. "\"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." . "downward northward stress at sea ice base" . . . . "Climate and Forecast (CF)" .