Editing Cromwell Current (section)

==Mechanism==
It is difficult to explain the Cromwell Current easily. At least two different mechanisms are at work in order to guarantee the constant eastward current: (a) Because the Cromwell Current is located on the equator, the [[Coriolis force]] is equal to zero and does not act upon a water parcel. This means that the east–west [[pressure gradient]] functions without being diverted from the high-pressure area in the west toward the low-pressure area in the east, simply following the gradient. The cause of the pressure gradient is at least partially the [[trade winds]] blowing from the east westward. (b) Any water parcel flowing eastward from the west that would somehow be perturbed from its path would be diverted northward if north of the equator and southward if south of the equator. In such a case the local Coriolis force would force the parcel immediately back into the main current that flows from west to east.<ref>{{Cite book|title=Introduction to physical oceanography|last=Knauss|first=John A.|publisher=Waveland Press|year=1997|isbn=9781577664291|pages=148–151}}</ref>