Sentences with phrase «isotopic evidence»

Geochemical, biomarker, and isotopic evidence suggests that the end - Permian was characterized by extreme oceanic anoxia that may have led to hydrogen sulfide buildup and mass extinction.

From the European Association of Geochemistry New isotopic evidence supporting moon formation via Earth collision with planet - sized body A new series of measurements of oxygen isotopes provides increasing evidence that the Moon formed from the collision of the Earth with another large, planet - sized astronomical body, around 4.5 billion years ago.

I also have some general questions regarding isotopic evidence from pre-historic times.

Anyone who insists otherwise (that it comes from the ocean — despite the isotopic evidence, budget and direct measurements of increasing ocean carbon) is living in cloud - cuckoo land.

u M. H. Engel and S. A. Macko, «Isotopic Evidence for Extraterrestrial Non-Racemic Amino Acids in the Murchison Meteorite,» Nature, Vol.

u A. J. T. Jull et al., «Isotopic Evidence for a Terrestrial Source of Organic Compounds Found in Martian Meteorites Allan Hills 84001 and Elephant Moraine 79001,» Science, Vol.

Isotopic evidence for dietary ecology of late Neandertals in North - Western Europe.

The influx of nomadic populations into east - central Europe in the fifth century AD may have caused enormous political upheaval and documented episodes of violence, but isotopic evidence shows people finding strategies to mitigate and perhaps even to benefit from these changes by modifying their subsistence economies.»

The anatomical and isotopic evidence of Ar.

«Most of Earth's water was likely present before the moon - forming giant impact: Oxygen isotopic evidence for accretion of Earth's water before a high - energy moon - forming giant impact.»

We would think that if an ice sheet covered the oceans it would have had an impact on marine production or photosynthesis and we find no carbon isotopic evidence for this.

We did not find isotopic evidence that a global ice sheet impacted overall marine productivity.

Not exact matches

Wang and Jacobsen now report isotopic differences between lunar and terrestrial rocks that provide the first experimental evidence that can discriminate between the two leading models for the Moon's origin.

[Ralph F. Keeling et al., Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis]

The evidence, including isotopic analysis, shows that the Philistines were a motley crew of immigrants, possibly pirates, who hailed from many ports, bringing pigs from Europe and donkeys in caravans from Egypt.

The combination of geological and taphonomic evidence, the assemblage of small - mammal and avian fossils, and the taxonomic and isotopic compositions of remains from larger mammals indicate that Aramis was predominantly a woodland habitat during Ar.

The evidence comes from an isotopic analysis of 39 species of trees ranging from Inuvik, Northwest Territories, in Canada to Maricao, Puerto Rico.

Despite comparatively intense bombardment by large impactors, chemical and radio - isotopic trace evidence of what appears to be biologically processed carbon in Earth's oldest surviving rocks — from western Greenland's Isua greenstone belt that are as old as 3.85 billion years — suggest that self - replicating, carbon - based microbial life became well developed during Earth's first billion years of existence.

Evidence from isotopic data on Early Holocene bison and other large herbivores in northern Europe.

This talk provides an overview and tour of the findings from Curiosity, featuring spectacular high definition images, tantalizing mineralogical evidence for fresh water, and atmospheric isotopic measurements indicative of an ancient climate different from today.

Evidence for ocean - wide cooling during the Oligocene exists mostly in isotopic proxies.

In the subtropical Himalayas, there is evidence from ice - core isotopic data and from nearby stations for unusual 20th century warming [Thompson et al, 2003].

The anthropogenic influence on atmospheric CO2 is about as solid as science gets, supported by multiple lines of evidence — simple accounting, ocean acidification, ocean CO2 increasing at the surface (by Salby it would have to be decreasing), decreasing atmospheric O2, isotopic balances, etc..

A second line of evidence showing the human origin of increased atmospheric CO2 is its isotopic composition.

«THE stable carbon isotopic (13C / 12C) record of twentieth - century tree rings has been examined1 - 3 for evidence of the effects of the input of isotopically lighter fossil fuel CO2 (δ 13C ~ -25 ‰ relative to the primary PDB standard4), since the onset of major fossil fuel combustion during the mid-nineteenth century, on the 13C / 12C ratio of atmospheric CO2 (δ 13C ~ -7 ‰), which is assimilated by trees by photosynthesis.

Consider the facts: the climate system is indicated to have left the natural cycle path; multiple lines of evidence and studies from different fields all point to the human fingerprint on current climate change; the convergence of these evidence lines include ice mass loss, pattern changes, ocean acidification, plant and species migration, isotopic signature of CO2, changes in atmospheric composition, and many others.

I thought one could get other evidence on these matters by looking at the isotopic composition of the CO2 and also by looking at the correlation between CO2 changes and change in O2.

The best evidence for the collision theory is the identical isotopic composition of Earth and Moon.