Question about the CLM mask

[xujunhan@gmail_com]

Dear all,

I split the research area to 16 blocks and there are some block I don't want to simulate. I assign the land fraction to zeros in all grid cells.

I am running CLM in hourly step and my forcing data is in daily format.

If I run CLM for one year, CLM will read all the forcing files even all the land fraction values of some blocks are all zeros. It means there are no valid grid cells in these blocks. Like:

(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/ForcingData/Micromet_1km_1hour_Heihe/CLM/2007-01-01.nc 1
(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/ForcingData/Micromet_1km_1hour_Heihe/CLM/2007-01-01.nc 2
(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/SysModel/CLM4/inputdata/atm/cam/chem/trop_mozart_aero/aero/aerosoldep_monthly_2000_mean_1.9x2.5_c090421.nc 12
(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/SysModel/CLM4/inputdata/atm/cam/chem/trop_mozart_aero/aero/aerosoldep_monthly_2000_mean_1.9x2.5_c090421.nc 1
(datm_comp_run) max values = 263.88641357421875 0.0000000000000000 0.0000000000000000
(datm_comp_run) atm: model date 20070101 0s
(datm_comp_init) datm_comp_init done
(datm_comp_run) atm: model date 20070101 0s
(datm_comp_init) datm_comp_init done
(datm_comp_run) atm: model date 20070101 3600s
(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/ForcingData/Micromet_1km_1hour_Heihe/CLM/2007-01-01.nc 3
(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/ForcingData/Micromet_1km_1hour_Heihe/CLM/2007-01-01.nc 4
(datm_comp_run) atm: model date 20070101 7200s
(datm_comp_run) atm: model date 20070101 10800s
(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/ForcingData/Micromet_1km_1hour_Heihe/CLM/2007-01-01.nc 5
(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/ForcingData/Micromet_1km_1hour_Heihe/CLM/2007-01-01.nc 6
(datm_comp_run) atm: model date 20070101 14400s
(datm_comp_run) atm: model date 20070101 18000s
(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/ForcingData/Micromet_1km_1hour_Heihe/CLM/2007-01-01.nc 7
(shr_dmodel_readLBUB) reading file: /disk3/hanxujun/HDAS_Data/ForcingData/Micromet_1km_1hour_Heihe/CLM/2007-01-01.nc 8
(datm_comp_run) atm: model date 20070101 21600s
(datm_comp_run) atm: model date 20070101 25200s


I think CLM should determine the number of valid grid cells before reading the forcing data. If not, this will slow down the CLM.

Best Regards!

Xujun