USAP-DC

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{"@context": "https://schema.org/", "@type": "Dataset", "@id": "doi:10.15784/601522", "additionalType": ["geolink:Dataset", "vivo:Dataset"], "name": "Surface Southern Ocean community growouts to evaluate the diatom bound N isotope proxy", "description": "Tracking variations in the surface ocean supply and demand of nitrate, a key marine nutrient, can help constrain the contribution of biological production in driving past climate shifts. The nitrogen isotopic composition (as \u03b415N) of organic matter in marine sediments is a proxy for surface ocean nitrate supply and demand over time but it may be subject to alteration during sinking and burial. The isotopic composition of nitrogen contained in the shells, or frustules, of diatoms (\u03b415NDB) is protected and is therefore a potentially more robust tracer of nitrate use in the past. Here we show that \u03b415NDB in Southern Ocean community cultures does not depend on species composition. We found the \u03b5DB (= biomass \u03b415N - \u03b415NDB) of the community growouts was -4.8 \u00b1 0.8\u2030, more than 10\u2030 different from previous monospecific growouts, but statistically indistinguishable from previous Southern Ocean and North Pacific surface ocean observations. The two community growouts, seeded with populations from 66\u00b0 and 61\u00b0S, had distinct community compositions but indistinguishable \u03b5DB, suggesting species composition does not primarily set \u03b415NDB values in the Southern Ocean. Our results demonstrate that under nitrate-replete conditions, \u03b415NDB values of frustules sinking from the surface ocean robustly track surface ocean nitrate \u03b415N values and therefore nitrate supply and demand. ", "citation": "Jones, C., Brzezinski, M., Closset, I., Kelly, R., Riesselman, C., Robinson, R., & Rebecca , R. (2022) \"Surface Southern Ocean community growouts to evaluate the diatom bound N isotope proxy\" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601522.", "datePublished": "2022-04-12", "keywords": ["Antarctica", "Nitrogen Isotopes", "Oceans", "Paleoproxies", "Southern Ocean"], "creator": [{"@type": "Person", "additionalType": "geolink:Person", "name": "Kelly, Roger", "email": null, "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Robinson, Rebecca ", "email": "", "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Closset, Ivia", "email": null, "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Brzezinski, Mark", "email": null, "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Robinson, Rebecca", "email": "rebecca_r@uri.edu", "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Jones, Colin", "email": "rebecca_r@uri.edu", "affiliation": {"@type": "Organization", "name": null}}, {"@type": "Person", "additionalType": "geolink:Person", "name": "Riesselman, Christina", "email": null, "affiliation": {"@type": "Organization", "name": null}}], "distribution": [{"@type": "DataDownload", "additionalType": "http://www.w3.org/ns/dcat#DataCatalog", "encodingFormat": "text/xml", "name": "ISO Metadata Document", "url": "https://www.usap-dc.org/metadata/isoxml/601522iso.xml", "contentUrl": "/dataset/filename"}, {"@type": "DataDownload", "@id": "http://dx.doi.org/10.15784/601522", "additionalType": "dcat:distribution", "url": "http://dx.doi.org/10.15784/601522", "name": "landing page", "description": "Link to a web page related to the resource.. 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Surface Southern Ocean community growouts to evaluate the diatom bound N isotope proxy Data DOI: https://doi.org/10.15784/601522 Cite as Jones, C., Brzezinski, M., Closset, I., Kelly, R., Riesselman, C., Robinson, R., & Rebecca , R. (2022) "Surface Southern Ocean community growouts to evaluate the diatom bound N isotope proxy" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601522. AMD - DIF Record(s) USAP-1341464_1 Abstract Tracking variations in the surface ocean supply and demand of nitrate, a key marine nutrient, can help constrain the contribution of biological production in driving past climate shifts. The nitrogen isotopic composition (as δ15N) of organic matter in marine sediments is a proxy for surface ocean nitrate supply and demand over time but it may be subject to alteration during sinking and burial. The isotopic composition of nitrogen contained in the shells, or frustules, of diatoms (δ15NDB) is protected and is therefore a potentially more robust tracer of nitrate use in the past. Here we show that δ15NDB in Southern Ocean community cultures does not depend on species composition. We found the εDB (= biomass δ15N - δ15NDB) of the community growouts was -4.8 ± 0.8‰, more than 10‰ different from previous monospecific growouts, but statistically indistinguishable from previous Southern Ocean and North Pacific surface ocean observations. The two community growouts, seeded with populations from 66° and 61°S, had distinct community compositions but indistinguishable εDB, suggesting species composition does not primarily set δ15NDB values in the Southern Ocean. Our results demonstrate that under nitrate-replete conditions, δ15NDB values of frustules sinking from the surface ocean robustly track surface ocean nitrate δ15N values and therefore nitrate supply and demand. Creator(s): Jones, Colin; Robinson, Rebecca; Brzezinski, Mark; Riesselman, Christina; Closset, Ivia; Kelly, Roger Date Created: 2022-02-14 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Spatial Extent(s) West: -170.4, East: -170, South: -66.2, North: -60.8 Award(s) NSF 1341464 Version: 1 Related Project(s) Collaborative Proposal: A Field and Laboratory Examination of the Diatom N and Si Isotope Proxies: Implications for Assessing the Southern Ocean Biological Pump Keywords Antarctica Nitrogen Isotopes Oceans Paleoproxies Southern Ocean