IN2018_V05 biogeochemistry data

These data are from a piggy back voyage to IN2018_V05, October-November 2018. The Chief Scientists were Helen Phillips and Nathan Bindoff. Nic Pittman and Clara Vives collected biogeochemical data on the voyage, and Xiang Yang used these data in his Hons thesis 2020-2021. The purpose of the study was to investigate biogeochemical variability in the region of the Polar Front meander south of Tasmania. Data include CTD nutrients, chlorophyll and oxygen as well as underway phytoplankton physiology and pCO2. Some data are duplicated but not in exactly the same format on the CSIRO Data Trawler.

Methods are described in Yang et al published in JGR-Oceans, 2022.

The temporal coverage is from 2018-10-16 to 2018-11-16 (GMT+1100)   

Spatial coverage is: -58 -42 S and 147 -158 E,

The data format is excel files.

Data access

The data is published on the IMAS data portal

Processed CTD data - https://data.imas.utas.edu.au/attachments/25793d1d-7410-499d-b4b8-bc107f01c38c/CTD_Processed.xlsx

Variable list:

• Chlorophyll (mg m^-3)
• Phytoplankton fluorescence
• Ammonia(umol L-¹)
• Silicate (umol L-¹)
• Nitrate (umol L-¹)
• Nitrite(umol L^-1)
• Phosphate(umol L^-1)
• Oxygen saturation (%)
• hyd_ox - dissolved oxygen from CTD bottle data (umol L^-1)
• hyd_sal -  salinity from CTD bottle data (PSS78)
• Temperature (°C)

Processed underway data - https://data.imas.utas.edu.au/attachments/25793d1d-7410-499d-b4b8-bc107f01c38c/Underway_processed.xlsx

Variable list:

• Fv/Fm (1min. average) standardised fluorescence parameter to quantify the photochemical efficiency (health status) of phytoplankton
• Standard deviation of Fv/Fm
• pCO2 - Partial pressure of Carbon Dioxide (ppm)
• Phytoplankton fluorescence

This data was collected on the Marine National Facility (MNF) RV Investigator voyage IN2018_V05.

References

Yang, X., Strutton, P. G., Cyriac, A., Phillips, H. E., Pittman, N. A., & Vives, C. R. (2022). Physical drivers of biogeochemical variability in the Polar Front meander. Journal of Geophysical Research: Oceans, 127, e2021JC017863. https://doi.org/10.1029/2021JC017863