Content of Output

The fields described in Table 1.1 are written to q.out and qmean.out in the following manner:

• The timesteps are written out in ascending order.
• At each timestep, the entire spatial grid for each variable is outputted to the file.
• Each spatial grid is written out in conventional FORTRAN array format (with the first index written out in ascending order, then the second index, and so on). Thus, the array for zonal wind (baroclinic mode) is written out in the following order:

  
  
  
  
  

  Note that for the meridionally staggered variables that are dimensioned in the y-direction from 0:NY, the southern boundary (i,0) is not output. This is because the value at the southern boundary is set to zero in the model. See Section 2.3.1 for more details.

• When meridionally staggered variables are output, QTCM1 pretends they are actually located at the grid points (i,j), i.e. where T is located; QTCM1 doesn't interpolate these staggered variables to the grid points (i,j). Thus, if you wish to have the ``true'' value of the meridionally staggered variables at (i,j), you will need to interpolate accordingly. Some of these meridionally staggered variables include u1, v1, u0, and v0. See Section 2.2.2 for more details.
• The order of variable output is that given in the variables list in Table 1.1. A total of 31 variables are output. Note that variables are output as REAL 4, not REAL 8.

  
Table 1.1: Variables outputted into q.out and qmean.out

In the standard version of QTCM1, the temporary arrays listed in Table 1.1 are set to the following model variables:

Note that some of the variable units given in Table 1.1 are ``non-conventional,'' i.e. they are in units different from those in which they are usually found. For instance, precipitation is usually given in mm/day; the model outputs the parameter in . A few conversion factors to more ``conventional'' units are given below (see the GrADS script qtcmpar.gs for more conversion factors):

Note also that because output files are written in sequential access, they have FORTRAN 77 control words embedded in the records. Thus, in order to properly read the output files, the sequential option needs to be specified in GrADS, and the /F77_UNFORMATTED keyword needs to be specified in the IDL OPEN procedure.