[ncl-talk] calcMonAnomTLL
Setareh Rahimi
setareh.rahimi at gmail.com
Thu May 27 01:23:59 MDT 2021
Dear all NCL users,
I visited this link:
https://www.ncl.ucar.edu/Document/Functions/Contributed/calcMonAnomTLL.shtml ,
which is about monthly anomalies. But I could not understand the way it
calculates the anomalies.
_____________________________________________________________________________________________
Example 1
fa = *addfile*
<https://www.ncl.ucar.edu/Document/Functions/Built-in/addfile.shtml>("air.mean.nc","r")
fb = *addfile*
<https://www.ncl.ucar.edu/Document/Functions/Built-in/addfile.shtml>("air.nobs.nc","r")
air = *short2flt*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/short2flt.shtml>(
fa->air) ; air temp
nobs = *short2flt*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/short2flt.shtml>(
fb->air) ; # obs for air
; filter out geographic locations that have < nMin observations
nMin = 2 ; min # obs
air = *mask*
<https://www.ncl.ucar.edu/Document/Functions/Built-in/mask.shtml>(air,nobs.ge.nMin,True)
;---Compute the climatology using a function in contributed.ncl
yrStrt = 1950
yrLast = 1979
moStrt = (yrStrt-1800)*12 ; start subscript
moLast = (yrLast-1800)*12 + 11 ; last subscript
clm = *clmMonTLL*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/clmMonTLL.shtml>
(air(moStrt:moLast,:,:)) ; monthly climatology
;---Compute the anomalies from the climatology just computed
xAnom = *calcMonAnomTLL* (air,clm)
_________________________________________________________________
May I ask you please explain subscript method? Why using 1800 and then
multiply 12?
what do moStrt and moLast show?
I appriciate any advse
All the best,
--
S.Rahimi
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