Diatom-bound nitrogen isotope and TEX86L-SST records of MD12-3394 and MD11-3353
Previous studies suggest that, during the late Pleistocene ice ages, surface-deep exchange was somehow weakened in the Southern Ocean's Antarctic Zone (AZ), reducing the leakage of deeply sequestered CO2 and thus contributing to the lower atmospheric CO2 levels of the ice ages. To better unders...
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Format: | Dataset |
Language: | English |
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PANGAEA
2021
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.931028 https://doi.org/10.1594/PANGAEA.931028 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.931028 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Diatom nitrogen isotope Southern Ocean TEX86 |
spellingShingle |
Diatom nitrogen isotope Southern Ocean TEX86 Ai, Xuyuan E Studer, Anja S Sigman, Daniel M Martínez-García, Alfredo François, Fripiat Thöle, Lena M Michel, Elisabeth Gottschalk, Julia Arnold, Laura Moretti, Simone Schmitt, Mareike Oleynik, Sergey Jaccard, Samuel L Haug, Gerald H Diatom-bound nitrogen isotope and TEX86L-SST records of MD12-3394 and MD11-3353 |
topic_facet |
Diatom nitrogen isotope Southern Ocean TEX86 |
description |
Previous studies suggest that, during the late Pleistocene ice ages, surface-deep exchange was somehow weakened in the Southern Ocean's Antarctic Zone (AZ), reducing the leakage of deeply sequestered CO2 and thus contributing to the lower atmospheric CO2 levels of the ice ages. To better understand the surface nutrient consumption in the Antarctic ocean during glacial intervals and its implication on atmospheric CO2 changes, we measured diatom-bound nitrogen isotopes (d15N_db) extending back to 150 thousand years ago (150ka) in two sediment cores in the Indian sector of the AZ. The data series include d15N_db, TEX86L-based SST, d18O of planktonic foraminifera Neogloboquadrina pachyderma (sin.), sediment Ba/Fe and the age model of MD12-3394 (48°23' S, 64°35' E, 2320m water depth), d15N_db and updated age model of MD11-3353 (50°34' S, 68°23' E, 1568m water depth), as well as the mean d15N_db of the two sediment cores, and the d15N_db offset calculated using the mean d15N_db and MD12-3394 d15N_db alone. The age model for MD12-3394 was based on 7 Holocene radiocarbon dates measured with planktonic foraminifera Neogloboquadrina pachyderma (sin.) and Globigerina bulloides hand-picked from the > 63µm fraction, and correlation of reconstructed SST by TEX86L to the Antarctic temperature stack (ATS) (adjusted to AICC2012 age scale) compiled from ice core data. Ages were linearly interpolated between the stratigraphic tie points. The age model of MD11-3353 is based on the age model published in Thöle et al. (2019), with modifications of the youngest age tie point and the tie point at Marine Isotope Stage (MIS) 5-6 transition, and two additional tie points during MIS 3 based on correlation of d15N_db to MD12-3394 d15N_db. Monte Carlo simulation and Kalman filter were combined to generate a mean d15N_db time series for the two sediment cores on a 500-year time grid, following the method in Wang et al. (2017). For the d15N_db offset, a linear fit was first applied to glacial (20-27 ka,140-155 ka) and interglacial (0-10 ka, ... |
format |
Dataset |
author |
Ai, Xuyuan E Studer, Anja S Sigman, Daniel M Martínez-García, Alfredo François, Fripiat Thöle, Lena M Michel, Elisabeth Gottschalk, Julia Arnold, Laura Moretti, Simone Schmitt, Mareike Oleynik, Sergey Jaccard, Samuel L Haug, Gerald H |
author_facet |
Ai, Xuyuan E Studer, Anja S Sigman, Daniel M Martínez-García, Alfredo François, Fripiat Thöle, Lena M Michel, Elisabeth Gottschalk, Julia Arnold, Laura Moretti, Simone Schmitt, Mareike Oleynik, Sergey Jaccard, Samuel L Haug, Gerald H |
author_sort |
Ai, Xuyuan E |
title |
Diatom-bound nitrogen isotope and TEX86L-SST records of MD12-3394 and MD11-3353 |
title_short |
Diatom-bound nitrogen isotope and TEX86L-SST records of MD12-3394 and MD11-3353 |
title_full |
Diatom-bound nitrogen isotope and TEX86L-SST records of MD12-3394 and MD11-3353 |
title_fullStr |
Diatom-bound nitrogen isotope and TEX86L-SST records of MD12-3394 and MD11-3353 |
title_full_unstemmed |
Diatom-bound nitrogen isotope and TEX86L-SST records of MD12-3394 and MD11-3353 |
title_sort |
diatom-bound nitrogen isotope and tex86l-sst records of md12-3394 and md11-3353 |
publisher |
PANGAEA |
publishDate |
2021 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.931028 https://doi.org/10.1594/PANGAEA.931028 |
op_coverage |
MEDIAN LATITUDE: -49.232333 * MEDIAN LONGITUDE: 66.061556 * SOUTH-BOUND LATITUDE: -50.567000 * WEST-BOUND LONGITUDE: 64.583000 * NORTH-BOUND LATITUDE: -48.383000 * EAST-BOUND LONGITUDE: 68.385000 * DATE/TIME START: 2011-01-30T00:00:00 * DATE/TIME END: 2011-01-30T00:00:00 |
long_lat |
ENVELOPE(64.583000,68.385000,-48.383000,-50.567000) |
geographic |
Antarctic Southern Ocean The Antarctic Indian Antarctic Ocean |
geographic_facet |
Antarctic Southern Ocean The Antarctic Indian Antarctic Ocean |
genre |
Antarc* Antarctic Antarctic Ocean ice core Neogloboquadrina pachyderma Planktonic foraminifera Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Ocean ice core Neogloboquadrina pachyderma Planktonic foraminifera Southern Ocean |
op_relation |
Ai, Xuyuan E; Studer, Anja S; Sigman, Daniel M; Martínez-García, Alfredo; Fripiat, François; Thöle, Lena M; Michel, Elisabeth; Gottschalk, Julia; Arnold, Laura; Moretti, Simone; Schmitt, Mareike; Oleynik, Sergey; Jaccard, Samuel L; Haug, Gerald H (2020): Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO2 change. Science, 370(6522), 1348-1352, https://doi.org/10.1126/science.abd2115 Thöle, Lena M; Amsler, Helen Eri; Moretti, Simone; Auderset, Alexandra; Gilgannon, James; Lippold, Jörg; Vogel, Hendrik; Crosta, Xavier; Mazaud, Alain; Michel, Elisabeth; Martínez-García, Alfredo; Jaccard, Samuel L (2019): Glacial-interglacial dust and export production records from the Southern Indian Ocean. Earth and Planetary Science Letters, 525, 115716, https://doi.org/10.1016/j.epsl.2019.115716 Wang, Xianfeng; Edwards, R Lawrence; Auler, Augusto S; Cheng, Hai; Kong, Xinggong; Wang, Yongjin; Cruz, Francisco William; Dorale, Jeffrey A; Chiang, Hong-Wei (2017): Hydroclimate changes across the Amazon lowlands over the past 45,000 years. Nature, 541(7636), 204-207, https://doi.org/10.1038/nature20787 https://doi.pangaea.de/10.1594/PANGAEA.931028 https://doi.org/10.1594/PANGAEA.931028 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.93102810.1126/science.abd211510.1016/j.epsl.2019.11571610.1038/nature20787 |
_version_ |
1802642722079637504 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.931028 2024-06-23T07:45:52+00:00 Diatom-bound nitrogen isotope and TEX86L-SST records of MD12-3394 and MD11-3353 Ai, Xuyuan E Studer, Anja S Sigman, Daniel M Martínez-García, Alfredo François, Fripiat Thöle, Lena M Michel, Elisabeth Gottschalk, Julia Arnold, Laura Moretti, Simone Schmitt, Mareike Oleynik, Sergey Jaccard, Samuel L Haug, Gerald H MEDIAN LATITUDE: -49.232333 * MEDIAN LONGITUDE: 66.061556 * SOUTH-BOUND LATITUDE: -50.567000 * WEST-BOUND LONGITUDE: 64.583000 * NORTH-BOUND LATITUDE: -48.383000 * EAST-BOUND LONGITUDE: 68.385000 * DATE/TIME START: 2011-01-30T00:00:00 * DATE/TIME END: 2011-01-30T00:00:00 2021 application/zip, 9 datasets https://doi.pangaea.de/10.1594/PANGAEA.931028 https://doi.org/10.1594/PANGAEA.931028 en eng PANGAEA Ai, Xuyuan E; Studer, Anja S; Sigman, Daniel M; Martínez-García, Alfredo; Fripiat, François; Thöle, Lena M; Michel, Elisabeth; Gottschalk, Julia; Arnold, Laura; Moretti, Simone; Schmitt, Mareike; Oleynik, Sergey; Jaccard, Samuel L; Haug, Gerald H (2020): Southern Ocean upwelling, Earth's obliquity, and glacial-interglacial atmospheric CO2 change. Science, 370(6522), 1348-1352, https://doi.org/10.1126/science.abd2115 Thöle, Lena M; Amsler, Helen Eri; Moretti, Simone; Auderset, Alexandra; Gilgannon, James; Lippold, Jörg; Vogel, Hendrik; Crosta, Xavier; Mazaud, Alain; Michel, Elisabeth; Martínez-García, Alfredo; Jaccard, Samuel L (2019): Glacial-interglacial dust and export production records from the Southern Indian Ocean. Earth and Planetary Science Letters, 525, 115716, https://doi.org/10.1016/j.epsl.2019.115716 Wang, Xianfeng; Edwards, R Lawrence; Auler, Augusto S; Cheng, Hai; Kong, Xinggong; Wang, Yongjin; Cruz, Francisco William; Dorale, Jeffrey A; Chiang, Hong-Wei (2017): Hydroclimate changes across the Amazon lowlands over the past 45,000 years. Nature, 541(7636), 204-207, https://doi.org/10.1038/nature20787 https://doi.pangaea.de/10.1594/PANGAEA.931028 https://doi.org/10.1594/PANGAEA.931028 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess Diatom nitrogen isotope Southern Ocean TEX86 Dataset 2021 ftpangaea https://doi.org/10.1594/PANGAEA.93102810.1126/science.abd211510.1016/j.epsl.2019.11571610.1038/nature20787 2024-06-12T14:17:12Z Previous studies suggest that, during the late Pleistocene ice ages, surface-deep exchange was somehow weakened in the Southern Ocean's Antarctic Zone (AZ), reducing the leakage of deeply sequestered CO2 and thus contributing to the lower atmospheric CO2 levels of the ice ages. To better understand the surface nutrient consumption in the Antarctic ocean during glacial intervals and its implication on atmospheric CO2 changes, we measured diatom-bound nitrogen isotopes (d15N_db) extending back to 150 thousand years ago (150ka) in two sediment cores in the Indian sector of the AZ. The data series include d15N_db, TEX86L-based SST, d18O of planktonic foraminifera Neogloboquadrina pachyderma (sin.), sediment Ba/Fe and the age model of MD12-3394 (48°23' S, 64°35' E, 2320m water depth), d15N_db and updated age model of MD11-3353 (50°34' S, 68°23' E, 1568m water depth), as well as the mean d15N_db of the two sediment cores, and the d15N_db offset calculated using the mean d15N_db and MD12-3394 d15N_db alone. The age model for MD12-3394 was based on 7 Holocene radiocarbon dates measured with planktonic foraminifera Neogloboquadrina pachyderma (sin.) and Globigerina bulloides hand-picked from the > 63µm fraction, and correlation of reconstructed SST by TEX86L to the Antarctic temperature stack (ATS) (adjusted to AICC2012 age scale) compiled from ice core data. Ages were linearly interpolated between the stratigraphic tie points. The age model of MD11-3353 is based on the age model published in Thöle et al. (2019), with modifications of the youngest age tie point and the tie point at Marine Isotope Stage (MIS) 5-6 transition, and two additional tie points during MIS 3 based on correlation of d15N_db to MD12-3394 d15N_db. Monte Carlo simulation and Kalman filter were combined to generate a mean d15N_db time series for the two sediment cores on a 500-year time grid, following the method in Wang et al. (2017). For the d15N_db offset, a linear fit was first applied to glacial (20-27 ka,140-155 ka) and interglacial (0-10 ka, ... Dataset Antarc* Antarctic Antarctic Ocean ice core Neogloboquadrina pachyderma Planktonic foraminifera Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean The Antarctic Indian Antarctic Ocean ENVELOPE(64.583000,68.385000,-48.383000,-50.567000) |