an Entity references as follows:
"y" indicates a vector component along the grid y-axis, when this is not true latitude, positive with increasing y. Transport by bolus advection in an ocean model means the part due to a scheme representing eddy-induced effects not included inthe velocity field. 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.