Paleoenvironmental changes in the Pacific sector of the Southern Ocean (Antarctica) during the past 2.6Ma

Two deep-sea cores (ANTA95-157 and ANTA98-1) were collected in the Pacific sector of the Southern Ocean across the present-day position of the Antarctic Polar Front Zone (APFZ) to document paleoenvironmental changes during the last 2.60Ma. The stratigraphic framework was established using a combinat...

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Published in:	Global and planetary change Vol. 77; no. 1-2; pp. 34 - 48
Main Authors:	Giuliani, Silvia, Capotondi, Lucilla, Maffioli, Paola, Langone, Leonardo, Giglio, Federico, Yam, Ruth, Frignani, Mauro, Ravaioli, Mariangela
Format:	Journal Article
Language:	English
Published:	01.05.2011
Subjects:	Antarctic region Antarctica Bacillariophyceae bulk density Carbon carbonates Dating Deep water Icebergs Isotopes mass spectrometry melting nitrogen organic matter oxygen Productivity silica Southern Ocean stable isotopes Antarctica Antarctic region PS, Antarctica PS, Antarctic Ocean PS, Antarctic Ocean, Antarctic Polar Front IS, Pacific
ISSN:	0921-8181
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Abstract	Two deep-sea cores (ANTA95-157 and ANTA98-1) were collected in the Pacific sector of the Southern Ocean across the present-day position of the Antarctic Polar Front Zone (APFZ) to document paleoenvironmental changes during the last 2.60Ma. The stratigraphic framework was established using a combination of diatom marker species, Accelerator Mass Spectrometry (AMS) 14C datings, magnetostratigraphy, and oxygen stable isotopes. The study was based on carbon and nitrogen isotopes of diatom-bound organic matter, dry bulk density, magnetic susceptibility, carbonates and biogenic silica contents. Large continental inputs were recorded during glacial periods and major iceberg melting occurred at 2.45Ma and during the Middle Pleistocene Revolution (MPR) time interval. Diatom production increased during the Early Pleistocene and remained significant ever since, with the exception of the MPR period and immediately before. Lower glacial diatom productivity linked to higher nitrogen utilization might have characterized the period between Marine Isotope Stages (MISs) 15-13 (0.6 and 0.5Ma), whereas succeeding glacial stages experienced an increase of diatom productivity promoted by the inflow of nutrient-rich deep waters. The low diatom production observed during interglacial stage 11 could be explained with a southward shift (up to 4A degree ) of the Polar Front (PF) with respect to its present position. Paleoproductivity levels have been confirmed as lower than those measured in other sectors of the Southern Ocean, with reduced differences among glacial and interglacial stages.
AbstractList	Two deep-sea cores (ANTA95-157 and ANTA98-1) were collected in the Pacific sector of the Southern Ocean across the present-day position of the Antarctic Polar Front Zone (APFZ) to document paleoenvironmental changes during the last 2.60Ma. The stratigraphic framework was established using a combination of diatom marker species, Accelerator Mass Spectrometry (AMS) 14C datings, magnetostratigraphy, and oxygen stable isotopes. The study was based on carbon and nitrogen isotopes of diatom-bound organic matter, dry bulk density, magnetic susceptibility, carbonates and biogenic silica contents. Large continental inputs were recorded during glacial periods and major iceberg melting occurred at 2.45Ma and during the Middle Pleistocene Revolution (MPR) time interval. Diatom production increased during the Early Pleistocene and remained significant ever since, with the exception of the MPR period and immediately before. Lower glacial diatom productivity linked to higher nitrogen utilization might have characterized the period between Marine Isotope Stages (MISs) 15-13 (0.6 and 0.5Ma), whereas succeeding glacial stages experienced an increase of diatom productivity promoted by the inflow of nutrient-rich deep waters. The low diatom production observed during interglacial stage 11 could be explained with a southward shift (up to 4A degree ) of the Polar Front (PF) with respect to its present position. Paleoproductivity levels have been confirmed as lower than those measured in other sectors of the Southern Ocean, with reduced differences among glacial and interglacial stages. Two deep-sea cores (ANTA95-157 and ANTA98-1) were collected in the Pacific sector of the Southern Ocean across the present-day position of the Antarctic Polar Front Zone (APFZ) to document paleoenvironmental changes during the last 2.60Ma. The stratigraphic framework was established using a combination of diatom marker species, Accelerator Mass Spectrometry (AMS) ¹⁴C datings, magnetostratigraphy, and oxygen stable isotopes. The study was based on carbon and nitrogen isotopes of diatom-bound organic matter, dry bulk density, magnetic susceptibility, carbonates and biogenic silica contents. Large continental inputs were recorded during glacial periods and major iceberg melting occurred at 2.45Ma and during the Middle Pleistocene Revolution (MPR) time interval. Diatom production increased during the Early Pleistocene and remained significant ever since, with the exception of the MPR period and immediately before. Lower glacial diatom productivity linked to higher nitrogen utilization might have characterized the period between Marine Isotope Stages (MISs) 15–13 (0.6 and 0.5Ma), whereas succeeding glacial stages experienced an increase of diatom productivity promoted by the inflow of nutrient-rich deep waters. The low diatom production observed during interglacial stage 11 could be explained with a southward shift (up to 4°) of the Polar Front (PF) with respect to its present position. Paleoproductivity levels have been confirmed as lower than those measured in other sectors of the Southern Ocean, with reduced differences among glacial and interglacial stages.
Author	Yam, Ruth Capotondi, Lucilla Langone, Leonardo Giuliani, Silvia Frignani, Mauro Maffioli, Paola Giglio, Federico Ravaioli, Mariangela
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Snippet	Two deep-sea cores (ANTA95-157 and ANTA98-1) were collected in the Pacific sector of the Southern Ocean across the present-day position of the Antarctic Polar...
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SubjectTerms	Antarctic region Antarctica Bacillariophyceae bulk density Carbon carbonates Dating Deep water Icebergs Isotopes mass spectrometry melting nitrogen organic matter oxygen Productivity silica Southern Ocean stable isotopes
Title	Paleoenvironmental changes in the Pacific sector of the Southern Ocean (Antarctica) during the past 2.6Ma
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