Paleoproductivity and surface water dynamics evolution during the MIS 31 in the Shackleton Site as revealed Coccolithophores
Comunicación oral presenta en EGU General Assembly 2024. Vienna, Austria & Online | 14–19 April 2024. Expedition 397 Scientific Party Marine Isotope 31 Stage (MIS-31) records one of the highest high-latitude precession-paced insolation values of the last 5 million years (Laskar et al., 2004). Ac...
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ftcsic:oai:digital.csic.es:10261/365844 2024-09-15T17:48:46+00:00 Paleoproductivity and surface water dynamics evolution during the MIS 31 in the Shackleton Site as revealed Coccolithophores Flores, José Abel Balestra, Barbara Clark, William Jimenez Espejo, Francisco Jose Kuroda, Junichiro Salgueiro, Emilia Grimalt, Joan O. Herbert, Timothy Bárcena, María Ángeles Abrantes, Fátima Hodell, David Alvarez Zarikian, Carlos A. 2024 http://hdl.handle.net/10261/365844 https://doi.org/10.5194/egusphere-egu24-15648 unknown European Geosciences Union Publisher's version http://dx.doi.org/10.5194/egusphere-egu24-15648 Sí doi:10.5194/egusphere-egu24-15648 EGU General Assembly (2024) http://hdl.handle.net/10261/365844 open comunicación de congreso 2024 ftcsic https://doi.org/10.5194/egusphere-egu24-15648 2024-08-19T14:06:11Z Comunicación oral presenta en EGU General Assembly 2024. Vienna, Austria & Online | 14–19 April 2024. Expedition 397 Scientific Party Marine Isotope 31 Stage (MIS-31) records one of the highest high-latitude precession-paced insolation values of the last 5 million years (Laskar et al., 2004). According to this configuration, some studies (e.g. Raymo et al., 2006) predicts a +20 m eustatic sea-level rise for this time interval, reflecting significant retreat of some combination of the West Antarctic Ice Sheet, marginal East Antarctic ice, and the Greenland Ice Sheet, and consequently significant variations in the ocean and climate dynamics at global scale. In this study we show data of variability in the coccolithophore assemblage from IODP Site 1385 (Shackleton Site, IODP 339 and IODP 397) in the interval ca. 1 Ma (close to the Jaramillo event). These sediments are sensitive recorders of North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW) oscillations, which makes this site a significant location to test the interhemispheric connection hypotheses. Peaks in abundance of Gephyrocapsa (<3mm), as well as in other Noelarhaddaceae such as Reticulofenestra asanoi and other morphotypes (equivalent with minimum differences at total coccoliths recorded), were interpreted as a signal of paleoproductivity, revealing strong changes during MIS 31. Alternatively, cold water indicators (Coccolithus pelagicus ) or the census of Helicosphaera carteri l(inked to stratification processes) are considered, showing an alternative pattern along the studied interval. After the refinement of the age-model, these data should be compared with other records in close or remote areas (e.g. Flores and Sierro, 2007, Maiorano et al., 2009), to understand the relevance of this interval, particularly sensible in the Antarctic environment, where a potential relevant melting peak was suggested (Scherer et al., 2009). Preliminary results (Jiménez Espejo et al., 2013) reveal a distinct turnover during MIS 31 and different ... Conference Object Antarc* Antarctic Greenland Ice Sheet NADW North Atlantic Deep Water North Atlantic Digital.CSIC (Spanish National Research Council) |
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Digital.CSIC (Spanish National Research Council) |
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Comunicación oral presenta en EGU General Assembly 2024. Vienna, Austria & Online | 14–19 April 2024. Expedition 397 Scientific Party Marine Isotope 31 Stage (MIS-31) records one of the highest high-latitude precession-paced insolation values of the last 5 million years (Laskar et al., 2004). According to this configuration, some studies (e.g. Raymo et al., 2006) predicts a +20 m eustatic sea-level rise for this time interval, reflecting significant retreat of some combination of the West Antarctic Ice Sheet, marginal East Antarctic ice, and the Greenland Ice Sheet, and consequently significant variations in the ocean and climate dynamics at global scale. In this study we show data of variability in the coccolithophore assemblage from IODP Site 1385 (Shackleton Site, IODP 339 and IODP 397) in the interval ca. 1 Ma (close to the Jaramillo event). These sediments are sensitive recorders of North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW) oscillations, which makes this site a significant location to test the interhemispheric connection hypotheses. Peaks in abundance of Gephyrocapsa (<3mm), as well as in other Noelarhaddaceae such as Reticulofenestra asanoi and other morphotypes (equivalent with minimum differences at total coccoliths recorded), were interpreted as a signal of paleoproductivity, revealing strong changes during MIS 31. Alternatively, cold water indicators (Coccolithus pelagicus ) or the census of Helicosphaera carteri l(inked to stratification processes) are considered, showing an alternative pattern along the studied interval. After the refinement of the age-model, these data should be compared with other records in close or remote areas (e.g. Flores and Sierro, 2007, Maiorano et al., 2009), to understand the relevance of this interval, particularly sensible in the Antarctic environment, where a potential relevant melting peak was suggested (Scherer et al., 2009). Preliminary results (Jiménez Espejo et al., 2013) reveal a distinct turnover during MIS 31 and different ... |
format |
Conference Object |
author |
Flores, José Abel Balestra, Barbara Clark, William Jimenez Espejo, Francisco Jose Kuroda, Junichiro Salgueiro, Emilia Grimalt, Joan O. Herbert, Timothy Bárcena, María Ángeles Abrantes, Fátima Hodell, David Alvarez Zarikian, Carlos A. |
spellingShingle |
Flores, José Abel Balestra, Barbara Clark, William Jimenez Espejo, Francisco Jose Kuroda, Junichiro Salgueiro, Emilia Grimalt, Joan O. Herbert, Timothy Bárcena, María Ángeles Abrantes, Fátima Hodell, David Alvarez Zarikian, Carlos A. Paleoproductivity and surface water dynamics evolution during the MIS 31 in the Shackleton Site as revealed Coccolithophores |
author_facet |
Flores, José Abel Balestra, Barbara Clark, William Jimenez Espejo, Francisco Jose Kuroda, Junichiro Salgueiro, Emilia Grimalt, Joan O. Herbert, Timothy Bárcena, María Ángeles Abrantes, Fátima Hodell, David Alvarez Zarikian, Carlos A. |
author_sort |
Flores, José Abel |
title |
Paleoproductivity and surface water dynamics evolution during the MIS 31 in the Shackleton Site as revealed Coccolithophores |
title_short |
Paleoproductivity and surface water dynamics evolution during the MIS 31 in the Shackleton Site as revealed Coccolithophores |
title_full |
Paleoproductivity and surface water dynamics evolution during the MIS 31 in the Shackleton Site as revealed Coccolithophores |
title_fullStr |
Paleoproductivity and surface water dynamics evolution during the MIS 31 in the Shackleton Site as revealed Coccolithophores |
title_full_unstemmed |
Paleoproductivity and surface water dynamics evolution during the MIS 31 in the Shackleton Site as revealed Coccolithophores |
title_sort |
paleoproductivity and surface water dynamics evolution during the mis 31 in the shackleton site as revealed coccolithophores |
publisher |
European Geosciences Union |
publishDate |
2024 |
url |
http://hdl.handle.net/10261/365844 https://doi.org/10.5194/egusphere-egu24-15648 |
genre |
Antarc* Antarctic Greenland Ice Sheet NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Greenland Ice Sheet NADW North Atlantic Deep Water North Atlantic |
op_relation |
Publisher's version http://dx.doi.org/10.5194/egusphere-egu24-15648 Sí doi:10.5194/egusphere-egu24-15648 EGU General Assembly (2024) http://hdl.handle.net/10261/365844 |
op_rights |
open |
op_doi |
https://doi.org/10.5194/egusphere-egu24-15648 |
_version_ |
1810290290562433024 |