The role of iron as a micro-nutrient to the Antarctic sea-ice zone algal community

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Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: The role of iron as a micro-nutrient to the Antarctic sea-ice zone algal community
Description:
Abstract:
Metadata record for data from AAS (ASAC) project 3026. Public This project will assess the importance of the trace micro-nutrient element iron to Antarctic sea-ice algal communities during the International Polar Year (2007-2009). We will investigate the biogeochemistry of iron, including a comprehensive examination of its distribution, speciation, cycling and role in fuelling ice-edge phytoplankton blooms. A significant part of this research will concentrate on the the influence of organic exopolysaccharides on iron solubility, complexation and bioavailability, both within the ice and in surrounding snow and surface seawater. This innovative research will improve our understanding of key processes that control the productivity of the climatically-important Antarctic sea-ice zone. Project objectives: This project will assess the importance of the trace element iron (Fe) as a micro-nutrient to seasonal sea-ice algal communities in the Australian sector of Antarctica during the International Polar Year (2007-09). We will investigate the biogeochemistry of Fe, including a comprehensive examination of its distribution, speciation, cycling and role in fuelling ice-edge phytoplankton blooms. A significant part of this research will concentrate on the influence of organic exopolysaccharides (EPS) on Fe solubility and complexation (and hence bioavailability), both within the ice and in surrounding surface waters. This innovative research will improve our understanding of key processes that control the productivity of the climatically-important Antarctic sea-ice zone. Specifically, in this project: - The biogeochemical behaviour of Fe in sea-ice with regards to EPS complexation, and key physicochemical and biological data will be evaluated. - The bioavailability of Fe for phytoplankton growth during sea-ice melt will be investigated through laboratory-based experiments designed to mimic spring conditions. - The distribution of other bioactive trace elements in the Antarctic sea-ice environment will be examined as a means of fingerprinting the source(s) of Fe, as well as indicating their biological requirement. Taken from the 2008-2009 Progress Report: Progress against objectives: In the last twelve months we achieved all the objectives planned for the shore-based sample processing and analysis from the SIPEX voyage (fieldwork September-October 2007). An extensive and unique seasonal and spatial data set was put together including parameters such as ice texture, salinity, temperature, Chlorophyll a, particulate organic carbon (POC), dissolved organic carbon (DOC), macro-nutrients (silicate, phosphate and nitrate), and exoplysaccharides (EPS, using both alcian blue and PSA methods). Dissolved iron (dFe) and total dissolvable iron (TDFe) were analysed by flow injection - chemiluminescence (FIA-CL) analysis in Hobart. Polycarbonate (PC) filters (Nuclepore 0.2 micron pore size) retaining particulate metals were digested in a mixture of strong, ultrapure acids (750 micro litre 12N HCl, 250 micro litre 40% HF, 250 micro litre 14N HNO3) on a hotplate at 125 degrees C for 8 h. The procedure was successfully applied to plankton, estuarine and river sediment reference materials to verify the recovery of the digestion treatment. The concentrations of particulate iron (PFe) were determined by high resolution ICP-MS at the Central Science Laboratory at UTAS. This data has been quality-controlled, analysed, interpreted and published (see below). Due to the fact that logistical support was not possible for 2008/09 (insufficient berths at Casey Station) despite approval of our project, the field component of the project was delayed. Taken from the 2009-2010 Progress Report: Progress against objectives: Monthly Milestones of PhD student Pier van der Merwe: Successful Antarctic research expedition occurred in Oct-Dec 2009 at Casey Station Antarctica with logistical support from AAS project #3026 (flight on FA02 and berths at Casey station as well as field support of personnel). OCT-DEC 2009 - Antarctic time series data collection and processing successful. Data analysis scheduled for Jan - Mar. Write up of last paper(s) scheduled for Mar-June. Final completion of thesis due in August. DEC - Chlorophyll a data analysed JAN - FIA and CLECSV analyses start simultaneously FEB - Finish FIA analyses and attend Ocean science meeting in Portland Oregon. MAR - Finish CLECSV analyses and run POC and PFe digestions and analyses. Scheduled with Thomas Rodemann and Ashley Townsend at the CSL, UTAS. APR - MAY Data analysis and write up of 3rd paper, and possibly 4th based on field work at Casey station Oct-Dec 2009. See the child metadata records for more information about the data.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: van der Merwe, P., Lannuzel, D., Bowie, A., Mancuso Nichols, C. and Meiners, K. Unknown Iron fractionation in pack and fast ice in East Antarctica: temporal decoupling between the release of dissolved and particulate iron during spring melt. Deep-Sea Research Part II Oceanographic Research Papers
Supplemental_Information:
REFERENCE: van der Merwe, P., Lannuzel, D., Mancuso Nichols, C., Meiners, K., Heil, P., Norman, L., Thomas, D.N. and Bowie, A. 2009 Biogeochemical observations during the winter-spring transition in East Antarctic sea ice: evidence of iron and exopolysaccharide controls. Marine Chemistry 115 163-175
Supplemental_Information:
REFERENCE: van der Merwe, P., Lannuzel, D., Bowie, A., Mancuso Nichols, C., Meiners, K., Townsend, A. Unknown Temporal study of Fe flux from fast ice in East Antarctica during austral summer melt. Biogeosciences Discussions In preparation
Supplemental_Information:
REFERENCE: Lannuzel, D., Schoemann, V., de Jong, J., Pasquer, B., Masson, F., van der Merwe, P., Tison, J.L. and Bowie, A. Unknown What controls the distribution of dissolved iron in Antarctic sea ice: spatial, seasonal or inter-annual variability? Journal of Geophysical Research-Biogeosciences. Accepted.
Supplemental_Information:
REFERENCE: Norman, L., Thomas, D.N., Stedmon, C.A., Granskog, M.A., Papadimitriou, S., Krapp, R.H., Meiners, K., Lannuzel, D., van der Merwe, P. and Dieckmann, G. Unknown The characteristics of dissolved organic matter (DOM) and chromophoric dissolved organic matter (CDOM) in Antarctic sea ice. Deep-Sea Research Part II Oceanographic Research Papers.
Supplemental_Information:
REFERENCE: Lannuzel D., Bowie A.R., van der Merwe P., Townsend A., and Schoemann V. 2010 Dissolved and particulate metals in Antarctic sea ice and their role in tracing Fe sources Marine Chemistry In preparation
Supplemental_Information:
REFERENCE: Lannuzel D., Bowie A.R. and van der Merwe P. 2010 Size fractionation of trace metals during a time series in land-fast ice, Antarctica. Marine Chemistry In preparation
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20070911
Ending_Date: 20100331
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 110.48
East_Bounding_Coordinate: 127.95
North_Bounding_Coordinate: -64.22
South_Bounding_Coordinate: -66.32
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > ICE DEPTH/THICKNESS
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > ICE FLOES
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > ICE TEMPERATURE
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > ICE TYPES
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > PACK ICE
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > ICE DEPTH/THICKNESS
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SNOW/ICE
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE ENVIRONMENT MONITORING
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > BIOGEOCHEMICAL CYCLES
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC CARBON
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC MATTER
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > TRACE ELEMENTS
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
Theme_Keyword: EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY
Theme_Keyword: EARTH SCIENCE > OCEANS > SEA ICE
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > SNOW DEPTH
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > SALINITY
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > ISOTOPES
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > ICEBERGS
Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL
Theme_Keyword: FIELD SURVEYS
Theme_Keyword: SHIPS
Theme_Keyword: CORING DEVICES
Theme_Keyword: PROBES
Theme_Keyword: TEMPERATURE PROBES
Theme_Keyword: AUTOANALYZER
Theme_Keyword: CHN ANALYZERS > CARBON, HYDROGEN, NITROGEN ANALYZERS
Theme_Keyword: Sea-ice Zone
Theme_Keyword: Iron
Theme_Keyword: Sea Ice
Theme_Keyword: Eps
Theme_Keyword: Micro-nutrient
Theme_Keyword: BIOTA
Theme_Keyword: ENVIRONMENT
Theme_Keyword: OCEANS
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: OCEAN > SOUTHERN OCEAN
Place_Keyword: CONTINENT > ANTARCTICA
Place_Keyword: GEOGRAPHIC REGION > POLAR
Access_Constraints: Data are available for download via the child records.
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=ASAC_3026 when using these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: THOMAS WILLIAM TRULL
Contact_Position: INVESTIGATOR
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: GPO BOX 252-80
Address: Antarctic CRC University of Tasmania
City: Hobart
State_or_Province: Tasmania
Postal_Code: 7001
Country: Australia
Contact_Voice_Telephone: +61 3 6226 2988
Contact_Facsimile_Telephone: +61 3 6226 2973
Contact_Electronic_Mail_Address: tom.trull@utas.edu.au
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The values provided in temporal and spatial coverage are approximate only. In the 2007/2008 Season significant work on this project was carried out on the SPIEX voyage - (Sea Ice Physics and Ecosystems eXperiment). See the child metadata record for more information. Taken from the 2008-2009 Progress Report: Laboratory activity/analysis: Laboratory activity included analysis of exopolysaccharides (EPS) using the PSA and alcian blue methods, and showed good agreement with previously published data. Dissolved iron (less than 0.2 microns) and total dissolvable iron (unfiltered) were measured using a FIA-CL method adapted to high gradients of salinity and concentrations. Polycarbonate (PC) filters (Nuclepore 0.2 micron pore size) retaining particulate metals were digested in a mixture of strong, ultrapure acids (750 micro litre 12N HCl, 250 micro litre 40% HF, 250 micro litre 14N HNO3) on a hotplate at 125 degrees C for 8 h. The procedure was successfully applied to plankton, estuarine and river sediment reference materials to verify the recovery of the digestion treatment. The concentrations of particulate iron (PFe) were determined by high resolution ICP-MS at the Central Science Laboratory at UTAS. All analytical milestones were successfully completed, data compiled and prepared for publication. Difficulties affecting project: The second part of the project (field sampling at Casey) was not achieved during austral spring 2008, due to unavailability of berths at Casey Station. Taken from the 2009-2010 progress report: Field work: The collection of a time series of Antarctic coastal sea ice was completed off the coast of Casey station Antarctica between Oct and Dec 2009. Two researchers, Pier van der Merwe and Delphine Lannuzel were flown into Casey station on FA02. Lab facilities were provided for sample processing and trained staff supplied to escort the researchers into the field via Hagglunds. Sample processing and analysis is 90% completed and the write up of the data is occurring currently and the first paper based on the Fe size fractionation and release during sea ice melt should be finished by early August.
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: AU/AADC > Australian Antarctic Data Centre, Australia
Contact_Person: DATA OFFICER AADC
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Australian Antarctic Division
Address: 203 Channel Highway
City: Kingston
State_or_Province: Tasmania
Postal_Code: 7050
Country: Australia
Contact_Voice_Telephone: +61 3 6232 3244
Contact_Facsimile_Telephone: +61 3 6232 3351
Contact_Electronic_Mail_Address: metadata@aad.gov.au
Resource_Description: ASAC_3026
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://data.aad.gov.au
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://secure3.aad.gov.au/proms/public/projects/r...
Access_Instructions:
Public information for ASAC project 3026
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://data.aad.gov.au/aadc/metadata/citation.cfm?...
Access_Instructions:
Citation reference for this metadata record and dataset.
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20090427
Metadata_Review_Date: 20140110
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: DAVE J. CONNELL
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Australian Antarctic Division
Address: 203 Channel Highway
City: Kingston
State_or_Province: Tasmania
Postal_Code: 7050
Country: Australia
Contact_Voice_Telephone: +61 3 6232 3244
Contact_Facsimile_Telephone: +61 3 6232 3351
Contact_Electronic_Mail_Address: dave.connell@aad.gov.au
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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