Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications

In this study, we used stable isotopes of oxygen (δ18O), deuterium (δD), and dissolved inorganic carbon (δ13CDIC) in combination with temperature, salinity, oxygen, and nutrient concentrations to characterize the coastal (71°–78°W) and an oceanic (82°–98°W) water masses (SAAW—Subantarctic Surface Wa...

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Published in:Journal of Geophysical Research: Oceans
Main Authors: Reyes‐Macaya, Dharma, Hoogakker, Babette, Martinez Mendez, Gema, Llanillo, Pedro J, Grasse, Patricia, Mohtadi, Mahyar, Mix, Alan, Leng, Melanie J, Struck, Ulrich, McCorkle, Daniel C, Troncoso, Macarena, Gayo, Eugenia M, Lange, Carina B, Farias, Laura, Carhuapoma, Wilson, Graco, Michelle, Cornejo‐D’Ottone, Marcela, De Pol Holz, Ricardo, Fernandez, Camila, Narvaez, Diego, Vargas, Cristian A, García‐Araya, Francisco, Hebbeln, Dierk
Format: Article in Journal/Newspaper
Language:unknown
Published: American Geophysical Union (AGU) 2022
Subjects:
Online Access:https://epic.awi.de/id/eprint/57688/
https://epic.awi.de/id/eprint/57688/1/Reyes-Macaya_etal_2021.pdf
https://hdl.handle.net/10013/epic.da303bed-320d-4852-afdf-0572f39841d1
id ftawi:oai:epic.awi.de:57688
record_format openpolar
spelling ftawi:oai:epic.awi.de:57688 2024-03-24T08:56:55+00:00 Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications Reyes‐Macaya, Dharma Hoogakker, Babette Martinez Mendez, Gema Llanillo, Pedro J Grasse, Patricia Mohtadi, Mahyar Mix, Alan Leng, Melanie J Struck, Ulrich McCorkle, Daniel C Troncoso, Macarena Gayo, Eugenia M Lange, Carina B Farias, Laura Carhuapoma, Wilson Graco, Michelle Cornejo‐D’Ottone, Marcela De Pol Holz, Ricardo Fernandez, Camila Narvaez, Diego Vargas, Cristian A García‐Araya, Francisco Hebbeln, Dierk 2022-01-20 application/pdf https://epic.awi.de/id/eprint/57688/ https://epic.awi.de/id/eprint/57688/1/Reyes-Macaya_etal_2021.pdf https://hdl.handle.net/10013/epic.da303bed-320d-4852-afdf-0572f39841d1 unknown American Geophysical Union (AGU) https://epic.awi.de/id/eprint/57688/1/Reyes-Macaya_etal_2021.pdf Reyes‐Macaya, D. , Hoogakker, B. , Martinez Mendez, G. , Llanillo, P. J. orcid:0000-0002-9308-501X , Grasse, P. , Mohtadi, M. , Mix, A. , Leng, M. J. , Struck, U. , McCorkle, D. C. , Troncoso, M. , Gayo, E. M. , Lange, C. B. , Farias, L. , Carhuapoma, W. , Graco, M. , Cornejo‐D’Ottone, M. , De Pol Holz, R. , Fernandez, C. , Narvaez, D. , Vargas, C. A. , García‐Araya, F. and Hebbeln, D. (2022) Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications , Journal of Geophysical Research - Oceans, 127 (1) . doi:10.1029/2021jc017525 <https://doi.org/10.1029/2021jc017525> , hdl:10013/epic.da303bed-320d-4852-afdf-0572f39841d1 EPIC3Journal of Geophysical Research - Oceans, American Geophysical Union (AGU), 127(1), ISSN: 2169-9275 Article peerRev 2022 ftawi https://doi.org/10.1029/2021jc017525 2024-02-27T09:55:26Z In this study, we used stable isotopes of oxygen (δ18O), deuterium (δD), and dissolved inorganic carbon (δ13CDIC) in combination with temperature, salinity, oxygen, and nutrient concentrations to characterize the coastal (71°–78°W) and an oceanic (82°–98°W) water masses (SAAW—Subantarctic Surface Water; STW—Subtropical Water; ESSW—Equatorial Subsurface water; AAIW—Antarctic Intermediate Water; PDW—Pacific Deep Water) of the Southeast Pacific (SEP). The results show that δ18O and δD can be used to differentiate between SAAW-STW, SAAW-ESSW, and ESSW-AAIW. δ13CDIC signatures can be used to differentiate between STW-ESSW (oceanic section), SAAW-ESSW, ESSW-AAIW, and AAIW-PDW. Compared with the oceanic section, our new coastal section highlights differences in both the chemistry and geometry of water masses above 1,000 m. Previous paleoceanographic studies using marine sediments from the SEP continental margin used the present-day hydrological oceanic transect to compare against, as the coastal section was not sufficiently characterized. We suggest that our new results of the coastal section should be used for past characterizations of the SEP water masses that are usually based on continental margin sediment samples. Article in Journal/Newspaper Antarc* Antarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Pacific Journal of Geophysical Research: Oceans 127 1
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id ftawi
language unknown
description In this study, we used stable isotopes of oxygen (δ18O), deuterium (δD), and dissolved inorganic carbon (δ13CDIC) in combination with temperature, salinity, oxygen, and nutrient concentrations to characterize the coastal (71°–78°W) and an oceanic (82°–98°W) water masses (SAAW—Subantarctic Surface Water; STW—Subtropical Water; ESSW—Equatorial Subsurface water; AAIW—Antarctic Intermediate Water; PDW—Pacific Deep Water) of the Southeast Pacific (SEP). The results show that δ18O and δD can be used to differentiate between SAAW-STW, SAAW-ESSW, and ESSW-AAIW. δ13CDIC signatures can be used to differentiate between STW-ESSW (oceanic section), SAAW-ESSW, ESSW-AAIW, and AAIW-PDW. Compared with the oceanic section, our new coastal section highlights differences in both the chemistry and geometry of water masses above 1,000 m. Previous paleoceanographic studies using marine sediments from the SEP continental margin used the present-day hydrological oceanic transect to compare against, as the coastal section was not sufficiently characterized. We suggest that our new results of the coastal section should be used for past characterizations of the SEP water masses that are usually based on continental margin sediment samples.
format Article in Journal/Newspaper
author Reyes‐Macaya, Dharma
Hoogakker, Babette
Martinez Mendez, Gema
Llanillo, Pedro J
Grasse, Patricia
Mohtadi, Mahyar
Mix, Alan
Leng, Melanie J
Struck, Ulrich
McCorkle, Daniel C
Troncoso, Macarena
Gayo, Eugenia M
Lange, Carina B
Farias, Laura
Carhuapoma, Wilson
Graco, Michelle
Cornejo‐D’Ottone, Marcela
De Pol Holz, Ricardo
Fernandez, Camila
Narvaez, Diego
Vargas, Cristian A
García‐Araya, Francisco
Hebbeln, Dierk
spellingShingle Reyes‐Macaya, Dharma
Hoogakker, Babette
Martinez Mendez, Gema
Llanillo, Pedro J
Grasse, Patricia
Mohtadi, Mahyar
Mix, Alan
Leng, Melanie J
Struck, Ulrich
McCorkle, Daniel C
Troncoso, Macarena
Gayo, Eugenia M
Lange, Carina B
Farias, Laura
Carhuapoma, Wilson
Graco, Michelle
Cornejo‐D’Ottone, Marcela
De Pol Holz, Ricardo
Fernandez, Camila
Narvaez, Diego
Vargas, Cristian A
García‐Araya, Francisco
Hebbeln, Dierk
Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications
author_facet Reyes‐Macaya, Dharma
Hoogakker, Babette
Martinez Mendez, Gema
Llanillo, Pedro J
Grasse, Patricia
Mohtadi, Mahyar
Mix, Alan
Leng, Melanie J
Struck, Ulrich
McCorkle, Daniel C
Troncoso, Macarena
Gayo, Eugenia M
Lange, Carina B
Farias, Laura
Carhuapoma, Wilson
Graco, Michelle
Cornejo‐D’Ottone, Marcela
De Pol Holz, Ricardo
Fernandez, Camila
Narvaez, Diego
Vargas, Cristian A
García‐Araya, Francisco
Hebbeln, Dierk
author_sort Reyes‐Macaya, Dharma
title Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications
title_short Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications
title_full Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications
title_fullStr Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications
title_full_unstemmed Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications
title_sort isotopic characterization of water masses in the southeast pacific region: paleoceanographic implications
publisher American Geophysical Union (AGU)
publishDate 2022
url https://epic.awi.de/id/eprint/57688/
https://epic.awi.de/id/eprint/57688/1/Reyes-Macaya_etal_2021.pdf
https://hdl.handle.net/10013/epic.da303bed-320d-4852-afdf-0572f39841d1
geographic Antarctic
Pacific
geographic_facet Antarctic
Pacific
genre Antarc*
Antarctic
genre_facet Antarc*
Antarctic
op_source EPIC3Journal of Geophysical Research - Oceans, American Geophysical Union (AGU), 127(1), ISSN: 2169-9275
op_relation https://epic.awi.de/id/eprint/57688/1/Reyes-Macaya_etal_2021.pdf
Reyes‐Macaya, D. , Hoogakker, B. , Martinez Mendez, G. , Llanillo, P. J. orcid:0000-0002-9308-501X , Grasse, P. , Mohtadi, M. , Mix, A. , Leng, M. J. , Struck, U. , McCorkle, D. C. , Troncoso, M. , Gayo, E. M. , Lange, C. B. , Farias, L. , Carhuapoma, W. , Graco, M. , Cornejo‐D’Ottone, M. , De Pol Holz, R. , Fernandez, C. , Narvaez, D. , Vargas, C. A. , García‐Araya, F. and Hebbeln, D. (2022) Isotopic Characterization of Water Masses in the Southeast Pacific Region: Paleoceanographic Implications , Journal of Geophysical Research - Oceans, 127 (1) . doi:10.1029/2021jc017525 <https://doi.org/10.1029/2021jc017525> , hdl:10013/epic.da303bed-320d-4852-afdf-0572f39841d1
op_doi https://doi.org/10.1029/2021jc017525
container_title Journal of Geophysical Research: Oceans
container_volume 127
container_issue 1
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