Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles
N2 fixation in low-latitude surface waters dominates the input of fixed nitrogen (N) to the global ocean, sustaining ocean fertility. In the Caribbean Sea, higher foraminifera-bound (FB-)delta 15N indicates a decline in N2 fixation during ice ages, but its cause and broader implications are unclear....
Published in: | Frontiers in Marine Science |
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Main Authors: | , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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AGU (American Geophysical Union)
2024
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Online Access: | https://oceanrep.geomar.de/id/eprint/60677/ https://oceanrep.geomar.de/id/eprint/60677/1/Paleoceanog%20and%20Paleoclimatol%20-%202024%20-%20Auderset%20-%20Sea%20Level%20Modulation%20of%20Atlantic%20Nitrogen%20Fixation%20Over%20Glacial%20Cycles.pdf https://oceanrep.geomar.de/id/eprint/60677/2/2024pa004878-sup-0001-supporting%20information%20si-s01.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2024PA004878 https://doi.org/10.1029/2024PA004878 |
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ftoceanrep:oai:oceanrep.geomar.de:60677 2024-09-15T18:23:04+00:00 Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles Auderset, Alexandra Fripiat, François Creel, Roger C. Oesch, Lukas Studer, Anja S. Repschläger, Janne Hathorne, Ed C. Vonhof, Hubert Schiebel, Ralf Gordon, Laura Lawrence, Kira Ren, Haojia Abby Haug, Gerald H. Sigman, Daniel M. Martínez‐García, Alfredo 2024-08-09 text https://oceanrep.geomar.de/id/eprint/60677/ https://oceanrep.geomar.de/id/eprint/60677/1/Paleoceanog%20and%20Paleoclimatol%20-%202024%20-%20Auderset%20-%20Sea%20Level%20Modulation%20of%20Atlantic%20Nitrogen%20Fixation%20Over%20Glacial%20Cycles.pdf https://oceanrep.geomar.de/id/eprint/60677/2/2024pa004878-sup-0001-supporting%20information%20si-s01.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2024PA004878 https://doi.org/10.1029/2024PA004878 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/60677/1/Paleoceanog%20and%20Paleoclimatol%20-%202024%20-%20Auderset%20-%20Sea%20Level%20Modulation%20of%20Atlantic%20Nitrogen%20Fixation%20Over%20Glacial%20Cycles.pdf https://oceanrep.geomar.de/id/eprint/60677/2/2024pa004878-sup-0001-supporting%20information%20si-s01.pdf Auderset, A., Fripiat, F., Creel, R. C., Oesch, L., Studer, A. S., Repschläger, J., Hathorne, E. C. , Vonhof, H., Schiebel, R., Gordon, L., Lawrence, K., Ren, H. A., Haug, G. H., Sigman, D. M. and Martínez‐García, A. (2024) Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles. Open Access Paleoceanography and Paleoclimatology, 39 (8). Art.Nr. e2024PA004878. DOI 10.1029/2024PA004878 <https://doi.org/10.1029/2024PA004878>. doi:10.1029/2024PA004878 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2024 ftoceanrep https://doi.org/10.1029/2024PA004878 2024-08-19T23:40:11Z N2 fixation in low-latitude surface waters dominates the input of fixed nitrogen (N) to the global ocean, sustaining ocean fertility. In the Caribbean Sea, higher foraminifera-bound (FB-)delta 15N indicates a decline in N2 fixation during ice ages, but its cause and broader implications are unclear. Here, we report three additional Atlantic FB-delta 15N records, from the subtropical North and South Atlantic gyres (MSM58-50 and DSDP Site 516) and the equatorial Atlantic (ODP Site 662). Similar glacial and interglacial delta 15N in the equatorial Atlantic suggests a stable delta 15N for the nitrate below the gyre thermoclines. The North Atlantic record shows a FB-delta 15N rise during the ice ages, resembling a previously published FB-delta 15N record from the South China Sea. The commonality among the FB-delta 15N records is that they resemble sea level-driven variation in regional shelf area, with high FB-delta 15N (inferred reduction in N2 fixation) during periods of low shelf area. The South China Sea shows the largest delta 15N signal, the subtropical North Atlantic shows less, and the South Atlantic shows the least, the same ordering as the ice age reductions in continental shelf area in the different regions. Reduced shelf sedimentary denitrification would have increased the nitrogen-to-phosphorus ratio of the nutrient supply to open ocean surface waters, leading to decreased N2 fixation and thus higher gyre thermocline nitrate delta 15N, explaining the higher FB-delta 15N of peak ice ages. These observations identify shelf sediment denitrification as an important regional driver of modern N2 fixation and imply strong basin-scale coupling of fixed nitrogen losses and inputs. Nitrogen fixation plays the crucial role in the ocean of supplying bioavailable nitrogen (N), a major nutrient for phytoplankton growth. Variations in nitrogen fixation over time can, therefore, significantly impact ocean productivity and, consequently, carbon sequestration in the ocean interior. To infer past changes in nitrogen ... Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Frontiers in Marine Science 11 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
N2 fixation in low-latitude surface waters dominates the input of fixed nitrogen (N) to the global ocean, sustaining ocean fertility. In the Caribbean Sea, higher foraminifera-bound (FB-)delta 15N indicates a decline in N2 fixation during ice ages, but its cause and broader implications are unclear. Here, we report three additional Atlantic FB-delta 15N records, from the subtropical North and South Atlantic gyres (MSM58-50 and DSDP Site 516) and the equatorial Atlantic (ODP Site 662). Similar glacial and interglacial delta 15N in the equatorial Atlantic suggests a stable delta 15N for the nitrate below the gyre thermoclines. The North Atlantic record shows a FB-delta 15N rise during the ice ages, resembling a previously published FB-delta 15N record from the South China Sea. The commonality among the FB-delta 15N records is that they resemble sea level-driven variation in regional shelf area, with high FB-delta 15N (inferred reduction in N2 fixation) during periods of low shelf area. The South China Sea shows the largest delta 15N signal, the subtropical North Atlantic shows less, and the South Atlantic shows the least, the same ordering as the ice age reductions in continental shelf area in the different regions. Reduced shelf sedimentary denitrification would have increased the nitrogen-to-phosphorus ratio of the nutrient supply to open ocean surface waters, leading to decreased N2 fixation and thus higher gyre thermocline nitrate delta 15N, explaining the higher FB-delta 15N of peak ice ages. These observations identify shelf sediment denitrification as an important regional driver of modern N2 fixation and imply strong basin-scale coupling of fixed nitrogen losses and inputs. Nitrogen fixation plays the crucial role in the ocean of supplying bioavailable nitrogen (N), a major nutrient for phytoplankton growth. Variations in nitrogen fixation over time can, therefore, significantly impact ocean productivity and, consequently, carbon sequestration in the ocean interior. To infer past changes in nitrogen ... |
format |
Article in Journal/Newspaper |
author |
Auderset, Alexandra Fripiat, François Creel, Roger C. Oesch, Lukas Studer, Anja S. Repschläger, Janne Hathorne, Ed C. Vonhof, Hubert Schiebel, Ralf Gordon, Laura Lawrence, Kira Ren, Haojia Abby Haug, Gerald H. Sigman, Daniel M. Martínez‐García, Alfredo |
spellingShingle |
Auderset, Alexandra Fripiat, François Creel, Roger C. Oesch, Lukas Studer, Anja S. Repschläger, Janne Hathorne, Ed C. Vonhof, Hubert Schiebel, Ralf Gordon, Laura Lawrence, Kira Ren, Haojia Abby Haug, Gerald H. Sigman, Daniel M. Martínez‐García, Alfredo Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles |
author_facet |
Auderset, Alexandra Fripiat, François Creel, Roger C. Oesch, Lukas Studer, Anja S. Repschläger, Janne Hathorne, Ed C. Vonhof, Hubert Schiebel, Ralf Gordon, Laura Lawrence, Kira Ren, Haojia Abby Haug, Gerald H. Sigman, Daniel M. Martínez‐García, Alfredo |
author_sort |
Auderset, Alexandra |
title |
Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles |
title_short |
Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles |
title_full |
Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles |
title_fullStr |
Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles |
title_full_unstemmed |
Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles |
title_sort |
sea level modulation of atlantic nitrogen fixation over glacial cycles |
publisher |
AGU (American Geophysical Union) |
publishDate |
2024 |
url |
https://oceanrep.geomar.de/id/eprint/60677/ https://oceanrep.geomar.de/id/eprint/60677/1/Paleoceanog%20and%20Paleoclimatol%20-%202024%20-%20Auderset%20-%20Sea%20Level%20Modulation%20of%20Atlantic%20Nitrogen%20Fixation%20Over%20Glacial%20Cycles.pdf https://oceanrep.geomar.de/id/eprint/60677/2/2024pa004878-sup-0001-supporting%20information%20si-s01.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2024PA004878 https://doi.org/10.1029/2024PA004878 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/60677/1/Paleoceanog%20and%20Paleoclimatol%20-%202024%20-%20Auderset%20-%20Sea%20Level%20Modulation%20of%20Atlantic%20Nitrogen%20Fixation%20Over%20Glacial%20Cycles.pdf https://oceanrep.geomar.de/id/eprint/60677/2/2024pa004878-sup-0001-supporting%20information%20si-s01.pdf Auderset, A., Fripiat, F., Creel, R. C., Oesch, L., Studer, A. S., Repschläger, J., Hathorne, E. C. , Vonhof, H., Schiebel, R., Gordon, L., Lawrence, K., Ren, H. A., Haug, G. H., Sigman, D. M. and Martínez‐García, A. (2024) Sea Level Modulation of Atlantic Nitrogen Fixation Over Glacial Cycles. Open Access Paleoceanography and Paleoclimatology, 39 (8). Art.Nr. e2024PA004878. DOI 10.1029/2024PA004878 <https://doi.org/10.1029/2024PA004878>. doi:10.1029/2024PA004878 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2024PA004878 |
container_title |
Frontiers in Marine Science |
container_volume |
11 |
_version_ |
1810463185211228160 |