The CESM User's Guide gives you the details on how to setup, configure, build, and run a case. That is the document to give you the details on using the CESM scripts. The purpose of this document is to give you the details when using CESM with CLM on how to customize and use advanced features in CLM. You should be familiar with the CESM User's Guide and how to setup cases with CESM1.0.4 before referring to this document.
In this chapter we deal with three different ways of customizing a case: Choosing a compset, Customizing Configuration options, and customizing the CLM Namelist. There are many different compsets that use CLM and many are setup to enable special features of CLM from the start. So the first thing you want to be familiar with are the different options in the compsets. The next section shows the different options for customizing the configuration options for CLM. Here we introduce the CLM configure and build-namelist scripts and how using the options in env_conf.xml you can customize the configuration and the initial namelist. The final section tells you about the CLM namelist and how you can customize the namelist once you have run "configure -case" and have an initial namelist in BuildConf/clm.buildnml.csh. You can also use env_conf.xml options to change your namelist as well, before "configure -case" is run.
When setting up a new case one of the first choices to make is which "component set" (or compset) to use. The compset refers to which component models are used as well as specific settings for them. We label the different types of compsets with a different letter of the alphabet from "A" (for all data model) to "X" (for all dead model). The compsets of interest when working with CLM are the "I" compsets (which contain CLM with a data atmosphere model and a stub ocean, and stub sea-ice models), "E" and "F" compsets (which contain CLM with the active atmosphere model (CAM), prescribed sea-ice model, and a data ocean model), and "B" compsets which have all active components. Below we go into details on the "I" compsets which emphasize CLM as the only active model, and just mention the two other categories.
When working with CLM you usually want to start with a relevant "I" compset before moving to the more complex cases that involve other active model components. The "I" compsets can exercise CLM in a way that is similar to the coupled modes, but with much lower computational cost and faster turnaround times.
I_2000(I)
Active land model with QIAN atm input data for 1972-2004 and Satellite phenology (SP), CO2 level and Aerosol deposition for 2000
I_1850(I1850)
Active land model with QIAN atm input data for 1948 to 1972 and Satellite phenology (SP), CO2 level and Aerosol deposition for 1850
I_1850_CN(I1850CN)
Active land model with QIAN atm input data for 1948 to 1972 and CN (Carbon Nitrogen) biogeochemistry, CO2 level and Aerosol deposition for 1850
I_1850_SPINUP_3HrWx_CN(I1850SPINUPCN)
Active land model with BCN CPLHIST 3-hourly weather forcing data and half-hourly solar
for 1850 spinup of CN (Carbon Nitrogen) biogeochemistry, CO2 level and Aerosol deposition for 1850
I_1850-2000(I20TR)
Active land model with QIAN atm input data for 1948 to 1972 and transient Satellite phenology (SP), and Aerosol deposition from 1850 to 2000 and 2000 CO2 level
I_1850-2000_CN(I20TRCN)
Active land model with QIAN atm input data for 1948 to 1972 and transient CN, Aerosol dep from 1850 to 2000 and 2000 CO2 level
I_1948-2004(I4804)
Active land model with QIAN atm input data for 1948 to 2004 and Satellite phenology (SP), CO2 level and Aerosol deposition for 2000
I_1948-2004_CN(I4804CN)
Active land model with QIAN atm input data for 1948 to 2004 and CN (Carbon Nitrogen) biogeochemistry, CO2 level and Aerosol deposition for 2000
I_2000_CN(ICN)
Active land model with QIAN atm input data for 1972-2004 and CN (Carbon Nitrogen) biogeochemistry, CO2 level and Aerosol deposition for 2000
I_TEST_2003_CN(ICNTEST)
Test active land model with QIAN atm input data for just 2002-2003 and CN (Carbon-Nitrogen), CO2 level and Aerosol deposition for 2000 (BECAUSE OF THE SHORT FORCING PERIOD -- DO NOT USE FOR LONG SIMULATIONS)
I_2000_GLC(IG)
Active glacier model and active land model with QIAN atm input data for 1972-2004 and Satellite phenology (SP), CO2 level and Aerosol deposition for 2000
I_1850_GLC(IG1850)
Active land and glacier model with QIAN atm input data for 1948 to 1972 and Satellite phenology (SP), CO2 level and Aerosol deposition for 1850
I_1850_CN_GLC(IG1850CN)
Active land and glacier model with QIAN atm input data for 1948 to 1972 and CN (Carbon Nitrogen) biogeochemistry, CO2 level and Aerosol deposition for 1850
I_1850-2000_GLC(IG20TR)
Active land and glacier model with QIAN atm input data for 1948 to 1972 and transient Satellite phenology (SP), and Aerosol deposition from 1850 to 2000 and 2000 CO2 level
I_1850-2000_CN_GLC(IG20TRCN)
Active land and glacier model with QIAN atm input data for 1948 to 1972 and transient CN, Aerosol dep from 1850 to 2000 and 2000 CO2 level
I_2000_CN_GLC(IGCN)
Active land and glacier model with QIAN atm input data for 1972-2004 and CN (Carbon Nitrogen) biogeochemistry, CO2 level and Aerosol deposition for 2000
I_RCP2.6_CN_GLC(IGRCP26CN)
Active land and glacier model, RCP2.6 future scenario, with CN in CLM, QIAN atm input data for 1972 to 2004, 2000 CO2 level
I_RCP4.5_CN_GLC(IGRCP45CN)
Active land and glacier model, RCP4.5 future scenario, with CN in CLM, QIAN atm input data for 1972 to 2004, 2000 CO2 level
I_RCP6.0_CN_GLC(IGRCP60CN)
Active land and glacier model, RCP6.0 future scenario, with CN in CLM, QIAN atm input data for 1972 to 2004, 2000 CO2 level
I_RCP8.5_CN_GLC(IGRCP85CN)
Active land and glacier model, RCP8.5 future scenario, with CN in CLM, QIAN atm input data for 1972 to 2004, 2000 CO2 level
I_RCP2.6_CN(IRCP26CN)
Active land model, RCP2.6 future scenario, with CN in CLM, QIAN atm input data for 1972 to 2004, 2000 CO2 level
I_RCP4.5_CN(IRCP45CN)
Active land model, RCP4.5 future scenario, with CN in CLM, QIAN atm input data for 1972 to 2004, 2000 CO2 level
I_RCP6.0_CN(IRCP60CN)
Active land model, RCP6.0 future scenario, with CN in CLM, QIAN atm input data for 1972 to 2004, 2000 CO2 level
I_RCP8.5_CN(IRCP85CN)
Active land model, RCP8.5 future scenario, with CN in CLM, QIAN atm input data for 1972 to 2004, 2000 CO2 level
I_TEST_2003(ITEST)
Test active land model with QIAN atm input data for just 2002-2003 and Satellite phenology (SP), CO2 level and Aerosol deposition for 2000 (BECAUSE OF THE SHORT FORCING PERIOD -- DO NOT USE FOR LONG SIMULATIONS)
CAM compsets are compsets that start with "E" or "F" in the name. They are described more fully in the scripts documentation or the CAM documentation. "E" compsets have a slab ocean model while "F" compsets have a data ocean model.
Fully coupled compsets are compsets that start with "B" in the name. They are described more fully in the scripts documentation.
We've introduced the basic type of compsets that use CLM and given some further details for the "standalone CLM" (or "I" compsets). The config_compsets.xml lists all of the compsets and gives a full description of each of them. In the next section we look into customizing the configure time options for compsets using CLM.