GEOS-Chem Adjoint Model
General
Historical Overview
Original work on the adjoint of GEOS-Chem began in 2003, focusing on the adjoint of the offline aerosol simulation. By 2004, the adjoint was expanded to include a tagged CO simulation and a full chemistry simulation. The adjoint code has been constructed in a hybrid fashion using a combination of automatic differentiation software (TAMC, KPP) and manual coding of both discrete and continuous adjoints. Current development aims to standardize the implementation of the adjoint model and make it more user friendly, with the eventual goal of making the adjoint publicly available as part of the standard GEOS-Chem code base.
Developers
- Caltech: John Seinfeld
- Carleton University: Amir Hakami
- Columbia / NASA GISS / CU Boulder : Daven Henze
- Dalhousie: Randall Martin, Chulkyu Lee
- Harvard: Monika Kopacz, Daniel Jacob
- JPL: Kevin Bowman, Qinbin Li, Xun Jiang, Changsub Shim, Yang Chen, Sunita Verma
- U. of Toronto: Dylan Jones, Mark Parrington, Michael Seymour
- Virginia Tech: Adrian Sandu, Kumaresh Singh, Paul Eller
Current Activities
- to add
Get Involved
Support and development of the GEOS-Chem adjoint has clearly become a multifaceted undertaking. In attempt to focus such developments, we've created a GC-adjoint mailing list. If you wish to become involved, you should add yourself to this list by sending an email to geos-chem-adjoint-requests@geos.as.harvard.edu with the word subscribe in the subject or body.
Adjoint Model Branches
There are currently three main branches of the GEOS-Chem adjoint model.
- GEOS-Chem v6-02-05, full chemistry with online aerosols
- GEOS-Chem v6/v7, tagged CO/CO2
- GEOS-Chem v7, full chemistry
GEOS-Chem v6-02-05, full chemistry with online aerosols
Features
- GEOS-3
- 4x5
- Several Observational Operators
- IMPROVE PM2.5 (NO3, SO4, OC, BC)
- CASTNet (NH4+)
- GOME / SCIAMACHY NO2 column using KNMI retrieval
Primary Developer
Daven Henze
GEOS-Chem v6/v7, tagged CO/CO2
Features
Primary Developer
Monika Kopacz
GEOS-Chem v7, full chemistry
Features
Primary Developer
Kumaresh Singh
GEOS-Chem Adjoint Publications
- Kopacz, M., D. J. Jacob, D. K. Henze, C. L. Heald, D. G. Streets, and Q. Zhang (2008), A comparison of analytical and adjoint Bayesian inversion methods for constraining Asian sources of CO using satellite (MOPITT) measurements of CO columns, J. Geophys. Res., doi:0.1029/2007JD009264.
- Henze, D. K., A. Hakami and J. H. Seinfeld (2007), Development of the adjoint of GEOS-Chem, Atmos. Chem. Phys., 7, 2413-2433.