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Unraveling 66 million years of climate history from ocean sediments: study in Science
09/10/2020 - Researchers have analyzed data from deep-sea sediments in order to reconstruct Earth’s climate with an unprecedented temporal resolution. To achieve this, the international team, led by Dr. Thomas Westerhold of MARUM – Center for Marine Environmental Sciences at the University of Bremen and Dr. Norbert Marwan of the Potsdam Institute for Climate Impact Research (PIK), compiled and analyzed a comprehensive dataset obtained from sediment cores from the ocean floor. Innovative statistical methods for studying complex dynamical systems were applied revealing fundamental climate states. They show the deterministic nature of climate changes over very long periods of time. The team’s new climate reference curve have been published in the prestigious journal Science.
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Historical climate fluctuations in Central Europe overestimated due to tree ring analysis: Present warming is extraordinary
09/10/2020 - Tree rings exaggerate, a team of researchers finds. Scientists deduce historical climatic conditions for the past hundreds of years from the width of the annual growth rings of trees. Previous temperature reconstructions from the annual tree rings are however to some extent inaccurate, according to a new study published in Climate Dynamics. Tree rings overstate the natural climatic variations of past centuries. A comparison of data from church and city archives shows that the climate has developed much more evenly. This in turn provides further evidence of how extraordinary modern human-made warming really is.
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Ricarda Winkelmann departs on “Expedition Anthropocene“ on Mount Chimborazo, Ecuador
24/02/2020 – Humans are the defining geological force shaping Earth in our current epoch that has been named the Anthropocene. Across disciplinary boundaries, six members of the 'Junge Akademie', the academy of prominent young scientists and artists from German speaking backgrounds, have departed on an expedition on tracing some of human’s impact onto the environment. 200 years after Alexander von Humboldt, they will climb the Ecuadorian volcano Chimborazo in search of humanity’s footprint in different altitudes and vegetation zones. Besides PIK’s Ricarda Winkelmann, a mathematician glaciologist, the scientists involved come from a great variety of disciplinary backgrounds: biology, chemistry, sound ecology, computer science, and medicine.
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Stronger evidence for a weaker Atlantic overturning
04/11/2018. The Atlantic overturning – one of Earth’s most important heat transport systems, pumping warm water northwards and cold water southwards – is weaker today than any time before in more than 1000 years. Sea surface temperature data analysis provides new evidence that this major ocean circulation has slowed down by roughly 15 percent since the middle of the 20th century, according to a study published in the highly renowned journal Nature by an international team of scientists. Human-made climate change is a prime suspect for these worrying observations.
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