The depth in the ocean where calcium carbonate dissolves at a faster rate than it is deposited is called the calcite compensation depth (CCD). At present this depth is approximately 4,500 meters (14,700 feet) with some variation between and within ocean basins. Because the CCD is linked to ocean acidity, which is, in turn, linked to atmospheric carbon dioxide concentrations and, hence, to global climate, it is important for scientists to understand the impact of possible changes in its depth.
In the current issue of Nature, URI Graduate School of Oceanography (GSO) visiting scientist Helen Coxall describes how the deepening of the CCD in the Pacific Ocean correlated to global cooling approximately 34 million years ago, when the first significant permanent ice sheets appeared on Antarctica. Other members of the scientific team include Paul Wilson, Southampton Oceanography Center, UK, Heiko Pälike and Jan Backman, University of Stockholm, Sweden, and Caroline H. Lear, Rutgers University, New Jersey.
"This event 34 million years ago marks the transition from a warm ’greenhouse’ climate state, when atmospheric carbon dioxide levels were naturally high and there was no or very little ice at the poles, to the cold glaciated climate state of the modern world that was characterized by lower carbon dioxide," said Coxall. "It is therefore equivalent to global warming in reverse. The results of our study are crucial to the understanding of how climate change works, especially how rapidly major changes in ice-sheet growth and sea level rise and fall occur under altered conditions of atmospheric carbon dioxide."
Lisa Cugini | EurekAlert!
Treatment of saline wastewater during algae utilization
14.05.2019 | Jacobs University Bremen gGmbH
Plastic gets a do-over: Breakthrough discovery recycles plastic from the inside out
07.05.2019 | DOE/Lawrence Berkeley National Laboratory
Physicists at the University of Basel are able to show for the first time how a single electron looks in an artificial atom. A newly developed method enables them to show the probability of an electron being present in a space. This allows improved control of electron spins, which could serve as the smallest information unit in a future quantum computer. The experiments were published in Physical Review Letters and the related theory in Physical Review B.
The spin of an electron is a promising candidate for use as the smallest information unit (qubit) of a quantum computer. Controlling and switching this spin or...
Engineers at the University of Tokyo continually pioneer new ways to improve battery technology. Professor Atsuo Yamada and his team recently developed a...
With a quantum coprocessor in the cloud, physicists from Innsbruck, Austria, open the door to the simulation of previously unsolvable problems in chemistry, materials research or high-energy physics. The research groups led by Rainer Blatt and Peter Zoller report in the journal Nature how they simulated particle physics phenomena on 20 quantum bits and how the quantum simulator self-verified the result for the first time.
Many scientists are currently working on investigating how quantum advantage can be exploited on hardware already available today. Three years ago, physicists...
'Quantum technologies' utilise the unique phenomena of quantum superposition and entanglement to encode and process information, with potentially profound benefits to a wide range of information technologies from communications to sensing and computing.
However a major challenge in developing these technologies is that the quantum phenomena are very fragile, and only a handful of physical systems have been...
Working group led by physicist Professor Ulrich Nowak at the University of Konstanz, in collaboration with a team of physicists from Johannes Gutenberg University Mainz, demonstrates how skyrmions can be used for the computer concepts of the future
When it comes to performing a calculation destined to arrive at an exact result, humans are hopelessly inferior to the computer. In other areas, humans are...
29.04.2019 | Event News
17.04.2019 | Event News
15.04.2019 | Event News
24.05.2019 | Life Sciences
23.05.2019 | Materials Sciences
23.05.2019 | Materials Sciences