From Australian Oceans Data Network
JSON RDF ISO19115-3 XML

Coccolithophore species fluxes in the Australian sector of the southern Antarctic Zone

Created 13/03/2025

Updated 13/03/2025

JSON RDF ISO19115-3 XML

Coccolithophore fluxes were investigated over a one-year period (2001-02) at the southern Antarctic Zone in the Australian Sector of the Southern Ocean at the site of the Southern Ocean Iron Release Experiment (SOIREE) near 61°S, 140°E. Two vertically moored sediment traps were deployed at 2000 and 3700 m below sea-level during a period of 10 months. In these data sets we present the results on the temporal and vertical variability of total coccolith flux, species composition and seasonal changes in coccolith weights of E. huxleyi populations estimated using circularly polarised micrographs analysed with C-Calcita software. A description of the field experiment, diatom and biogeochemical fluxes can be found in Rigual-Hernández et al. (2015), while a detailed description of sample processing and counting of coccolithophores can be found in Rigual-Hernández et al. (2018). Moreover, an explanation of the estimation of Emiliania huxleyi coccoliths using C-Calcita software can be also found in Rigual-Hernandez et al. (2018). Coccolithophore assemblages captured by the traps were nearly monospecific for Emiliania huxleyi morphotype B/C. Coccolith fluxes showed strong seasonal cycle at both sediment trap depths. The maximum coccolith export occurred during summer and was divided into two peaks in early January (2.2 x 109 coccoliths m-2 d-1 at 2000 m) and in mid-February (9.8 x 108 coccoliths m-2 d-1). Coccolith flux was very low in winter (down to ~7 x 107 coccoliths m-2 d-1). Coccolith fluxes in the deeper trap (3700 m) followed a similar pattern to that in the 2000 m trap with a delay of about one sampling interval. Coccoliths intercepted by the traps exhibited a weight and length reduction during summer. The annual coccolith weight at both sediment traps was 2.11 plus or minus 0.96 and 2.13 plus or minus 0.91 pg at 2000 m and 3700 m, respectively. Our coccolith mass estimation was consistent with previous reports for morphotype B/C in other regions of the Southern Ocean. Data available: two excel files containing sampling dates and depths, raw counts, relative abundance and fluxes (coccoliths m-2 d-1) of the coccolithophore species, and morphometric measurements of Emiliania huxleyi coccoliths made with C-Calcita software. Each file contains four spreadsheets: raw coccolith counts, relative abundance of coccolithophore species and coccolith flux of each coccolithophore species identified and E. huxleyi morphometrics. Detailed information of the column headings is provided below. Cup – Cup (=sample) number Depth – vertical location of the sediment trap in meters below the surface Mid-point date - Mid date of the sampling interval Length (days) – number of days the cup was open

Files and APIs

Tags

Additional Info

Field Value
Title Coccolithophore species fluxes in the Australian sector of the southern Antarctic Zone
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/934d4018-9e32-4f1c-88ea-a5df4a91b213
Contact Point
CSIRO Oceans & Atmosphere
metadata@aad.gov.au
Reference Period 30/11/2001 - 29/09/2002
Geospatial Coverage {"type": "Polygon", "coordinates": [[[139.88, -60.75], [139.9, -60.75], [139.9, -60.745], [139.88, -60.745], [139.88, -60.75]]]}
Data Portal data.gov.au

Data Source

This dataset was originally found on data.gov.au "Coccolithophore species fluxes in the Australian sector of the southern Antarctic Zone". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/coccolithophore-species-fluxes-in-the-australian-sector-of-the-southern-antarctic-zone

Original dataset
Dataset copies

No duplicate datasets found.