Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes
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 resoluti...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier
2016
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Online Access: | https://oceanrep.geomar.de/id/eprint/27677/ https://oceanrep.geomar.de/id/eprint/27677/1/Riethdorf%20et.al.pdf https://oceanrep.geomar.de/id/eprint/27677/7/Riethdorf.pdf https://doi.org/10.1016/j.dsr2.2015.03.007 |
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ftoceanrep:oai:oceanrep.geomar.de:27677 2023-12-10T09:47:16+01:00 Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes Riethdorf, Jan-Rainer Thibodeau, Benoit Ikehara, D. Nürnberg, Dirk Max, L. Tiedemann, Ralf Yokoyama, Y. 2016-03-20 text https://oceanrep.geomar.de/id/eprint/27677/ https://oceanrep.geomar.de/id/eprint/27677/1/Riethdorf%20et.al.pdf https://oceanrep.geomar.de/id/eprint/27677/7/Riethdorf.pdf https://doi.org/10.1016/j.dsr2.2015.03.007 en eng Elsevier https://oceanrep.geomar.de/id/eprint/27677/1/Riethdorf%20et.al.pdf https://oceanrep.geomar.de/id/eprint/27677/7/Riethdorf.pdf Riethdorf, J. R., Thibodeau, B., Ikehara, D., Nürnberg, D. , Max, L., Tiedemann, R. and Yokoyama, Y. (2016) Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes. Open Access Deep Sea Research Part II: Topical Studies in Oceanography, 125 . pp. 163-176. DOI 10.1016/j.dsr2.2015.03.007 <https://doi.org/10.1016/j.dsr2.2015.03.007>. doi:10.1016/j.dsr2.2015.03.007 info:eu-repo/semantics/openAccess Article PeerReviewed 2016 ftoceanrep https://doi.org/10.1016/j.dsr2.2015.03.007 2023-11-13T00:22:56Z 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 180 kyr. 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 (mterr). 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 130 ka 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. Article in Journal/Newspaper Bering Sea Greenland OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Bering Sea Greenland Deep Sea Research Part II: Topical Studies in Oceanography 125-126 163 176 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
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 180 kyr. 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 (mterr). 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 130 ka 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. |
format |
Article in Journal/Newspaper |
author |
Riethdorf, Jan-Rainer Thibodeau, Benoit Ikehara, D. Nürnberg, Dirk Max, L. Tiedemann, Ralf Yokoyama, Y. |
spellingShingle |
Riethdorf, Jan-Rainer Thibodeau, Benoit Ikehara, D. Nürnberg, Dirk Max, L. Tiedemann, Ralf Yokoyama, Y. Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes |
author_facet |
Riethdorf, Jan-Rainer Thibodeau, Benoit Ikehara, D. Nürnberg, Dirk Max, L. Tiedemann, Ralf Yokoyama, Y. |
author_sort |
Riethdorf, Jan-Rainer |
title |
Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes |
title_short |
Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes |
title_full |
Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes |
title_fullStr |
Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes |
title_full_unstemmed |
Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes |
title_sort |
surface nitrate utilization in the bering sea since 180 ka bp : insight from sedimentary nitrogen isotopes |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://oceanrep.geomar.de/id/eprint/27677/ https://oceanrep.geomar.de/id/eprint/27677/1/Riethdorf%20et.al.pdf https://oceanrep.geomar.de/id/eprint/27677/7/Riethdorf.pdf https://doi.org/10.1016/j.dsr2.2015.03.007 |
geographic |
Bering Sea Greenland |
geographic_facet |
Bering Sea Greenland |
genre |
Bering Sea Greenland |
genre_facet |
Bering Sea Greenland |
op_relation |
https://oceanrep.geomar.de/id/eprint/27677/1/Riethdorf%20et.al.pdf https://oceanrep.geomar.de/id/eprint/27677/7/Riethdorf.pdf Riethdorf, J. R., Thibodeau, B., Ikehara, D., Nürnberg, D. , Max, L., Tiedemann, R. and Yokoyama, Y. (2016) Surface nitrate utilization in the Bering Sea since 180 ka BP : insight from sedimentary nitrogen isotopes. Open Access Deep Sea Research Part II: Topical Studies in Oceanography, 125 . pp. 163-176. DOI 10.1016/j.dsr2.2015.03.007 <https://doi.org/10.1016/j.dsr2.2015.03.007>. doi:10.1016/j.dsr2.2015.03.007 |
op_rights |
info:eu-repo/semantics/openAccess |
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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1784890861940637696 |