[ncl-talk] dim_spei_n documentation (standardized precipitation evapo-transporation index)

[Dennis Shea]

[1] There has never been a  *dim_spei_n*  function. Only  *dim_spi_n*
<http://www.ncl.ucar.edu/Document/Functions/Built-in/dim_spi_n.shtml>
Please read the documentation examples. More *SPI *examples are *here*
<http://www.ncl.ucar.edu/Applications/spi.shtml>

[2] The *NCL Applications* <http://www.ncl.ucar.edu/Applications/> page has
an entire category for evapotranspiration:

*Crop: Evapotranspiration; Penman-Monteith (FAO-56); Thornthwaite
<http://www.ncl.ucar.edu/Applications/crop.shtml>*

[3] From the NCL home page, click *Functions*; click *Category*; Click
*Crop.*
There is a suite of functions that have a  *refevt_ *preface. This suite
includes: *refevt_hargreaves_fao56*
<http://www.ncl.ucar.edu/Document/Functions/Crop/refevt_hargreaves_fao56.shtml>

[4] I strongly suggest that you read *FAO-56*
<http://www.fao.org/3/x0490e/x0490e07.htm>

*===*
Please see: the *NCL_User_Guide *
<http://www.ncl.ucar.edu/Document/Manuals/NCL_User_Guide/>to learn NCL


Good luck

On Mon, Mar 11, 2019 at 11:47 AM Oluwaseun Ilori <wilseun at gmail.com> wrote:

> Hello community,
> I've been doing some works on drought over some time now and I need to
> compute SPEI with ncl using the "dim_spei_n" function reference card. I've
> been also looking for documentation and usage of this function but I have
> no luck about that (maybe I didn't search very well). until I came across
> this (http://mailman.ucar.edu/pipermail/ncl-talk/2016-February/005133.html)
> process which is not clear to to me cos I guessed the writer make use of
> thornthwaite method to compute evapo-transpiration (require on mean
> temperature). Practicing with the examples on the page takes me to no
> where. My questions are;
> 1. is this dim_spei_n still available in NCL latest version and the link
> to it.
> 2. if not, how could compute evapo-transpiration (ET) in NCL using
> Hargreaves method that takes in minimum and maximum temperature as input
> data and latiude so that I can further subtract the result from my
> prcipitation data since SPEI is also know as the difference between
> Precipitation and ET.
> 3. i want to save the result in netcdf file.
> NB: 1 and 2 is my major problem that has kept me on a spot for over three
> months now.
> Thanks for the helpful response in advance.
>
> --
> *OLUWASEUN ILORI*
> *B.Tech(Hons) in Meteorology*
>
> *M.Tech in Meteorology and climate science (in view)*
>
> *Phone: +2347031000687 +2348069154213*
> *Federal University of Technology Akure. Nigeria.*
> *Facebook: *http://facebook.com/hilorywilson
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