Issue with Long-Term CLM5 Simulation Using Custom Input Data

[lfu]

Hi,

I ran a single-point, long-term time-series simulation in CLM5 using my own input data.

I made the following changes in env_run.xml:

./xmlchange DATAM_MODE=CLM1PT
./xmlchange PTS_LAT=10.8785
./xmlchange PTS_LON=274.6594
./xmlchange STOP_OPTION=nyears
./xmlchange STOP_N=86
./xmlchange DATM_YR_ALIGN=2015
./xmlchange DATM_YR_START=2100
./xmlchange DATM_YR_END=2014
./xmlchange CLM_USRDAT_NAME=monthly370
./xmlchange CLM_USRDAT_DIR=/glade/derecho/scratch/lfu/ssp_atm_input/IPSL-CM6A-LR/CR_single_sites

Additionally, I added the following input paths in user_nl_datm_streams:

CLM_USRDAT.monthly585:year_first=2015
CLM_USRDAT.monthly585:year_last=2100
CLM_USRDAT.monthly585:year_align=2015
CLM_USRDAT.monthly585:dtlimit=1.5
CLM_USRDAT.monthly585:offset=0
CLM_USRDAT.monthly585:tintalgo=nearest
CLM_USRDAT.monthly585:mapalgo=nn
CLM_USRDAT.monthly585:taxmode=cycle

Issue Description

The model ran successfully. However, when I loaded the output NetCDF file, I noticed that the time coordinate in the dataset spans from 2000 to 2086 (as shown in the attached figure).

Additionally, the simulated temperature suddenly decreases sharply after 15 years from the start of the simulation.

I am unsure what might be causing this issue. Could you please help me identify the problem?

Thank you!

 

[oleson]

I would look at your RUN_STARTDATE in env_run.xml. Is it consistent with the date you want to start the model at?
These settings also seem inconsistent:

./xmlchange DATM_YR_ALIGN=2015
./xmlchange DATM_YR_START=2100
./xmlchange DATM_YR_END=2014

Do you want:

./xmlchange DATM_YR_ALIGN=2015
./xmlchange DATM_YR_START=2015
./xmlchange DATM_YR_END=2100

What years do your forcing data span?

 

[lfu]

I would look at your RUN_STARTDATE in env_run.xml. Is it consistent with the date you want to start the model at?
These settings also seem inconsistent:

./xmlchange DATM_YR_ALIGN=2015
./xmlchange DATM_YR_START=2100
./xmlchange DATM_YR_END=2014

Do you want:

./xmlchange DATM_YR_ALIGN=2015
./xmlchange DATM_YR_START=2015
./xmlchange DATM_YR_END=2100

What years do your forcing data span?

Oh I wrote above is incorrect. When I ran the model, I set the date as following in my env_run.xml:

./xmlchange DATM_YR_ALIGN=2015
./xmlchange DATM_YR_START=2015
./xmlchange DATM_YR_END=2100

My forcing data span from 2015-01 to 2100-12, I added the path in user_nl_datm_streams.
My case path is in u/home/lfu/CostaRica_single_b_ssp/I2000_CTSM_singlept_single_b_CR_N1_ssp370/
Thank you!

 

[oleson]

./xlmquery RUN_STARTDATE in your case directory yields:

RUN_STARTDATE: 2000-01-01

I assume you want to start the model in 2015? If so, you should set RUN_STARTDATE to 2015-01-01