Data Trawler - Project details

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Project details

Title: International Nutrient Intercalibration Exercise
Id: 2510
Investigator(s): Mark Rayner
CSIRO Oceans & Atmosphere - Hobart [details]

Description: This project will centre on the investigation of seawater nutrient analysis, specifically looking at the differences in results obtained by a series of international groups. The analysis of seawater nutrients is completed all over the world, conducted with many different instruments and methodologies. This voyage will assist in the furthering of knowledge on the analysis as well as allowing different groups to highlight differences between attained results. With close collaboration between potentially 5 scientific parties, the science of seawater nutrient analysis can be improved or refined upon. Many aspects of this analysis will be studied, spanning from the collection of water to the final data processing. This international collaboration is beneficial for all involved, allowing all teams to advance their analysis techniques. The impact of this voyage will be the improved knowledge of nutrient analysis techniques, potentially meaning future data will be of higher accuracy and precision, lowering the uncertainty associated with analysis of samples.
Years: 2017



List of surveys that this project was on.

Use [details] link to view survey details (map, reports, metadata etc) including links to download data.

Survey InvestigatorDescription

Thomas W Trull (CSIRO/ACE CRC) Eric Schulz (BOM) The Southern Ocean Time Series provides world-leading automated observations from deep-ocean moorings of the exchanges of heat, water, carbon dioxide, and oxygen between the ocean and atmosphere, and the physical and biological processes that control them. These results contribute to forward projections of anthropogenic climate warming, inform the setting of emissions targets, illuminate controls on climate variability, and provide a baseline for impacts on ocean pelagic ecology. Sensor data is returned live to the internet and samples are returned annually for further study in shore laboratories. The primary objective is to first deploy a new set of SOTS moorings (SAZ-19 and SOFS-6) and then recover the existing SOTS moorings (FluxPulse-1 lower section, and SAZ-18). Additional work will obtain ancillary information on atmospheric and oceanographic conditions using CTD casts, underway measurements, the Triaxus towed body, and autonomous profiling "Bio-Argo" floats. Each of the SOTS moorings delivers to specific aspects of the atmosphere-ocean exchanges, with some redundancy: * the SAZ sediment trap mooring collects samples to quantify the transfer of carbon and other nutrients to the ocean interior by sinking particles, and investigate their ecological controls. * the Southern Ocean Flux Station (SOFS) measures meteorological properties and ocean properties important to air-sea exchanges, ocean stratification, waves, and currents. * the (now superceded) Pulse biogeochemistry mooring focused on processes important to biological CO2 consumption, including net community production from oxygen measurements and nitrate depletion, biomass concentrations from bio-optics and bio-acoustics, and collection of water samples for nutrient and plankton quantification. * the FluxPulse mooring combines some elements of Pulse onto the SOFS platform to create a combined mooring, and was deployed for the first time in 2016, but broke into two sections. The top section has been recovered. The bottom section remains to be recovered. This combined mooring was intended to meet financial constraints. In 2017 we will use the simpler SOFS design, while redesigning FluxPulse for relaunch in 2018. Piggyback projects: * International Nutrient Intercalibration Exercise * Spatial and Temporal Variability in the Distribution and Abundance of Seabirds * Trace Element Cycling * Acoustic estimates of zooplankton and fish distributions
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