[ncl-talk] Help with netcdf output
Melanie O' hanoly
mel.hanoly at gmail.com
Tue Sep 19 08:00:09 MDT 2017
Hello Ncl Users
I'm trying to extract a variabcle from my routine from ncl to netcdf file.
The routine calculates the EOF of climate index and then does the
regression with another variable of my interest and I would like to extract
to nc this result of regression (The routine is below).
I know that "n" is the number of EOF components, how can I extract only the
first?
I'm tryng to use this but the final result is only the first eof Component
and not the result of regression..
";=== output to netcdf file =====
newfile = "output-EOF.nc"
system("rm -f "+newfile)
file_create = addfile(newfile, "c") ;creating file
file_create->eof_regres = x
EOF ROUTINE
;==============================================================
; eof_4.ncl
;==============================================================
; Match the AAO pattern at:
; http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/aao/aao.loading.shtml
;
; Use method:
; http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/aao/aao.shtml
;==============================================================
; Data source was Reanalysis-2 geopotential height.
; http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis2.pressure.html
;==============================================================
; NCL V6.4.0 has new functions eofunc_n_Wrap and eofunc_ts_n_Wrap
; that allow you to calculate the EOFs without first having to
; first reorder the data. See eof_4_640.ncl.
;==============================================================
; These files are loaded by default in NCL V6.2.0 and newer
; load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
; load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
; load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
; ==============================================================
; User defined parameters that specify region of globe and
; ==============================================================
latS = -90.
latN = -20.
plev = 700
yrStrt = 1979
yrLast = 2000
var = "hgt"
title = str_upper(var)+": "+plev+"hPa "
ymStrt = yrStrt*100 + 1
ymLast = yrLast*100 + 12
neof = 1 ; Leading EOF only
optEOF = True
optETS = False
; ==============================================================
; Open the file: Read only the user specified period and level
; ==============================================================
f = addfile ("./hgt.mon.mean.nc", "r")
TIME = f->time
YYYY = cd_calendar(TIME,-1)/100 ; entire file
iYYYY = ind(YYYY.ge.yrStrt .and. YYYY.le.yrLast)
x = short2flt( f->$var$(iYYYY,{plev},{latS:latN},:) )
printVarSummary(x) ; (time, lat,lon)
; ==============================================================
; compute climatology and Anomalies
; ==============================================================
xClm = clmMonTLL(x) ; (12,lat,lon)
printVarSummary(xClm)
xAnom = calcMonAnomTLL ( x, xClm) ; (time, lat,lon)
printVarSummary(xAnom)
printMinMax(xAnom, True)
; =================================================================
; create weights: sqrt(cos(lat)) [or sqrt(gw) ]
; =================================================================
rad = 4.*atan(1.)/180.
clat = xAnom&lat
clat = sqrt( cos(rad*clat) ) ; gw for gaussian grid
printVarSummary(clat)
; =================================================================
; weight all observations
; =================================================================
xw = xAnom*conform(xAnom, clat, 1)
copy_VarMeta(x, xw)
xw at long_name = "Wgt: "+x at long_name
; =================================================================
; Reorder (lat,lon,time) the *weighted* input data
; Compute EOFs & Standardize time series
; =================================================================
wx = xw(lat|:,lon|:,time|:) ; convenience, cleaner code
delete(xw)
eof = eofunc_Wrap(wx, neof, optEOF)
eof = -1*eof ; *special* match sign of CPC
eof_ts = eofunc_ts_Wrap (wx, eof, optETS)
printVarSummary( eof ) ; examine EOF variables
printVarSummary( eof_ts )
eof_ts = dim_standardize_n( eof_ts, 0, 1) ; normalize
; =================================================================
; Regress
; =================================================================
eof_regres = eof ; create an array w meta data
do ne=0,neof-1
eof_regres(ne,:,:) = (/ regCoef(eof_ts(ne,:), xAnom(lat|:,lon|:,time|:)) /)
end do
; =================================================================
; Extract the YYYYMM from the time coordinate
; associated with eof_ts [same as x&time]
; =================================================================
yyyymm = cd_calendar(eof_ts&time,-1)
yrfrac = yyyymm_to_yyyyfrac(yyyymm, 0.0); not used here
;============================================================
; PLOTS
;============================================================
wks = gsn_open_wks("png","eof") ; send graphics to PNG file
plot = new(neof,graphic) ; create graphic array
; only needed if paneling
; EOF patterns
res = True
res at gsnDraw = False ; don't draw yet
res at gsnFrame = False ; don't advance frame yet
res at gsnPolar = "SH"
res at mpFillOn = False ; turn off map fill
res at mpMaxLatF = latN
res at mpCenterLonF = 180
res at cnFillOn = True ; turn on color fill
res at cnFillPalette = "BlueWhiteOrangeRed"
res at cnLinesOn = False ; True is default
res at cnLineLabelsOn = False ; True is default
res at lbLabelBarOn = False ; turn off individual lb's
; set symmetric plot min/max
symMinMaxPlt(eof_regres, 16, False, res) ; contributed.ncl
res at cnLevelSpacingF = 5.0 ; *special* match CPC
; panel plot only resources
resP = True ; modify the panel plot
resP at gsnMaximize = True ; large format
resP at gsnPanelLabelBar = True ; add common colorbar
resP at gsnPaperOrientation = "portrait" ; force portrait
resP at txString = title+": "+yrStrt+"-"+yrLast
;*******************************************
; first plot
;*******************************************
do n=0,neof-1
res at gsnLeftString = "EOF "+(n+1)
res at gsnRightString = sprintf("%5.1f", eof at pcvar(n)) +"%"
plot(n)=gsn_csm_contour_map_polar(wks,eof_regres(n,:,:),res)
end do
gsn_panel(wks,plot,(/neof,1/),resP) ; now draw as one plot
;*******************************************
; second plot
;*******************************************
; EOF time series [bar form]
rts = True
rts at gsnDraw = False ; don't draw yet
rts at gsnFrame = False ; don't advance frame yet
rts at gsnScale = True ; force text scaling
; these four rtsources allow the user to stretch the plot size, and
; decide exactly where on the page to draw it.
rts at vpHeightF = 0.40 ; Changes the aspect ratio
rts at vpWidthF = 0.85
rts at vpXF = 0.10 ; change start locations
rts at vpYF = 0.75 ; the plot
rts at tiYAxisString = "Standardized" ; y-axis label
rts at gsnYRefLine = 0. ; reference line
rts at gsnXYBarChart = True ; create bar chart
rts at gsnAboveYRefLineColor = "red" ; above ref line fill red
rts at gsnBelowYRefLineColor = "blue" ; below ref line fill blue
; panel plot only resources
rtsP = True ; modify the panel plot
rtsP at gsnMaximize = True ; large format
rtsP at txString = title+": "+yrStrt+"-"+yrLast
; create individual plots
do n=0,neof-1
rts at gsnLeftString = "EOF "+(n+1)
rts at gsnRightString = sprintf("%5.1f", eof_regres at pcvar(n)) +"%"
plot(n) = gsn_csm_xy (wks,yrfrac,eof_ts(n,:),rts)
end do
gsn_panel(wks,plot,(/neof,1/),rtsP) ; now draw as one plot
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