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CLM5-BGC regional simulation

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renqiujie

renqiujie
New Member
Dear alls，
I have such a problem at present about regional simulation, I used GSWP3 to simulate the NPP in China,
My compset is 2000_DATM%GSWP3v1_CLM50%BGC_SICE_SOCN_MOSART_SGLC_SWAV, DATM_MODE=CLM1PT
set up for spin-up with
./xmlchange CLM_ACCELERATED_SPINUP=on
./xmlchange CLM_FORCE_COLDSTART=on

The output file has the following information in cesm.log.

max rss=236.3 MB
Negative conc. in ch4tran. c,j,deficit (mol): 34297 2
1.806376198593366E-003

The next spin-up
./xmlchange CLM_ACCELERATED_SPINUP=off
./xmlchange CLM_FORCE_COLDSTART=off

also has some message in cesm.log
max rss=243.4 MB
Negative conc. in ch4tran. c,j,deficit (mol): 63314 1
1.274813550283766E-003
max rss=243.4 MB

In finial simulation my compset is HIST_DATM%GSWP3v1_CLM50%BGC_SICE_SOCN_MOSART_SGLC_SWAV, years from 2000-2015
in cesm.log* file has the following messages
max rss=236.2 MB
Warning: Jmx25 become unrealistic (>2000, or negative) for patch= 95002 z
= 1 pft= 15
LUNA env: 2078.99161533924 NaN
88412.2366800989 0.391366417311874 32.6010376465009
18478.1574661407 NaN NaN
52.8262016763391 12.0768042335388 13.4353060799742
21.4122978088068 5.87123228557414
max rss=236.2 MB
max rss=236.2 MB
Negative conc. in ch4tran. c,j,deficit (mol): 15576 1
1.329153802668925E-003
max rss=236.2 MB
max rss=236.2 MB
max rss=236.2 MB
Note: sink > source in ch4_tran, sources are changing quickly relative to diff
usion timestep, and/or diffusion is rapid.
Latdeg,Londeg= 31.7500000000000 108.750000000000
This typically occurs when there is a larger than normal diffusive flux.
If this occurs frequently, consider reducing land model (or methane model) tim
estep, or reducing the max. sink per timestep in the methane model.
Negative conc. in ch4tran. c,j,deficit (mol): 72760 1
1.793365960285568E-002
max rss=236.2 MB

This seems to be the problem with the methane model. Any Suggestions?
If I only focus on the simulation effect of carbon and nitrogen cycle in China, such as NPP, can I turn off the methane model?

Thanks all
 
O

oleson

Keith Oleson
CSEG and Liaisons
Staff member
You can turn off the methane model by setting: use_lch4 = .false.
It's not clear from the output you provided whether the model is crashing (I assume it is although you haven't said that) because of the methane model or because of the error associated with the LUNA model (Jmx25 become unrealistic).
Can you attach your cesm and lnd log files?
 
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