Platforms at sea. The SSS measurements originate from the Ship Of Opportunity Programs (SOOP) operated from Brest, France, and Nouméa, New Caledonia. Additional data are obtained from French research vessels, including the Alis and the Astrolabe. On average, each selected ship provides one to three sections per season along a regular track.
|Mean Sea Surface Temperature. Overplotted as heavy blue lines are a schematic of the shipping routes equiped with thermosalinograph instruments (in the past and presently). Click here for more details.|
Instruments. The SSS measurements are mainly based on SeaBird SBE-21 ThermoSalinoGraph (TSG) instruments fitted with bubble traps, the whole system being located as close as possible to the ship's engine water intake. Detailed information about the TSG installation and maintenance is available in a dedicated report.
|TSG with bubble trap water jackets.|
Data Acquisition and Transmission. Most of the TSG measurements are collected every 15 s, and a median filter over 5 mn is applied to reduce small scale signal and/or noise. The 5 mn resolution data are recorded in memory, and processed at laboratories : these are the Delayed Mode Data. For some ships, reduced data are transmitted by Inmarsat C or Iridium satellite system : these are the Real Time Data. Details by ships are given here.