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CCSM/LANL Parallel Ocean Program (POP)
Entry ID:
LANL-POP
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Summary
Abstract:
POP is an ocean circulation model derived from earlier models of Bryan, Cox,
Semtner and Chervin in which depth is used as the vertical coordinate. The
model solves the three-dimensional primitive equations for fluid motions on the
sphere under hydrostatic and Boussinesq approximations. Spatial derivatives are
computed using finite-difference discretizations which are formulated to handle
any generalized orthogonal grid on a sphere, including dipole and tripole grids
which shift the North Pole singularity into land masses to avoid time step
constraints due to grid convergence.
Time integration of the model is split into two parts. The three-dimensional
vertically-varying (baroclinic) tendencies are integrated explicitly using a
leapfrog scheme. The very fast vertically-uniform (barotropic) modes are
integrated using an implicit free surface formulation in which a preconditioned
conjugate gradient solver is used to solve for the two-dimensional surface
pressure.
A wide variety of physical parameterizations and other features are available
in the model and are described in detail in a reference manual distributed with
the code. Because POP is a public code, many improvements to its physical
parameterizations have resulted from external collaborations with other ocean
modeling groups and such development is very much a community effort. Detailed
descriptions of the numerical discretizations and methods are described in the
reference manual and in other publications.
Although POP was originally developed for the Connection Machine, it was
designed from the start for portability by isolating all routines involving
communication into a small set (5) of modules which can be modified for
specific architectures. Currently, versions of these routines exist for MPI and
SHMEM communication libraries and also for serial execution. The appropriate
directory is chosen at compile time and no pre-processor directives are used to
support different machines. Support for hybrid programming using threads and
message passing has recently been added and is described in the User's Guide.
POP is the ocean component of the Community Climate System Model and has been
used extensively at LANL in ocean-only mode for eddy-resolving simulations of
the global ocean and for ocean-ice coupled simulations with the CICE model.
The CCSM3.0 POP is based upon POP Version 1.4.3, which was developed at Los
Alamos National Laboratory. Over the course of CCSM3 POP model development,
there have been many small changes to the original POP 1.4.3 code in order to
allow the code to conform to CCSM requirements. Also, some corrections have
been applied, diagnostics have been added, and more substantial modifications
have been made to the code to improve the model physics. Wherever possible, a
deliberate effort has been made to alter the base POP 1.4.3 code as little as
possible, mainly by adding new modules instead of integrating the additions
into the original POP code. However, many of the CCSM-related requirements
resulted in modifications to numerous existing POP modules.
POP is freely available to the community (under a copyright agreement); you can
download the latest version from these pages.
(Summary adapted from LANL.)
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Related URL
Link:
GET SERVICE
>
GET SOFTWARE PACKAGE
Description:
Users are able to download POP from here.
Link:
GET SERVICE
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GET SOFTWARE PACKAGE
Description:
The POP is also available from the Earth System Grid (ESG).
Link:
GET RELATED SERVICE METADATA (SERF)
Description:
CICE: The Los Alamos Sea Ice Model
CICE is a numerical model of sea ice. It is designed to be a component of
global climate models, although it can also be used in standalone mode for sea
ice simulations. CICE has been developed to be compatible with the Parallel
Ocean Program (POP) and the Community Climate System Model.
Link:
GET RELATED SERVICE METADATA (SERF)
Description:
The CCSM3.0 coupled model, released in June, 2004, provides the community with
a coupled model framework for carrying out climate simulations. Upgrades from
CCSM2.0.1 release can be found in the Introduction section of the Users Guide
CCSM coupled model is based on a framework which divides the complete climate
system into component models connected by a coupler. This design requires four
component models -- atmosphere, land, ocean, and sea-ice -- each connected to
the coupler, and each exchanging data with the coupler only. From a software
engineering point of view, the CCSM is not a particular climate model, but a
framework for building and testing various climate models for various
applications. In this sense, more than any particular component model, the
coupler defines the high-level design of CCSM software.
Link:
VIEW RELATED INFORMATION
Description:
Documentation in PDF format
Link:
VIEW RELATED INFORMATION
Description:
The Community Climate System Model (CCSM3) 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.
Link:
VIEW RELATED INFORMATION
Description:
Additional information and documentation on the CCSM POP
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Service Citation
Originators:
LANL
Title:
Parallel Ocean Program (POP)
Release_Date:
2004-01-21
Provider:
Los Alamos National Lab
Edition:
Release: 2.0.1
URL:
http://climate.lanl.gov/Models/POP/
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ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
OCEANS
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Use Constraints
The CICE code is freely available under a copyright agreement. Atmospheric
forcing data for 1997 are also available. These data files are designed only
for testing the code and are not necessarily the best observational data.
Please do not publish results based on these data sets.
The POP compponent of the CCMS3.0 is available, but users must register first
and agree to the copyright notice and distribution:
http://www.ccsm.ucar.edu/models/ccsm3.0/copyright.html
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Distribution Media
Distribution_Media:
download
Distribution_Format:
compressed .tar
Fees:
none
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Personnel
PHIL
W.
JONES
Role:
TECHNICAL CONTACT
Email:
pwjones at lanl.gov
Contact Address:
Los Alamos National Laboratory
P.O. Box 1663
City:
Los Alamos
Province or State:
NM
Postal Code:
87545
Country:
USA
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TYLER
B.
STEVENS
Role:
SERF AUTHOR
Phone:
(301) 614-6898
Fax:
301-614-5268
Email:
Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
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Publications/References
Alley, R.B. "Reliability of ice-core science: Historical insights," Journal of Glaciology, v.56, 2010, p. 1095.
Fegyveresi, J.M., R.B. Alley, M.K. Spencer, J.J. Fitzpatrick, E.J. Steig, J.W.C. White, J.R. McConnell and K.C. Taylor. 2011. Late-Holocene climate evolution at the WAIS Divide site, West Antarctica: bubble number-density estimates. Journal of Glaciology 57(204), 629-638.
McGwire, KC; McConnell, JR; Alley, RB; Banta, JR; Hargreaves, GM; Taylor, KC. "Dating annual layers of a shallow Antarctic ice core with an optical scanner," JOURNAL OF GLACIOLOGY, v.54, 2008, p. 831-838.
Creation and Review Dates
SERF Creation Date:
2005-08-18
SERF Last Revision Date:
2012-02-15
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