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The Data Assimilation Research Testbed -- DART![]() The 500hPa geopotential height from 20 ensemble members of an 80 member experiment with a T85 resolution of CAM (00Z 01 Feb 2003). The contour sets are from 5320 to 5800 by 80. |
The DART software provides a flexible, extensible framework for conducting
data assimilation research on a wide variety of models and observations.
In order to facilitate the incorporation of new models (which, in the
Atmospheric Science community are generally written in F90), the DART
software is written primarily in F90. The noteable exceptions are the
shell scripts that control execution and the Matlab® diagnostic scripts.
The DART system comes with many models - ranging from 1-dimensional
Lorenz systems to the dynamical core of a full atmospheric model.
DART also has an extensive tutorial that explains typical DART experiments
and explores many aspects of ensemble data assimilation.
The tutorial is an entire directory in the DART software distribution, so
it can be browsed (it is a series of .pdf files)
Download the DART source code and follow the instructions
on the web page for the current release for
instructions on how to build an executable, run the "workshop" experiments,
and look at the results.
DART is intended to be highly portable but has a strong Unix/Linux preference. DART has been run successfully on Windows machines under the cygwin environment. Those instructions are under development - if you would like to be a friendly beta-tester please send me (Tim Hoar) an email and I'll send you the instructions, as long as you promise to provide feedback (good or bad!) so I can improve them. My email is thoar @ ucar . edu - minus the spaces, naturally. Minimally, you will need a Fortran90 compiler and the netCDF libraries built with the F90 interface. History has shown that it is a very good idea to make sure your run-time environment has the following:
DART/models/model_mod.html - as does all the most
current documentation.
Every(?) DART program/module has a matching piece of documentation.
DART is intended to be highly portable - and has even run successfully on Windows machines running the cygwin environment. Those instructions are under development and so are not included in the following table. The most current version of DART (Jamaica) has been tested on the following:
| hardware | O/S | F90 compiler | batch manager |
|---|---|---|---|
| Intel cluster/SMP/32 bit | Red Hat Enterprise | Intel 9.0 (build 20051201) | none |
| Intel cluster/SMP/32 bit | Red Hat Enterprise | GNU Fortran 95 4.1.0 | none |
| Intel Nocona | SUSE | PGI 6.0-8 | LSF |
| Intel Nocona | SUSE | Intel 9.1 (EM64T) | LSF |
| Intel iMac | Mac OS X 10.4.6 | gfortran 4.2.0 | Open-MPI |
| IBM Power 5+ | AIX 5.3 | XLF 10.1.0 | LSF |
| Intel | Fedora Core 4 | Intel 9.0 | none |
| PowerBook G4 (PowerPC) | Mac OS X 10.4.8 | Absoft Pro Fortran 9.0 | none |
| PowerBook G4 (PowerPC) | Mac OS X 10.3.9 | Absoft Pro Fortran 9.0 | Lam |
| PowerBook G4 (PowerPC) | Mac OS X 10.3.9 | gfortran 4.2.0 | Lam |
| Intel cluster (Xeon) | Fedora Core 2 | PGI 6.0-5 | PBS |
| Intel cluster (Xeon) | Fedora Core 2 | PGI 5.2-4 | PBS |
| Intel cluster (Xeon) | Fedora Core 2 | Lahey 6.20c | PBS |
| IBM cluster (of opterons) | SUSE Enterprise 8 | Pathscale 2.4 | LSF |
| IBM cluster (of opterons) | Suse Enterprise 8 | Intel 9.1 (EM64T) | LSF |
| IBM cluster (of opterons) | Suse Enterprise 8 | PGI 6.2 | LSF |
| SGI Altix | SUSE Linux ES 9.3 | Intel 9.1 | PBS |
| SGI MIPS | IRIX 6.5 | MIPSpro 7.4.3m | NQS |
| Linux cluster | Intel | Intel 9.1 | PBS |
DART is distributed primarily through an anonymous-access readonly
SVN repository. This makes updates and
comparisons between your sandbox and the latest, greatest version of the
code trivially easy. The same cannot be said with a TAR file.
If you are not familiar with SVN (the client application of subversion),
you should take a stroll through my
svn primer
If you cannot (i.e. are firewalled out) use svn, please let me know and
I'll send you a tarfile ... as a last resort.
Since the DART software is still an area of active research, there are
multiple distributions, with more on the way. We'd like to be able to contact
people to inform them of any bugs or updates. (This includes local users, BTW!)
As you can see by the timetable of distributions, you could expect to get
about 2 more emails per year, so PLEASE use a real email address when signing up.
I solemnly swear to protect your email address like it is my own!
download instructions for the latest releases.
The Jamaica version of DART (the latest 'official' release) has the following
attributes for this file. Since svn uses 'mixed revisions',
files in the distribution will have different revision numbers. If you download
the 'trunk' (the latest version) - the revision numbers are assuredly different.
| Revision: | Revision: 2857 |
| Source: | URL: http://subversion.ucar.edu/DAReS/DART/trunk/doc/html/index.shtml |
| Change Date: | Date: 2007-04-12 10:44:44 -0600 (Thu, 12 Apr 2007) |
| version | date | instructions | most noteable change(s) |
|---|---|---|---|
| jamaica | 12 Apr 2007 | [doc] | vertical localization, extensive testing of MPI implementation,
full documentation for new algorithms, new tutorial sections change log |
| pre_j | 02 Oct 2006 | [doc] | contains an updated scalable filter algorithm |
| post_iceland | 20 Jun 2006 | [doc] | observation-space adaptive inflation, bug fixes, merge_obs_sequence support ... change log |
| iceland | 23 Nov 2005 | [doc] | huge expansion of real observation capability better namelist processing, PBL_1d available. change log |
| pre_iceland | 20 Oct 2005 | for developers only | huge expansion of real observation capability |
| DA workshop 2005 | 13 June 2005 | docs included in distrib. | tutorial directory in distribution, observation preprocessing |
| hawaii | 28 Feb 2005 | [doc] | new filtering algorithms |
| pre-hawaii | 20 Dec 2004 | [doc] | new filtering algorithms |
| guam | 12 Aug 2004 | [doc] | new observation modules, removing autopromotion |
| fiji | 29 Apr 2004 | [doc] | enhanced portability, CAM, WRF |
| easter | 8 March 2004 | [doc] | initial release |
The DART system comes with an extensive set of tutorial materials, working
models of several different levels of complexity, and data to be assimilated.
It has been used in several multi-day workshops and can be used as the basis
to teach a section on Data Assimilation.
Download the DART software distribution and look in the tutorial
subdirectory for the pdf and framemaker source for each of the 22 tutorial sections.
Browsing the tutorial directory in the distribution is worth
the effort. Taking the tutorial is FAR better!
The FULL list of presentations (as well as some of the presentations themselves) and publications is available on our Publications page. A short list of presentations, posters, and seminars is offered below:
We're a very small group, so the contact list is pretty short. We don't have a central contact email address, but we all know how to forward email to each other. So no matter who you send the email TO, it will find its way to the best person. Pretty cool, eh?
| general | general | platforms/mpi | CAM |
|---|---|---|---|
| Jeff Anderson | Tim Hoar | Nancy Collins | Kevin Raeder |
| jla @ ucar . edu | thoar @ ucar . edu | nancy @ ucar . edu | raeder @ ucar . edu |