Surface currents from AVHRR image sequences
The vectors plotted above show surface velocity computed from AVHRR imagery by the method of Maximum Cross Correlations for a 2-day period centered on May 18, 2006.
The MCC surface velocities show strong flow of warm water into the big warm core ring due south of
The MCC method objectively tracks the displacement of small scale anomalies in sequential infrared imagery, and composites these after a series of consistency and significance checks (Bowen et al., 2002). Here we use all possible AVHRR channel-4 image pairs separated by 3 to 13 hours. Where vectors are absent there were insufficient clear image pairs or statistically significant displacement estimates to derive a useful current vector. These results were computed from imagery acquired by the HRPT receiver at IMCS,
Bowen, M., W. J. Emery, J. Wilkin, P. Tildesley, I. Barton and R. Knewtson (2002), Extracting multi-year surface currents from sequential thermal imagery using the Maximum Cross Correlation technique, Journal of Atmospheric and Oceanic Technology, 19, 1665-1676.