"file name specification error" when reading in new namelist file within COSP.

[jshaw35]

Hi all,

I am coupling a new version of the COSP satellite simulator package into CAM/CESM2. Within the new COSP code, I read in namelists for different instruments to simulate. The paths to these namelists are passed through the standard "cospsimulator_nl" namelist using modifications to the user_cam_nl file. The code used to read in the namelists works fine in the offline COSP driver, but I am getting errors when that code is now called within CESM.

Specifically, when I attempt to read in a namelist file (/glade/scratch/jonahshaw/20230718_test_atmonlyfast/run/instrument_nls/cosp2_rttov_inst1.txt), I get the following error:

'file name specification error, unit 10, file "Unknown" '

The code used to read in the namelist is below. I have also attached a copy of the namelist file. The "namelist_filepath" variable is set to "/glade/scratch/jonahshaw/20230718_test_atmonlyfast/run/instrument_nls/cosp2_rttov_inst1.txt". If this path does not exist I get an appropriate error ("file not found, unit 10, file"), so I know the code is looking at the correct file.

Any suggestions and advice are appreciated. Thank you!
-- Jonah

The run fails at the read step: read(10,nml=trim(RTTOV_INPUT))


! Read RTTOV namelist fields
namelist/RTTOV_INPUT/Lrttov_bt,Lrttov_rad,Lrttov_refl,Lrttov_cld, & ! Logicals for RTTOV configuration
Lrttov_aer,Lrttov_cldparam,Lrttov_aerparam, & !
Lrttov_pc,nchannels_rec,Lchannel_filepath, &
channel_filepath,rttov_srcDir,rttov_coefDir, &
OD_coef_filepath,aer_coef_filepath,cld_coef_filepath, &
PC_coef_filepath, &
CO2_data,CH4_data,CO_data,N2O_data,SO2_data,ozone_data, & ! User-supplied trace gas concentrations
clw_data, & ! MW option
CO2_mr,CH4_mr,CO_mr,N2O_mr,SO2_mr, & ! Mixing ratios
ipcbnd,ipcreg,npcscores, & ! PC-RTTOV config values
rttov_nthreads,rttov_ZenAng


! Read in namelists
open(10,file=namelist_filepath,status='unknown')
read(10,nml=RTTOV_INPUT)
close(10)

 

[jedwards]

You didn't point me to the read code, are all of your variables declared and
of the type expected? Also you didn't tell what error you are getting.

 

[jshaw35]

Hi Jim,

I pasted the read code at the bottom of the original post. Is there something else that I should provide?

And yes, all of the variables are declared and of the type expected. This code runs without errors using the offline COSP driver.

The error I am getting is: 'file name specification error, unit 10, file "Unknown" '

Best,
Jonah

 

[jedwards]

Hi Jonah,

I can try to take a look at this - can you tell me how to reproduce the problem on cheyenne?