"Climate and Forecast (CF)" . . . . "\"integral_of_Y_wrt_X\" means int Y dX. The data variable should have an axis for X specifying the limits of the integral as bounds. \"wrt\" means with respect to. The surface called \"surface\" means the lower boundary of the atmosphere. \"Northward\" indicates a vector component which is positive when directed northward (negative southward). \"Downward\" indicates a vector component which is positive when directed downward (negative upward). \"Downward northward\" indicates the ZY component of a tensor. A downward northward stress is a downward flux of northward momentum, which accelerates the lower medium northward and the upper medium southward. The surface downward stress is the windstress on the surface." . . "integral of surface downward northward stress wrt time" .