[ncl-talk] Question on moisture advection example

[Lyndz]

Dear NCL-experts,

I just want to clarify the following:

I am calculating moisture advection from this example:
https://www.ncl.ucar.edu/Document/Functions/Contributed/advect_variable.shtml

Problems:
[1] I am a little confused about the sign of the given equation here.
Should the final output (advection) be multipled by -1? Not multiplying by
-1 seems to give me the correct result, but if this is the case, all the
terms should be negative in the equation:
*adv_X = -U*(dX/dlon) -V*(dX/dlat)*

[2] If I have to separate the zonal and meridional components, they should
be also multiplied by -1?

Sincerely,

Lyndz
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