Atmospheric forcing

File description

In SELFE, atmoserpic forcings include wind, air pressure and temperature, precipitation, humidity and longwave and shortwave fluxes. These are specified in the netcdf files inside sflux/ dir. There are 4 types of files in this dir:

1. sflux_inputs.txt:
   $cat sflux_inputs.txt
   &sflux_inputs !file name
   start_year = 1998, !start year
   start_month = 09, !start month
   start_day = 01, !start day
   start_hour = 0.0, !start hour
   utc_start = 0.0, !offset from UTC in hours, with positive numbers for western hemishpere
   /
   
2. sflux_air_1.0*.nc: netcdf files that have time, wind speed, air temperature and pressure and specific humidity; see sample files at [1]
3. sflux_prc_1.0*.nc: netcdf files that have precipitation data; see sample files at [2]
4. sflux_rad_1.0*.nc: netcdf files that have downward long and short wave radiation fluxes; see sample files at [3]

Using NARR files for your simulation (North America only)

First, make sure the  NARR grid covers your hgrid.ll. 

In your run directory, mkdir sflux and inside it, create symbolic links to the NARR files. e.g., if you run starts from June 10, 2004 and ends June 20, 2004, then

sflux_air_1.001.nc --> narr_air.2004_06_10.nc
sflux_air_1.002.nc --> narr_air.2004_06_11.nc
...
sflux_air_1.011.nc --> narr_air.2004_06_20.nc
sflux_air_1.012.nc --> narr_air.2004_06_21.nc (extra day to account for time zone difference)

Similarly for sflux_rad_*.nc and sflux_prc_*.nc. The number "1" after "air_" denotes first data set used; you can use up to 2 sets in SELFE (which combines them with some given weights set in sflux_subs.F90); here you only use 1 set.

Don't forget to update sflux_inputs.txt also.