CLM4.5用户指南： CESM1.2.0陆地表面模型详细教程

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CLM4.5是美国国家大气研究中心（NCAR）的社区地球系统模型（Community Earth System Model，CESM）1.2.0版本中的关键组成部分，专门用于陆地表面气候建模。这份用户手册提供了详尽的指导，旨在帮助新手和经验丰富的用户，以及CLM4的开发者充分利用这款模型进行研究。手册由Erik Kluzek编写，它在2013年6月14日更新，并可以从指定的SVN仓库获取。用户指南的主要内容包括： 1. 致谢：对Land Model Working Group表示敬意，他们曾获得2008年CCSM杰出成就奖，赞扬他们在陆地表面模型科学领域的持续合作与贡献。 2. 引言：简要介绍了CLM4.5用户手册的目的，即为了帮助用户理解并有效使用CLM4进行复杂的陆地表面气候模拟，无论是初次接触还是高级应用。 3. 重要提示与最佳实践：手册提供了一些关键的注意事项和建议，确保用户在使用过程中能够避免常见问题，优化模型性能。 4. 如何使用此文档：这部分指导读者如何阅读和导航手册，可能涉及章节结构、索引的查找以及如何找到特定主题的说明。 5. CLM4在CESM1.2.0中的新特性：与之前公开版本相比，本版本可能引入了新的模型功能、改进的算法或增强的性能。这部分详细列出了自上一版本以来的重大变化。 6. CLM4在CESM1.1.0中自2011年11月15日以来的新进展：这部分概述了针对更早版本的任何重要更新或修复。通过这份详细的用户手册，用户可以了解到CLM4.5在 CESM1.2.0中的工作原理，如何设置和配置模型参数，以及如何执行和解读模型输出的范例。无论是对气候模型有深入研究的科学家，还是寻求在项目中应用该模型的学生，这都是一个宝贵的资源。同时，对于开发者而言，它还提供了关于代码结构和开发过程的洞察，有助于进一步提升模型的定制和扩展能力。

What is new with CLM4 in CESM1.2.0 since previous public releases?

SNOWLIQ and SNOWICE changed from average to instantaneous output.

What was new with CLM4 in CESM1.0.2 (in CESM1.0.2)

since the September 17th, 2010 CESM1.0.1 release?

Since, CLM4 in CESM1.0.1 in the CESM1.0.1 release there were several developments made to CLM4

in CESM1.2.0. Several new namelist items were added a few new history ﬁelds. There were also some

updates for running the model with single-point mode.

Conﬁguration options that were renamed:

prog_seasalt => progsslt

Namelist items removed:

prog_seasalt => progsslt

What was new with CLM4 in CESM1.0.2 Science since CLM4

in CESM1.0.1?

A long simulation at the course resolution of T31 (typically used for Paleo-climate studies) was done and

an spun-up initial condition ﬁle was provided for this resolution (also by default the namelist variable

ice_runoff was turned off for T31). Also a new surface dataset and transient land-cover dataset was

provided for half-degree resolution.

What was new with CLM4 in CESM1.0.2 Software since CLM4

in CESM1.0.1?

New conﬁguration options

sitespf_pt

sitespf_pt is used for single-point/regional mode and is set to the site-name that will be used (see the

config_definition.xml for the list of valid options).

Conﬁguration options that were renamed:

prog_seasalt => progsslt

Namelist items removed:

faerdep

fndepdat

fndepdyn

use_ndepstream

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Quickstart to using CLM4.5

Before working with CLM4 read the QuickStart Guide in the CESM1.2.0 Scripts User’s Guide

(http://www.cesm.ucar.edu/models/cesm1.1/cesm). Once you are familiar with how to setup cases for

any type of simulation with CESM you will want to direct your attention to the speciﬁcs of using CLM.

For some of the details of setting up cases for CLM4 read the README and text ﬁles available from the

"models/lnd/clm/doc" directory (see the "CLM Web pages" section for a link to the list of these ﬁles).

Here are the important ones that you should be familiar with.

1. README (../README) ﬁle describing the directory structure.

2. Quickstart.userdatasets (../Quickstart.userdatasets) ﬁle describing how to use your own datasets in

the model (also see the Section called Creating your own single-point/regional surface datasets in

Chapter 5).

3. models/lnd/clm/doc/KnownBugs (../KnownBugs) ﬁle describing known problems in CLM4

(that we expect to eventually ﬁx).

4. models/lnd/clm/doc/KnownLimitationss (../KnownLimitations) ﬁle describing known

limitations in CLM4.5 and workarounds that we do NOT expect to ﬁx.

The IMPORTANT_NOTES ﬁle talks about important things for users to know about using the model

scientiﬁcally. It content is given in the next chapter on "What is scientiﬁcally validated and functional in

CLM4.5?".

The ChangeLog/ChangeSum talk about advances in different versions of CLM. The content of these ﬁles

is largely explained in the previous chapter on "What is new with CLM4 in CESM1.2.0 since previous

public releases?".

Note other directories have README ﬁles that explain different components and tools used when

running CLM and are useful in understanding how those parts of the model work and should be

consulted when using tools in those directories. For more details on conﬁguring and customizing a case

with CLM see Chapter 1.

The Quickstart.GUIDE (which can be found in models/lnd/clm/doc) is repeated here.

Quick-Start to Using cpl7 Scripts for clm4_5

============================================

Assumptions: You want to use yellowstone with clm4_5 BGC

to do a clm simulation with data atmosphere and the

latest CRUNCEP atm forcing files and settings. You also want to cycle

the CRUNCEP atm data between 1950 to 2010 and you want to run at

0.9x1.25 degree resolution.

Process:

# Create the case

cd scripts

./create_newcase -case <testcase> -mach yellowstone_intel -res f09_g16 -compset I4804

(./create_newcase -help -- to get help on the script)

# Setup the case

cd <testcase>

./xmlchange id1=val1,id2=val2 # to make changes to any settings in the env_

.xml files

./cesm_setup

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Quickstart to using CLM4.5

(./cesm_setup -help -- to get help on the script, this creates the ./<testcase>.run \

script)

# Add any namelist changes to the user_nl_

files

$EDITOR user_nl_

# Compile the code

./<testcase>.build

# Submit the run

./<testcase>.submit

Information on Compsets:

"I" compsets are the ones with clm and datm7 without ice and ocean.

Most of the "I" compsets for CLM4.0 use the CLM_QIAN data with solar following

the cosine of solar zenith angle, precipitation constant, and other

variables linear interpolated in time (and with appropriate time-stamps on

the date).

Some of the I compsets are:

Name (short-name): Description

--------------------------------------------------------------------------

I_2000 (I): CLM to simulate year=2000

I_2000_1PTFRC (I1PT): CLM to simulate year=2000 with single-point forcing

I_2000_CN (ICN): CLM to simulate year=2000 with Carbon-Nitrogen BGC \

model (CN)

I_1850 (I1850): CLM to simulate year=1850

I_1850_CN (I1850CN): CLM to simulate year=1850 with Carbon-Nitrogen BGC \

model (CN)

I_1850_SPINUP_3HrWx_CN (I1850SPINUPCN): CLM to simulate year=1850 with MOAR forcing to spinup \

Carbon-Nitrogen BGC model (CN)

I_1948_2004 (I4804): CLM running with atm data over 1948-2004

I_1850-2000 (I8520): CLM with transient PFT over 1850-2000

I_1948-2004_CN (I4804CN): CLM with CN on running with atm data over 1948-2004

I_1850-2000_CN (I20TRCN): CLM with CN on with transient PFT over 1850-2000

I_RCP2.6_CN (IRCP26CN): CLM with CN on with transient PFT over 1850-2100 for \

RCP=2.6 scenario

I_RCP4.5_CN (IRCP45CN): CLM with CN on with transient PFT over 1850-2100 for \

RCP=4.5 scenario

I_RCP6.0_CN (IRCP60CN): CLM with CN on with transient PFT over 1850-2100 for \

RCP=6.0 scenario

I_RCP8.5_CN (IRCP85CN): CLM with CN on with transient PFT over 1850-2100 for \

RCP=8.5 scenario

Automatically resubmitting jobs:

After doing a short simulation that you believe is correct

./xmlchange CONTINUE_RUN=TRUE

# Change RESUBMIT to number greater than 0, and CONTINUE_RUN to TRUE...

./<testcase>.submit

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