8th bimonthly progress report

The approach used so far, is to estimate the ocean surface current by subtracting the wind-doppler from the total observed Doppler velocity. The wind-doppler is then calculated from the CDOP model, by imposing the wind vectors from a numerical forecast model (NCEP GFS).

However, whereas the model wind is relative to a fixed earth, it should be more correct to use the wind speed relative to the moving ocean surface (current).

The following approach will here be tested:

1. A first order current is obtained by subtracting from the total Doppler surface velocity the wind-doppler obtained using CDOP and model wind.
2. An updated wind field is then calculated, relative to the first order current.
3. A new wind-doppler is calculated from the updated (relative) wind field
4. This updated wind-doppler is subtracted from the total Doppler surface velocity, to yield a second order current.