如果用WRF输出数据绘制台风路径，得到下图
********************************************************
; Plot storm stracks from wrfout files.
;********************************************************
; ===========================================
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRF_contributed.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
begin
; DATES
date = (/1512,1600,1612,1700,1712,1800,1812,1900/)
ndate = dimsizes(date)
sdate = sprinti("%4.0i",date)
; Experiment name (for legend)
EXP = (/"EXP_I"/) ; (/"EXP_I","EXP_II","EXP_III"/)
nexp = dimsizes(EXP)
; To get lat/lon info.
a = addfile("wrfout_d01_-07-15_00:00:00.nc","r")
lat2d = a->XLAT(0,:,:)
lon2d = a->XLONG(0,:,:)
dimll = dimsizes(lat2d)
nlat = dimll(0)
mlon = dimll(1)
; Sea Level Pressure
slp = wrf_user_getvar(a,"slp",0)
dims = dimsizes(slp)
; Array for track
time = new(ndate,string)
imin = new(ndate,integer)
jmin = new(ndate,integer)
smin = new(ndate,integer)
; =======
; ndate
; =======
fs = systemfunc("ls wrfout*00")
nfs= dimsizes(fs)
if(nfs .ne. ndate) then
print("Check input data:"+nfs+" .ne. "+ndate)
end if
do ifs=0,nfs-1
f = addfile(fs(ifs)+".nc","r")
time(ifs) = wrf_user_list_times(f)
; print(time(ifs))
slp2d = wrf_user_getvar(f,"slp",0)
; We need to convert 2-D array to 1-D array to find the minima.
slp1d = ndtooned(slp2d)
smin(ifs) = minind(slp1d)
; Convert the index for 1-D array back to the indeces for 2-D array.
minij = ind_resolve(ind(slp1d.eq.min(slp2d)),dims)
imin(ifs) = minij(0,0)
jmin(ifs) = minij(0,1)
; print(time(ifs)+" : "+min(slp2d)+" ("+imin(ifs)+","+jmin(ifs)+")")
end do
;
; Graphics section
wks=gsn_open_wks("ps","track") ; Open PS file.
gsn_define_colormap(wks,"BlGrYeOrReVi200") ; Change color map.
res = True
res@gsnDraw = False ; Turn off draw.
res@gsnFrame= False ; Turn off frame advance.
res@gsnMaximize= True ; Maximize plot in frame.
res@tiMainString = "Hurricane Isabel" ; Main title
WRF_map_c(a,res,0) ; Set up map resources
; (plot options)
plot = gsn_csm_map(wks,res) ; Create a map.
; Set up resources for polymarkers.
gsres = True
gsres@gsMarkerIndex = 16 ; filled dot
;gsres@gsMarkerSizeF = 0.005 ; default - 0.007
cols = (/5,160,40/)
; Set up resources for polylines.
res_lines = True
res_lines@gsLineThicknessF = 3.; 3x as thick
dot = new(ndate,graphic) ; Make sure each gsn_add_polyxxx call
line = new(ndate,graphic) ; is assigned to a unique variable.
; Loop through each date and add polylines to the plot.
do i = 0,ndate-2
res_lines@gsLineColor= cols(0)
xx=(/lon2d(imin(i),jmin(i)),lon2d(imin(i+1),jmin(i+1))/)
yy=(/lat2d(imin(i),jmin(i)),lat2d(imin(i+1),jmin(i+1))/)
line(i) = gsn_add_polyline(wks,plot,xx,yy,res_lines)
end do
lon1d = ndtooned(lon2d)
lat1d = ndtooned(lat2d)
; Loop through each date and add polymarkers to the plot.
do i = 0,ndate-1
print("dot:"+lon1d(smin(i))+","+lat1d(smin(i)))
gsres@gsMarkerColor = cols(0)
dot(i)=gsn_add_polymarker(wks,plot,lon1d(smin(i)),lat1d(smin(i)),gsres)
end do
; Date (Legend)
txres = True
txres@txFontHeightF = 0.015
txres@txFontColor = cols(0)
txid1 = new(ndate,graphic)
; Loop through each date and draw a text string on the plot.
do i = 0, ndate-1
txres@txJust = "CenterRight"
ix = smin(i) - 4
print("Eye:"+ix)
if(i.eq.1) then
txres@txJust = "CenterLeft"
ix = ix + 8
end if
txid1(i) = gsn_add_text(wks,plot,sdate(i),lon1d(ix),lat1d(ix),txres)
end do
; Add marker and text for legend. (Or you can just use "pmLegend" instead.)
txres@txJust = "CenterLeft"
txid2 = new(nexp,graphic)
pmid2 = new(nexp,graphic)
do i = 0,nexp-1
gsres@gsMarkerColor = cols(i)
txres@txFontColor = cols(i)
ii = ((/129,119,109/)) ; ilat
jj = ((/110,110,110/)) ; jlon
ji = ii*mlon+jj; col x row
pmid2(i) = gsn_add_polymarker(wks,plot,lon1d(ji(i)),lat1d(ji(i)),gsres)
txid2(i) = gsn_add_text(wks,plot,EXP(i),lon1d(ji(i)+5),lat1d(ji(i)),txres)
end do
draw(plot)
frame(wks)
end
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