Sentences with phrase «isotope record»

For the Holocene, the cosmogenic isotope records of 10Be from WAIS Divide and 14C for IntCal13 demonstrated that WD2014 was consistently accurate to better than 0.5 % of the age.

Variations in tree ring stable isotope records from northern Finland and their possible connection to solar activity; Ogurtsov et al, 2010, see abstract here.

Evidence from carbon isotope records from both soil carbonates [18]--[20] and biomarkers (n - alkanes) extracted from deep - sea sediments [21] provide clear evidence of a progressive vegetation shift from C3 (∼ trees and shrubs) to C4 (∼ tropical grasses) plants during the Plio - Pleistocene.

Ono, S., J.L. Eigenbrode, A.A. Pavlov, P. Kharecha, D. Rumble, III, J.F. Kasting, and K.H. Freeman, 2003: New insights into Archean sulfur cycle from mass - independent sulfur isotope records from the Hamersley Basin, Australia.

There is the possibility of the presence of a common cause that may have affected the various isotope records (representing both CRF and «climate»), and Veizer does not even mention the possibility that the deposition efficiency of these may be affected by climate itself (e.g. circular reasoning).

We present new high - resolution stable isotope records based on analyses of single planktonic and benthic foraminiferal shells from Ocean Drilling Program Site 690 (Weddell Sea, Southern Ocean), demonstrating that the initial carbon isotope excursion was geologically instantaneous and was preceded by a brief period of gradual surface - water warming.

From 1990 to 2010, the nitrogen isotope record indicates that oxygen content steadily decreased in the area, as expected.

By studying the variations of uranium isotopes recorded in carbonates, the team was able to infer global anoxia occurring throughout the ocean using samples from a single outcrop.

These sediments are dated by magnetic stratigraphy, tuned to the marine isotope record.

Atmospheric methane isotope records covering the Holocene period.

«Oxygen and Carbon Isotope Record of East Pacific Core V19 - 30: Implications for the Formation of Deep Water in the Late Pleistocene North Atlantic.»

Evidence for weathering and volcanism during the PETM from Arctic Ocean and Peri-Tethys osmium isotope records

In contrast, when differences among isotopes records are taken into account and the 14C record corrected for fossil fuel burning, current levels of solar activity are found to be historically high, but not exceptionally so (Muscheler et al., 2007).

``... carbon and oxygen stable isotope records reveal variations in the periods around 100, 11 and 3 years.

Prior to direct telescopic measurements of sunspots, which commenced around 1610, knowledge of solar activity is inferred indirectly from the 14C and 10Be cosmogenic isotope record in tree rings and ice cores, respectively, which exhibit solar related cycles near 90, 200 and 2,300 years.

The researchers note that the emission of fossil fuels into the atmosphere has already changed the carbon cycle in a way that is recorded in carbon isotope records.

«We've resolved some puzzles in the historical timeline and contradictions that existed in the sulfur isotope records,» said Fakhraee.

You wrote that «There is the possibility of the presence of a common cause that may have affected the various isotope records (representing both CRF and «climate»)».

Oxygen isotope records indicate that interglacial periods have typically lasted 10,000 — 15,000 years, and maximum glacial periods were of similar length.

Variations in tree ring stable isotope records from northern Finland and their possible connection to solar activity, Maxim Ogurtsov, 02/2011, Journal of Atmospheric and Solar - Terrestrial Physics, Volume 73, Issues 2 — 3, pp. 383 — 387

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

The continental glaciations of the Pleistocene left signatures on the landscape in the form of glacial deposits and landforms; however, the best knowledge of the magnitude and timing of the various glacial and interglacial periods comes from oxygen isotope records in ocean sediments.

Tree - ring isotope records of tropical cyclone activity.

Using long drill cores and uplifted sections of sea - floor sediments, previous work had analysed such microfossil - based oxygen isotope records from carefully dated sequences.

The new sea - level record was then used in combination with existing deep - sea oxygen isotope records from the open ocean, to work out deep - sea temperature changes.

Their results overcome a basic problem of trying to discern the deep history of ice from bedrock: every time an ice sheet retreats and then grows back, it scours away the bedrock and the isotope record of its own past.

Evidence for approximately contemporaneous global cooling in sediments that do contain YTT glass shards has been found in marine core oxygen isotope records from the South China Sea (3), as have terrestrial carbon isotope and pollen records from Northern India and Bengal (23).

The Early Earth Geochemical and Isotope Record of Serpentinizing Environments from Archean Stichtite (Mg6Cr2 (OH) 16 [CO3] · 4H2O)-- Erik B. Melchiorre, Precambrian Research

Novel precipitation isotope records address a long - standing debate about East Asian cave oxygen isotope records Elizabeth Thomas, Steve Clemens, Tim Herbert, Yongsong Huang, Warren Prell, Jaap Sinninghe - Damsté, Youbin Sun

New evidence of Holocene climate and atmospheric circulation variability, inferred from lacustrine stable isotope records from Gotland, southern Sweden Francesco Muschitiello, Dan Hammarlund, Barbara Wohlfarth

Wang, Lean, and Sheeley (2005) compared a flux transport model with geomagnetic activity and cosmogenic isotope records and to derive a reconstruction of TSI since 1713.