The standard version of the QTCM1 provides coverage from S to N in latitude and coverage over all longitudes. The grid has dimensions equal to 64 42. The east/west boundaries are periodic, and the north/south boundaries are solid walls. Thus, the grid spacing is 5.625 [i.e. ] degrees longitude and 3.75 [i.e. ] degrees latitude.
The first index increments in the zonal (x) direction with increasing longitude in the eastward direction, beginning at 0 degrees E longitude. The second index increments in the meridional (y) direction with increasing latitude northward, beginning at S latitude (i.e. latitude). Thus:
grid box (1,1) is centered at E longitude,
latitude
grid box (2,1) is centered at E longitude,
latitude
grid box (2,2) is centered at E longitude,
latitude
grid box ( )
is centered at E longitude,
latitude
The spatial array sizes nx and ny are
set in the module file qtcmmod.f90
Higher resolution can be easily achieved by modifying hgrid.h and
subroutine parinit
. Higher resolution boundary data sets can be created
using a package released along with this version of model. See
Section 2.4.3 for details.
Section 3.2.3 has a more complete description of the
model grid.