This record describes Hydrology (HYD) data collected collected from the Marine National Facility RV Investigator Voyage IN2018_V02, titled: "SOTS: Southern Ocean Time Series automated moorings for climate and carbon cycle studies south west Tasmania; Subantarctic Biogeochemistry of Carbon and Iron." The voyage took place between March 3 and March 21, 2018 departing from Hobart (TAS) and arriving in Hobart.
Water samples collected during the voyage were assayed in the ship’s hydrochemistry laboratory for nutrients, dissolved oxygen, and their salinity measured. The samples came from deployments of the CTD rosette and trace metal rosette as well as from experiments run by the science party.
Results for nutrient samples from experiments issued to the science parties during the voyage.
Final hydrology data, analytical methods, and related log sheets and processing notes can be obtained from the CSIRO data centre.
This dataset has been archived at the CSIRO O&A Information and Data Centre (IDC) in Hobart. Additional information regarding this dataset is contained in the Voyage Report and Data Processing Report.
This data was collected by participants on the Marine National Facility (MNF) RV Investigator voyage IN2018_V02
The data was processed by Peter Hughes (CSIRO O&A)
Data archived by Vito Dirita (CSIRO O&A).
Data source: original field data.
See in2018_v02_HYD_ProcessingReport.pdf document for method details.
(1) 7 CTD stations were sampled with a 36 bottle rosette, (12L).
(2) Nutrient samples were analysed using segmented flow SEAL AA3HR and results are in µmol/L.
(3) Salinities were analysed using Guildline 8400B Autosal Lab Salinometer and OSIL software. The salinometer was calibrated with IAPSO standard seawater P161.
(4) Dissolved Oxygens were analysed using Scripps UV titrator and software, units measured in ml/L and converted to µmol/L. Dissolved oxygen was analysed using in-house method SOP 005.
CTD: Sampling point, 36 bottle rosette with 12L Ocean Test Equipment bottles deployed at depth for water collection. 7 CTD deployments in total. Deployments 2 thru 6 sampled and assayed by hydrochemistry
TMR: Sampling point, 12 bottle trace metals rosette. 5 deployments in total. Sampled by the trace metals team, assayed by hydrochemistry
EXP: Prepared and sampled by the science groups conducting the experiments, assayed by hydrochemistry.
All data was processed with HyPro 5.4.
Nutrient data decimal places within the CSV file; silicate is 1 decimal place, nitrite is 3 decimal places and NOx (nitrate + nitrite), phosphate and ammonium is 2 decimal places.
Previously values below detection limit were set to zero these values are now displayed as the measured value even if that is a negative value. Oxygen Data is displayed to 3 decimal places. Salinity data is displayed to 4 decimal places, prior to in2018_t01 voyage it was 3 decimal places in the csv file. Data processing notes are in the process report (in2018_v02_HYD_ProcessReport.pdf).
See hydrochemistry data processing report (and supporting documentation) for more information on each analysis and the corresponding data.