SST anomaly persistence in North Pacific from winter to summer

Analysis of observation data and CCM3-ML coupled model results reveal a local mode of ocean-atmosphere interaction in North Pacific in addition to ENSO forcing effect. A horseshoe Sea Surface Temperature (SST) anomaly persists from winter to summer. This anomaly appears to be related to the Wind-Evaporation -SST feedback, a mechanism that was previously found important mostly in Tropical. Sea Surface Wind (SSW) anomaly shows opposite direction versus the climate background SSW for most of the warm SST anomaly area. Conversely, the SSW anomaly mostly followed the direction of the climate background SSW for cold SST anomaly. This effect slows down the damping of SST anomaly and is a strong evidence of the importance of Wind-Evaporation-SST feedback in ocean-atmosphere interaction on middle latitude.