Sentences with word «geochemist»

The new analysis «is an elegant example of how to use the geochemistry of a fossil to infer the behavior and movement of an ancient creature,» says Henry Fricke, an isotope geochemist at Colorado College in Colorado Springs.

«We're at 387 now and we're going up at two ppm per year,» says geochemist Wallace Broecker of Columbia University's Earth Institute.

«The results show unequivocally that most of the increase in CO2 between 7000 and 500 years ago is due to release of carbon from the ocean, not to axe - wielding humans,» says Eric Steig, an isotope geochemist at the University of Washington in Seattle.

He is an organic geochemist with specific expertise in geomicrobiology and palaeoclimate reconstruction, with an emphasis on developing and applying molecular proxies for ancient carbon dioxide concentrations and temperatures.

New research by geochemists at Woods Hole Oceanographic Institution, published June 8 in the Proceedings of the National Academy of Sciences, is the first to show that methane formation does not occur during the relatively quick fluid circulation process, despite extraordinarily high hydrogen contents in the waters.

That is the headline finding of an international team, led by geochemists from Trinity College Dublin, who discovered that large impacts can be followed by intense, long - lived, and explosive volcanic eruptions.

ScienceNOW reported in a story yesterday that Columbia University geochemist Wallace Broecker had quit as research coordinator for Biosphere 2, the ecology lab in the Arizona desert.

Moon rocks contain a tiny bit more of the rare isotope oxygen - 17 than do the rocks on Earth, say geochemists who measured oxygen using very precise methods.

He presented the idea at the Goldschmidt conference of geochemists in Florence, Italy, today.

On the flip side, Jeffrey Bada, an organic geochemist at the Scripps Institution of Oceanography in San Diego, can not imagine soft tissue surviving millions of years.

«You build up too much free gas, and then you have an overpressured column,» says Gerald Dickens, a marine geochemist at Rice University who went to Hydrate Ridge on a drill ship in 2002.

«Things could change overnight,» agrees Daniel Schrag, a Harvard University geochemist who studies both ancient climate and carbon sequestration.

«The early work with this new tool is promising,» said Dr. Kevin Rosso, a PNNL geochemist on the study.

University of California, Santa Barbara geochemist David Valentine, a researcher involved with the 2011 study, is skeptical that the methane munchers died off before gobbling up the gas.

PRECIOUS METAL Geochemists explore platinum, gold and other rare elements that are attracted to iron to understand how Earth's core formed billions of years ago.

But last May, University of Utah geochemist Thure Cerling revealed that P. boisei had unexpected dining habits.

As a result, ocean waters deeper than 500 meters (about 1,600 feet) have a large but still unrealized absorption capacity, said Scripps geochemist Ralph Keeling.

Taylor, a planetary geochemist at Purdue University and self - described «lunatic,» had examined hundreds of rocks that astronauts had brought back since first landing on the moon three years earlier.

The work, led by geochemist Ken Farley of the California Institute of Technology (Caltech), could not only help in understanding the geologic history of Mars but also aid in the search for evidence of ancient life on the planet.

Encouraged that she had found a new way to trace impact events, she joined with geochemist Robert Poreda of the University of Rochester in New York, who had helped develop the technique to find trapped fullerene gases, to look for buckyballs at the sites of mass extinctions.

An agenda for the unpublicized event viewed by ScienceInsider listed top researchers who have studied geoengineering as speakers, including geochemist Ken Caldeira of the Carnegie Institution for Science and astrophysicist Gregory Benford of the University of California, Irvine.

The study, whose authors also include WHOI geochemists Jeffrey Seewald, Christopher German, and Sean Sylva, indicates that methane at the Von Damm vent field was created by a reaction between CO2 and water trapped for thousands of years within cooling volcanic rocks deep within Earth's crust.

Carlo Barbante (left), an analytical chemist from the University of Venice in Italy, and Andrew Mitchell, a microbial geochemist from Aberystwyth University in England, sport white Tyvex suits on the Antarctic Ice Sheet.

Columbia University geochemists Peter Kelemen and Juerg Matter calculated that a single rock formation in Oman could store up to 10 percent of all human - generated carbon emitted in a year.

«There is a positive note in that the world persisted, it did not go down in flames, it has a way of self - correcting and righting itself,» says University of Utah geochemist Gabe Bowen, lead author of the study published today in the journal Nature Geoscience.

Geochemists on the drill ship, on the expedition led by Suess, had cut slices from several drill cores with sterile knives, capped them, flushed them with nitrogen to banish all oxygen, sealed them in cans, and sent them to Oban.

«It's an interesting and plausible hypothesis,» says geochemist Richard April of Colgate University in Hamilton, New York, who was not involved with the study.

But according to Dr. Robert Moran, a hydrogeologist and geochemist whose clients included the mining industry for more than 40 years, this makes little difference.

One of these colleagues, geochemist David Des Marais, suggested that Farmer apply for an NRC Senior Fellowship at Ames; he did so in 1991.

A new study aims to debunk that idea by surveying atmospheric chemists who specialize in condensation trails and geochemists working on atmospheric deposition of dust and pollution.

This idea began percolating nearly a century ago when geochemist Vladimir Vernadsky of Russia suggested that human changes to the soil constituted «a new phenomenon in geological history.»

The picture has emerged over several years, but in work presented last week at the 2018 Lunar and Planetary Science Conference in The Woodlands, Texas, a group of German geochemists reported clinching evidence.

The picture has emerged over several years, but in work presented last week at the Lunar and Planetary Science Conference here, a group of German geochemists reported clinching evidence.

«There are things we have to decide,» says University of Tennessee geochemist Lawrence Taylor, a leading moon scientist.

RETURNING from vacation in the summer of 2002, NASA geochemist Dr Everett Gibson learned that a 275 - kilogram safe had vanished from his lab.

«We have a limited amount of water in this country to use for everything from drinking water to raising livestock, and global population and demand is growing,» said Sandia geochemist Pat Brady.

A study of the cores led by University of Utah geochemist Gabe Bowen found that carbon emissions to the atmosphere during a global warming period almost 56 million years ago were more similar to today's human - caused climate change than previously was believed.

Proposed by Caltech geochemist Don Burnett, the idea was to put a spacecraft in orbit between the sun and Earth to collect particles of solar wind — electrically charged atoms from the sun's atmosphere blown outward through the solar system.

A couple of decades later, geochemists found that amino acids, the building blocks of proteins, could survive in fossils for millions of years.

Even the fullerene tracers that were once warmly received have come under attack, because geochemist Ken Farley of Caltech in Pasadena found no helium in P - T rocks from Meishan when he tried to replicate Becker's work.

In 2009, Canadian geochemist Graham Pearson and his graduate student John McNeill were analyzing a pile of diamonds that formed at least 325 miles underground hundreds of millions of years ago.

The older data were analyzed by SIO geochemist Charles David Keeling, the father of Ralph Keeling, also an SIO scientist and a member of the research team.

UCLA geochemists have found evidence that life likely existed on Earth at least 4.1 billion years ago — 300 million years earlier than previous research suggested.

He and his coauthor, geochemist Stephen Mojzsis, also of the University of Colorado, found that if early bacteria were living more than 4 kilometers (2.5 miles) down, the impacts could have helped life by creating more hot - water - filled cracks for microbes to inhabit.

«It's a very comprehensive piece of work,» says geochemist Stuart Gilfillan of the University of Edinburgh in the United Kingdom, who was not involved in the study.

«Tosca et al. are making some very good points,» writes planetary geochemist Jeffrey Kargel of the University of Arizona, Tucson, in an e-mail, but «they carry it too far.»

«This is one of the first studies to show that soils are beginning to respond positively to declines in emissions of SO2 and NOx,» says Chris E. Johnson, an environmental geochemist at Syracuse University.

Since 2006, when Nobel Prize — winning geochemist Paul Crutzen called for climate engineering research, scientific societies, a number of high - level panels and prominent lawmakers have endorsed federal funding for the field.