K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean
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...
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Australian Ocean Data Network
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Online Access: | https://researchdata.ands.org.au/k-axis-dissolved-southern-ocean/1307269 https://data.aad.gov.au/metadata/records/AAS_4344_dFe https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_dFe https://data.aad.gov.au/eds/4595/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 |
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ftands:oai:ands.org.au::1307269 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY TRACE ELEMENTS GO-FLO BOTTLES SHIPS R/V AA > R/V Aurora Australis R/V UM > R/V UMITAKA MARU ACE/CRC AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR CONTINENT > ANTARCTICA OCEAN > SOUTHERN OCEAN > Banzare Bank INDIAN OCEAN > KERGUELEN ISLANDS |
spellingShingle |
oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY TRACE ELEMENTS GO-FLO BOTTLES SHIPS R/V AA > R/V Aurora Australis R/V UM > R/V UMITAKA MARU ACE/CRC AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR CONTINENT > ANTARCTICA OCEAN > SOUTHERN OCEAN > Banzare Bank INDIAN OCEAN > KERGUELEN ISLANDS K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean |
topic_facet |
oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY TRACE ELEMENTS GO-FLO BOTTLES SHIPS R/V AA > R/V Aurora Australis R/V UM > R/V UMITAKA MARU ACE/CRC AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR CONTINENT > ANTARCTICA OCEAN > SOUTHERN OCEAN > Banzare Bank INDIAN OCEAN > KERGUELEN ISLANDS |
description |
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. 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. Supply dissolved iron data for the K-axis region. Complimentary to other K-axis data. |
author2 |
AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) |
format |
Dataset |
title |
K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean |
title_short |
K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean |
title_full |
K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean |
title_fullStr |
K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean |
title_full_unstemmed |
K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean |
title_sort |
k-axis dissolved iron (dfe) data from the kerguelen-axis region of the southern ocean |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.ands.org.au/k-axis-dissolved-southern-ocean/1307269 https://data.aad.gov.au/metadata/records/AAS_4344_dFe https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_dFe https://data.aad.gov.au/eds/4595/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 |
op_coverage |
Spatial: northlimit=-57; southlimit=-66; westlimit=70; eastLimit=95 Temporal: From 2017-01-10 to 2018-02-28 |
long_lat |
ENVELOPE(77.733,77.733,-58.833,-58.833) ENVELOPE(70,95,-57,-66) |
geographic |
Banzare Bank Indian Kerguelen Kerguelen Islands Southern Ocean |
geographic_facet |
Banzare Bank Indian Kerguelen Kerguelen Islands Southern Ocean |
genre |
Antarc* Antarctica aurora australis Kerguelen Islands Southern Ocean |
genre_facet |
Antarc* Antarctica aurora australis Kerguelen Islands Southern Ocean |
op_source |
https://data.aad.gov.au |
op_relation |
https://researchdata.ands.org.au/k-axis-dissolved-southern-ocean/1307269 5b937cbf-8d23-4778-840e-092fb5525b45 https://data.aad.gov.au/metadata/records/AAS_4344_dFe https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_dFe https://data.aad.gov.au/eds/4595/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 |
_version_ |
1766246193881415680 |
spelling |
ftands:oai:ands.org.au::1307269 2023-05-15T13:47:00+02:00 K-axis dissolved iron (dFe) data from the Kerguelen-Axis region of the Southern Ocean AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) Spatial: northlimit=-57; southlimit=-66; westlimit=70; eastLimit=95 Temporal: From 2017-01-10 to 2018-02-28 https://researchdata.ands.org.au/k-axis-dissolved-southern-ocean/1307269 https://data.aad.gov.au/metadata/records/AAS_4344_dFe https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_dFe https://data.aad.gov.au/eds/4595/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 unknown Australian Ocean Data Network https://researchdata.ands.org.au/k-axis-dissolved-southern-ocean/1307269 5b937cbf-8d23-4778-840e-092fb5525b45 https://data.aad.gov.au/metadata/records/AAS_4344_dFe https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_dFe https://data.aad.gov.au/eds/4595/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 https://data.aad.gov.au oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY TRACE ELEMENTS GO-FLO BOTTLES SHIPS R/V AA > R/V Aurora Australis R/V UM > R/V UMITAKA MARU ACE/CRC AMD/AU AMD CEOS GEOGRAPHIC REGION > POLAR CONTINENT > ANTARCTICA OCEAN > SOUTHERN OCEAN > Banzare Bank INDIAN OCEAN > KERGUELEN ISLANDS dataset ftands 2020-01-05T21:55:11Z 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. 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. Supply dissolved iron data for the K-axis region. Complimentary to other K-axis data. Dataset Antarc* Antarctica aurora australis Kerguelen Islands Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Banzare Bank ENVELOPE(77.733,77.733,-58.833,-58.833) Indian Kerguelen Kerguelen Islands Southern Ocean ENVELOPE(70,95,-57,-66) |