CN of diatom-bound organic matter in surface sediments ...

Treatment of diatom microfossils from Southern Ocean sediments with hot perchloric acid leaves a "diatom-bound" N fraction which is 0-4 per mil lower in d15N than the bulk sediment, typically 3 per mil lower in recent Antarctic diatom ooze. Results from Southern Ocean surface sediments ind...

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Bibliographic Details
Main Authors: Sigman, Daniel M, Altabet, Mark A, Francois, Roger, McCorkle, Daniel C, Gaillard, Jean-Francois
Format: Dataset
Language:English
Published: PANGAEA 1999
Subjects:
Event label
Latitude of event
Longitude of event
DEPTH, sediment/rock
Depth, top/min
Depth, bottom/max
Carbon/Nitrogen ratio
MultiCorer
MD75
NBP9604
Marion Dufresne 1972
Nathaniel B. Palmer
Antarctic
Indian
Southern Ocean
Antarc*
Online Access:https://dx.doi.org/10.1594/pangaea.856899
https://doi.pangaea.de/10.1594/PANGAEA.856899
Description
Summary:Treatment of diatom microfossils from Southern Ocean sediments with hot perchloric acid leaves a "diatom-bound" N fraction which is 0-4 per mil lower in d15N than the bulk sediment, typically 3 per mil lower in recent Antarctic diatom ooze. Results from Southern Ocean surface sediments indicate that early diagenetic changes in bulk sediment N content and d15N are not reflected in diatom-bound N, suggesting that diatom-bound N is physically protected from early diagenesis by the microfossil matrix. A meridional transect of multicores from the Indian sector of the Southern Ocean shows a northward increase in the d15N of diatom-bound N, suggesting that diatom-bound d15N, like bulk sedimentary d15N, varies with nitrate utilization in the overlying surface waters. The d15N of diatom-bound N is 3-4 per mil higher in glacial age Antarctic sediments than in Holocene sediments, supporting the hypothesis, previously based on bulk sediment d15N, that nitrate utilization in the surface Antarctic was higher during the ... : Supplement to: Sigman, Daniel M; Altabet, Mark A; Francois, Roger; McCorkle, Daniel C; Gaillard, Jean-Francois (1999): The isotopic composition of diatom-bound nitrogen in Southern Ocean sediments. Paleoceanography, 14(2), 118-134 ...

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