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Geoscientists reconstruct 6.5 million years of sea level stands

Credit: University of South Florida
TAMPA, Fla. (January 22, 2021)- The pressing concern posed by rising sea levels has created a critical need for scientists to precisely predict how quickly the oceans will rise in coming centuries. To gain insight into future ice sheet stability and sea-level rise, new research from an international team led by University of South Florida geoscientists is drawing on evidence from past interglacial periods when Earth s climate was warmer than today.
Using deposits in the caves of the Mediterranean island of Mallorca, known as phreatic overgrowths on speleothems, to reconstruct past sea level stands, the team was able to determine that the vertical extent of these unique deposits corresponds with the amplitude of the fluctuating water table, said author USF geosciences Professor Bogdan Onac. That determination now is providing scientists with a way to precisely measure past sea levels. ....

Mediterranean Sea , Oceans General , Spanish State , Bogdan Onac , Jacqueline Austermann , Ioana Dumitru , Les Illes Balears , Yemane Asmerom , Victorj Polyak , University Of South Florida , University Of New Mexico , Spanish State Research Agency , National Science Foundation , Columbia University Lamont Doherty Earth Observatory , Columbia University , University Of Balearic , South Florida , Professor Bogdan , New Mexico , Balearic Islands , Pliocene Pleistocene Transition , Pleistocene Transition , Lamont Doherty Earth , Messinian Salinity Crisis , Western Mediterranean , Joaquin Gin ,

UNM scientists, part of international geosciences team, reconstruct 6.5 million years of sea-level stands in the Western Mediterranean

, by investigating samples that are either older or younger than the Pliocene epoch (5.3 to 2.6 million years ago). Using precisely dated cave deposits from several of the Mallorcan caves and applying numerical and statistical models to estimate the corrections for glacial isostatic adjustment and long‐term uplift, they translated the local sea level estimates into global mean sea level (GMSL).
Their results show that during key time events, such as Pliocene–Pleistocene Transition, some 2.6 million years ago, the GMSL stood at 6.4 meters (some 10 meters lower than the warmer Pliocene), whereas during the beginning and the end of the Mid‐Pleistocene Transition the sea level was at −1.1 meter and 5 meters respectively. ....

Spanish State , Jacqueline Austermann , Ioana Dumitru , Les Illes Balears , Oanaa Dumitru , Bogdanp Onac , University Of South Florida , University Of New Mexico , National Science Foundation , Columbia University Lamont Doherty Earth Observatory , Columbia University , Spanish State Research Agency , Research Scientist Victor Polyak , University Of Balearic , New Mexico Distinguished Professor Yemane Asmerom , South Florida , Balearic Islands , Western Mediterranean , Section Samples , Pleistocene Transition , Lamont Doherty Earth , North Pacific , Joaquin Gin , Angel Gin , Illes Balears , New Mexico ,

UNM scientists, part of international geosciences team, reconstruct 6.5 million years of sea-level stands

Considering the pressing concern posed by rising sea levels, a critical need exists to precisely predict how quickly sea level will rise in the next. ....

Spanish State , Jacqueline Austermann , Ioana Dumitru , Les Illes Balears , Oanaa Dumitru , Bogdanp Onac , University Of South Florida , University Of New Mexico , National Science Foundation , Columbia University Lamont Doherty Earth Observatory , Columbia University , Spanish State Research Agency , Research Scientist Victor Polyak , University Of Balearic , New Mexico Distinguished Professor Yemane Asmerom , South Florida , Balearic Islands , Western Mediterranean , Section Samples , Pleistocene Transition , Lamont Doherty Earth , North Pacific , Joaquin Gin , Angel Gin , Illes Balears , New Mexico ,

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