"tendency of eastward wind due to nonorographic gravity wave drag"@en . . "2019-01-14" . . . . "2019-01-14" . . "The specification of a physical process by the phrase due_to_process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. Eastward indicates a vector component which is positive when directed eastward (negative westward). The total tendency of the eastward wind due to gravity waves has the standard name tendency_of_eastward_wind_due_to_gravity_wave_drag. It is the sum of the tendencies due to orographic gravity waves and nonorographic waves. The tendency of eastward wind due to orographic gravity waves has the standard name tendency_of_eastward_wind_due_to_orographic_gravity_wave_drag."@en . .