Sorry for the delay.. from our ancillary expert:
The GRIB 2 format meteorological datasets supply ancillary data for the ocean color processing and is the product of the Global Dataset Assimilation System (GDAS) at the National Center for Environmental Prediction (NCEP). We pick the required fields from it: wind (at 10 m agl, u, v components), sea level pressure, precipitable water and relative humidity.
References
Web site:
http://www.emc.ncep.noaa.gov/gmb/gdas/index.htmlDerber, J.C., D.F. Parrish, and S.J. Lord, 1991: The new global operational analysis system at the National Meteorological Center, Weather and Forecasting, 6, 538-547.