To examine the sensitivity of our main conclusions to this missing variability, we use the 390 Mann et al. reconstruction (2) to add the amount of high - frequency variability exhibited in 391 global temperature over the past 1500 years to the Holocene stack (1) as white noise and (2) as 392 red noise.

«To compare our Standard5 × 5 reconstruction with modern climatology, we aligned the stack's mean for the interval 510 to 1450 yr B.P. (where yr B.P. is years before 1950 CE) with the same interval» smean of the global Climate Research Unit error - in - variables (CRU - EIV) composite temperature record (2), which is, in turn, referenced to the 1961 — 1990 CE instrumental mean (Fig. 1A).»

All reconstructions for the last 1000 or 2000 years show nature doesn't cause much global warming or cooling — compared to 1.7 C.

To test the validity of their approach, the team compared its reconstructions with tide - gauge measurements from North Carolina for the past 80 years, and global tide - gauge records for the past 300 years.

40:30 Ice core records, low - latitudes, like hockey stick 42:00 Glacier lengths, hockey stick 42:50 Boreholes, corals 45:50 Forcings, CO2, CH4 47:00 Sunspots 49:00 Volcanoes 50:00 Other reconstructions, new studies 51:40 Spaghetti curve, look at envelope 54:15 Put spaghetti with hockey stick error bars 56:50 30 - year averages warmest, 400 years likely, 1000 years plausible 58:15 end of talk 58:50 MWP likely varied globally 01:01:50 LIA seems more global 01:03:00 Does it have anything to do with AGW?

Until about 2000, the dominant reconstruction of the last 1000 years of global temperatures was similar to that shown in this chart from the 1990 IPCC report:

An index used in many climate change detection studies is global mean surface temperature, either as estimated from the instrumental record of the last 140 years, or from palaeo - reconstructions.

We present the first, to our knowledge, estimate of global sea - level (GSL) change over the last ∼ 3,000 years that is based upon statistical synthesis of a global database of regional sea - level reconstructions.

Global surface temperature (anomaly from 1960 - 1990 average) reconstructions for the past 9000 years (Marcott et al. 2013), for the past 2,000 years (PAGES 2k), and observed for the past 150 yrs (Instrumental data from HadCRUT4) and the last 30 years (star).

How unprecedented those changes were became clear in an earlier 2012 study, the most comprehensive scientific reconstruction of global temperatures over the past 11,000 years ever made.