Abrupt climate changes during the marine isotope stage 3 (MIS 3)
Abstract The climate in the North Atlantic Ocean during the Marine Isotope Stage 3 (MIS 3)—roughly between 80,000 years before present (B.P.) and 20,000 years B.P., within the last glacial period—is characterized by great instability, with opposing climate transitions including at least six colder H...
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ftpucargentir:oai:ucacris:123456789/18052 2024-06-09T07:46:51+00:00 Abrupt climate changes during the marine isotope stage 3 (MIS 3) Agosta, Eduardo Andrés Compagnucci, Rosa Hilda 2016 application/pdf https://repositorio.uca.edu.ar/handle/123456789/18052 https://doi.org/10.1007/978-3-319-40000-6_5 eng eng Springer Earth System Sciences Agosta, E.A., Compagnucci, R.H. (2016). Abrupt climate changes during the marine isotope stage 3 (MIS 3). Postprint del capítulo publicado en: Gasparini, G., Rabassa, J., Deschamps, C., Tonni, E. (eds). Marine Isotope Stage 3 in Southern South America, 60 KA B.P.-30 KA B.P. Springer Earth System Sciences. Springer, Cham. doi:10.1007/978-3-319-40000-6_5. Disponible en: https://repositorio.uca.edu.ar/handle/123456789/18052 9783319400006 (online) 9783319399980 (impreso) https://repositorio.uca.edu.ar/handle/123456789/18052 doi:10.1007/978-3-319-40000-6_5 Acceso restringido http://creativecommons.org/licenses/by-nc-sa/4.0/ Gasparini, G., Rabassa, J., Deschamps, C., Tonni, E. (eds). Marine Isotope Stage 3 in Southern South America, 60 KA B.P.-30 KA B.P. Springer Earth System Sciences. Springer, Cham. CAMBIO CLIMATICO OCEANO ATLANTICO ISOTOPOS MARINOS CIRCULACION OCEANICA CIRCULACION ATMOSFERICA Parte de libro 2016 ftpucargentir https://doi.org/10.1007/978-3-319-40000-6_5 2024-05-16T23:37:49Z Abstract The climate in the North Atlantic Ocean during the Marine Isotope Stage 3 (MIS 3)—roughly between 80,000 years before present (B.P.) and 20,000 years B.P., within the last glacial period—is characterized by great instability, with opposing climate transitions including at least six colder Heinrich (H) events and fourteen warmer Dansgaard–Oeschger (D-O) events. Periodic longer cooling cycles encompassing two D-O events and ending in a colder Heinrich episode occurred lasting about 10 to 15 ky each, known as the Bond cycle. Heinrich events occurred less frequently than D-O events. These were recurrent every 1.5 ky on average, while *10 ky elapsed between two H events. Neither of the two types of events is strictly periodical, however. After H events abrupt shifted to warmer climate, the D-O events followed immediately. During an H event, abnormally large amounts of rock debris transported by icebergs were deposited as layers at the bottom of the North Atlantic Ocean. The various theories on the causes include factors internal to the dynamics of ice sheets, and external factors such as changes in the solar flux and changes in the Atlantic Meridional Overturning Circulation (AMOC). The latter is the most robust hypothesis. At certain times, these ice sheets released large amounts of freshwater into the North Atlantic Ocean. Heinrich events are an extreme example of this, when the Laurentide ice sheet disgorged excessively large amounts of freshwater into the Labrador Sea in the form of icebergs. These freshwater dumps reduced ocean salinity enough to slow down deep-water formation and AMOC. Since AMOC plays an important role in transporting heat northward, a slowdown would cause the North Atlantic Ocean to cool. Later, as the addition of freshwater decreased, ocean salinity and deep-water formation increased and climate conditions recovered. During the D-O events, the high-latitude warming occurred abruptly (probably in decades to centuries), reaching temperatures close to interglacial conditions. Even ... Book Part Ice Sheet Labrador Sea North Atlantic Repositorio Institucional UCA (Pontificia Universidad Católica Argentina) 81 106 |
institution |
Open Polar |
collection |
Repositorio Institucional UCA (Pontificia Universidad Católica Argentina) |
op_collection_id |
ftpucargentir |
language |
English |
topic |
CAMBIO CLIMATICO OCEANO ATLANTICO ISOTOPOS MARINOS CIRCULACION OCEANICA CIRCULACION ATMOSFERICA |
spellingShingle |
CAMBIO CLIMATICO OCEANO ATLANTICO ISOTOPOS MARINOS CIRCULACION OCEANICA CIRCULACION ATMOSFERICA Agosta, Eduardo Andrés Compagnucci, Rosa Hilda Abrupt climate changes during the marine isotope stage 3 (MIS 3) |
topic_facet |
CAMBIO CLIMATICO OCEANO ATLANTICO ISOTOPOS MARINOS CIRCULACION OCEANICA CIRCULACION ATMOSFERICA |
description |
Abstract The climate in the North Atlantic Ocean during the Marine Isotope Stage 3 (MIS 3)—roughly between 80,000 years before present (B.P.) and 20,000 years B.P., within the last glacial period—is characterized by great instability, with opposing climate transitions including at least six colder Heinrich (H) events and fourteen warmer Dansgaard–Oeschger (D-O) events. Periodic longer cooling cycles encompassing two D-O events and ending in a colder Heinrich episode occurred lasting about 10 to 15 ky each, known as the Bond cycle. Heinrich events occurred less frequently than D-O events. These were recurrent every 1.5 ky on average, while *10 ky elapsed between two H events. Neither of the two types of events is strictly periodical, however. After H events abrupt shifted to warmer climate, the D-O events followed immediately. During an H event, abnormally large amounts of rock debris transported by icebergs were deposited as layers at the bottom of the North Atlantic Ocean. The various theories on the causes include factors internal to the dynamics of ice sheets, and external factors such as changes in the solar flux and changes in the Atlantic Meridional Overturning Circulation (AMOC). The latter is the most robust hypothesis. At certain times, these ice sheets released large amounts of freshwater into the North Atlantic Ocean. Heinrich events are an extreme example of this, when the Laurentide ice sheet disgorged excessively large amounts of freshwater into the Labrador Sea in the form of icebergs. These freshwater dumps reduced ocean salinity enough to slow down deep-water formation and AMOC. Since AMOC plays an important role in transporting heat northward, a slowdown would cause the North Atlantic Ocean to cool. Later, as the addition of freshwater decreased, ocean salinity and deep-water formation increased and climate conditions recovered. During the D-O events, the high-latitude warming occurred abruptly (probably in decades to centuries), reaching temperatures close to interglacial conditions. Even ... |
format |
Book Part |
author |
Agosta, Eduardo Andrés Compagnucci, Rosa Hilda |
author_facet |
Agosta, Eduardo Andrés Compagnucci, Rosa Hilda |
author_sort |
Agosta, Eduardo Andrés |
title |
Abrupt climate changes during the marine isotope stage 3 (MIS 3) |
title_short |
Abrupt climate changes during the marine isotope stage 3 (MIS 3) |
title_full |
Abrupt climate changes during the marine isotope stage 3 (MIS 3) |
title_fullStr |
Abrupt climate changes during the marine isotope stage 3 (MIS 3) |
title_full_unstemmed |
Abrupt climate changes during the marine isotope stage 3 (MIS 3) |
title_sort |
abrupt climate changes during the marine isotope stage 3 (mis 3) |
publisher |
Springer Earth System Sciences |
publishDate |
2016 |
url |
https://repositorio.uca.edu.ar/handle/123456789/18052 https://doi.org/10.1007/978-3-319-40000-6_5 |
genre |
Ice Sheet Labrador Sea North Atlantic |
genre_facet |
Ice Sheet Labrador Sea North Atlantic |
op_source |
Gasparini, G., Rabassa, J., Deschamps, C., Tonni, E. (eds). Marine Isotope Stage 3 in Southern South America, 60 KA B.P.-30 KA B.P. Springer Earth System Sciences. Springer, Cham. |
op_relation |
Agosta, E.A., Compagnucci, R.H. (2016). Abrupt climate changes during the marine isotope stage 3 (MIS 3). Postprint del capítulo publicado en: Gasparini, G., Rabassa, J., Deschamps, C., Tonni, E. (eds). Marine Isotope Stage 3 in Southern South America, 60 KA B.P.-30 KA B.P. Springer Earth System Sciences. Springer, Cham. doi:10.1007/978-3-319-40000-6_5. Disponible en: https://repositorio.uca.edu.ar/handle/123456789/18052 9783319400006 (online) 9783319399980 (impreso) https://repositorio.uca.edu.ar/handle/123456789/18052 doi:10.1007/978-3-319-40000-6_5 |
op_rights |
Acceso restringido http://creativecommons.org/licenses/by-nc-sa/4.0/ |
op_doi |
https://doi.org/10.1007/978-3-319-40000-6_5 |
container_start_page |
81 |
op_container_end_page |
106 |
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1801376839922352128 |