CTD profiles and underway seawater samples from INVT01_2024 (KSA324 assessment 2024)

This record describes the conductivity-temperature-depth (CTD) data and underway water sample data collected during the CSIRO Investigator transit voyage INVTO1_2024, between 9 March and 20 March 2024. The objective of the voyage was for a safe transit from Fremantle, Western Australia, to Hobart, Tasmania. This record was part of a piggyback project whereby undergraduate students attained at-sea training through the Institute of Marine and Antarctic Studies and the University of Tasmania. The project aim was for students to gain experience with oceanographic data collection, processing and analysis. The CTD data includes 7 CTD profiles that measured conductivity, temperature, pressure, dissolved oxygen, salinity, fluorescence, turbidity and photosynthetically active radiation (PAR). Each of these parameters were collected during each CTD profile. The CTD data also includes calculated measurements of ammonium, nitrate, nitrite, phosphate, silicate, as well as chlorophyll-a, from select rosette bottles. The underway water sample data includes 41 duplicate samples of calculated measurements of chlorophyll-a and associated calculated measurements of ammonium, nitrate, nitrite, phosphate and silicate nutrient concentrations. In both data files, ODV quality flags have been used to indicate data quality.

Simple

Identification info

Date (Publication)
2025-05-27T00:00:00

Resource provider

Institute for Marine and Antarctic Studies (IMAS)
Private Bag 129
Hobart
Tasmania
7001
Australia

Author

Institute for Marine and Antarctic Studies - Nawrath, Katie
IMAS - Hobart
Private Bag 129
Hobart
TAS
7001
Australia
Credit
This research was supported by a grant of sea time on RV Investigator from the CSIRO Marine National Facility (https://ror.org/01mae9353).
Credit
This research was also supported by the Institute for Marine and Antarctic Studies through the University of Tasmania.
Credit
KSA224/324 Oceanographic Methods class 2024 (IMAS)
Status
Completed

Author

Institute for Marine and Antarctic Studies - Nawrath, Katie
Private Bag 129
Hobart
TAS
7001
Australia

Point of contact

Institute for Marine and Antarctic Studies - van der Merwe, Pier
Private Bag 129
Hobart
TAS
7001
Australia
ORCID ID >

Topic category
  • Oceans

Extent

N
S
E
W


N
S
E
W


N
S
E
W


N
S
E
W


N
S
E
W


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Temporal extent

Time period
2024-03-09 2024-03-20

Vertical element

Minimum value
15
Maximum value
6021
Identifier
EPSG::5715
Name
MSL depth
Maintenance and update frequency
Not planned
Keywords (Theme)
  • CTD
  • PAR
  • UNDERWAY
Global Change Master Directory Earth Science Keywords, Version 8.5
Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research

Resource constraints

Use limitation
Data, products and services from IMAS are provided "as is" without any warranty as to fitness for a particular purpose.

Resource constraints

Linkage
https://licensebuttons.net/l/by/4.0/88x31.png

License Graphic

Title
Creative Commons Attribution 4.0 International License
Alternate title
CC-BY
Edition
4.0


>

Website
https://creativecommons.org/licenses/by/4.0/

License Text

Other constraints
The citation in a list of references is: "Citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link)."
Language
English
Character encoding
UTF8

Content Information

Content type
Physical measurement

Identifier

Code
CTD Number
Name
CTD_No

Name
Number

Identifier

Code
Bottle number
Name
Bottle

Name
No units

Identifier

Code
Latitude
Name
latitude

Name
Decimal degrees

Identifier

Code
Longitude
Name
longitude

Name
Decimal degrees

Identifier

Code
Pressure Interval
Name
PressureInterval

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPDB
Name
Decibars

Identifier

Code
Temperature of the water body
Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPAA
Name
Degrees Celsius

Identifier

Code
Electrical conductivity of the water body
Name
c0sm

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UECA
Name
Siemens per metre

Identifier

Code
Concentration of oxygen {O2} per unit volume of the water body
Name
sbeox0Mm/L and sbeox1Mm/L

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPOX
Name
Micromoles per litre

Identifier

Code
Practical salinity of the water body
Name
sal00 and sal11

Identifier
http://vocab.aodn.org.au/def/unitsofmeasure/entity/481
Name
Practical Salinity Unit

Identifier

Code
Scan count
Name
scan

Name
No units

Identifier

Code
Time elapsed
Name
timeS

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UTBB
Name
Seconds

Identifier

Code
Fluorescence of the water body
Name
flECO-AFL

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UMMC
Name
Milligrams per cubic metre

Identifier

Code
Turbidity of the water body
Name
turbWETbb0

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/PMSR
Name
Per metre per steradian

Identifier

Code
Downwelling vector irradiance as photons (PAR wavelengths) in the water body
Name
par

Name
micromoles photons per metre squared per second

Identifier

Code
Colored Dissolved Organic Matter
Name
wetCDOM

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UMMC
Name
Milligrams per cubic metre

Identifier

Code
Beam Transmission
Name
CStarTr0

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPCT
Name
Percent

Identifier

Code
Data quality flag
Name
flag

Name
ODV Flag Units

Identifier

Code
Concentration of ammonium {NH4} per unit volume of the water body
Name
NH4_uM

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPOX
Name
Micromoles per litre

Identifier

Code
Concentration of nitrate and nitrite {NO3 and NO2} per unit volume of the water body
Name
NOx_uM

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPOX
Name
Micromoles per litre

Identifier

Code
Concentration of nitrite {NO2} per unit volume of the water body
Name
Nitrite_uM

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPOX
Name
Micromoles per litre

Identifier

Code
Concentration of phosphate {PO4} per unit volume of the water body
Name
PO4_uM

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPOX
Name
Micromoles per litre

Identifier

Code
Concentration of silicate {SiO4} per unit volume of the water body
Name
Silicate_uM

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UPOX
Name
Micromoles per litre

Identifier

Code
Concentration of chlorophyll-a per unit volume of the water body
Name
Chla

Identifier
http://vocab.nerc.ac.uk/collection/P06/current/UMMC
Name
Milligrams per cubic metre

Identifier

Code
Time
Name
Time_UTC

Name
UTC

Identifier

Code
Sample ID
Name
Sample_ID

Name
No units

Distribution Information

Distribution format
  • csv

OnLine resource
Methods for reproducible shipboard SFA nutrient measurement using RMNS and automated data processing

OnLine resource
DATA DOWNLOAD - Raw CTD Data (CSV 5.3MB)

OnLine resource
DATA DOWNLOAD - Finalised CTD Data (CSV 8.8KB)

Resource lineage

Statement
CTD Profiles: The Seabird 911plus CTD was deployed at seven stations along the voyage track. Two of the seven CTD profiles were to depths greater than 6000m. The CTD sensors were set up in duplicate to manage any redundancy. The seabird sensors measured dissolved oxygen, pH, turbidity, fluorescence, oil, PAR, nitrates, altimeter in real time. Once the CTD was returned aboard, seawater samples were collected from select rosettes for analysis of dissolved oxygen, salinity, nutrients, and chlorophyll-a. Underway water sampling: Chlorophyll-a and nutrient analysis was performed on 41 duplicate underway seawater samples collected from the underway seawater line. Each chlorophyll-a sample was collected in pre-rinsed 2L bottles and subsequently decanted into a 1L graduated cylinder. The samples were then filtered through a manifold with a funnel tower, using Whatman 25mm GF/F filters. Following filtration, filters were carefully removed using stainless steel forceps and transferred to glass scintillation vials. 10ml of cold 90% acetone was added to each vial and stored at -20 degrees Celsius. Non-acidified Chlorophyll a technique: Chlorophyll concentrations were determined using the non-acidification technique for extracted chlorophyll a (Turner Designs 2023). After 24 hours, samples were removed from the freezer, brought to room temperature by inversion and transferred to fluorometer vials. Three raw fluorescence values were taken using a Turner Trilogy fluorometer. Filters within the fluorometer are selective for chlorophyll-a. Prior to fluorescence measurement, three 90% acetone blanks were read, and occasional readings from a solid standard were taken to monitor instrument drift over time. Any acetone waste generated during the process was collected in a separate container for proper disposal. The average of three fluorescence readings was used to calculate chlorophyll a concentrations and all measurements were recorded along with corresponding latitude, longitude, and time in UTC. Nutrient sampling and analysis: Nutrient samples were collected from select CTD rosettes, as well as from underway seawater samples. The AA3 segmented flow analyser was used to determine ammonia, nitrate, nitrite, phosphate and silicate concentrations. When sampling for nutrients, vinyl gloves were worn to limit risk of contamination of samples. CTD nutrient samples were collected in Sarstedt Australia 10 mL polypropylene (PP) tubes with high density polyethylene (HDPE) screw caps (part number: 60.9921.819) (Rees et al 2019). Underway seawater samples were collected in scintillation vials. Sampling vials were rinsed three times prior to sample collection. After collection, samples were allowed to come to room temperature in the dark and measured within 2 hours to reduce any biological activity within the samples (Rees et al 2019). If analysis could not be completed within 2 hours, they were stored in the dark at 4°C and analyzed within 12 h. References: Rees, C, & Pender, L, Sherrin, K, Schwanger, C, Hughes, P, Tibben, S, Marouchos, A, Rayner, M, 2018, Methods for reproducible shipboard SFA nutrient measurement using RMNS and automated data processing. Limnology and Oceanography: Methods. 17. 10.1002/lom3.10294. Turner Designs, 2023, Application Note: Non-Acidification Technique for Extracted Chlorophyll a Analysis. Viewed 22 April 2024 http://docs.turnerdesigns.com/t2/doc/appnotes/S-0013.pdf
Hierarchy level
Dataset
Hierarchy level
Dataset

Platform

Identifier

Code
Investigator

Instrument

Identifier

Code
Sea-Bird SBE 911plus CTD

Instrument

Identifier

Code
Sea-Bird SBE 911plus CTD

Instrument

Identifier

Code
ITS-90

Instrument

Identifier

Code
Sea-Bird SBE 911plus CTD

Instrument

Identifier

Code
Sea-Bird SBE 43 Dissolved Oxygen sensor

Instrument

Identifier

Code
Sea-Bird SBE 911plus CTD

Instrument

Identifier

Code
Sea-Bird SBE 911plus CTD

Instrument

Identifier

Code
Sea-Bird SBE 911plus CTD

Instrument

Identifier

Code
WET Labs ECO-AFL/FL

Instrument

Identifier

Code
WETLabs ECO BB9 backscattering sensor

Instrument

Identifier

Code
LI-COR LI-190 PAR sensor

Instrument

Identifier

Code
WET Labs CDOM

Instrument

Identifier

Code
Sea-Bird SBE 911plus CTD

Metadata

Metadata identifier
urn:uuid/df4cd452-6ad9-4784-b0a5-809f03ef94ba

Language
English
Character encoding
UTF8

Distributor

IMAS Data Manager - Data Officer
Institute for Marine and Antarctic Studies
Private Bag 129
Hobart
Tasmania
7001
Australia
Institute for Marine and Antarctic Studies (IMAS) website >

Type of resource

Resource scope
Dataset
Name
IMAS Dataset level record
Metadata linkage
https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/df4cd452-6ad9-4784-b0a5-809f03ef94ba

Point of truth URL of this metadata record

Date info (Creation)
2024-04-15T00:00:00
Date info (Revision)
2025-06-05T08:12:31

Metadata standard

Title
ISO 19115-3:2018
 
 

Overviews

Spatial extent

N
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W


N
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E
W


N
S
E
W


N
S
E
W


N
S
E
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N
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E
W


N
S
E
W


N
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W


Keywords

CTD PAR UNDERWAY
Australian and New Zealand Standard Research Classification (ANZSRC): Fields of Research
Biological Oceanography Chemical Oceanography Marine and Estuarine Ecology (incl. Marine Ichthyology) Physical Oceanography
Global Change Master Directory Earth Science Keywords, Version 8.5
AMMONIA CHLOROPHYLL CONDUCTIVITY FLUORESCENCE NITRATE NITRITE NUTRIENTS OCEAN PRESSURE OCEAN TEMPERATURE OXYGEN PHOSPHATE TURBIDITY

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