The sea surface temperature (SST) applied as boundary condition in the WRF simulations are the real-time-global (rtg) data on horizontal resolution of 0.083x°0.083° (http://polar.ncep.noaa.gov). The SST reprojected on the model Ε-grid on a horizontal resolution of 0.09°x0.09°.
Gemmill, William, Bert Katz and Xu Li, 2007: Daily Real-Time Global Sea Surface Temperature - High Resolution Analysis at NOAA/NCEP. NOAA / NWS / NCEP / MMAB Office Note Nr. 260, 39 pp.