Surface nitrate utilization in the Bering sea since 180kA BP: Insight from sedimentary nitrogen isotopes
© 2015. We present high-resolution records of sedimentary nitrogen (δ15Nbulk) and carbon isotope ratios (δ13Cbulk) from piston core SO201-2-85KL located in the western Bering Sea. The records reflect changes in surface nitrate utilization and terrestrial organic matter contribution in submillennial...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Online Access: | https://doi.org/10.1016/j.dsr2.2015.03.007 http://hdl.handle.net/10722/210587 |
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ftunivhongkonghu:oai:hub.hku.hk:10722/210587 2023-05-15T15:43:15+02:00 Surface nitrate utilization in the Bering sea since 180kA BP: Insight from sedimentary nitrogen isotopes Tiedemann, Ralf Thibodeau, Benoit Riethdorf, Jan Rainer Ikehara, Minoru Yokoyama, Yusuke Nürnberg, Dirk Max, Lars 2015 https://doi.org/10.1016/j.dsr2.2015.03.007 http://hdl.handle.net/10722/210587 eng eng Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/dsr2 United Kingdom Deep-Sea Research Part II: Topical Studies in Oceanography Deep-Sea Research Part 2: Topical Studies in Oceanography, 2015, v. 125-126, p. 163–176 doi:10.1016/j.dsr2.2015.03.007 176 251577 0967-0645 eid_2-s2.0-84925605897 163 http://hdl.handle.net/10722/210587 125-126 © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Nitrogen isotopes Nitrate utilization Quaternary Bering Sea Article 2015 ftunivhongkonghu https://doi.org/10.1016/j.dsr2.2015.03.007 2023-01-14T16:06:51Z © 2015. We present high-resolution records of sedimentary nitrogen (δ15Nbulk) and carbon isotope ratios (δ13Cbulk) from piston core SO201-2-85KL located in the western Bering Sea. The records reflect changes in surface nitrate utilization and terrestrial organic matter contribution in submillennial resolution that span the last 180kyr. The δ15Nbulk record is characterized by a minimum during the penultimate interglacial indicating low nitrate utilization (~62-80%) despite the relatively high export production inferred from opal concentrations along with a significant reduction in the terrestrial organic matter fraction (m terr). This suggests that the consumption of the nitrate pool at our site was incomplete and even more reduced than today (~84%). δ15Nbulk increases from Marine Isotope Stage (MIS) 5.4 and culminates during the Last Glacial Maximum, which indicates that nitrate utilization in the Bering Sea was raised during cold intervals (MIS 5.4, 5.2, 4) and almost complete during MIS 3 and 2 (~93-100%). This is in agreement with previous hypotheses suggesting that stronger glacial stratification reduced the nutrient supply from the subeuphotic zone, thereby increasing the iron-to-nutrient ratio and therefore the nitrate utilization in the mixed surface layer. Large variations in δ15Nbulk were also recorded from 180 to 130ka BP (MIS 6), indicating a potential link to insolation and sea-level forcing and its related feedbacks. Millennial-scale oscillations were observed in δ15Nbulk and δ13Cbulk that might be related to Greenland interstadials. postprint Article in Journal/Newspaper Bering Sea Greenland University of Hong Kong: HKU Scholars Hub Bering Sea Greenland Deep Sea Research Part II: Topical Studies in Oceanography 125-126 163 176 |
institution |
Open Polar |
collection |
University of Hong Kong: HKU Scholars Hub |
op_collection_id |
ftunivhongkonghu |
language |
English |
topic |
Nitrogen isotopes Nitrate utilization Quaternary Bering Sea |
spellingShingle |
Nitrogen isotopes Nitrate utilization Quaternary Bering Sea Tiedemann, Ralf Thibodeau, Benoit Riethdorf, Jan Rainer Ikehara, Minoru Yokoyama, Yusuke Nürnberg, Dirk Max, Lars Surface nitrate utilization in the Bering sea since 180kA BP: Insight from sedimentary nitrogen isotopes |
topic_facet |
Nitrogen isotopes Nitrate utilization Quaternary Bering Sea |
description |
© 2015. We present high-resolution records of sedimentary nitrogen (δ15Nbulk) and carbon isotope ratios (δ13Cbulk) from piston core SO201-2-85KL located in the western Bering Sea. The records reflect changes in surface nitrate utilization and terrestrial organic matter contribution in submillennial resolution that span the last 180kyr. The δ15Nbulk record is characterized by a minimum during the penultimate interglacial indicating low nitrate utilization (~62-80%) despite the relatively high export production inferred from opal concentrations along with a significant reduction in the terrestrial organic matter fraction (m terr). This suggests that the consumption of the nitrate pool at our site was incomplete and even more reduced than today (~84%). δ15Nbulk increases from Marine Isotope Stage (MIS) 5.4 and culminates during the Last Glacial Maximum, which indicates that nitrate utilization in the Bering Sea was raised during cold intervals (MIS 5.4, 5.2, 4) and almost complete during MIS 3 and 2 (~93-100%). This is in agreement with previous hypotheses suggesting that stronger glacial stratification reduced the nutrient supply from the subeuphotic zone, thereby increasing the iron-to-nutrient ratio and therefore the nitrate utilization in the mixed surface layer. Large variations in δ15Nbulk were also recorded from 180 to 130ka BP (MIS 6), indicating a potential link to insolation and sea-level forcing and its related feedbacks. Millennial-scale oscillations were observed in δ15Nbulk and δ13Cbulk that might be related to Greenland interstadials. postprint |
format |
Article in Journal/Newspaper |
author |
Tiedemann, Ralf Thibodeau, Benoit Riethdorf, Jan Rainer Ikehara, Minoru Yokoyama, Yusuke Nürnberg, Dirk Max, Lars |
author_facet |
Tiedemann, Ralf Thibodeau, Benoit Riethdorf, Jan Rainer Ikehara, Minoru Yokoyama, Yusuke Nürnberg, Dirk Max, Lars |
author_sort |
Tiedemann, Ralf |
title |
Surface nitrate utilization in the Bering sea since 180kA BP: Insight from sedimentary nitrogen isotopes |
title_short |
Surface nitrate utilization in the Bering sea since 180kA BP: Insight from sedimentary nitrogen isotopes |
title_full |
Surface nitrate utilization in the Bering sea since 180kA BP: Insight from sedimentary nitrogen isotopes |
title_fullStr |
Surface nitrate utilization in the Bering sea since 180kA BP: Insight from sedimentary nitrogen isotopes |
title_full_unstemmed |
Surface nitrate utilization in the Bering sea since 180kA BP: Insight from sedimentary nitrogen isotopes |
title_sort |
surface nitrate utilization in the bering sea since 180ka bp: insight from sedimentary nitrogen isotopes |
publisher |
Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/dsr2 |
publishDate |
2015 |
url |
https://doi.org/10.1016/j.dsr2.2015.03.007 http://hdl.handle.net/10722/210587 |
geographic |
Bering Sea Greenland |
geographic_facet |
Bering Sea Greenland |
genre |
Bering Sea Greenland |
genre_facet |
Bering Sea Greenland |
op_relation |
Deep-Sea Research Part II: Topical Studies in Oceanography Deep-Sea Research Part 2: Topical Studies in Oceanography, 2015, v. 125-126, p. 163–176 doi:10.1016/j.dsr2.2015.03.007 176 251577 0967-0645 eid_2-s2.0-84925605897 163 http://hdl.handle.net/10722/210587 125-126 |
op_rights |
© 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.dsr2.2015.03.007 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
125-126 |
container_start_page |
163 |
op_container_end_page |
176 |
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