next up previous contents
Next: Miscellaneous Notes Up: Introduction and Model Description Previous: Overview

Model Spatial and Temporal Coverage

The current version of the QTCM provides coverage from tex2html_wrap_inline993 S to tex2html_wrap_inline993 N in latitude and coverage over all longitudes. The grid has dimensions tex2html_wrap_inline997 equal to 64 tex2html_wrap_inline999 33. The east/west boundaries are periodic, and the north/south boundaries are solid walls, with sponge layers from tex2html_wrap_inline1001 S to tex2html_wrap_inline993 S, and tex2html_wrap_inline1001 N to tex2html_wrap_inline993 N. Thus, the grid spacing is 5.625 [i.e. 360/NX] degrees longitude and 3.75 [i.e. 120/(NY-1)] degrees latitude.

Following FORTRAN convention, 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 tex2html_wrap_inline993 S latitude (i.e. tex2html_wrap_inline1019 latitude). Thus:

grid box (1,1) is centered at tex2html_wrap_inline1021 E longitude, tex2html_wrap_inline1019 latitude
grid box (2,1) is centered at tex2html_wrap_inline1025 E longitude, tex2html_wrap_inline1019 latitude
grid box (2,2) is centered at tex2html_wrap_inline1025 E longitude, tex2html_wrap_inline1031 latitude
grid box (NX,NY) is centered at tex2html_wrap_inline1037 E longitude, tex2html_wrap_inline993 latitude

The spatial array sizes NX and NY are set in the header file hgrid.h. Higher resolution can be easily achieved by modifying hgrid.h and subroutine parinit. However, revised boundary data sets will then need to be supplied. Section 3.2.2 has a more complete description of the model grid.



Johnny Wei-Bing Lin
Mon Jun 30 12:27:46 PDT 1997