Temperature records show past volcanic activity, current warming trends.
Scientists have used a 600-year-old sea sponge to record a record temperature in the North Atlantic Ocean, revealing past volcanic activity as well as current global warming trends from carbon dioxide emissions from other heat trapping gases into the Earth’s atmosphere.
A research team led by the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Sciences, using geochemical proxies, has restored the 600-year-old Atlantic Ocean record from a sclerotic skeleton.Ceratoporella nicholsoni:)
The basketball-sized sclerosponge was submerged more than 430 feet (133 meters) above the river in Exuma Sound, Bahamas, by Peter Swart, lead author of the study, professor of marine geology at UM Rosenstiel School. Sclerosponges are slow-growing marine organisms with soft outer bodies, hard limestone skeletons that record high ocean temperatures, and climatic conditions. Although individuals may be 1000-2000 years old, their distribution is poorly documented due to recruitment difficulties and costs.
“Temperatures in the Atlantic fluctuate between different schedules, including multi-deciles; it affects the climate in North America, Europe, Africa and Africa,” Swart said. “Temperature recovery over these 600 years can help us understand how the climate has changed in the past so that scientists can better predict how conditions may change in the future. «
To understand that modern tools can adapt to changes in the environment, scientists are turning to long-lived marine organisms, such as Sclerosponges, which record environmental conditions in their skeletons.
“Predicting future temperatures in the Atlantic և can help us better prepare for hurricanes as well as fluctuations in summer precipitation in Florida,” said lead author Amanda W. White, a graduate of UM Rosenstiel School.
“This post highlights both the potential role of volcanic eruptions in North Atlantic air temperature, both before and after industrialization, and the growing contribution of man-made factors such as greenhouse gases and air pollution to twentieth-century temperatures,” said Lisa Murphy. Co-author of the study դաս Lecturer in the Department of Atmospheric Sciences, Rosenstiel School.
The samples were dated using uranium thorium by scientists from the German GEOMAR Helmholtz – Zentrum für Ozeanforschung Kiel.
The study, entitled “Observational-Model Evidence for the Role of the Volcanic Force to Drive Atlantic Multimodal Variability Over the Last 600 Years,” was published in the Journal of the American Geophysical Society. Geophysical research lettersThe authors of the study are: Peter K. Swart, Amanda J. Waite, Jeremy M. Cllavans, Amy C. Clement and Lisa N. Murphy from UM Rosenstiel School and Volker Liebetrau, and Anton Eisenhauer from GEOMAR Helmholtz – Zentrum für Ozeanforschung Kiel in Germany
Reference. “Exemplary Evidence for Observing the Role of Volcanic Force in Driving the Atlantic Multimodal Variability Over the Last 600 Years” by Amanda J. Waite, Jeremy M. Slavans, Amy C. Clement, Lisa N. Murphy, Volker Liebetrau, Anton Eisenhauer, Ralph We. Weger և Peter C. Swart, November 16, 2020 Geophysical research letters,
DOI: 10.1029 / 2020GL089428:
Research funding is as follows: Sclerosponge was awarded the NOAA / NURP 95-340044 Award to D. McNeill, M. Grammer and PK Swart.
This work was supported by the NSF (OCE 9819147 և OCE 0823636) PK Swart Awards.
A. Clementine, Klav. Clavansin և L. Murphy was supported by NSF Climate and Large Scale Dynamics and Paleo Perspectives climate change grants (AGS 1703076 և AGS 1735245).