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Coccolithophore species fluxes in the Australian sector of the southern Antarctic Zone
Entry ID: Coccolithophore_Fluxes_SAZ


Summary
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

Related URL
Link: View Related Information
Description: Citation reference for this metadata record and dataset.


Link: View Related Information
Description: Download the dataset

Geographic Coverage
 N: -60.745 S: -60.75  E: 139.9  W: 139.88

Data Set Citation
Dataset 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
Version: 1
Online Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...


Temporal Coverage
Start Date: 2001-11-30
Stop Date: 2002-09-29


Location Keywords
GEOGRAPHIC REGION > POLAR
OCEAN > SOUTHERN OCEAN


Science Keywords
BIOLOGICAL CLASSIFICATION >PLANTS >MICROALGAE >HAPTOPHYTES >COCCOLITHOPHORES    [Definition]
BIOLOGICAL CLASSIFICATION >PROTISTS >FLAGELLATES >HAPTOPHYTES >COCCOLITHOPHORES    [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS >SPECIES/POPULATION INTERACTIONS >POPULATION DYNAMICS    [Definition]
OCEANS >MARINE SEDIMENTS >PARTICLE FLUX    [Definition]


Platform
MOORINGS    [Information]


Instrument
SEDIMENT TRAPS    [Information]


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.


Keywords
FLUX
SOUTHERN OCEAN IRON RELEASE EXPERIMENT
SOIREE
SONAR-CO2


Data Set Progress
COMPLETE


Originating Center
Antarctic Climate and Ecosystems CRC


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 23 kb
Distribution_Format: Excel
Fees: Free


Personnel
ANDRES S. RIGUAL-HERNANDEZ
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Email: arigual at usal.es
Contact Address:
Department of Geology
Universidad de Salamanca
Postal Code: 37008
Country: Spain


THOMAS WILLIAM TRULL
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +61 3 6226 2988
Fax: +61 3 6226 2973
Email: tom.trull at utas.edu.au
Contact Address:
Antarctic CRC University of Tasmania
GPO BOX 252-80
City: Hobart
Province or State: Tasmania
Postal Code: 7001
Country: Australia


Publications/References
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



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