[ncl-talk] How to pick only the lowest level in dim_ave_nwrap

[Jacob Alberto Garcia]

Hello I'm having trouble doing a timeaverage of pm2.5 since it has 4
dimensions (time,e_we, s_sn, bot_top)

this is my code:
--------------------------------------------------------------------------------------------



load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
;load "./WRFUserARW.ncl"


  diri = "./"
  jake = (/ "d03_JUN_P_11_YSU.nc", "d03_JUL_P_15_YSU.nc",
"d03_AUG_P_15_YSU.nc", "d03_AUG_P_16_YSU.nc"/)
  pthi = diri+jake
   j = addfile("d03_DEC_MYJ_F.nc", "r")
fa  = addfiles(pthi, "r")
pm25 = fa[:]->PM2_5_DRY
pm25_avg = dim_avg_n_Wrap(t2a, 0)
printVarSummary(pm25_avg)   ; south_north | ??] x [west_east | ??]




; We generate plots, but what kind do we prefer?
  type = "pdf"
; type = "pdf"
; type = "ps"
; type = "ncgm"

wks = gsn_open_wks(type,"avepm_d03")



  gsn_define_colormap(wks, "BlWhRe")




  pltres = True
  mpres = True
  res = True
  mpres at mpDataBaseVersion = "HighRes"
  res at MainTitle                   = "2 meter temperature Difference"
  mpres at mpGridAndLimbOn = False
  res at gsnMaximize = True
  res at cnFillOn = True
  res at gsnSpreadColors = True
  res at cnLevelSelectionMode = "ManualLevels"
  res at cnMinLevelValF  = -1.8            ; set the minimum contour level
  res at cnMaxLevelValF  = 2.            ; set the maximum contour level
  res at cnLevelSpacingF = 0.1
  res at cnLinesOn = False
  res at cnLineLabelsOn = False
  mpres at mpGeophysicalLineColor = "Black"




plot    = gsn_csm_contour_map(wks,pm25_avg,res)

     contour_ave = wrf_contour(j,wks,pm25_avg,res)

     plot = wrf_map_overlays(j,wks,(/contour_ave/),pltres,mpres)






--------------------------------------------------------------------------------------------------------

pm25 = fa[:]->PM2_5_DRY
pm25_avg = dim_avg_n_Wrap(t2a, 0)

maybe in these two lines i need to change something to just let it get thhe
lowest level? I cannot find out how. Hoping for any help at all.

Cheers,
Jacob

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