Sediment traps (IMOS platform code:SAZOTS) are cones which intercept and store falling marine particles in collection cups. The particles consist of a range of material including phytoplankton, zooplankton, faecal pellets, and dust. Each trap collects a time series of samples. The sediment traps are from deep moorings in the Southern Ocean, typically at 47S, but also including 54S, and 61S and at around 140 degrees East. Each mooring typically has 2-3 traps between 800m and 3800m below sea-level.
The samples are size fractionated into <1mm and >1mm fractions using a 1mm sieve. Various chemical analyses and observations have been made on the <1mm fraction. Analysis methods are described in the attached document "SAZ PROJECT MOORED SEDIMENT TRAPS: RESULTS OF THE 1997-1998 DEPLOYMENTS", and in more detail in the SOTS annual reports (https://catalogue-imos.aodn.org.au:443/geonetwork/srv/api/records/afc166ce-6b34-44d9-b64c-8bb10fd43a07).
Photographs of the >1mm fraction from the 47S deployments are available here for download, starting from 1998. After processing, data from IMOS deployments will be made available.
Data from 47S deployments, starting in 1997, have been quality controlled and are available through the AODN Portal.
Preliminary sediment trap data are indicative only and have not been quality controlled. Analysis of the samples is ongoing. A full dataset for this sediment trap deployment will be made available through the IMOS Ocean Portal when analysis is complete.
The photograph file name format follows, using a typical example.
1) s02: s is for SAZ. Collection season number is first year of collection season. So s02 is from SAZ 2002-2003.
2) 54: Nominal latitude, South
3) 800: Nominal depth, m.
4) 04: Cup number, typically 1-21 or 1-13, single digit numbers padded with a zero to help operating systems display files in order.
5) .jpg: All photos are in jpeg format
Some file names have additional information appended, examples below:
* FP: faecal pellet
* begin and end: beginning and end of sieving process. Mostly to show faecal pellets at start that are rinsed through sieve.
* a,b: Mostly for large samples when several sieves were used. Occasionally used with different lighting conditions.
* bug: swimmer, often picked.
Australia’s Integrated Marine Observing System (IMOS) is enabled by the National Collaborative Research Infrastructure Strategy (NCRIS). It is operated by a consortium of institutions as an unincorporated joint venture, with the University of Tasmania as Lead Agent.
Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC)
Australian Antarctic Division (AAD)