Diatom abundances in sediment sampled during James Clark Ross cruise JR15003 in 2015, West Antarctic Peninsula ...

The West Antarctic Peninsula (WAP) is a highly productive shelf region during austral summer, supporting a rich ecosystem that has a significant impact on carbon sequestration. This ecosystem is heterogeneous, and characterised by biological "hotspots" fuelled largely by diatom production....

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Bibliographic Details
Main Authors: Cassarino, Lucie, Hendry, Katharine R, Henley, Sian Frances, MacDonald, Ellen, Arndt, Sandra, de Freitas, Felipe Sales, Pike, Jennifer, Firing, Yvonne L
Format: Dataset
Language:English
Published: PANGAEA 2020
Subjects:
Benthic flux
continental shelf
early diagenesis
Silicon cyle
Event label
Campaign
Station label
Latitude of event
Longitude of event
DATE/TIME
DEPTH, sediment/rock
Abundance, marine diatoms
Chaetoceros spp. resting spores
Fragilariopsis cylindrus
Fragilariopsis curta
Fragilariopsis kerguelensis
Thalassiosira antarctica, resting spores
Thalassiosira antarctica
Thalassiosira gracilis var. expecta
Thalassiosira lentiginosa
Multiple investigations
JR15003
James Clark Ross
Antarctic
Antarctic Peninsula
Austral
Antarc*
Antarctica
Online Access:https://dx.doi.org/10.1594/pangaea.920053
https://doi.pangaea.de/10.1594/PANGAEA.920053
Description
Summary:The West Antarctic Peninsula (WAP) is a highly productive shelf region during austral summer, supporting a rich ecosystem that has a significant impact on carbon sequestration. This ecosystem is heterogeneous, and characterised by biological "hotspots" fuelled largely by diatom production. The specific mechanisms determining the location and extent of these hotspots are not fully understood. Sedimentary enrichment of silicic acid (DSi) relative to other nutrients along the WAP, suggest that nutrient transfer across the sediment-water interface could have an impact on algal community composition. Here we combine reaction-transport modelling with porewater profiles of DSi concentration and stable silicon isotopic composition, biogenic silica content (BSi) and diatom abundances from sediment cores collected along the WAP, to assess the DSi flux and the processes that release this key nutrient from the WAP sediment into the overlying waters. We estimate a DSi diffusive flux of 2.67- 10**10 ± 2.75- 10**9 mol/yr ...

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