Merge branch 'add-era-land-mask' into 'master'

Add era land mask

See merge request !11

example_08_ERAIN_SFC12_MM_deseasoned_Tropical_Atlantic_wind_stress.jnl

@@ -3,6 +3,7 @@ cancel var/all
 
 use "/data/c2/TMdata/git_geomar_de_data/ERAIN_SFC12_MM/v2.x.x/data/nc/ERAIN_SFC12_MM_IEWS_229_1-456.nc"
 use "/data/c2/TMdata/git_geomar_de_data/ERAIN_SFC12_MM/v2.x.x/data/nc/ERAIN_SFC12_MM_INSS_230_1-456.nc"
+use "/data/c2/TMdata/git_geomar_de_data/ERAIN_SFC12_MM/v2.x.x/data/nc/ERAIN_SFC00_MM_LSM_172_1-456.nc"
 
 ! load climatological axes
 use climatological_axes
@@ -10,8 +11,10 @@ cancel data climatological_axes
 
 se region/y=30S:30N/x=60W:20E
 
-let taux = IEWS[d=1]
-let tauy = INSS[d=2]
+let ocean_mask = if LSM[d=3, l=@max] eq 0 then 1
+
+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]
@@ -24,11 +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"