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Inquiry about CLM surface data files

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ryanwu

Ryan Wu
New Member
Hello,
I am a beginner in CLM and CESM. I would like to conduct global-scale simulations using the CLM model with dynamic vegetation but I got a few questions listed below. Any comments are highly appreciated!
(1) I want to drive the CLM model with atmospheric forcing data and then investigate the changes in plant function types (PFT) over time. At this moment, I am using the compset of "ICLM45BGCDVCROP" from the website of CESM Component Models Namelist Definitions . Could you please tell me whether this compset is a good fit for my aim?
(2) As I am going to perform additional analysis with PFTs, another model requires 16 PFTs outputs from CLM-DGVM runs. However, once I finished the CLM simulations with the default surface dataset (which is surfdata_1.9x2.5_mp24_simyr2000_c130419.nc), there are 25 PFTs in the h0 output. Then I dig out the path CESMdata/inputdata/lnd/clm2/surfdata_map/ and find the file "surfdata_1.9x2.5_hist_16pfts_Irrig_CMIP6_simyr2000_c190304.nc" which corresponds to 16 PFTs. Would this surface data file be well-suited for my runs over the period from 2000 to 2010?
(3) Upon investigation, I guess the most well-suited surface data file should be generated from Vegetation_type_raw_data_filename =mksrf_landuse_rc2000_c110913.nc. However, I was not able to locate the corresponding surface data file in CESMdata/inputdata/lnd/clm2/surfdata_map/ path. Could you please guide me to the right file if there is a global surface file existed with base PFTs from mksrf_landuse_rc2000_c110913.nc?
(4) I would like to drive the CLM with dynamic vegetation between 2000 and 2010, and now I set the start time of CLM as 2000-01-01 rather than 0000-01-01. Is it correct? Do I need to spin up the CLM model for several years (100 years or even more?)?

Thanks!

Cheers,
Ryan
 
O

oleson

Keith Oleson
CSEG and Liaisons
Staff member
Unfortunately, dynamic vegetation is not supported, we don't have any expertise in-house anymore.
Since you are a new user, I would recommend looking at this discussion post about tutorial opportunities for CTSM/CLM:

github.com

Tutorial opportunities for CTSM · ESCOMP CTSM · Discussion #1855

We've received a number of requests to launch the cloud environment from the CTSM mini-tutorial. This cloud environment has been taken down, but there are still ways to learn about CTSM. Here are s...
github.com github.com

Feel free to post there if you have questions about tutorials.
 
R

ryanwu

Ryan Wu
New Member
oleson said:
Unfortunately, dynamic vegetation is not supported, we don't have any expertise in-house anymore.
Since you are a new user, I would recommend looking at this discussion post about tutorial opportunities for CTSM/CLM:

github.com

Tutorial opportunities for CTSM · ESCOMP CTSM · Discussion #1855

We've received a number of requests to launch the cloud environment from the CTSM mini-tutorial. This cloud environment has been taken down, but there are still ways to learn about CTSM. Here are s...
github.com github.com

Feel free to post there if you have questions about tutorials.
Click to expand...
Hi Dr.Oleson,
Thanks a lot for your timely reply. Would you mind sharing your insights on Q3 and Q4 with us?
Q3: Do we have any surface data file generated from Vegetation_type_raw_data_filename =mksrf_landuse_rc2000_c110913.nc? I didn't find any surface data file for mksrf_landuse_rc2000_c110913.nc in CESMdata/inputdata/lnd/clm2/surfdata_map/ path. Could you please guide me to the right file if there is a global surface file existed with base PFTs from mksrf_landuse_rc2000_c110913.nc?
Q4: I would like to drive the CLM without dynamic vegetation between 2000 and 2010, and now I set the start time of CLM as 2000-01-01 rather than 0000-01-01. Is it correct? Do I need to spin up the CLM model for several years (100 years or even more?)?

Best,
Ryan
 
O

oleson

Keith Oleson
CSEG and Liaisons
Staff member
Q3. I'm not aware of any surface data generated from that raw data. It is so old I wouldn't know how to determine that.
Q4. There are a number of I2000 compsets (land-only) that may be suitable for your use. You can query available compsets from cime/scripts using:
./query_config --compsets clm. These compsets should have spunup initial conditions available and yes you can set the start time to 2000-01-01. The atmospheric forcing will vary by year, however, other forcings will be circa-2000 (pfts, co2, nitrogen deposition, etc.). If you want a more transient simulation, then the IHist compsets are recommended.
 
R

ryanwu

Ryan Wu
New Member
oleson said:
Q3. I'm not aware of any surface data generated from that raw data. It is so old I wouldn't know how to determine that.
Q4. There are a number of I2000 compsets (land-only) that may be suitable for your use. You can query available compsets from cime/scripts using:
./query_config --compsets clm. These compsets should have spunup initial conditions available and yes you can set the start time to 2000-01-01. The atmospheric forcing will vary by year, however, other forcings will be circa-2000 (pfts, co2, nitrogen deposition, etc.). If you want a more transient simulation, then the IHist compsets are recommended.
Click to expand...
Hi Dr.Oleson,
I have a follow-up question regarding the number of PFTs in CLM. There are several PFTs in each surface data file. For example, some have 16 PFTs while some have 24 PFTs. Could you please tell me where I can find a Table that lists each PFT for these files? For example, what is the PFT corresponding to 1, 2, 3, 4 in the 24 PFTs (It is easy to find the 16 PFTs while hard to locate for 24 PFTs)?
Thanks!
 
R

ryanwu

Ryan Wu
New Member
oleson said:
For CLM5, you can find a pft table in the technical note:


The datasets that have 24 pfts are likely from an older version of CLM that had an experimental crop model. You can find a list of these in the CLM4.5 technical note:

Click to expand...
I did search the CLM4.5 technique note file and I guess you are referring to the Table 3.1. Plant functional type optical properties. Am I right?
Thanks!
 
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