[ncl-talk] a question on the NCL function gradsf

[Hui Ding]

Dear Sir or Madam,
I note that the function gradsf can calculate gradients along longitude and
latitude. I wonder about the sign of the gradient. For example, as to
*igradsf*
<https://www.ncl.ucar.edu/Document/Functions/Built-in/igradsf.shtml>
(T_grad_lon, T_grad_lat, T),  does T_grad_lon equals d(T)/dlon or -1*d(T)/dlon?
The same question for T_grad_lat.
Thank you!
Best regards,
Hui Ding
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