! jnl file that uses Argo data to make different vertical section temperature anomaly plots.  The sections are either
! in a N-s direction or an E-W direction.  This does not make arbitrary section plots.  The anomaly is from the yearly 
! mean.
! This file requires input arguments for the location of section, the time range, the depth range and the distance range.

! To run the program in ferret, you will need to type the following line with or without the various values 
! filled in:

! go fer_temp_section_yearly_anom section_direction section_location time_start time_end depth_min depth_max xlo xhi con_lev 

! If you choose not to give values for the various variables, default ones will be substituted for you.
! If you only want to choose some values, you can, but you cannot skip any values.  This means you can 
! fill in the first 2 and no others, or if you want to specify the time ranges, you must do the first 4.
! You can't choose to do the section_direction and the depth_min and depth_max without filling in the 
! section_location and the time_start and time_end


! section direction can be "N" for N-S or "E" for E-W

! xlo corresponds to the lowest latitude limit  
! xhi corresponds to the highest latitude limit  
! ylo corresponds to the lowest longitude limit 
! yhi corresponds to the highest longitude limit

! depth values are entered in the range of 0 - 2000dbar with the default being 0 - 1000dbar

! time values are entered corresponding to monthly values starting with Jan, 2004 
! con_lev sets the contour and fill levels of the plot.  This is done in the following format:  (lo,hi,delta).  
! More than one can be chosen:  (lo,mid,delta1),(mid,hi,delta2).  See the Ferret Users Manual for more information.
! if no values are entered, the default is the year 2006


cancel/all data
cancel/all var
cancel/all sym
set window/clear
go set_pixel_size 1024 768
set mem/size=60
define viewport/xlim=.0,.95/ylim=0,1 top

PPL DFLTFNT DR
ppl conpre @P1@DR
ppl axlsze 0.15,.15
ppl axset 1,1,1,1
ppl pen 0,7
ppl pen 1,7
ppl labset .15,.15,.15

use RG_ArgoClim_Full.nc
let temp=ARGO_TEMPERATURE_MEAN[d=1]+ARGO_TEMPERATURE_ANOMALY[d=1]
let psal=ARGO_SALINITY_MEAN[d=1]+ARGO_SALINITY_ANOMALY[d=1]
let dyn_p=z[d=1,g=`temp, return=grid`]

let depth_min=`$6%0%`
let depth_max=`$7%1000%`
let time_start=`$4%12%`
let time_end=`$5%36%`

! setting the default values
let xlo=`$8%130%`
let xhi=`$9%180%`
let ylo=`$2%-50%`
let yhi=`$3%-45%`
set mode interpolate
! start of plotting section.  

! setting depth region
set region/z=`depth_min`:`depth_max`

! a vertical section can only be made if the depths are different. 
! depth is the same
let a=if `depth_max` eq `depth_min` then 1 else 0
if `a` then 
say "depth is the same - cannot graph a section"
endif

! time is the same - do not average
let b=if `time_start` eq `time_end` then 1 else 0 
let c=if (`xlo`) ne (`xhi`) then 1 else 0
let d=if (`ylo`) ne (`yhi`) then 1 else 0
let boundb=if (`xlo`) gt (`xhi`) then 1 else 0

if `b` then 
if ($1%TRUE|N>TRUE|E>FALSE|>TRUE%) then 	!checking whether it is a N-S or E-W section & assigning N-S as default
if `c` then 
! setting the default values
let t_anom=temp[x=`xlo`:`xhi`@ave,y=`ylo`:`yhi`,z=`depth_min`:`depth_max`,l=`time_start`]-temp[x=`xlo`:`xhi`@ave,y=`ylo`:`yhi`,z=`depth_min`:`depth_max`,l=@ave]
let anom_max=t_anom[y=@max,z=@max]
let anom_min=t_anom[z=@min,y=@min]

else ! no averaging over x

let t_anom=temp[x=`xlo`,y=`ylo`:`yhi`,z=`depth_min`:`depth_max`,l=`time_start`]-temp[x=`xlo`,y=`ylo`:`yhi`,z=`depth_min`:`depth_max`,l=@ave]
let anom_max=t_anom[y=@max,z=@max]
let anom_min=t_anom[z=@min,y=@min]
endif 	! c loop

else	! E-W section

! Ensuring longitudes are properly plotted

if `boundb` then
let xhi=`xhi`+360
endif 


if `d` then 

let t_anom=temp[x=`xlo`:`xhi`,y=`ylo`:`yhi`@ave,z=`depth_min`:`depth_max`,l=`time_start`]-temp[x=`xlo`:`xhi`,y=`ylo`:`yhi`@ave,z=`depth_min`:`depth_max`,l=@ave]
let anom_max=t_anom[x=@max,z=@max]
let anom_min=t_anom[z=@min,x=@min]

else ! no averaging over y


let t_anom=temp[x=`xlo`:`xhi`,y=`ylo`,z=`depth_min`:`depth_max`,l=`time_start`]-temp[x=`xlo`:`xhi`,y=`ylo`,z=`depth_min`:`depth_max`,l=@ave]
let anom_max=t_anom[x=@max,z=@max]
let anom_min=t_anom[z=@min,x=@min]

endif 	! d loop
endif	! b loop
endif 	! n-s loop


! time is different
let e= if `b` eq 0 then 1 else 0
if `e` then
if ($1%TRUE|N>TRUE|E>FALSE|>TRUE%) then 	! N-S section

if `c` then

let t_anom=temp[x=`xlo`:`xhi`@ave,y=`ylo`:`yhi`,z=`depth_min`:`depth_max`,l=`time_start`:`time_end`@ave]-temp[x=`xlo`:`xhi`@ave,y=`ylo`:`yhi`,z=`depth_min`:`depth_max`,l=1:60@ave]
let anom_max=t_anom[y=@max,z=@max]
let anom_min=t_anom[z=@min,y=@min]

else 	! no averaging over x

let t_anom=temp[x=`xlo`,y=`ylo`:`yhi`,z=`depth_min`:`depth_max`,l=`time_start`:`time_end`@ave]-temp[x=`xlo`,y=`ylo`:`yhi`,z=`depth_min`:`depth_max`,l=1:60@ave]
let anom_max=t_anom[y=@max,z=@max]
let anom_min=t_anom[z=@min,y=@min]
endif 	! c loop

else	! E-W section
if `boundb` then
let xhi=`xhi`+360
endif 

if `d` then 
let t_anom=temp[x=`xlo`:`xhi`,y=`ylo`:`yhi`@ave,z=`depth_min`:`depth_max`,l=`time_start`:`time_end`@ave]-temp[x=`xlo`:`xhi`,y=`ylo`:`yhi`@ave,z=`depth_min`:`depth_max`,l=1:60@ave]
let anom_max=t_anom[x=@max,z=@max]
let anom_min=t_anom[z=@min,x=@min]

else 	! no averaging over y

let t_anom=temp[x=`xlo`:`xhi`,y=`ylo`,z=`depth_min`:`depth_max`,l=`time_start`:`time_end`@ave]-temp[x=`xlo`:`xhi`,y=`ylo`,z=`depth_min`:`depth_max`,l=1:60@ave]
let anom_max=t_anom[x=@max,z=@max]
let anom_min=t_anom[z=@min,x=@min]
endif 	! d loop
endif	! e loop
endif	! n-s loop


! creating an equal, centered key
let abs_max=ABS(`anom_max`)
let abs_min=ABS(`anom_min`)
! case where anom_max is bigger than anom_min
let maxz=if `abs_max` gt `abs_min` and `abs_max` lt 1 then 1 else 0
if `maxz` then
let lev_max = (int(10*abs_max)+1)/10
let lev_min = (int(-10*abs_max)-1)/10
endif
let maxnz=if `abs_max` gt `abs_min` and `abs_max` gt 1 then 1 else 0
if `maxnz` then
let lev_max=int(anom_max)+1
let lev_min=int((-1*anom_max))-1
endif
let anom_diff=lev_max-lev_min
let anom_delta=anom_diff/8

! case where anom_min is bigger than anom_max
let minz=if `abs_min` gt `abs_max` and `abs_min` lt 1 then 1 else 0
if `minz` then
let lev_max = (int(10*abs_min)+1)/10
let lev_min = (int(10*anom_min)-1)/10
endif
let minnz=if `abs_min` gt `abs_max` and `abs_min` gt 1 then 1 else 0
if `minnz` then
let lev_max=int(abs_min)+1
let lev_min=int(anom_min)-1
endif
let anom_diff=lev_max-lev_min
let anom_delta=anom_diff/8

let con_lev= $10&"(`lev_min`,`lev_max`,`anom_delta`)"|*>"*"&

! plotting
fill/set/nolab/pal=cofi_pot_centered/lev="`con_lev`"  t_anom
ppl shakey 1,,.08,,5,,,,,,
ppl ylab Pressure (dbar)
ppl fill
 
! adding contours
 con/set_up/over/nolab/lev="`con_lev`" t_anom 
 ppl conset .11,,,,,,,5.7,1.,1
 ppl contour/overlay


! adding in etopo6 to give bathymetry
use etopo6_grid.nc

if ($1%TRUE|N>TRUE|E>FALSE|>TRUE%) then 	! N-S section

if `c` then
let mskb if btdata*(-1) lt dyn_p then 1
repeat/x=`xlo`:`xhi` shad/over/nolab/nokey/pal=black mskb[y=`ylo`:`yhi`,z=`depth_min`:`depth_max`]

else
let mskb if btdata*(-1) lt dyn_p then 1
shad/over/nolab/nokey/pal=black mskb[x=`xlo`,y=`ylo`:`yhi`,z=`depth_min`:`depth_max`]
endif

else	! E-W section

if `d` then
let mskb if btdata*(-1) lt dyn_p then 1
repeat/y=`ylo`:`yhi` shad/over/nolab/nokey/pal=black mskb[x=`xlo`:`xhi`,z=`depth_min`:`depth_max`]

else
let mskb if btdata*(-1) lt dyn_p then 1
shad/over/nolab/nokey/pal=black mskb[y=`ylo`,x=`xlo`:`xhi`,z=`depth_min`:`depth_max`]
endif

say Plot is finished
say To adjust parameters, use the command line to pass arguments
say For this file, the form to pass arguments is
say go fer_temp_plot section_direction xlo xhi time_start time_end depth_min depth_max xlo xhi con_lev