Taxon-specific epibenthic foraminiferal d18O in the Arctic Ocean: Relationship to water masses, deep circulation, and brine release.

Show simple item record

dc.contributor.author Mackensen, Andreas
dc.contributor.author Nam, Seung-Il
dc.coverage.spatial MEDIAN LATITUDE: 77.916167 * MEDIAN LONGITUDE: 159.697199 * SOUTH-BOUND LATITUDE: 65.845000 * WEST-BOUND LONGITUDE: 1.108170 * NORTH-BOUND LATITUDE: 88.512000 * EAST-BOUND LONGITUDE: -4.066667 * DATE/TIME START: 1988-06-02T00:00:00 * DATE/TIME END: 2012-08-01T00:00:00
dc.date.accessioned 2019-11-26T01:59:44Z
dc.date.available 2019-11-26T01:59:44Z
dc.date.issued 2014-10-22
dc.identifier https://doi.pangaea.de/10.1594/PANGAEA.837010
dc.identifier https://doi.org/10.1594/PANGAEA.837010
dc.identifier.citation Mackensen, Andreas; Nam, Seung-Il (2014): Taxon-specific epibenthic foraminiferal d18O in the Arctic Ocean: Relationship to water masses, deep circulation, and brine release. Marine Micropaleontology, 113, 34-43, https://doi.org/10.1016/j.marmicro.2014.09.002
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/7911
dc.description.abstract We determined d18OCib values of live (Rose Bengal stained) and dead epibenthic foraminifera Cibicidoides wuellerstorfi, Cibicides lobatulus, and Cibicides refulgens in surface sediment samples from the Arctic Ocean and the Greenland, Iceland, and Norwegian seas (Nordic Sea). This is the first time that a comprehensive d18OCib data set is generated and compiled from the Arctic Ocean. For comparison, we defined Atlantic Water (AW), upper Arctic Bottom Water (uABW), and Arctic Bottom Water (ABW) by their temperature/salinity characteristics and calculated mean equilibrium calcite d18Oequ from summer sea-water d18Ow and in situ temperatures. As a result, in the Arctic environment we compensate for Cibicidoides- and Cibicides-specific offsets from equilibrium calcite of -0.35 and -0.55 per mil, respectively. After this taxon-specific adjustment, mean d18OCib values plausibly reflect the density stratification of principle water masses in the Nordic Sea and Arctic Ocean. In addition, mean d18OCib from AW not only significantly differs from mean d18OCib from ABW, but also d18OCib from within AW differentiates in function of provenience and water mass age. Furthermore, in shallow waters brine-derived low d18Ow can significantly lower the d18OCib of Cibicides spp. and thus d18OCib may serve as a paleobrine indicator. There is no statistically significant difference, however, between deeper water masses mean d18OCib of the Nordic Sea, and of the Eurasian and Amerasian basins, and no influence of low-d18Ow brines is recorded in Recent uABW and ABW d18OCib of C. wuellerstorfi. This may be due to dilution of a low-d18Ow brine signal in the deep sea, and/or to preferential incorporation of relatively high-d18Ow brines from high-salinity shelves. Although our data encompass environments with seasonal sea-ice and brine formation supposed to ultimately ventilate the deep Arctic Ocean, d18OCib from uABW and ABW do not indicate negative excursions. This may challenge hypotheses that call for enhanced Arctic brine release to explain negative benthic d18O spikes in deep-sea sediments from the late Pleistocene North Atlantic Ocean.
dc.format application/zip, 2 datasets
dc.language.iso en
dc.publisher PANGAEA
dc.rights CC-BY-3.0: Creative Commons Attribution 3.0 Unported
dc.rights Access constraints: unrestricted
dc.source Supplement to: Mackensen, Andreas; Nam, Seung-Il (2014): Taxon-specific epibenthic foraminiferal d18O in the Arctic Ocean: Relationship to water masses, deep circulation, and brine release. Marine Micropaleontology, 113, 34-43, https://doi.org/10.1016/j.marmicro.2014.09.002
dc.subject AWI_Paleo
dc.subject Paleoenvironmental Reconstructions from Marine Sediments @ AWI
dc.title Taxon-specific epibenthic foraminiferal d18O in the Arctic Ocean: Relationship to water masses, deep circulation, and brine release.
dc.title.alternative Stable oxygen isotope record of epibenthic foraminifera and water samples of the Arctic Ocean
dc.type Dataset


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

  • PANGAEA
    Метаданные публикаций с сайта https://www.pangaea.de/

Show simple item record