gsn_csm_pres_hgt没办法倒转纵坐标

britannia

最近用gsn_csm_pres_hgt画几张ERA5数据的气压-时间剖面图，全程没有报错，但是发现使用trYReverse=True压根没用，不加trYReverse=True纵坐标Y轴顶端也是200hPa，但数据中(0,0)对应的200hPa数据却没有画到顶端，还是画在了底端，不论怎么调都换不过去，最后还是用了gsn_contour，可算能自由颠倒Y轴值了，求助各位大神，这是怎么回事？
下边是我的作图部分代码：
a=addfile(filename1,"r")
time=a->time
ddhh_zuobiao=ispan(0, 72, 1) ;画图横坐标设置
z=a->level(0:10)

d1=short2flt(a->d(48:120,0:10,20,36))
d1=d1*(10^5)
d12=transpose(d1)

res1=True
res1@cnLinesOn=False
res1@cnFillOn  = True
res1@cnLineLabelsOn =False
res1@gsnPresHgtHeightLabelOn=False
res1@gsnAddCyclic = False
res1@sfXArray=ddhh_zuobiao
res1@sfYArray=z
res1@tiYAxisString="pressure(hPa)"
res1@tiXAxisString="time"

res1@tmYLMode   = "Explicit"  
res1@tmYLValues   = z
res1@tmYLLabels=(/"200","","300"," ","400"," ","500"," ","600"," ","700"/)
res1@cnLevelSelectionMode="ExplicitLevels"
res1@cnLevels  =(/-20,-15,-10,-5,0,5,10,15,20/)
res1@cnFillColors=(/5,6,7,8,9,12,13,14,15,16/)
res1@lbLabelBarOn  =False

plot=gsn_csm_pres_hgt(wks, d12, res1)



用来画图的数据格式如下：Variable: d12
Dimensions and sizes:   [level | 11] x [time | 73]
Coordinates:
            level: [200..700]
            time: [1080048..1080120]
Number Of Attributes: 9
  longitude :   99
  latitude :    40
  units :       s**-1
  long_name :   Divergence
  standard_name :       divergence_of_wind