-------------------------- CPTEC Global Analysis ----------------------------------
-Pacific and South American section

- There are two dataset, covering different domains:
  -GPSATRS: tropospheric domain;
  -GPSASTS: stratospheric domain;
  
- The data is stored in GRIB format. The grid points are defined as the following:
 Longitude: 81 points starting in 150°W, with constant delta-lon of 1.875°
 Latitude: 51 points at the following latitudes:
           -62.486 -60.620 -58.755 -56.890 -55.025 -53.160 -51.294 -49.429 -47.564 
	   -45.699 -43.833 -41.968 -40.103 -38.238 -36.372 -34.507 -32.642 -30.777 
	   -28.911 -27.046 -25.181 -23.316 -21.450 -19.585 -17.720 -15.855 -13.989 
	   -12.124 -10.259  -8.394  -6.528  -4.663  -2.798  -0.933   0.933   2.798   
	     4.663   6.528   8.394  10.259  12.124  13.989  15.855  17.720  19.585  
	    21.450  23.316  25.181  27.046  28.911  30.777 
 Vertical: (Tropospheric)  7 Isobaric levels: 1000 925 850 700 500 300 200  [  hPa]
           (Stratospheric) 4 Isobaric levels:  100  70  50  30              [  hPa] 
 Time: 304 times, beginning on June 1st, 2001, 00 GMT, with constant 6-hour intervals.

Surface variables:
psnm - Sea level Pressure [hPa]
tsfc - Surface temperatur [  K]

Pressure-level variables:
mask - Land/ocean mask
uvel - Zonal component of wind                [  m/s]
vvel - Meridional component of wind           [  m/s]
omeg - Vertical velocity in terms of pressure [ Pa/s]
fcor - Stream function                        [ m²/s]
potv - Velocity potencial                     [ m²/s]
zgeo - Geopotential height                    [  gpm]
temp - Temperature                            [    K]
umrl - Relative humidity                      [ n.d.]
umes - Specific humidity                      [kg/kg]

Each time has a CTL file which describes the Grib file (grb), so GrADS can also be used. analise_GPSA.ctl
and estratosfera_GPSA are template CTL files which cover the whole period (for tropospheric and stratospheric 
domain, respectively). The gmp files were generated with gribmap and must be downloaded or generated again.