Ostracod response to monsoon and OMZ variability over the past 1.2 Myr
We present the first continuous middle through late Pleistocene record of fossil ostracods from the Maldives in the northern Indian Ocean, derived from sediment cores taken at Site U1467 by Expedition 359 of the International Ocean Discovery Program (IODP). Site U1467 lies at 487 m water depth in th...
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2022
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Online Access: | https://eprints.soton.ac.uk/456163/ https://eprints.soton.ac.uk/456163/1/Ostracod_response_to_monsoon_and_OMZ_variability_over_the_past_1.2_Myr.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:456163 2024-05-19T07:29:57+00:00 Ostracod response to monsoon and OMZ variability over the past 1.2 Myr Alvarez Zarikian, Carlos A. Nadiri, Chimnaz Alonso-garcía, Montserrat Rodrigues, Teresa Huang, Huai-hsuan M. Lindhorst, Sebastian Kunkelova, Tereza Kroon, Dick Betzler, Christian Yasuhara, Moriaki 2022-06 text https://eprints.soton.ac.uk/456163/ https://eprints.soton.ac.uk/456163/1/Ostracod_response_to_monsoon_and_OMZ_variability_over_the_past_1.2_Myr.pdf en English eng https://eprints.soton.ac.uk/456163/1/Ostracod_response_to_monsoon_and_OMZ_variability_over_the_past_1.2_Myr.pdf Alvarez Zarikian, Carlos A., Nadiri, Chimnaz, Alonso-garcía, Montserrat, Rodrigues, Teresa, Huang, Huai-hsuan M., Lindhorst, Sebastian, Kunkelova, Tereza, Kroon, Dick, Betzler, Christian and Yasuhara, Moriaki (2022) Ostracod response to monsoon and OMZ variability over the past 1.2 Myr. Marine Micropaleontology, 174, 1-19, [102105]. (doi:10.1016/j.marmicro.2022.102105 <http://dx.doi.org/10.1016/j.marmicro.2022.102105>). cc_by_nc_nd_4 Article PeerReviewed 2022 ftsouthampton https://doi.org/10.1016/j.marmicro.2022.102105 2024-04-23T23:33:49Z We present the first continuous middle through late Pleistocene record of fossil ostracods from the Maldives in the northern Indian Ocean, derived from sediment cores taken at Site U1467 by Expedition 359 of the International Ocean Discovery Program (IODP). Site U1467 lies at 487 m water depth in the Inner Sea of the Maldives archipelago, an ideal place for studying the effects of the South Asian Monsoon (SAM) system on primary productivity, intermediate depth ocean circulation, and the regional oxygen minimum zone (OMZ). The Inner Sea acts as a natural sediment trap that has undergone continuous sedimentation for millions of years with minor terrestrial influence. Our record spans from Marine Isotope Stage (MIS) 35 to the present, covering the mid-Pleistocene transition (1.2–0.6 Ma) and the Mid-Brunhes Event (MBE, at ~480 ka) the time when ice age cycles transitioned from occurring every 40,000 years to 100,000 years. The ostracod data is interpreted alongside the existing datasets from the same site of sedimentological (grain-size) and XRF-elemental analyses, and new organic biomarker data also from Site U1467. These datasets support the paleoenvironmental interpretation of the ostracod assemblages. Ostracods are abundant and diverse, displaying a prominent change in faunal composition at the MBE related to the increase in the amplitude of glacial-interglacial cycles, which deeply affected the monsoon system and thereby the past oceanographic conditions of the Maldives Inner Sea. Furthermore, ostracods exhibit distinctly different assemblages across glacial-interglacial cycles, particularly after the MBE, and these changes convincingly correspond to variability of the OMZ. Glacial periods are characterized by ostracod indicators of well‑oxygenated bottom water due to the intensification of the winter monsoon and the contraction of the OMZ. Abundant psychrospheric ostracods during glacials suggests that a southern sourced water mass, such as Antarctic Intermediate Water (AAIW) and/or Subantarctic Mode water, ... Article in Journal/Newspaper Antarc* Antarctic University of Southampton: e-Prints Soton Marine Micropaleontology 174 102105 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
We present the first continuous middle through late Pleistocene record of fossil ostracods from the Maldives in the northern Indian Ocean, derived from sediment cores taken at Site U1467 by Expedition 359 of the International Ocean Discovery Program (IODP). Site U1467 lies at 487 m water depth in the Inner Sea of the Maldives archipelago, an ideal place for studying the effects of the South Asian Monsoon (SAM) system on primary productivity, intermediate depth ocean circulation, and the regional oxygen minimum zone (OMZ). The Inner Sea acts as a natural sediment trap that has undergone continuous sedimentation for millions of years with minor terrestrial influence. Our record spans from Marine Isotope Stage (MIS) 35 to the present, covering the mid-Pleistocene transition (1.2–0.6 Ma) and the Mid-Brunhes Event (MBE, at ~480 ka) the time when ice age cycles transitioned from occurring every 40,000 years to 100,000 years. The ostracod data is interpreted alongside the existing datasets from the same site of sedimentological (grain-size) and XRF-elemental analyses, and new organic biomarker data also from Site U1467. These datasets support the paleoenvironmental interpretation of the ostracod assemblages. Ostracods are abundant and diverse, displaying a prominent change in faunal composition at the MBE related to the increase in the amplitude of glacial-interglacial cycles, which deeply affected the monsoon system and thereby the past oceanographic conditions of the Maldives Inner Sea. Furthermore, ostracods exhibit distinctly different assemblages across glacial-interglacial cycles, particularly after the MBE, and these changes convincingly correspond to variability of the OMZ. Glacial periods are characterized by ostracod indicators of well‑oxygenated bottom water due to the intensification of the winter monsoon and the contraction of the OMZ. Abundant psychrospheric ostracods during glacials suggests that a southern sourced water mass, such as Antarctic Intermediate Water (AAIW) and/or Subantarctic Mode water, ... |
format |
Article in Journal/Newspaper |
author |
Alvarez Zarikian, Carlos A. Nadiri, Chimnaz Alonso-garcía, Montserrat Rodrigues, Teresa Huang, Huai-hsuan M. Lindhorst, Sebastian Kunkelova, Tereza Kroon, Dick Betzler, Christian Yasuhara, Moriaki |
spellingShingle |
Alvarez Zarikian, Carlos A. Nadiri, Chimnaz Alonso-garcía, Montserrat Rodrigues, Teresa Huang, Huai-hsuan M. Lindhorst, Sebastian Kunkelova, Tereza Kroon, Dick Betzler, Christian Yasuhara, Moriaki Ostracod response to monsoon and OMZ variability over the past 1.2 Myr |
author_facet |
Alvarez Zarikian, Carlos A. Nadiri, Chimnaz Alonso-garcía, Montserrat Rodrigues, Teresa Huang, Huai-hsuan M. Lindhorst, Sebastian Kunkelova, Tereza Kroon, Dick Betzler, Christian Yasuhara, Moriaki |
author_sort |
Alvarez Zarikian, Carlos A. |
title |
Ostracod response to monsoon and OMZ variability over the past 1.2 Myr |
title_short |
Ostracod response to monsoon and OMZ variability over the past 1.2 Myr |
title_full |
Ostracod response to monsoon and OMZ variability over the past 1.2 Myr |
title_fullStr |
Ostracod response to monsoon and OMZ variability over the past 1.2 Myr |
title_full_unstemmed |
Ostracod response to monsoon and OMZ variability over the past 1.2 Myr |
title_sort |
ostracod response to monsoon and omz variability over the past 1.2 myr |
publishDate |
2022 |
url |
https://eprints.soton.ac.uk/456163/ https://eprints.soton.ac.uk/456163/1/Ostracod_response_to_monsoon_and_OMZ_variability_over_the_past_1.2_Myr.pdf |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://eprints.soton.ac.uk/456163/1/Ostracod_response_to_monsoon_and_OMZ_variability_over_the_past_1.2_Myr.pdf Alvarez Zarikian, Carlos A., Nadiri, Chimnaz, Alonso-garcía, Montserrat, Rodrigues, Teresa, Huang, Huai-hsuan M., Lindhorst, Sebastian, Kunkelova, Tereza, Kroon, Dick, Betzler, Christian and Yasuhara, Moriaki (2022) Ostracod response to monsoon and OMZ variability over the past 1.2 Myr. Marine Micropaleontology, 174, 1-19, [102105]. (doi:10.1016/j.marmicro.2022.102105 <http://dx.doi.org/10.1016/j.marmicro.2022.102105>). |
op_rights |
cc_by_nc_nd_4 |
op_doi |
https://doi.org/10.1016/j.marmicro.2022.102105 |
container_title |
Marine Micropaleontology |
container_volume |
174 |
container_start_page |
102105 |
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1799482565056266240 |