Sentences with phrase «ancient carbon from»
Donald Grayson, an anthropologist at the University of Washington, worries that dates from the site might have been contaminated by ancient carbon from the huge aquifer that sits under much of Florida.
https://www.scientificamerican.com/ Not exact matches
Mark Collard from Simon Fraser University in British Columbia, Canada, and his colleagues studied carbon - 14 dates for ancient bones, wood and cereal grains from locations across Great Britain.
Though carbon dating placed the manuscript in the 13th century, skeptics argued that it was not uncommon for looters to create forgeries on period - correct paper taken from ancient caches.
The rocks surrounding the preserved tissues didn't contain the carbon - rich compounds, further suggesting the chemical remnants stem from preserved soft tissues and not ancient sediments, the team reports online today in Nature.
Researchers have a record of atmospheric carbon dioxide stretching back millions of years thanks to ice cores from Antarctica, which contain trapped gas bubbles, snapshots of ancient air.
Samples of ancient carbon deposits from this era show a marked increase in concentrations of carbon - 12 relative to its heavier isotope carbon - 13, indicating a lot of lighter carbon might have been suddenly released at the time.
Tiny carbon nuggets in meteorites from Mars were formed by cooling magma, not left by ancient alien microbes.
Many researchers are content to follow NASA's lead as it cautiously moves from «following the water» in search of likely habitable or once - habitable environments on Mars to «following the carbon» — that is, looking for chemical traces of ancient life.
Because they are sealed tight, these carbon - filled «mineral bottles» exclude the possibility that the MMC came from ancient life.
The technique relies on the radioactive isotope carbon - 14, whose radioactivity diminishes over time in a predictable manner, allowing researchers to calculate the age of ancient human sites using charcoal from fires or the bones of the prehistoric humans themselves.
This year we head to Nashville to talk about dinosaurs ancient and otherwise, exoplanets, carbon cycling, pictures from Pluto, metallic hydrogen, photon pressure, and methane on Mars, among other things.
Although climate patterns in the future may not exactly mimic those conditions, the period of warming allowed Petrenko to reveal an important piece of the climate puzzle: natural methane emissions from ancient carbon reservoirs are smaller than researchers previously thought.
An ancient archeological find on Triquet Island on B.C.'s Central Coast is adding credence... flakes from the hearth with tweezers and send it in for carbon dating.
And I'd have to say that if I have to save my life by winning an argument with oil men in a bar in Midland, Tex., on this topic, I would go in with some lumps of black mudstone from the ancient rock record, I'd go in with the established figures on our present input of carbon dioxide, and I'd say which bit of this observational science do you guys quarrel with, and why?
This pledge is significant because merely draining peatlands is a major source of carbon emissions from peat oxidation as well as ancient carbon carried away as the water table drops.
«It's working with the short carbon cycle, rather than using carbon from ancient fossil fuels.»
The permafrost is a vast reservoir of ancient carbon, protected from decay by microorganisms simply by its frozen state: it becomes increasingly vulnerable as the world warms, as humans burn fossil fuels and dump ever greater concentrations of carbon dioxide in the atmosphere.
In contrast, fossil fuels come from ancient photosynthesis, thus the carbon released by burning had been stored for ages and thus represents a net addition into the atmosphere.
In 1992, a team from the University of New Mexico reported that ancient soils showed extremely high levels of carbon dioxide 440 million years ago, an age of primitive sea life before the advent of land plants and animals.
Using energy from sunlight - together with the catalytic action of an ancient enzyme called rubisco, the most abundant protein on earth - plants convert carbon dioxide from the air into carbohydrates and other useful molecules.
1950s: Research on military applications of radar and infrared radiation promotes advances in radiative transfer theory and measurements = > Radiation math — Studies conducted largely for military applications give accurate values of infrared absorption by gases = > CO2 greenhouse — Nuclear physicists and chemists develop Carbon - 14 analysis, useful for dating ancient climate changes = > Carbon dates, for detecting carbon from fossil fuels in the atmosphere, and for measuring the rate of ocean turnover = > CO2 greenhouse — Development of digital computers affects many fields including the calculation of radiation transfer in the atmosphere = > Radiation math, and makes it possible to model weather processes = > Models (GCMs)-- Geological studies of polar wandering help provoke Ewing - Donn model of ice ages = > Simple models — Improvements in infrared instrumentation (mainly for industrial processes) allow very precise measurements of atmospheric CO2 = > CO2 greenhouse.
Geophysics and soil science, carbon dating, knowledge of cultural artefacts, stories and other evidence provided from ancient documents and carvings, pollen analysis, human DNA from local populations, etc. — each had evolved in independently of one - another, but would now be combined to deepen any 21st century archaeology's approach to understanding the pot.