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The Community Earth System Model (CESM) is a fully coupled, global climate model that provides state-of-the-art computer simulations of the Earth's past, present, and future climate states.

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35
83 change output precision
by jedwards
December 16, 2015 - 7:09am
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Community Bug Reporting
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650 Reducing time step causes CAM5.3 to equilibrate at TOM ~1 W/m2
by jsbj@...
February 3, 2016 - 12:06pm
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28 Has anyone run CVDP for the CESM LE control simulation?
by fyke@...
September 8, 2015 - 12:53pm
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Includes requests for new features and configuration inquiries
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1669 errpr while running cesm1.2.2 with megan
by tilmes
3 hours 27 min ago
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This forum is for the discussion of git issues in the CIME repository
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16 svn external for a given git tag
by andre
May 6, 2015 - 4:04pm
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227
594 Adjusting SEA ICE for changes in SST
by prashantdconqrr@...
January 27, 2016 - 5:50am
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Posted and Moderated by CSEG only
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0 n/a
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CESM MIP simulations, including CMIP5
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49 The available data period for CMIP5 decadal run
by strandwg
October 27, 2015 - 7:13am
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2
3 Improving search in DiscussCESM forum by using tags
by manojkc
September 1, 2015 - 1:27am
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141
359 [Solved] CESM precip extremes far larger than WRF precip extremes and observations (PRECTMX)
by aerler@...
January 20, 2016 - 7:33am
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Tips and tricks for getting the best performance from CESM
13
17 How many cores make CAM5-SE faster than CAM5-FV
by oyvind.seland@...
January 11, 2016 - 3:20am
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5
5 Issues With Porting Guide
by heavens
October 29, 2015 - 5:03am
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11 FIDEAL
by jihwang@...
October 21, 2015 - 1:31pm
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Includes issues for building/running on supported machines and porting to unsupported machines
289
1093 running cesm1.2.0 on mac using mpich: Fatal error in MPI_Allgatherv
by potmomus@...
February 3, 2016 - 1:50pm
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Forum for issues related to the new version control system
14
32 How to generate list of changes committed to a branch for inclusion in ChangeLog file?
by sacks
November 12, 2014 - 8:08pm
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A place for questions about the ESMF mapping tools and the cprnc tool as well as any topics related to grid generation.
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40 runoff_map tool error in cesm1_4_beta04
by fyke@...
September 4, 2015 - 4:06pm
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For discussion regarding the web based modeling tutorials
7
21 Basic B_1850 Compilation
by hannay
June 23, 2014 - 10:13am
 

CESM software is based on a framework, which divides the complete climate system into component models connected by a flux coupler.

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4
5 Running CLM4.5 with CAM5 at higher resolution
by rosh.me91@...
January 27, 2016 - 5:15am
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29
87 CESM1_2_2 running issues of the beginner
by holthaum@...
January 21, 2016 - 4:08am
 

The Community Atmosphere Model (CAM) is the atmosphere model component of the CESM. Information about running CAM as the atmospheric component of the CESM is found in the CESM release documentation. For information on CAM microphysics, visit the CAM Microphysics Development Group. Please see the Whole Atmosphere Community Climate Model Forum and the Climate Chemistry Forum for topic discussions specific to these capabilities of CAM.

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17
71 NCEP MAM and SON in AMWG diagnostics observational data download
by eroesler@...
December 4, 2015 - 10:33am
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28
85 How to calculate A, B hybrid pressure coefficients for CAM?
by h.parish@...
December 28, 2015 - 12:27pm
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forum now closed - existing threads will eventually be moved to their appropriate forums
238
587 WACCM with pop2 and prescribed chemistry
by hspark1@...
November 11, 2015 - 12:25am
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23
53 aerosol optical depth
by aditya.nalam@...
January 7, 2016 - 6:02am
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64
191 Modifying parameters in source code to be passed through namelist
by eaton
January 29, 2016 - 7:20am
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47
163 bndtvs (changing SST boundary conditions)
by hspark1@...
January 10, 2016 - 6:57pm
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494 trouble with build of runs
by ashields@...
January 19, 2016 - 3:20pm
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192
762 simulation hangs after "opened existing file" <bnd_topo file>
by mvparke@...
January 18, 2016 - 3:54pm
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113
316 CAM5 MG1.0 liquid and ice number concentrations much smaller than in evaluation paper
by andrew
November 2, 2015 - 8:33am
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42
96 SCAM netcdf pio crash
by jet
November 20, 2015 - 3:54pm
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126
377 Vertical Levels for GEOS5 Meteorology - Does it need to match -nlev?
by tilmes
January 12, 2016 - 12:40pm
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94
276 zonal moisture transport
by wangh.11s@...
January 12, 2016 - 9:36pm
 

The Whole Atmosphere Community Climate Model (WACCM) is a comprehensive numerical model, spanning the range of altitude from the Earth's surface to the thermosphere.

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23
43 Bug in "unofficial" versions of WACCM
by santos
August 24, 2015 - 1:22pm
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107
520 Question about running aquaplanet with WACCM
by xiaxin@...
January 14, 2016 - 7:16am
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49
247 Sulphate PURSUL size bins
by thibaut.lurton@...
December 14, 2015 - 4:38am
 

The goal of the Chemistry-Climate WG is to continue the development of the representation of chemical gas and aerosol species in the CESM and to further our understanding of the interactions between chemistry/aerosol and climate.

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General Announcements for the Chemistry Climate Working Group Forum
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16 non-existent of input data
by holthaum@...
January 21, 2016 - 5:38am
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Science Issues for The Chemistry Climate Working Group
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3 SOA simulation in CAM5
by pawanvats5086@...
October 26, 2015 - 12:19am
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Software and Run-time issues for the Chemistry Climate Working Group
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8 necessity of cold start
by chakravorty.ani...
January 28, 2016 - 12:28am
 

The Community Land Model (CLM) is the land model for the Community Earth System Model (CESM). It is a collaborative project between scientists in the Terrestrial Sciences Section (TSS) and the Climate and Global Dynamics Division (CGD) at the National Center for Atmospheric Research (NCAR) and the CESM Land Model and Biogeochemistry Working Groups. Other principal working groups that contribute to the CLM are the Chemistry-Climate, Paleoclimate, Climate Variability and Change, and Land Ice Working Groups.

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2
4 Detailed guide for lnd_diag for creating non-standard variable lists from daily history lnd output files
by oleson
September 14, 2015 - 2:44pm
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32
87 Creat my own transient surfdata CLM4.5
by pengxiaoqing1987@...
December 3, 2015 - 9:48am
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78
182 running CLM 4.5 at higher resolution
by rosh.me91@...
January 27, 2016 - 5:14am
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268
870 run time issue for CLM45BGC
by oleson
1 day 5 hours ago
 

The Land Ice Working Group (LIWG) was formed to develop and apply the ice sheet model component of CESM and to assess the role of land ice in climate change and sea-level rise.

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CISM General Announcements
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CISM Science Issues
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2 LGM initial and config files
by fyke@...
November 20, 2014 - 6:54am
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CISM Software and Run-time issues
4
25 Changing Greenland ice sheet topography?
by fyke@...
January 13, 2016 - 10:02am
 

Support of specific science objectives of the CESM and maintaining a state-of-the-art ocean component for the CESM as well as conducting related, but curiosity-driven, research leading to new contributions to the CESM community are the primary goals of the Ocean Model Working Group (OMWG). The former goals ensure that our working group, through CESM, fully contributes to science. The latter is absolutely necessary to keep the CESM at the leading edge of ocean climate models. This, of course, requires a continuous high level of effort and support. Information on the new ocean model component of the CESM can be found at http://www.cesm.ucar.edu/models/cesm1.0/pop2/.

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12
25 question about 'za' unrecognized argument -grid_file
by hucq14@...
September 21, 2015 - 8:42pm
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6
8 new POP2 FAQ
by njn01
October 10, 2013 - 10:04am
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32
80 Attempting parallelization in ocean, need help in science
by aketh.tm@...
January 8, 2016 - 6:30am
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40
115 problem about setting of RUN_STARTDATE in compsete CIAF for running from a particular year
by yaozhixiong@...
December 10, 2015 - 6:15am
 

CICE4 is the latest version of the Los Alamos Sea Ice Model, sometimes referred to as the Community Ice CodE. It is the result of a community effort to develop a portable, efficient sea ice model that can be run coupled in a global climate model or uncoupled as a stand-alone ice model. It has been released as the sea ice component of the Community Earth System Model (CESM), a fully-coupled global climate model that provides simulations of the earths past, present and future climate states. CICE4 is supported on high- and low-resolution Greenland Pole and tripole grids, which are identical to those used by the Parallel Ocean Program (POP) ocean model. The high resolution version is best suited for simulating present-day and future climate scenarios while the low resolution option is used for paleoclimate simulations and debugging.

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3
7 What aerosol species does CICE use?
by wenshanw@...
November 11, 2015 - 4:35pm
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3
4 FAQ: Albedo/Radiation Tuning in CESM-CICE
by dbailey
April 28, 2014 - 10:24am
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13
44 CICE Prescribed Mode Ice Thickness
by mg3662@...
February 4, 2016 - 4:01pm
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20
82 CICE monotonicity error
by pdn@...
July 22, 2015 - 8:40pm
 

Biogeochemistry, modeled in the CESM land model (CLM), and refers to the cycling of carbon and nitrogen through the plant / soil system and the interactions between these cycles as mediated by biological mechanisms of plants and soil heterotrophs.

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2
2 restart in ecosystem model
by jjakacki@...
May 25, 2011 - 5:23am
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3
10 atmospheric CO2 used by radiative and by biogeochemical flux computations
by ludwig.lierhamm...
October 28, 2015 - 10:11am
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1
1 compilation aborted
by rrachmayani@...
March 6, 2009 - 1:51am
 

The Paleoclimate Working Group contributes to the our understanding of climate change through hindcast simulations, comparing model results to data given forcings and boundary conditions (i.e. CMIP5 and PMIP3) and through sensitivity simulations to explore uncertainties in forcings. The working group is also involved in the development of modules for CESM for paleoclimate applications. Many paleoclimate modelling questions can be answered in the Paleo documentation. The Paleoclimate forum is intended for questions regarding implementation of forcings and boundary conditions specific to paleoclimate modeling.

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Paleoclimate General Announcements Forum
2
3 Paleoclimate Resources for CESM - Wiki on Github
by ottobli
1 day 1 hour ago
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Input data inquiries for paleoclimate simulations
22
84 CESM1 Paleo Users Guide
by heavens
January 28, 2016 - 4:16am
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Output data inquiries for paleoclimate simulations
8
24 SSTs and sea ice concentration fields from CCSM3 T85 x 1 last interglacial simulation
by strandwg
October 28, 2014 - 10:15am
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Paleoclimate Science Issues Forum
2
15 topography requirement in LGM
by 010022009074@...
May 12, 2015 - 7:33am
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Paleoclimate Software and Run-time issues
14
51 problem on generating rtm-to-ocn mapping files for deep time
by janezhang8587@...
August 30, 2015 - 7:20am
 

The CESM data models perform the basic function of reading external data, modifying that data, and then sending it to the driver via standard CESM coupling interfaces. The driver and other models have no fundamental knowledge of whether another component is fully active or just a data model. In some cases, data models are prognostic and also receive and use some data sent by the driver to the data model. But in most cases, the data models are not running prognostically and have no need to receive any data from the driver.

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1
1 run off
by jjakacki@...
August 26, 2011 - 5:49am
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7
39 FAQ: Data ocean slab mode (DOCN-SOM)
by liurj04@...
June 14, 2015 - 5:46am
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18
69 Writing DATM restarts to NETCDF
by liptak@...
January 27, 2016 - 9:09am
 

The Community Sea Ice Model (CSIM) is a dynamic-thermodynamic model that includes a subgrid-scale ice thickness distribution. This model is closely related to the Community Ice CodE (CICE) version 3.1.

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1
1 Welcome!
by dbailey
March 14, 2006 - 9:23pm
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0 n/a
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1
2 how to change the ice layers (NOT ice categories)
by dbailey
February 1, 2011 - 11:57am
 

The CCSM version of the Parallel Ocean Program (POP) was released in June 2004 as part of the CCSM3.0 release. It is based upon POP Version 1.4.3, which was developed at Los Alamos National Laboratory. Support for the CCSM3.0 version of the model has expired in accordance with the CESM Support Policy.

  Forum Topics Posts Last post
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5
7 About the ws input on pop
by wliu.ucsd@...
October 29, 2013 - 11:41am
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14
43 HMXL mixed layer depth
by yaozhixiong@...
February 6, 2015 - 12:17am
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12
33 How set multiyear input data in docn
by link@...
October 30, 2013 - 12:12pm
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