Coccolithophore species fluxes in the Australian sector of the southern Antarctic ZoneEntry ID: Coccolithophore_Fluxes_SAZ
Abstract: 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
Data Set Citation
Dataset Originator/Creator: Rigual-Hernandez, A.S. and Trull, T.W.
Dataset Title: Coccolithophore species fluxes in the Australian sector of the southern Antarctic Zone
Dataset Series Name: CAASM Metadata
Dataset Release Date: 2018-03-28
Dataset Publisher: Australian Antarctic Data Centre
Dataset DOI: doi:10.4225/15/5ab86f35e277eOnline Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...
Start Date: 2001-11-30Stop Date: 2002-09-29
Access Constraints These data are publicly available for download from the provided URL.
Use Constraints This data set conforms to the PICCCBY Attribution License (http://creativecommons.org/licenses/by/3.0/).
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=Coccolit... when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 23 kb
Distribution Format: Excel
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Email: arigual at usal.es
Department of Geology Universidad de Salamanca
Postal Code: 37008
Role: TECHNICAL CONTACT
Phone: +61 3 6226 2988
Fax: +61 3 6226 2973
Email: tom.trull at utas.edu.au
Antarctic CRC University of Tasmania GPO BOX 252-80
Province or State: Tasmania
Postal Code: 7001
Rigual-Hernandez, A.S., Flores, J.A., SIerro, F. J., Fuertes, A., Cros, L. and, Trull, T. W. (2018), Coccolithophore populations and their contribution to carbonate export during an annual cycle in the Australian sector of the Antarctic Zone., Biogeosciences
Rigual-Hernandez, A.S., Trull, T.W., Bray, S.G., Closset, I., Armand, L.K. (2015), Seasonal dynamics in diatom and particulate export fluxes to the deep sea in the Australian sector of the southern Antarctic Zone., Journal of Marine Systems, 142, 62-74
Extended Metadata Properties
(Click to view more)
Creation and Review Dates
DIF Creation Date: 2018-03-26
Last DIF Revision Date: 2018-04-05