Satellite Relay Tagging Program - Southern Ocean - MEOP Quality Controlled CTD Profiles

• Other Authors: AODN Data Manager (distributor), Data Officer (distributor), Department of Meteorology, Stockholm University (MISU) (hasAssociationWith), Hindell, Mark (hasPrincipalInvestigator), Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) (hasAssociationWith), Integrated Marine Observing System (IMOS) (resourceProvider), McMahon, Clive (pointOfContact), Roquet, Fabien (processor), Sydney Institute of Marine Science (SIMS) (hasAssociationWith)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: oceans; WATER TEMPERATURE; EARTH SCIENCE; OCEAN TEMPERATURE; CONDUCTIVITY; SALINITY/DENSITY; Oceans | Marine Biology | Marine Mammals; CTD Satellite Relay Data Logger; Agency | SMRU | Sea Mammal Research Unit; Tags and Tracking Devices; Global / Oceans | Southern Ocean; Global / Oceans | Indian Ocean; Continents | Antarctica; Countries | Australia; Offshore Islands (Australia) | Heard & McDonald Islands; Offshore Islands (Australia) | Macquarie Island; States; Territories (Australia) | Tasmania; land-sea mammals; Temperature of the water body; Practical salinity of the water body; Pressure (measured variable) in the water body exerted by overlying sea water and any medium above it; Latitude north; Longitude east; CTD; Animal Tagging Sub-Facility; Integrated Marine Observing System (IMOS); Heard; Indian; McDonald Islands; Southern Ocean; Antarc*; Antarctica; Macquarie Island
• Online Access: https://researchdata.edu.au/satellite-relay-tagging-ctd-profiles/954724

Maintenance and Update Frequency: asNeeded Statement: The CTD?Satellite Relay Data Loggers (CTD-SRDLs) are built by the Sea Mammal Research Unit (SMRU, University of St. Andrews, UK), incorporating CTD sensors developed by Valeport Ltd (Devon, UK). The sensor head consists of a pressure transducer, a platinum resistance thermometer, and an inductive cell for measuring conductivity. The temperature and conductivity sensors have a precision (repeatability) of 0.005�C and 0.005 mS/cm, respectively. Before being taken into the field, devices are calibrated in the laboratory by Valeport. Some of the CTD-SRDLs (about half) were also tested at sea against a ship-based CTD before the deployment. CTD-SRDLs record hydrographic profiles during the ascent of seals, retaining only the deepest dive in each six-hour time interval, and transmitting profiles in a compressed form (between 10 and 25 data points per profile, depending on the tag program) through the Advanced Research and Global Observation Satellite (ARGOS) system. The accuracy of ARGOS geo-positioning is typically better than �5 km, because seals never stay at the surface more than a few minutes. New methods are currently under development by the ARGOS team, which should substantially improve the quality of positioning. Hydrographic profiles are post-processed using a unified procedure of editing, adjustment, and validation (Roquet, F. et al. Delayed-mode calibration of hydrographic data obtained from animal-borne satellite relay data loggers. J. Atmos. Ocean. Technol. 41, 787?801 (2011)). Each individual CTD-SRDL dataset is post-processed separately, as each tag has different technical specifications and a different life history. A standard set of tests, adapted from Argo standard quality-control procedures (Wong, A. et al. Argo Quality Control Manual v2.9. Argo Data Management, 54pp, http://www.argodatamgt.org (2013)), is first run to remove bad profiles, spikes, and outliers. For CTD-SRDLs with profiles in frozen areas, a temperature offset was estimated ...