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Dear GEOS-Chem Users,

A belated Happy St. Patrick's Day to one and all! Here is the March 2009 edition of the GEOS-Chem newsletter.

Bob Yantosca, Philippe Le Sager, and Claire Carouge
geos-chem-support@as.harvard.edu

Requests for help

Just a reminder: all GEOS-Chem questions should be sent to the email address geos-chem-support@as.harvard.edu. This will ensure that Bob, Philippe, and Claire will all receive your email question at the same time. This will allow us to serve you better. If one of us is unavailable then the others will be able to respond to you.

GEOS-Chem update

Emissions release v8-01-04 "beta"

GEOS-Chem v8-01-04 "beta", our emissions release, is now released! This version contains several updated emissions inventories. For a full description, including information about the 1-year benchmark simulations that were performed, please visit this link.

Also, Philippe Le Sager has prepared a document (PDF format) which describes the anthropogenic emissions sources in more detail.

Chemistry release v8-02-01

GEOS-Chem v8-02-01, our chemistry release, is undergoing final testing at this point. A few technical problems with the GLYX chemistry mechanism are being ironed out by May Fu and Claire Carouge.

Also, we would like to acknowledge the Palmer group (U. Edinburgh), Dylan Millet (UMN), and Jingqiu Mao (Harvard), who have been reviewing the GEOS-Chem chemistry mechanism file to make sure that we have the most up-to-date list of reactions. The updated mechanism will be included in v8-02-01.

GEOS-Chem v8-02-01 will be a "public" release (i.e. the manual page and other documentation will be rewritten). However, due to time concerns, it will probably not be ready before the GEOS-Chem meeting. We hope to have this version ready soon thereafter.

GEOS-Chem email lists

The following email lists:

• GEOS-Chem users
• GEOS-Chem aerosols
• GEOS-Chem adjoint

were recently switched over from the geos.as.harvard.edu server to the seas.harvard.edu server. Therefore, to send email to the entire list, you must now use the following addresses:

• geos-chem@seas.harvard.edu
• geos-chem-aerosols@seas.harvard.edu
• geos-chem-adjoint@seas.harvard.edu

Also note, during the transition, some email addresses may have not been copied over correctly. If you feel that you have been deleted from the list, you can resubscribe via this web interface.

ESMF update

Development of the GEOS-Chem column chemistry module is proceeding swiftly. Several of the sub-processes in the chemistry (e.g. inputs, photolysis, carbon & sea salt aerosol chemistry, aerosol thermodynamical equilibrium) have been columnized. Much of the remaining code lends itself to columnization; however, in many cases legacy code must be removed or updated.

Bob and Philippe have provided GSFC with a list of input and output arguments that the GEOS-Chem column chemistry module will use. This list is being refined with the assistance of Max Suarez and Arlindo da Silva from GSFC. Once the list is finalized, GSFC will create an interface to the GEOS-5 GCM to which the GEOS-Chem column chemistry module will be attached.

Development of the ESMF component for the GEOS-Chem emissions has been temporarily suspended, as the priority now is to prepare the GEOS-Chem column chemistry component for inclusion into the GEOS-5 GCM. However, the emissions component will more than likely be adapted to become the GEOS-Chem "emissions" driver within the GEOS-5 GCM. Also, the emmissions component will be an important part of an eventual standalone ESMF GEOS-Chem model.

GEOS-5 met field reprocessing

Status

As described in the January 2009 newsletter, we are reprocessing the entire archive of GEOS-5 met field data. As of February 17, 2009 the following fields have been completed:

• 2008: entire year
• 2004: July - December
• 2005: January - March

for each of the following geographic domains:

• China nested 0.5 x 0.667
• Global 2 x 2.5
• Global 4 x 5

The files have been TAR'd and Gzip'd for your convienience (as this dramatically reduces the size of the data). In each directory there are files 01.tar.gz, 02.tar.gz .. 12.tar.gz, each of which contains a single month of met field data. GEOS-Chem users outside Harvard may obtain these data files via anonymous FTP:

 ftp ftp.as.harvard.edu
 cd pub/geos-chem/data/GEOS_0.5x0.666_CH.d/GEOS_5/2008
 mget *.tar.gz
 cd pub/geos-chem/data/GEOS_2x2.5.d/GEOS_5/2008
 mget *.tar.gz
 cd pub/geos-chem/data/GEOS_4x5.d/GEOS_5/2008
 mget *.tar.gz
 cd pub/geos-chem/data/GEOS_0.5x0.666_CH.d/GEOS_5/2004
 mget *.tar.gz
 cd pub/geos-chem/data/GEOS_2x2.5.d/GEOS_5/2004
 mget *.tar.gz
 cd pub/geos-chem/data/GEOS_4x5.d/GEOS_5/2004
 mget *.tar.gz

However, to simplify the FTP process you might want to use a 3rd party FTP software program with a GUI interface, such as Mozilla FireFTP.

At present, the throughput rate is approximately 28 days of model data per day. Therefore it will still be a couple of months before the entire GEOS-5 dataset has been reprocessed.

GEOS-Chem Meeting: April 7-10, 2009

The 4th Annual GEOS-Chem Scientific & Users' Meeting is rapidly approaching. Daniel has provided a first draft of the meeting agenda (click here for PDF format). Please direct your questions about the agenda to Daniel Jacob (djacob@fas.harvard.edu).

Registration for the meeting is now closed.

--Bob Y. 11:00, 18 March 2009 (EDT)