Task: Instance Description Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes the instance 'ekman'?

A. the instance climate classification, also known as the hot low-latitude steppe, is characterized by having mean annual temperatures greater than 18 degree C.
B. the instance climate classification is characterized by having year-round precipitation and having 1 - 4 months above 10 degree C.
C. Motions describing an equlibrium between pressure gradient force, Coriolis force and the turbulent drag force.
D. A system or flow that evolves slowly in time compared to the rotation period of the earth, has a length scale of the deformation radius or larger, and undergoes only limited vertical excursions.

Answer: Motions describing an equlibrium between pressure gradient force, Coriolis force and the turbulent drag force.