Data Trawler - Project details

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Project details

Title: Estimates of silica production within mixed phytoplankton communities along a latitudinal gradient of Eastern Australia.
Id: 2588

Katherina Petrou
University of Technology, Sydney [details]

Description: The primary goal of this project is to obtain community and species-specific estimates of silica production within mixed natural phytoplankton communities along a latitudinal gradient of Eastern Australia. Therefore, there are two specific aims of this project: 1) To determine bulk rates of silicification in phytoplankton communities from latitudinally distinct bioregions (SOTS providing a southern-most site). 2) To evaluate species-specific silicification to identify the heavy weights within the community. With this information in hand we can start to build a more complete picture of silicon cycling in regionally distinct oceanographic waters of Australia. Water sampling: We will collect 10L seawater from chl max and 10L from surface from one of the CTD casts at each of the two SOTS sites. If a DCM (deep chl max) is detected, we would like to also to sample 10L from that depth. CTD sampling will be done via silicon tubing into a carboy. Sampling can be done after hydrochemistry sampling is completed.
Years: 2021

List of surveys that this project was on.

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Survey InvestigatorDescription

Dr Shadwick (ACE CRC) The Southern Ocean has a predominant role in the movement of heat and carbon dioxide into the ocean interior moderating Earth’s average surface climate. The IMOS SOTS sub-facility uses a set of two automated moorings to measure these processes under extreme conditions, where they are most intense and have been least studied. The atmosphere-ocean exchanges occur on many timescales, from daily insolation cycles to ocean basin decadal oscillations and thus high frequency observations sustained over many years are required. The current context of anthropogenic forcing of rapid climate change adds urgency to the work. The primary objective is to first deploy a new set of SOTS moorings (SOFS-9 and SAZ-22) and then recover the existing SOTS moorings (SOFS-8 and SAZ-21). Each of the SOTS moorings delivers to specific aspects of the atmosphere-ocean exchanges: • 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) mooring measures meteorological and ocean properties important to air-sea exchanges, ocean stratification, waves, currents and biological productivity and ecosystem structure. Water samples are collected for more detailed nutrient and plankton investigations after recovery. Ancillary work will obtain supporting information on atmospheric and oceanographic conditions using CTD casts, underway measurements, Triaxus towed body, Continuous Plankton Recorder and autonomous profiling Biogeochemical-Argo floats, and potentially casts of a bio-optical sensor package.
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