K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean

Sampling was conducted according to GEOTRACES protocols. Samples for trace element analyses, including dissolved iron (dFe), were filtered through acid-cleaned 0.2 um cartridge filters (Pall Acropak) under constant airflow from several ISO class 5 HEPA units. All plastic ware was acid-cleaned prior to use, following GEOTRACES protocols. Samples were collected into low-density polyethylene (LDPE) bottles, acidified immediately to pH 1.7 with Seastar Baseline hydrochloric acid (HCl), double-bagged and stored at room temperature until analysis on shore.


Samples for dFe analysis were pre-concentrated offline (factor 40) on a SeaFAST S2 pico (ESI, Elemental Scientific, USA) flow injection system with a Nobias Chelate-PA1 column. Samples were eluted from the column in 10% distilled nitric acid (HNO3), with calibration based on the method of standard additions in seawater (made using multi-element standards in a 10% HNO3 matrix, rather than an HCl matrix). Pre-concentrated samples were analysed using Sector Field Inductively Coupled Plasma Mass Spectrometry (SF-ICP-MS, Thermo Fisher Scientific, Inc.). Data were blank-corrected by subtracting an average acidified milli-Q blank that was treated similarly to the samples.


The dFe detection limit for a given analysis run on the SeaFAST/SF-ICP-MS was calculated as 3 x standard deviation of the milli-Q blank on that run. Detection limits ranged from 0.016 to 0.067 nmol kg-1, with a median of 0.026 nmol kg-1 (n=12). GEOTRACES reference materials were analyzed along with samples and results were in good agreement with consensus values: SAFe D1 was measured at 0.69 +/- 0.05 nmol kg-1 (n=7; consensus value = 0.67 +/- 0.04 nmol kg-1) and GD was measured at 1.02 +/- 0.01 nmol kg-1 (n=6; consensus value = 1.00 +/- 0.1 nmol kg-1).


Comments regarding the data spreadsheet:

NaN = no sample

dFe QC flags: 1 = high confidence in data quality

2 = detection limit

3 = low confidence in data quality

detection limits: dFe data that were below the daily detection limit were replaced with the respective detection limit. They are flagged with the number 2 in the dFe QC flag column.

Simple

Identification info

Alternate title
K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean
Date (Publication)
2018-06-08
Edition
1
Citation identifier
Dataset DOI

Title
Information and documentation - Digital object identifier system
Date (Publication)
2012-04-23
Citation identifier
ISO 26324:2012

Citation identifier
doi:10.4225/15/5a77d6bd5975e

Originator

Schallenberg, C. and Bowie, A.

Publisher

Australian Antarctic Data Centre

Principal investigator

SCHALLENBERG, CHRISTINA
University of Tasmania
Hobart
Tasmania
7001
Australia

Principal investigator

BOWIE, ANDREW ROSS
IASOS and Antarctic CRC
Private Bag 80
University of Tasmania
Hobart
Tasmania
7001
Australia

Collaborator

SCHALLENBERG, CHRISTINA
University of Tasmania
Hobart
Tasmania
7001
Australia

Collaborator

BOWIE, ANDREW ROSS
IASOS and Antarctic CRC
Private Bag 80
University of Tasmania
Hobart
Tasmania
7001
Australia
Name
CAASM Metadata
Website
https://data.aad.gov.au/metadata/records/AAS_4344_dFe

Purpose
Supply dissolved iron data for the K-axis region. Complimentary to other K-axis data.
Status
Completed

Custodian

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia
Topic category
  • Oceans

Extent

N
S
E
W


Extent

Description
Temporal Coverage

Temporal extent

TimePeriod
2017-01-10 2018-02-28
NASA/GCMD Earth Science Keywords
  • EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS
  • EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > TRACE ELEMENTS
NASA/GCMD Earth Science Keywords
  • GO-FLO BOTTLES
NASA/GCMD Earth Science Keywords
  • SHIPS
  • R/V AA > R/V Aurora Australis
  • R/V UM > R/V UMITAKA MARU
NASA/GCMD Earth Science Keywords
  • ACE/CRC
  • AMD/AU
  • AMD
  • CEOS
NASA/GCMD Earth Science Keywords
  • GEOGRAPHIC REGION > POLAR
  • CONTINENT > ANTARCTICA
  • OCEAN > SOUTHERN OCEAN > Banzare Bank
  • OCEAN > INDIAN OCEAN > KERGUELEN ISLANDS

Resource constraints

Use limitation
This metadata record is publicly available.

Resource constraints

Access constraints
licence
Other constraints
These data are publicly available for download from the provided URL.

Resource constraints

File type
Portable Network Graphic
Linkage
Creative Commons by Attribution logo

Title
Attribution 4.0 International (CC BY 4.0)
Website
https://creativecommons.org/licenses/by/4.0/legalcode

Legal code for Creative Commons by Attribution 4.0 International license

Use constraints
licence
Other constraints
This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_dFe when using these data.
Language
English
Character encoding
UTF8

Distribution Information

Distributor

Distributor

AU/AADC > Australian Antarctic Data Centre, Australia - AADC, DATA OFFICER (DATA CENTER CONTACT)
Australian Antarctic Division
203 Channel Highway
Kingston
Tasmania
7050
Australia

Distributor

Fees
Free
Planned available datetime
2018-06-08T00:00:00
Units of distribution
MB
Transfer size
1.2
Distribution format
  • csv, Word

OnLine resource
GET DATA

Download the data

OnLine resource
PROJECT HOME PAGE

Public information for AAS project AAS_4344

OnLine resource
VIEW RELATED INFORMATION

Citation reference for this metadata record and dataset.

Resource lineage

Statement
No problems with analysis, but there were a lot of problems with GO-FLO bottles during sampling, i.e. bottles either not closing or leaking on arrival on deck. As a result, there is a large number of missing samples (NaN), and we also took some salinity samples for additional data quality control as follows: A subset of salinity samples (n=124) was taken from GO-FLO bottles to check whether bottles had closed at the expected depths and/or whether there were problems with leaking. Salinity samples were compared to CTD salinities, and samples where measured salinity did not match the respective CTD salinity (n=9) were flagged as suspect and are not included in the data sheet. Note that salinity checks were predominantly performed on GO-FLO bottles that were suspicious (e.g. leaking), so they do not represent a random set of samples.
Hierarchy level
Dataset
Maintenance and update frequency
As needed
Maintenance note
2018-02-05 - record created by Christina Schallenberg. 2018-06-08 - record updated by Dave Connell to publicly release the data.

Metadata

Metadata identifier
string/AAS_4344_dFe

Language
English
Character encoding
UTF8

Author

SCHALLENBERG, CHRISTINA
University of Tasmania
Hobart
Tasmania
7001
Australia

Sponsor

Australian Antarctic Division

Owner

AADC

Type of resource

Resource scope
Dataset

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Citation identifier
5b937cbf-8d23-4778-840e-092fb5525b45

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Date (Last Revision)
2021-11-17T12:22:29

Identifier

Description
metadata.extraction_date

Alternative metadata reference

Title
gov.nasa.gsfc.gcmd
Citation identifier
8.6

Metadata linkage
http://data.aad.gov.au/metadata/records/AAS_4344_dFe

Point of truth for the metadata record

Date info (Creation)
2018-02-05T00:00:00
Date info (Last Update)
2018-06-08

Metadata standard

Title
ISO 19115-3
Edition
2014
Other citation details
Version 1
Title
DIF to ISO 19115-1 Profile
 
 

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