tendency_of_eastward_wind
https://w3id.org/hacid/data/cs/variables/cf/tendency_of_eastward_wind <https://w3id.org/hacid/onto/data/Variable>
"tendency_of_X" means derivative of X with respect to time. "Eastward" indicates a vector component which is positive when directed eastward (negative westward). Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.)
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tendency_of_eastward_wind