Fix land-mask creation and use transparent land overlay

example_08_ERAIN_SFC12_MM_deseasoned_Tropical_Atlantic_wind_stress.jnl

@@ -11,10 +11,10 @@ cancel data climatological_axes
 
 se region/y=30S:30N/x=60W:20E
 
-let ocean_mask = if LSM[d=3, l=@max] == 0 then 1
+let ocean_mask = if LSM[d=3, l=@max] eq 0 then 1
 
-let taux = IEWS[d=1] * LSM[gxy = IEWS[d=1]@asn]
-let tauy = INSS[d=2] * LSM[gxy = INSS[d=2]@asn]
+let taux = IEWS[d=1] * ocean_mask
+let tauy = INSS[d=2] * ocean_mask
 
 let taux_seasonal_cycle = taux[gt=month_gregorian@mod]
 let tauy_seasonal_cycle = tauy[gt=month_gregorian@mod]
@@ -27,11 +27,11 @@ se window/asp=2/siz=2
 ! plot mean wind stress
 se viewp upper
 vector/yskip=2/title="mean wind stress" taux[l=@ave], tauy[l=@ave]
-go fland
+go land
 
 ! plot wind stress anomalies (w.r.t. seasonal cycle) for a given day
 set viewp lower
 vector/length=3e-2/title="wind stress an. May 1982"/t="15-Mar-1982" taux_deseasoned, tauy_deseasoned
-go fland
+go land
 
 frame/file="example_08_ERAIN_SFC12_MM_deseasoned_Tropical_Atlantic_wind_stress.png"