Stable isotope composition of diatom-bound organic matter, supplement to: Crosta, Xavier; Shemesh, Aldo (2002): Reconciling down core anticorrelation of diatom carbon and nitrogen isotopic ratios from the Southern Ocean. Paleoceanography, 17(1), 10-1-10-8
Oceanic nutrient cycling in the Southern Ocean is supposed to have an important impact on glacial-interglacial atmospheric CO2 changes and global climate. In order to characterize such nutrient cycling over the last two climatic cycles we investigated carbon and nitrogen isotopic ratios of diatom-bo...
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ftdatacite:10.1594/pangaea.846543 2023-05-15T13:59:27+02:00 Stable isotope composition of diatom-bound organic matter, supplement to: Crosta, Xavier; Shemesh, Aldo (2002): Reconciling down core anticorrelation of diatom carbon and nitrogen isotopic ratios from the Southern Ocean. Paleoceanography, 17(1), 10-1-10-8 Crosta, Xavier Shemesh, Aldo 2002 application/zip https://dx.doi.org/10.1594/pangaea.846543 https://doi.pangaea.de/10.1594/PANGAEA.846543 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://www.ncdc.noaa.gov/paleo/study/2559 https://dx.doi.org/10.1029/2000pa000565 https://www.ncdc.noaa.gov/paleo/study/2559 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY article Supplementary Collection of Datasets Collection 2002 ftdatacite https://doi.org/10.1594/pangaea.846543 https://doi.org/10.1029/2000pa000565 2022-02-09T13:29:49Z Oceanic nutrient cycling in the Southern Ocean is supposed to have an important impact on glacial-interglacial atmospheric CO2 changes and global climate. In order to characterize such nutrient cycling over the last two climatic cycles we investigated carbon and nitrogen isotopic ratios of diatom-bound organic matter (d13Cdiat and d15Ndiat, respectively) in two cores retrieved form the Atlantic and Indian sectors of the Antarctic Ocean. The two cores show the same isotopic patterns. The d13Cdiat values are depleted during glacial periods and enriched during interglacial periods, indicating lower productivity during cold times. The d15Ndiat values are enriched during glacial periods and depleted during interglacial periods, arguing for greater nitrate utilization during cold times. Taken at face value, this apparent contradiction leads to opposite conclusions on the role of the Southern Ocean biological pump on the atmospheric CO2 changes. However, the two sets of data can be reconciled by a "sea ice plus mixing rate scenario" that calls upon a balance between the effect of cutting off gas transfer at the ocean-atmosphere boundary and the effect of reducing vertical transport of nutrients through the pycnocline. Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Sea ice Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Indian Antarctic Ocean |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
description |
Oceanic nutrient cycling in the Southern Ocean is supposed to have an important impact on glacial-interglacial atmospheric CO2 changes and global climate. In order to characterize such nutrient cycling over the last two climatic cycles we investigated carbon and nitrogen isotopic ratios of diatom-bound organic matter (d13Cdiat and d15Ndiat, respectively) in two cores retrieved form the Atlantic and Indian sectors of the Antarctic Ocean. The two cores show the same isotopic patterns. The d13Cdiat values are depleted during glacial periods and enriched during interglacial periods, indicating lower productivity during cold times. The d15Ndiat values are enriched during glacial periods and depleted during interglacial periods, arguing for greater nitrate utilization during cold times. Taken at face value, this apparent contradiction leads to opposite conclusions on the role of the Southern Ocean biological pump on the atmospheric CO2 changes. However, the two sets of data can be reconciled by a "sea ice plus mixing rate scenario" that calls upon a balance between the effect of cutting off gas transfer at the ocean-atmosphere boundary and the effect of reducing vertical transport of nutrients through the pycnocline. |
format |
Article in Journal/Newspaper |
author |
Crosta, Xavier Shemesh, Aldo |
spellingShingle |
Crosta, Xavier Shemesh, Aldo Stable isotope composition of diatom-bound organic matter, supplement to: Crosta, Xavier; Shemesh, Aldo (2002): Reconciling down core anticorrelation of diatom carbon and nitrogen isotopic ratios from the Southern Ocean. Paleoceanography, 17(1), 10-1-10-8 |
author_facet |
Crosta, Xavier Shemesh, Aldo |
author_sort |
Crosta, Xavier |
title |
Stable isotope composition of diatom-bound organic matter, supplement to: Crosta, Xavier; Shemesh, Aldo (2002): Reconciling down core anticorrelation of diatom carbon and nitrogen isotopic ratios from the Southern Ocean. Paleoceanography, 17(1), 10-1-10-8 |
title_short |
Stable isotope composition of diatom-bound organic matter, supplement to: Crosta, Xavier; Shemesh, Aldo (2002): Reconciling down core anticorrelation of diatom carbon and nitrogen isotopic ratios from the Southern Ocean. Paleoceanography, 17(1), 10-1-10-8 |
title_full |
Stable isotope composition of diatom-bound organic matter, supplement to: Crosta, Xavier; Shemesh, Aldo (2002): Reconciling down core anticorrelation of diatom carbon and nitrogen isotopic ratios from the Southern Ocean. Paleoceanography, 17(1), 10-1-10-8 |
title_fullStr |
Stable isotope composition of diatom-bound organic matter, supplement to: Crosta, Xavier; Shemesh, Aldo (2002): Reconciling down core anticorrelation of diatom carbon and nitrogen isotopic ratios from the Southern Ocean. Paleoceanography, 17(1), 10-1-10-8 |
title_full_unstemmed |
Stable isotope composition of diatom-bound organic matter, supplement to: Crosta, Xavier; Shemesh, Aldo (2002): Reconciling down core anticorrelation of diatom carbon and nitrogen isotopic ratios from the Southern Ocean. Paleoceanography, 17(1), 10-1-10-8 |
title_sort |
stable isotope composition of diatom-bound organic matter, supplement to: crosta, xavier; shemesh, aldo (2002): reconciling down core anticorrelation of diatom carbon and nitrogen isotopic ratios from the southern ocean. paleoceanography, 17(1), 10-1-10-8 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2002 |
url |
https://dx.doi.org/10.1594/pangaea.846543 https://doi.pangaea.de/10.1594/PANGAEA.846543 |
geographic |
Antarctic Southern Ocean The Antarctic Indian Antarctic Ocean |
geographic_facet |
Antarctic Southern Ocean The Antarctic Indian Antarctic Ocean |
genre |
Antarc* Antarctic Antarctic Ocean Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Ocean Sea ice Southern Ocean |
op_relation |
https://www.ncdc.noaa.gov/paleo/study/2559 https://dx.doi.org/10.1029/2000pa000565 https://www.ncdc.noaa.gov/paleo/study/2559 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.846543 https://doi.org/10.1029/2000pa000565 |
_version_ |
1766268000761020416 |