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News articles about "Isotopes"

Ironing out details of the carbon cycle: Dissolved iron in North Atlantic traced to Sahara desert

Iron is present in tiny concentrations in seawater On the order of a few billionths of a gram in a liter I did a calculation once on a ton of ocean water says Seth John ... - Read More

Ancient Arctic sharks tolerated brackish water 50 million years ago

Sharks were a tolerant bunch some 50 million years ago cruising an Arctic Ocean that contained about the same percentage of freshwater as Louisiana's Lake Ponchatrain does today says a new study involving the University ... - Read More

Team develops a geothermometer for methane formation

Methane is a simple molecule consisting of just one carbon atom bound to four hydrogen atoms But that simplicity belies the complex role the molecule plays on Earth it is an important greenhouse gas is ... - Read More

Modern ocean acidification is outpacing ancient upheaval: Rate may be ten times faster

Some 56 million years ago a massive pulse of carbon dioxide into the atmosphere sent global temperatures soaring In the oceans carbonate sediments dissolved some organisms went extinct and others evolved Scientists have long suspected ... - Read More

Richest marine reptile fossil bed along Africa's South Atlantic coast is dated at 71.5 mya

A new study uses carbon isotope dating to determine the first precise age for this bed and ties the western coast of Africa to 30 million years of global geologic records Paleontologists at Southern Methodist ... - Read More

Approaching the island of stability: Observation of the superheavy element 117

The periodic table of the elements is to get crowded towards its heaviest members Evidence for the artificial creation of element 117 has recently been obtained at the GSI Helmholtz Centre for Heavy Ion Research ... - Read More

Today's Antarctic region once as hot as California, Florida

Parts of ancient Antarctica were as warm as today's California coast and polar regions of the southern Pacific Ocean registered 21st century Florida heat according to scientists using a new way to measure past temperatures ... - Read More

Dust in the wind drove iron fertilization during ice age

Researchers from Princeton University and the Swiss Federal Institute of Technology in Zurich have confirmed that during the last ice age iron fertilization caused plankton to thrive in a region of the Southern Ocean The ... - Read More

Why did humans replace Neanderthals? Paleo diet didn't change, the climate did

Why were Neanderthals replaced by anatomically modern humans around 40 000 years ago One popular hypothesis states that a broader dietary spectrum of modern humans gave them a competitive advantage on Neanderthals Geochemical analyses of ... - Read More

Organic chemical origins in hydrothermal systems

Organic, organic, Organic
Serpentinite hosted hydrothermal systems have been suggested as likely sites for the formation of organic compounds in the abiotic conditions of early Earth that is in the absence of living organisms Such compounds were likely ... - Read More

Water cycle amplifies abrupt climate change

During the abrupt cooling at the onset of the so called Younger Dryas period 12680 years ago changes in the water cycle were the main drivers of widespread environmental change in western Europe Thus the ... - Read More

Ways of the photoelectric effect; How physicists have learned how to select them

In contrast to its apparent simplicity that brought Einstein his Nobel Prize the photoelectric effect when an electron is knocked out from its parent atom by a photon is quite complicated to analyze in general ... - Read More

Deep-sea corals record dramatic long-term shift in Pacific Ocean ecosystem

sea
Long lived deep sea corals preserve evidence of a major shift in the open Pacific Ocean ecosystem since around 1850 according to a study by researchers at the University of California Santa Cruz The findings ... - Read More

Amber provides new insights into the evolution of Earth's atmosphere: Low oxygen levels for dinosaurs

Oxygen
An international team of researchers led by Ralf Tappert University of Innsbruck reconstructed the composition of Earth's atmosphere of the last 220 million years by analyzing modern and fossil plant resins The results suggest that ... - Read More

Breaking Bad's Addictive Chemistry

and a huge part of the show’s appeal As Pinkman exclaims during an episode of the show’s first season “Yeah Science ” Permalink to this article Comment Share ... - Read More

Tapping a valuable resource or invading the environment? Research examines the start of fracking in Ohio

Environment
A new study is examining methane and other components in groundwater wells in advance of drilling for shale gas that's expected over the next several years in an Ohio region Amy Townsend Small a University ... - Read More

Late Cretaceous Period was likely ice-free

Ice
For years scientists have thought that a continental ice sheet formed during the Late Cretaceous Period more than 90 million years ago when the climate was much warmer than it is today Now a University ... - Read More

Ocean fish acquire more mercury at depth

fish, Mercury
Mercury a common industrial toxin is carried through the atmosphere before settling on the ocean and entering the marine food web Now exciting new research from the University of Michigan and the University of Hawai'i ... - Read More

Rocks can restore our climate ... after 300,000 years

A study of a global warming event that happened 93 million years ago suggests that the Earth can recover from high carbon dioxide emissions faster than thought but that this process takes around 300 000 ... - Read More

Cosmochemist May Have Solved Meteorite Mystery

in the cores of the olivine crystals embedded within the chondrules When olivine crystallizes from a liquid of chondrule composition at temperatures of approximately 2 000 degrees Kelvin 3 140 degrees Fahrenheit most sodium remains ... - Read More
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