" \"y\" indicates a vector component along the grid y-axis, when this is not true latitude, positive with increasing y. \"Downward\" indicates a vector component which is positive when directed downward (negative upward). The surface called \"surface\" means the lower boundary of the atmosphere. A downward y stress is a downward flux of momentum towards the positive direction of the model's y-axis." . . . "Climate and Forecast (CF)" . . . "surface downward y stress correction" .