Surface positions for float 69027 in the NW Atlantic Code for ARGOS location error: 0 > 1500 m 1 between 500-1500 m 2 between 250-500 m 3 < 250 m

Position allocation for ice floats: Real time and delayed mode Real time position can be obtained through linear interpolation between the last known position and resurface position after ice season. (Rafos position can not be determined yet in an automated fashion). POSITION_QC should be set to 8 for interpolations POSITIONING_SYSTEM is ??? Table 9 does not contain Rafos. What is to be written in Prof-files if Rafos and Argos positioning are available? Do we change between profiles? Trajectory files only do contain a general variable POSITIONING_SYSTEM for each float nothing for individual cycles!! What is POSITION_ACCURACY for Rafos in reference table 5 for the trajectory file and what do we assign for the linear interpolation?

Position allocation for ice floats: Linear interpolation NEMO float (wmo 7900224) was deployed at 29.03.2008. It transmitted 6 profiles before it was trapped under the sea ice for about 240 days. Most of the ensuing under ice profiles were interim-stored by the float and transmitted after the sea ice had melted. - Regular profiles in red (dots and numbers) - iStored profiles in black (dots and numbers) - White line: subsurface float trajectory from acoustically tracked positions.

Position allocation for ice floats: Linear interpolation Trajectory of the APEX-RAFOS (WMO id.: 7900040) between 21 April 2004 and 30 May 2005. Small red dots represent the RAFOS based subsurface positions, as tracked with the ARTOA software package [http://www.whoi.edu/science/PO/rafos/]. Bold black dots depict the known surface positions and profile number. "Start" shows the deployment position of the float. The float is not equipped with iStore; hence during austral winter 2004 when surfacing was impossible, no information is available (gap between #4 and #19). The depth contours correspond to the 3500-, 4000-, and 4500-m isobaths

Position allocation for ice floats: Estimation of Rafos positions in DMQC Raw data of rafos signal processed with the Artoa3 software. The x-axis shows time in Rafos days which can be converted to a regular date. Y-axis shows time of time-of-arrival of the signal from the different sound sources. The color code describes the correlation of the arriving signal with the expected signal from (80s Sweep, 259.3 - 261.8 Hz) the sound sources. (orange is bad correlation, red is good correlation). This example is one of the better and clearer ones, at larger distances or with bad amplification it can look just like white noise. The white dots are positions (times) calculated from the surface time of the float and the availabe ARGOS postions. The red labels at the y-axis identify the expected arrival times for each of the sound sources in the Weddell Gyre, they are not necessariyl distinct.

Position allocation for ice floats: Estimation of Rafos positions in DMQC Color code for sound sources