clm5.0 tutorial: running clm - cesm® · compset specifies the “component set” component set...

CLM5.0Tutorial:RunningCLM

Danica Lombardozzi, Keith Oleson, Erik Kluzek, Ahmed

Tawfik, Marysa Lague

NCAR is sponsored by the National Science Foundation

• CESM at a glance 1)  The CESM framework 2)  Finding information about CLM & CESM 3) Overview of CLM (and CESM) directory structure

• Basic workflow 1) Create a new case 2)  Invoke case_setup 3) Build the executable 4) Run and output data

• Changing configuration options 1) Component Sets 2) ENV files (env_[command]) 3) Namelist files (user_nl_[model])

• Getting help

• Appendix

Outline

Coupler

The Community Earth System Model (CESM) is a set of models that can be run independently or together to simulate the Earth global climate.

TheCESMFramework

TheCLMisthefocusofthisweek’stutorial

The Community Earth System Model (CESM) is a set of models that can be run independently or together to simulate the Earth global climate.

TheCESMFramework

out of the box = works immediately after installation without any modification

The CLM (and the CESM) can be run through a set of scripts provided with the model. The first part of this practical session is a quick start to the CLM workflow (out-of-the-box)

TheCLMisthefocusofthisweek’stutorial

CESM1.2WebPageh=p://www.cesm.ucar.edu/models/cesm2.0/

Model Input Data

Background and Sponsors

How to acquire the code

Reporting problems Getting Help

Release Notes Scientific validation

Post processing Tools

Model Documentation

Timing & Load Balance

ModelDocumentaFon

ModelDiagnosFcs

Post-processingTools

CLMWebPageh=p://www.cesm.ucar.edu/models/cesm1.2/clm

/glade/p/cesm/cseg/inputdata $DIN_LOC_ROOT

CESM data

/glade/p/cesm/lmwg/CLM2016_Tutorial_cesm2_0_beta01

$CCSMROOT

CESMDirectoryStructure

- CESM source code /glade/p/cesm/lmwg/CLM2016_Tutorial_cesm2_0_beta01 - CESM data /glade/p/cesm/cseg/inputdata

Code & Data directories:

Note:Todayweareusingapre-releasedversionofCESM2.0.ReleasedCESMcodeisin:/glade/p/cesm/releases

CESM Source Code

CESM data

Source code has 2 subdirectories:

- components: contains the code for every model component

- cime: contains the scripts you need to run CESM

CESM Source Code

$CCSMROOT

components cime

scripts create_newcase

cam (atmosphere)

cice (sea ice)

cism (land ice)

aquap (aquaplanet)

mosart (river routing)

pop (ocean)

rtm (river routing)

ww3 (ocean waves)

clm (land)

Note:thesubdirectoriesof“components”willchangebasedonwhetheryouareusingaCESMcodebaseoraCLMcodebase.ShownhereisthestructurefortheCESMmodelbase.ForCLM,youwillonlyfind“clm”,“mosart”or“rtm”,and“cism”subdirectories.YoucanuseeithercodebasetorunCLM-onlysimulaMons,whicharedefinedbythecomponentsetyouchoose.MoreinformaMononcomponentsetsispresentedlater.

“Inputdata" directory, $DIN_LOC_ROOT, contains all input data required to run the model

share cpl atm lnd ocn ice glc wav rof

CESM data

$CCSMROOT

components cime

cam (atmosphere)

cice (sea ice)

cism (land ice)

aquap (aquaplanet)

pop (ocean)

rtm (river routing)

ww3 (ocean waves)

clm (land)

CESM Source Code

• Getting help

• Appendix

Outline

CESM can be run in 4 steps: Work Flow: Super Quick Start

Here,youwilllearntousethesefourstepstosetupandrunasimulaMon.APercompleMngthissecMon,youwilllearnhowtomakebasicmodificaMonstothemodelconfiguraMon.

(1) create a new case (2) invoke case.setup

(3) build the executable

(4) submit your run to the batch queue

ThisstepsetsupanewsimulaMon.ItisthemostcomplicatedofthesefourstepsbecauseitinvolvesmakingchoicestosetupthemodelconfiguraMon

Thisstepconfiguresthemodelsothatitcancompile

Thisstepcompilesthemodel

ThisstepsubmitsthemodelsimulaMontothesupercomputerqueue

Open a secure shell window: Terminal, Cygwin, PuTTY, Mobaxterm

Log on using your yubikey: ssh –Y <username>@yellowstone.ucar.edu

Your screen displays a response: Token_response:

Enter your PIN number (do not hit enter), then touch the yubikey button. This will insert a new one-time password and a return

First: Logging in to Yellowstone

Note:theyubikeyisacFvatedbythewarmthofyourfinger,notthepressureofpushingthebu=on

Whenyouseethetokenresponseprompt,enteryourpinandthentouchtheyubikeybu=on.

Exercise1:Create&runanout-of-the-boxsimulaCon

Work Flow: Super Quick Start

Wewillprogressstepbystep,starMngwithstep1

Exercise1:Create&runanout-of-the-boxsimulaCon

CLMDirectoryStructure

the script you need to set up a new simulation (or create a new case)

$CCSMROOT

components cime

scripts create_newcase cism (land ice)

clm (land)

CESM Source Code

CESM data

FollowthestepsonthenextslidetosetupasimulaMon

Note:Thisweek,weareusingaCLMcodebase,whichhasfewersubdirectoriesthantheCESMcodebase.

cd into scripts directory from the source code directory: cd /glade/p/cesm/lmwg/CLM2016_Tutorial_cesm2_0_beta01/cime/scripts

Stophere./create_newcase -case ~/I1850CLM50_001 -res f19_g16 -compset IM1850CRUCLM50BGC Typethiscommandline:

Next,let’sdigintothedetailsofthiscommandtounderstandtheparts

ToDo:Exercise1:Create&runanout-of-the-boxsimulaCon

create_newcase requires 3 arguments

./create_newcase –case ~/I1850CLM50_001 –res f19_g16 –compset IM1850CRUCLM50BGC

I = CLM only, 1850

What is the casename ?

Which resolution?

Which model configuration ? Which set of components ?

In the scripts directory, create_newcase is the tool that generates a new case. Createanewcase

YourCaseName 2-degree

Note:Apreviouslyrequired4thargument,“-mach”,isnolongerneededwhenusingasupportedmachine.CIMEnowfiguresoutwhatmachineyouarerunningon.Ifyouarerunningonanunsupportedmachine,thisargumentisrequired.

create_newcasearguments3 arguments required by create_newcase:

create_newcase -case ~/I1850CLM50_001 -res f19_g16 -compset IM1850CRUCLM50BGC

create_newcasearguments

case is the location and name of the case being created ~/I1850CLM50_001 “~” = home directory, or /glade/u/home/{username} I1850CLM50_001 = case directory name

Recommendation: Use meaningful names, including model version, type of simulation, and any additional details to help you remember the configuration of this simulation Note: Steps 2-4 take place in the case directory that you create here in step 1. More on that coming up.

3 arguments required by create_newcase:

atm lnd ocn/ice river lnd mask

lnd-ice wave

res specifies the model resolutions (or grid): f19_g16 (atm/lnd_ocn/ice) Grid naming convention

Each model resolution can be specified by its alias, short name and long name.

Example of equivalent alias, short name and long name: -  alias: f19_g16 (atm/lnd_ocn/ice) -  short name: 1.9x2.5_gx1v6 -  long name = a%1.9x2.5_l%1.9x2.5_oi%gx1v6_r%r05_m%gx1v6_g%null_w%null

lnd ice ocn river lnd-ice wave time atm

compset specifies the “component set” Component set specifies component models (e.g. active vs data), forcing scenarios (e.g. 1850 vs 2000) and physics options (e.g. CLM4.5 vs CLM5.0) for those models. All CLM-only compsets start with “I”. Compset naming convention Each model compset can be specified by its alias, short name and long name. Example of equivalent alias, short name and long name:

-  alias: IM1850CRUCLM50BGC -  long name = 1850_DATM%CRU_CLM50%BGC_SICE_SOCN_MOSART_SGLC_SWAV

Land-ice wave

Plug and play

MoreonCESMcomponentsetsPlug and play of components with different component models

active data stub Color code:

KeyDefiniFons:AcCve: SimulaFonisusingthecodefromthemodelduringtherunData: SimulaFonisreadingindatafromafileforthiscomponentStub: Componentisnotbeingused

I (CLM-only)

MOSART

F (CLM-CAM)

MOSART

Inthescriptsdirectory(intheSourceCode),whereyourunthecommand“create_newcase”,youcansearchforcompsets,resoluFons(e.g.modelgrid),etc.:./manage_case-query<type>Where“type”canbe:compsets-setby<name>;component-name<name>;grids;machinesAnd“name”isthenameofaparFcularmodelcomponent,likeclm,cam,datm,etc.Forexample:./manage_case-querycompsets-setbyclmWilllistallthe“I”compsetsavailableForaddiConalhelpandopCons:./manage_case-help

MoreInformaFon&Helpcreate_newcase:

Note:InthereleasedversionofCLM5.0,thesyntaxwillchangeto“./manage_case--query-<type>”(e.g.,./manage_case--query-grids).See./manage_case--helpforallopMons.

MoreInformaFon&Helpcreate_newcase:

AlistofvalidvaluesisalsoavailableontheCESMwebsite:

h=p://www.cesm.ucar.edu/models/cesm2.0/

./create_newcase -case ~/I1850CLM50_001 -res f19_g16 -compset IM1850CRUCLM50BGC Thiscommandlinecreatesacasedirectorywiththecasenameyouspecified.Let’sexplorethatdirectorystructure.

Exercise1:Create&runanout-of-the-boxsimulaConcd into scripts directory from the source code directory: cd /glade/p/cesm/lmwg/CLM2016_Tutorial_cesm2_0_beta01/cime/scripts

$CCSMROOT

components cime

CESM Source Code

~/I1850CLM50_001 $CASEROOT

case.setup env_*xml

xmlchange

SourceMods

CASE Directory

LockedFiles

Buildconf

CESM data

create_newcase creates case directory that contains:

case_setup: script used in the next step

files with xml variables used by CESM scripts

script to edit env_*xml files

subdirectory for case-specific code modifications

cism (land ice)

clm (land)

./create_newcase -case ~/I1850CLM50_001 -res f19_g16 -compset IM1850CRUCLM50BGC

Usingthiscommandline,wejustsetupanewsimulaMonandcreatedthecasedirectory.

Nowwe’llconfigurethecaseyoujustsetup.

cd into case directory: cd ~/I1850CLM50_001 Type this command line: ./case.setup Stophere

Starthere

$CCSMROOT

components cime

CESM Source Code

~/I1850CLM50_001

case.setup case.build

case.submit user_nl_xxx

SourceMods

CASE Directory

LockedFiles

Buildconf

CESM data

case.setup creates:

case scripts (to compile, run, and archive)

namelist modification files user_nl_xxx Note:theuser_nl_xxx,or“namelist”,filesarewhereyoucanchangemodelopFonsandinputdata

CaseDocs CaseDocs: directory that contains copies of the namelists This is for reference only and files in this directory SHOULD NOT BE EDITED.

cism (land ice)

clm (land)

cd into case directory: cd ~/I1850CLM50_001 ./case.setup Usingthiscommandline,wejustconfiguredthemodelandcreatedthefilestomodifyopMons&inputdata.

cd into case directory: cd ~/I1850CLM50_001 ./case.setup

Next,wewillcompilethemodelcode

Stophere

Starthere

Type this command line: ./case.build

CaseDocs

$CCSMROOT

components cime

CESM Source Code

~/I1850CLM50_001

SourceMods

CASE Directory

LockedFiles

Buildconf

CESM data

run $RUNDIR

/glade/scratch/userx/ I1850CLM50_001

$EXEROOT

Build/Run Directory

Thecase.buildscript:1)  Checksinputdata2)  Createsabuild/

rundirectorywithmodelexecutableandnamelists

Note:Ifaninputdataismissing,buildabortsandprovidesalistofmissingfiles.

cism (land ice)

clm (land)

Usingthiscommandline,wejustcompiledthemodelandcreatedarundirectorywithmodelexecutables.

We’reonthelaststep!WewillsubmitthesimulaMontothesupercomputerqueue

Starthere

Type this command line: ./case.submit

[dll@yslogin5~/I1850CLM50_001]$ bjobs JOBID USER 192822 dll

STAT QUEUE PEND regular

When you submit a job, you will see confirmation that it successfully submitted:

FROM_HOST EXEC_HOST JOB_NAME SUBMIT_TIME yslogin3-ib *M50_001.run Sep 6 08:34

Your job is waiting in the queue

Your job is running

Submit and Check Job Status

Checkingjobs:a.  Typebjobs orb.  Typebjobs---ualltoseeeveryone’sjobs

Killingjobs:a.  FindyourJobIDa`ertypingbjobsb.  Typebkill<JobID>

Job ID

Yourjobwassubmi=edtotheregularqueue(“q”).WallclockFme(“W”)andprojectnumber(“P”)arealsospecified

CaseDocs

$CCSMROOT

components cime

CESM Source Code

~/I1850CLM50_001

SourceMods

CASE Directory

LockedFiles

Buildconf

CESM data

run $RUNDIR

$EXEROOT

Build/Run Directory

When running, the model scripts write files into your run directory.

cism (land ice)

clm (land)

CaseDocs

$CCSMROOT

components cime

CESM Source Code

~/I1850CLM50_001

SourceMods

CASE Directory

LockedFiles

Buildconf

CESM data

run $RUNDIR

$EXEROOT

Build/Run Directory

When complete, a short-term archive directory is created, and history and log files are moved here. Files necessary to continue the run are left in $RUNDIR

/glade/scratch/userx/ archive/I1850CLM50_001 $DOUT_S_ROOT

Short Term Archive

cism (land ice)

clm (land)

UpNext:MakingchangestoCLMconfiguraFonopFons

• Getting help

• Appendix

Outline

Review: The 4 commands to run CLM

CaseDocs

Review:CLMDirectories&Commands

$CCSMROOT

components cime

CESM Source Code

~/I1850CLM50_001

SourceMods

CASE Directory

LockedFiles

Buildconf

CESM data

run $RUNDIR

$EXEROOT

Build/Run Directory

(2)(3)(4)

cism (land ice)

clm (land)

On Yellowstone Checkingjobs:

a.  Typebjobs orb.  Typebjobs---ualltoseeeveryone’sjobs, or

Killingjobs:

a.  FindyourJOBIDa`ertypingbjobsb.  Typebkill<JOBID>

Review:QueuesandJobs

FindingmodeloutputDirectory:/glade/scratch/{userXX}/archive/I850CLM50_001/lnd/hist

Change this to your user name

Directory:/glade/scratch/{userXX}/archive/I850CLM50_001/lnd/hist Files(use“ls”tolistthem):

I1850CLM50_001.h0.0001-12.nc

Case Name Time

Output Type (history)

File Type (netCDF)

Change this to your user name

Findingmodeloutput

3TypesofBasicModificaFons

1.  ComponentSets

2.  ENVfiles(env_[command])

3.  Namelistfiles(user_nl_[model])

1.  ComponentSetsSet up a simulation for 2000

Which resolution?

Createanewcase

I1850CLM50_001 IM1850CRUCLM50BGC (I = CLM only, 1850)

f19_g16 (2-degree) Youused:

Thecommandline:

Which resolution?

Createanewcase

I1850CLM50_001 IM1850CRUCLM50BGC (I = CLM only, 1850)

f19_g16 (2-degree)

Nowwe’llchangethecompset

ChangingSimulaFonComponentsCompset,orcomponentset:predefinedopFonsforrunningthemodel

UsecompsettochangethetypeofsimulaFon

Changingcompsetsletsyourundifferentexperiments

Some component options: •  Year (1850, 2000, transient, etc.) •  Data atmosphere (GSWP3, CRUNCEP, CPLHIST3HrWx) •  Model options (SP [satellite phenology], BGC

[biogeochemistry]) •  RCP scenarios

Changingcompsetsletsyourundifferentexperiments

Some component options: •  Year (1850, 2000, transient, etc.) •  Data atmosphere (GSWP3, CRUNCEP, CPLHIST3HrWx) •  Model options (SP [satellite phenology], BGC

[biogeochemistry]) •  RCP scenarios

Examples of simulations using different compsets: •  Stabilize (“spin up”) a biogeochemsitry (includes N & C cycles) simulation for 1850

•  Run a transient historical simulation from 1850-2000 based on the 1850 spin up

•  Run a transient future simulation from 2000 through 2100 using RCP8.5

•  Run a “time slice” simulation for 2000

Wheretofindalistofcompsets:http://www.cesm.ucar.edu/models/cesm1.2/cesm/doc/modelnl/compsets.html Website lists ALL compsets for released CESM. CLM only = “I” compsets

In CESM scripts directory, can run: ./manage_case-querycompsets-setbyclm

Tip: Add “ | more” at the end of the command line, then use the spacebar to scroll through the options

$CCSMROOT

components cime

CESM Source Code

./create_newcase –case ~/I2000CLM50_001 –res f19_g16 –compset IMCRUCLM50BGC

Which resolution?

Exercise2:Create&buildsimulaConfor2000

I2000CLM50_001 IMCRUCLM50BGC (I = CLM only, 2000)

f19_g16 (2-degree)

./create_newcase -case ~/I2000CLM50_001 -res f19_g16 -compset IMCRUCLM50BGC

StopHere

Exercise2:Create&buildsimulaConfor2000

1.  ComponentSets

2.  ENVfiles(env_[command].xml)Changing the length of the run

Exercise3:ChangethelengthofsimulatedCme

Change the run length BEFORE submitting

Two methods of changing the run length. Method1usesthe“xmlchange"scriptandisthepreferredmethod

Usewhenmodifying“xml”files(e.g.env_run.xml)1.  Benefit:Won’tletyoumessupthesyntax!2.  Forhelp,type./xmlchange-help3.  Use“./xmlquerylist”tolistallvariablesandtheirvaluesinallthe.xmlfiles Example:ediFngenv_run.xmlviathexmlchangetool./xmlchange{variabletobechanged}={valuetochangeto}

* We won’t use xml commands right now, but you will during the next section.

HowTo:ChangethelengthofsimulatedCme

Method 2 edits the scripts directly and involves two steps:

1)  Modify env_run.xml to set desired simulated length (STOP_N and STOP_OPTION)

2)  Modify env_batch.xml to tell computer how much computer time is needed to complete the simulation (JOB_WALLCLOCK_TIME)

When modifying files, use an editor of your choice

Examples: Emacs nedit vi

HowTo:ChangethelengthofsimulatedCme

In a text editor*, open env_run.xml

* If you don’t have a preferred editor, emacs is user friendly. Type “emacs env_run.xml” (or “emacs anyfilename”)

1)Modifyenv_run.xmltosetdesiredsimulatedlength

CaseDocs

~/I1850CLM50_001

env_xxx

SourceMods

CASE Directory

LockedFiles

Buildconf

env_run.xmlscriptThisisthebeginningoftheenv_run.xmlscript:

RunFmevariablescanbechangedinenv_run.xmlatanypointandcontrolthemechanicsoftherun(length,resubmits,andarchiving).

Commonvariablestochangeinclude:

1.  STOP_OPTIONà setstherunFmeintervaltype,i.e.nmonths,ndays,nyears

2.  STOP_Nà setsthenumberofintervalstorunthemodelduringthespecifiedwallclock*Fme.

*WallclockFmeissetintheenv_batch.xmlfileandisameasureoftheactualFme.

3.   RESUBMITà setsthenumberofFmestoresubmittherun

Scrollthroughthescripttofindthesevariables

env_run.xmlscript

Exercise3(Part1):RunsimulaFonfor5years

1.   STOP_OPTIONà changeto“nyears”

2.   STOP_Nà changeto“5”

3.   RESUBMITà setsthenumberofFmestoresubmittherunWewon’tuse“resubmit”rightnow.Hereisanexampleforhowtorun5yearsusingtheresubmitopMon:STOP_N=1RESUBMIT=4**Thiswillrun5differentsimulaMonsfor1yeareach**

TODO:Intheenv_run.xmlscriptinyourI2000CLM50_001case,change:

Usingatexteditor,openenv_batch.xml

Exercise 3 (Part 2): Modify env_batch.xml to tell computer how much computer time is needed to complete the simulation (Wall Clock Time)

env_batch.xmlscript

CaseDocs

SourceMods

CASE Directory

LockedFiles

Buildconf

~/I1850CLM50_001

env_xxx

env_batch.xmlscript

1)queuetype(also:economy,premium,etc.)

2)wallclockFmerequested*

3)projectnumber

CommonVariablestochange:

Makesurethatchangesareinthejob“run”,atthetopofthescript.Youcanalsomakechangestotheshort-termandlong-termarchivesubmissionscriptshere.

*Note:MaximumallowablewallclockMmeonYellowstoneis12hours.SubmissionsrequesMnglessMmetypicallyhaveshorterwaitMmesinthequeue.

Exercise3(Part):ChangewallclockFme

changeJOB_WALLCLOCK_TIME to“2:00”

TODO:Intheenv_batch.xmlscriptinyourI2000CLM50_001case,change:

A`ermodifyingenv_run.xmlandenv_batch.xml,StartHere

1.  ComponentSets

3.  Namelistfiles(user_nl_[model])*GoingbacktoI1850CLM50_001case,changingdatarecordfrequency

Exercise4:Changingdatarecordfrequency

This is when you modify the namelists.

$CCSMROOT

components cime

CESM Source Code

run $RUNDIR

datm_in drv_flds_in drv_in lnd_in mosart_in

$EXEROOT

Build/Run Directory

~/I1850CLM50_001

case.setup user_nl_datm user_nl_clm user_nl_cpl

user_nl_mosart

case.build case.submit

SourceMods

CASE Directory

Case Docs datm_in drv_flds_in drv_in lnd_in mosart_in

LockedFiles

Buildconf

(3)(4)

cism (land ice)

clm (land)

$CCSMROOT

components cime

CESM Source Code

SourceMods

CASE Directory

LockedFiles

Buildconf

$EXEROOT

Build/Run Directory

(1)(2)

(3)(4)

case_setup creates namelist modification files user_nl_xxx. This is where namelist files are modified

run $RUNDIR

~/I1850CLM50_001

user_nl_mosart

cism (land ice)

clm (land)

$CCSMROOT

components cime

CESM Source Code

SourceMods

CASE Directory

LockedFiles

Buildconf

(1)(2)

(3)(4)

$EXEROOT

Build/Run Directory

The build script creates namelists in the run directory

run $RUNDIR

~/I1850CLM50_001

user_nl_mosart

cism (land ice)

clm (land)

$CCSMROOT

components cime

CESM Source Code

SourceMods

CASE Directory

LockedFiles

Buildconf

(1)(2)

(3)(4)

$EXEROOT

Build/Run Directory

The build script creates namelists in the run directory

CaseDocs contains copies of the namelists for reference only (should not be edited)

run $RUNDIR

~/I1850CLM50_001

user_nl_mosart

cism (land ice)

clm (land)

• Not all changes can be made in env_run.xml.

• user_nl_<model> files appear in the case directory after ./case.setup is invoked:

user_nl_datm atmosphere (atm_in)

user_nl_clm land (lnd_in)

user_nl_cpl coupler (driver; drv_in) user_nl_mosart river transport (mosart_in)

• Compsets set up namelists • user_nl_clm modifies lnd_in name list file

Important: Don’t modify the namelist file directly. Make changes in user_nl_clm.

ModifyingNamelists

• Compsets set up namelists • user_nl_clm modifies lnd_in name list file

Important: Don’t modify the namelist file directly. Make changes in user_nl_clm.

ModifyingNamelists

•  Website for CLM namelist variables: http://www.cesm.ucar.edu/models/cesm1.1/cesm/doc/modelnl/nl_clm.html

** Some namelist variables can also be changed in env_run.xml file

LookingatNamelistFiles

Option 1 •  cdintoyourcasedirectory,thenCaseDocs

• (~/I1850CLM50_001/CaseDocs)

•  Openlnd_inwithtexteditorOption 2 •  cdintoyourrundirectory

•  (glade/scratch/I1850CLM50_001/run)

•  Openlnd_inwithtexteditorOpenthelnd_infileusingoneoftheseopMons

Note:ThesefilestelltheinputdatasetsandmodelopMonsthatyoursimulaMonissetuptouse.Donotchangethesefilesdirectly.Ifchangesarenecessary,modifytheuser_nl_xxxfiles.

Beginningofthelnd_infile

FilewithiniFalcondiFons

Filewithsurfacedataset

Differentcompsetswillchangethestatusofsomeofthesethings.

ExampleModificaFon:user_nl_clm

hist_mfilt:NumberofsampleswithinafileDefaultis1Setngvalueto12wouldput12recordsintoasinglefile

Changingthefrequencyofmodeloutput

ExampleModificaFon:user_nl_clm

hist_mfilt:NumberofsampleswithinafileDefaultis1Setngvalueto12wouldput12recordsintoasinglefile

Changingthefrequencyofmodeloutput

hist_nhurq:Frequencythatdataarerecordedandwri=entoafileDefault:0meansthatoutputisrecordedeverymonth(monthlyaverages)PosiCveValues:NumberofmodelFmesteps(half---hourly)foroutputrecord

ex:48meansoutputisrecordedeveryday(dailyaverages)

NegaCveValues:Absolutevalueinhoursforoutputrecordex:---1meansoutputisrecordedhourly;---24meansoutputisrecordeddaily

* Both hist_mfilt & hist_nhtfrq must be integers

hist_mfilt =365=-24

Monthlyoutputwitheachmonthwri=entoaseparatefile(default,asinI2000CLM50_001case):hist_mfilthist_nhurq

ExampleModificaFon:user_nl_clmChanging the frequency of model output

Dailyoutputwithayearsworthofdailyrecordsinafile:

hist_nhurq

Example4:Modifyuser_nl_clmtogetmonthlyoutput,1filepermonthinI1850CLM50_001

For this tutorial, we changed the default data record setting to daily in the I1850CLM50 compset.

Example4:Modifyuser_nl_clmtogetmonthlyoutput,1filepermonthinI1850CLM50_001

For this tutorial, we changed the default data record setting to daily in the I1850CLM50 compset.

hist_mfilthist_nhurq

Inuser_nl_clm,add:

Then,runI1850CLM50_001for5years.Todothis:

1.  Changeuser_nl_clmtorecordmonthlyoutput

2.  ChangeSTOP_OPTIONandSTOP_Nvariablesinenv_run.xml

3.  ChangewallclockFmeinenv_batch.xml4.  RerunthesimulaFon:case.submit

Usewhatyoulearnedfromthepreviousexamplestomakethesechanges

After modifying the namelists, Start Here

Note:Thecase.submitscriptwillautomaMcallyupdateandcheckthenamelists.Ifyouwanttoupdateandcheckyournamelistsbeforesubmilng,youcanalsorunthe“preview_namelists”script.

NowYOUknowhowtoruntheCLM!

Use these 3 basic modifications to run a variety of simulations.

1.  ComponentSets2.  ENVfiles(env_[command])3.  Namelistfiles(user_nl_[model])

DocumenCngYourChanges:READMEfilesInyourcasedirectory,youwillfindautomaFcallygenerated

documentaFonfiles. README.casefile:detailedinformaFononyourcompsetandresoluFon,includingwhetheryourconfiguraFonhassciencesupport. Best Practice: In the README.case file, we highly recommend YOU document any changes you make to the default scripts. It is YOUR paper trail and opportunity to list modifications.

Exercises:TestYourKnowledge

1)  Setupa2-degreeCLM5.0-BGCsimulaFonfor2000andrunfor1monthwithdailyhistoryfiles.

2)  Setupa2-degreeCLM5.0-BGChistoricalsimulaFonandrunfor5yearswithmonthlyhistoryfiles

3)  Setupa1-degreeCLM5.0-BGC1850simulaFonandrunfor1yearwithmonthlyhistoryfiles

ForaddiFonalinformaFononrunning&configuringCLM,seeCLMUser’sGuide

CLM User’s Guide:

http://www.cesm.ucar.edu/models/cesm1.2/clm/models/lnd/clm/doc/UsersGuide/book1.html

For help with other parts of the CESM: http://www.cesm.ucar.edu/models/cesm2.0/

Note:TheCLM5.0User’sGuideiscurrentlyaworkinprogress.LookforthenewversionwiththeCESM2.0release

Getting Help CESMBulleFnBoard:h=p://bb.cgd.ucar.edu/

Appendix

• Registration • Download the source code • Hardware/software requirements

(A)RegistraFon•  Go to CESM2.0 home page: http://www.cesm.ucar.edu/models/cesm2.0/

•  Right hand column has a link to the registration page, click on it

•  Register -- you will be emailed a username and password

(B)DownloadtheSourceCode

• List the versions available on the CESM repository svn list https://svn-ccsm-release.cgd.ucar.edu/model_versions

• Check out a working copy from the repository (“Download code”) svn co https://svn-ccsm-release.cgd.ucar.edu/model_versions/cesm2_0

• Code and input datasets are in a subversion repository (*) https://svn-ccsm-release.cgd.ucar.edu/model_versions

(*) You can get subversion at http://subversion.apache.org/

Repository

model versions

cesm1_1

cesm2_0

Note:onlyavailableuponCESM2.0release,esMmatedDecember2016

(C)Hardware/So`wareRequirements

• Running CESM on other platforms Require porting + software - Subversion client (version 1.4.2 or greater) - Fortran and C compilers (recommend pgi, intel, or ibm xlf compilers) - NetCDF library (recommend netcdf4.1.3 or later) - MPI (MPI1 is adequate, Open MPI or MPICH seem to work on Linux clusters)

• Supported platforms CESM currently runs “out of the box” today on the following machines - yellowstone – NCAR IBM -  titan – ORNL Cray XK6 - hopper – NERSC Cray XE6 - edison – NERSC Cray Cascade - bluewaters – ORNL Cray XE6 -  intrepid – ANL IBM Bluegene/P - mira – ANL IBM Bluegene/Q -  janus – Univ Colorado HPC cluster - pleiades – NASA SGI ICE cluster - and a few others

out of the box = works immediately after installation without any modification

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