Sentences with phrase «isotope data from»

We use isotope data from Zachos et al. [4], which are improved over data used in our earlier study [5], and we improve our prescription for separating the effects of deep ocean temperature and ice volume in the oxygen isotope record as well as our prescription for relating deep ocean temperature to surface air temperature.

A new database brings together water isotope data from many sources, providing an integrated resource for studying changes in Earth's hydroclimate over the past 2,000 years.

Thus recent events described in AGW denier's blogs are following the same pattern of strange events in the past, including the effort to hide xenon isotope data from the 1995 Galileo probe of Jupiter:

>... there are still ways of discovering the temperatures of past centuries,... tree rings... Core samples from drilling in ice fields... historical reconstruction... coral growth, isotope data from sea floor sediment, and insects, all of which point to a very warm climate in medieval times.

Here we present coupled high - resolution carbon - and sulfur - isotope data from four European OAE 2 sections spanning the Cenomanian — Turonian boundary that show roughly parallel positive excursions.

The researchers used the measured temperatures from these two sites and the isotope data from the ice core from the overlapping time period (a method called «scaling») to quantitatively reconstruct earlier temperature variations.

Strontium isotope data from the Danube Gorges in the north - central Balkan show Europe's first farmers were immigrants.

This interpretation was based on water isotope data from central Greenland ice cores.

If Trenberth, Abraham and Gleick wanted to protect the integrity of climate science, they would ask why NASA hid isotopes data from the 1995 Galileo probe of Jupiter (finally released at press conference in 1998 [1]-RRB- that confirmed 1975 - 1983 findings [2 - 5]:

Not exact matches

In order to determine its origin, Italian scientists took a tiny sample from the blade and compared the proportion of lead isotope — a kind of «finger print» of the ore deposits which remains unchanged in any objects subsequently made from the ore — with the corresponding data from numerous mineral deposits in Europe and the entire Mediterranean region.

J. You / Science; Data: «Climatic signals in multiple highly resolved stable isotope records from Greenland,» Vinther et al, 3 November 2009; «Norse Greenland settlement,» Dugmore et al., 2007; «Human diet and subsistence patterns in Norse Greenland AD c. 980 — AD c. 1450,» Arneborg et al. 2012

It is measurable in terms of oxygen and carbon isotope ratios and was compared to «environmental archive» data from other parts of the earth.

Data from the GPS units helped confirm that the conclusions they drew from feather isotopes were accurate.

Not Ernö Rubik's latest toy, but the data from a four - year experiment to measure the half - life of the rare radioactive isotope silicon - 32.

The paleoclimate data, which included mainly changes in the oxygen isotopes of the calcium carbonate deposits, were then compared to similar records from other caves, ice cores, and sediment records as well as model predictions for water availability in the Middle East and west central Asia today and into the future.

Analysis of the stable isotope control data was funded in part by a grant from the Fishmongers» Company, one of London's medieval Livery Companies, which retains responsibility for quality control at London's Billingsgate fish market.

As for the geochemical data, it is based on Mg / Ca in foraminifera, alkenone unsaturation in sediments and some sparse data from other techniques such as Ca isotopes, clumped isotopes and TEX86.

The scientists behind the research, from Europe and North America, didn't get their data from a magical ancient pH - sensing prototype, but by analyzing isotopes from algae that grew amongst sampled coral.

It basically says that ringwidth is a function of: age trend + climate signal + endogenous (local) disturbances + exogenous (standwide) disturbances + unexplained variation Basically, this concept also underlies all other dendro proxies, be it maximum latewood density or stable isotope ratios, even though there are variations, e. g. age trend in density data is treated differently from ring width data).

The isotopic data evaluated above is derived from the fractionation of the naturally occuring stable isotopes of Carbon, 12 and 13.

The CO2 level comes from half a dozen different ice core analyses, while the temperature data come from marine sediments, pollen analyses, isotopes, corals etc..

The evidence that the current rises of both CO2 and CH4 are anthropogenic are overwhelming (from isotope data, O2 data, ocean data, emission inventories etc.).

Sunspot observations (going back to the 17th century), as well as data from isotopes generated by cosmic radiation, provide evidence for longer - term changes in solar activity.

Carbon isotope data (obtainable in biological materials such as tree rings that can extend back long before the atomic bomb explosion in 1945) demonstrates that atmospheric CO2 has exhibited a reduction in the C14 / C12 ratio commensurate with a rise in total CO2 concentration to an extent indicating that the additional carbon coming from any postulated unidentified source (e.g., outside of deforestation) must have been lacking in C14.

Individual model parameterizations were constrained by paleontological data, and the overall modeled relationship between global temperature and sea level matched well against records from four previous warm periods: preindustrial, the last interglacial, marine isotope stage 11, and the mid-Pliocene.

Like the data used right through 0.02 to 66 My, the Freidrich et al collection comprises stable oxygen isotope ratios from the shells of tiny bottom - dwelling, deep - water marine organisms (benthic foraminifera).

«The solar and volcanic forcings we use are derived from reconstructions based on proxy data and are therefore also subject to considerable uncertainties, although recent explosive volcanic eruptions are likely to have cooled climate, and independent records of solar activity levels inferred from the cosmogenic isotope 10Be (43) and geomagnetic records (44) provide support to reconstructions (22, 45) that show generally increasing solar activity during the 20th century (12).»

We studied a high - resolution multiproxy data set, including magnetic susceptibility (MS), CaCO3 content, and stable isotopes (δ18O and δ13C), from the stratigraphic interval covering the uppermost Maastrichtian and the lower Danian, represented by the pelagic limestones of the Scaglia Rossa Formation continuously exposed in the classic sections of the Bottaccione Gorge and the Contessa Highway near Gubbio, Italy.

This is not isotope data, as one usually sees from ice cores.

Early TRL projects focused on establishing long tree - ring records from temperature - sensitive boreal forest locations in North American for studies of global change, using dendrochronologically dated wood, to investigate the value of stable isotope ratios in cellulose as paleo - thermometers and developing the necessary computer software for processing the data.

Isotopes of carbon and oxygen were sampled on an annual time scale while all environmental data was finer - grained, ranging from half - hourly to monthly.

My analysis of the isotope data indicates that about one third of the CO2 accumulation is from organic sources and two - thirds from inorganic.

This is a similar value to the ~ 5 years found from 13C / 12C carbon isotope mass balance calculations of measured atmospheric CO2 13C / 12C carbon isotope data by Segalstad (1992); the ~ 5 years obtained from CO2 solubility data by Murray (1992); and the ~ 5 years derived from CO2 chemical kinetic data by Stumm & Morgan (1970).

An examination of the data from: i) measurements of the fractionation of CO2 by way of Carbon - 12 and Carbon - 13 isotopes; ii) the seasonal variations of the concentration of CO2 in the Northern Hemisphere; and iii) the time delay between Northern and Southern Hemisphere variations in CO2, raises questions about the conventional explanation of the source of increased atmospheric CO2.

The modulation potential used in the calculations is based on the composite of data determined from the cosmogenic isotope records of 10Be and a neutron monitor.

While there is obviously ongoing «skeptic» interest in a Holocene perspective, such commentary (e.g. recent WUWT posts) is far too often limited to a Northern Hemisphere (Greenland) perspective and, in particular, to the problematic Cuffey - Clow temperature reconstruction from GISP2 (which ends in 1855, though GISP2 isotope data is available to 1987).

I have repeatedly pointed out (in several places including WUWT) that (1) ice core data are useful because they indicate CO2 concentration and isotope - derived temperature data from the same trapped gas bubbles but (2) ice core data are NOT a direct indication of anything because (2a) different ice cores provide different indications and (2b) other proxies (e.g. stomata data) provide different indications to those of the ice cores and to each other.

Although a previous estimate based on this approach yielded a MAT of approximately — 5 °C, additional information from oxygen isotopes in mosses at the site allowed us to calculate isotopic enrichment in the cellulose of fossil trees, thereby reducing assumptions and increasing the precision of our MAT estimates (see the Data Repository).

Schmidt, G.A., 1999: Forward modeling of carbonate proxy data from planktonic foraminifera using oxygen isotope tracers in a global ocean model.

Isotope Data Suggests Fossil Fuels Not to Blame for Increase Methane bubbles up from swamps and rivers, belches from volcanoes, rises from wildfires, and seeps from the guts of cows and termites (where is it made by microbes).

The three evidences of the United Nations Intergovernmental Panel on Climate Change (IPCC), that the apparent contemporary atmospheric CO2 increase is anthropogenic, is discussed and rejected: CO2 measurements from ice cores; CO2 measurements in air; and carbon isotope data in conjunction with carbon cycle modelling.

The researchers were able to discern agricultural methane from other sources of methane by looking at the gas» isotopic signatures — or the ratio of various carbon isotopes — using data from atmospheric monitoring stations around the world.

The scientists initially determined the rate of the LIS collapse using «radiocarbon dates of organic matter and marine shells, cosmogenic dates from the surface of boulders, and the composition of isotopes in marine sediment cores», but then the scientists also used a state - of - the art climate model to see if its results would bear out the paleoclimate data.

Hegerl et al. (2006) used a mixture of 14 regional series, of which only 3 were not made up from tree ring data (a Greenland ice O isotope record and two composite series, from China and Europe, including a mixture of instrumental, documentary and other data).

Their research, published in Philosophical Transactions of the Royal Society B, examined a wide range of published data arising from satellite imagery, charcoal records in sediments and isotope - ratio records in ice cores, to build up a picture of wildfire in the recent and more distant past.

The main panel 1 data is from stable oxygen isotope measurements from the shells of macroscopic marine organisms («fossil shells»), collected by Veizer et al (1999), as re-interpreted by Royer et al (2004).