How are longitudinal and latitudinal ranges specified in JULES?
You can look at the namelists in the tutorial for the gridded JULES on the UofR Land Surface Processes website. There are some regional settings in the suite described in the suite that are commented out.
So if you open up the file u-as052/app/jules/rose-app.conf in a text editor, you can see the commented out section in model_grid, and then study the differences, and then uncomment and modify the setting that works for you. For example, the first option below are some good settings for global models, whereas the commented out version below that are some good settings for regionally-limited models:
[namelist:jules_model_grid]
force_1d_grid=.false.
land_only=.false.
!!lat_bounds=0
!!latlon_region=.false.
!!lon_bounds=0
!!npoints=0
!!points_file=''
use_subgrid=.false.
#[namelist:jules_model_grid]
#force_1d_grid=.false.
#land_only=.false.
#lat_bounds= 45 65
#latlon_region=.true.
#lon_bounds= -10 5
#!!npoints=0
#!!points_file=''
#use_subgrid=.true.
Patrick
How can a single point be specified so that the latitudinal and longitudinal bounds to represent a single site?
For example in u-as052/app/jules/rose-app.conf
Is it possible to run
[namelist:jules_model_grid]
force_1d_grid=.false.
land_only=.false.
lat_bounds=53.32,53.32
latlon_region=.true.
lon_bounds=-0.6,-0.6
!!npoints=0
!!points_file=‘’
use_subgrid=.true.
Hi Noel:
I would be surprised if that works.
The WFDEI grid has grid-cells centered on the 0.25 degrees and 0.75 degrees Lat/Lon.
Maybe instead, you could try it with
lat_bounds=53.00,53.50
lon_bounds=-1.0,-0.5
The WFDEI grid cell boundaries are at multiples of 0.5 degrees Lat/Lon, starting at 0.0, so the values above for lat_bounds and lon_bounds will only get the single grid cell centred on 53.25 degrees Lat and -0.75 degrees Lon. It doesn’t do any interpolation, so it isn’t precisely 53.32,-0.6. The sampling is nearest-neighbor.
I think if you use:
lat_bounds=53.32,53.32
lon_bounds=-0.6,-0.6
then there won’t be any points selected, since this region doesn’t contain 53.25,-0.75.
If you’re doing single-point runs, you might consider using a single-point suite (like the loobos one that is frequently quoted) instead of using the gridded JULES suite u-as052. There’s also the single-point suite, u-al752, which you know about, but that uses data at the FLUXNET sites. But you might be interested in doing things with gridded suite u-as052, since maybe the single-points are at non-FLUXNET locations and you want to use WFDEI driving data and the WFDEI ancillaries that are pointed to by the u-as052 suite.
Patrick