An international team of geoscientists believes that carbon dioxide, and not changes in cosmic ray intensity, was the factor controlling ancient global temperatures. The new findings resulted from the researchers inclusion of the oceans changing acidity in their calculations.
"Reviewing the geologic records of carbon dioxide and glaciations, we found that carbon dioxide was low during periods of long-lived and widespread continental glaciations and high during other, warmer periods," says Dr. Dana L. Royer, research associate in geosciences at Penn State. "Previous suggestions that cosmic ray flux correlated better with ancient temperatures than carbon dioxides do not appear true. While cosmic ray flux may be of some climatic significance, it is likely of second-order importance on a multimillion year timescale."
The researchers looked at climate changes that occurred over the past 570 million years. A direct record of global temperature and carbon dioxide exists for the past 100 years and ice cores provide carbon dioxide information for the past 400,000 years. However, for the remainder of the years, there are no direct measurements.
A’ndrea Elyse Messer | EurekAlert!
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University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
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Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
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Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.
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20.04.2018 | Physics and Astronomy