Information about the Riser Data

General Information

• Most of the floats were deployed as part of the ACCE and so measured only temperature and pressure. There were a few APEX floats.
• Both temperatures and pressures were calculated from the "counts" that were sent ashore from the float.
• The APEX floats have active buoyancy controls to attempt to keep the ascent rate to about 8 cm/s. The R1 floats have no active buoyancy controls and so the ascent rate is faster, measured to be 15 cm/s. Descent rates for both types are not controlled.
• Information about the float is available in the pcode variables. These include the following. (See the codes list in the documents section.)
  CSC1 - the name of the originator of the data
  PBV$ - battery voltages
  PSP$ - pressure at the surface
  DDB$ - deployment date
  DLT$ - deployment latitude
  DLO$ - deployment longitude
  PIV$ - internal vacuum recorded
  PRK$ - intended parking depth
  PBS$ - piston position
  PP2$ - piston position at the surface
  WMO$ - WMO number
  CNV$ - controller board
  IST$ - the type of float (R1 or APEX). R1 measure T and p only. APEX use a Seabird SBE41 sensor for measuring salinity