FIRST GEOS-CHEM USERS’ MEETING June

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Presentation transcript:

FIRST GEOS-CHEM USERS’ MEETING June 2-3 2003 Why are we here? Exchange model information and experience Identify priorities for model development Establish protocols for code management and development, relationships between users The GEOS-CHEM user community

HERITAGE OF GEOS-CHEM MODEL Harvard-GISS CTM (Prather et al., 1987) Sulfate simulation (Chin et al., 1996) Tropospheric O3 simulation (Horowitz et al., 1998; Liang et al., 1998; Wang et al., 1998) CO2 simulation (Suntharalingam et al.. 2003) GEOS-CTM (Allen et al., 1996) GEOS-CHEM CTM for tropospheric O3 (Bey et al., 2001) GOCART aerosol model (Chin et al., 2000) Current GEOS-CHEM CTM fvGCM at GMAO (data assimilation) NASA GMI (assessment) CACTUS (chem-climate) EPA CMAQ (regional air quality)

CURRENT GEOS-CHEM MODEL CAPABILITIES Goddard Earth Observing System (GEOS) global assimilated meteorological data, 1983-present including forecasts TPCORE advection, GEOS convective mass flux and PBL diagnostics Resolution: 1ox1o--4ox5o horizontal, 20-72 layers in vertical, nested capability g 1ox1o Mature applications: Tropospheric O3-NOx-VOC chemistry Aerosols coupled to chemistry CO2, CH4 Oxygenated organics, nitriles, methyl iodide Under construction: fvDAS simulation capability (for 11/02-present) Linkage to CMAQ regional model Stratospheric chemistry Mercury Methyl bromide, chloride Linkage to chemical data assimilation at GMAO Planned: Aerosol microphysics Coupling to GISS GCM meterological fields Hydrogen POPs

GEOS-CHEM DEVELOPMENT APPROACH Close association with NASA Global Modeling & Assimilation Office (GMAO) use GMAO/GEOS meteorological data sets and transport schemes Model versions updated frequently to keep up with state of science and to increase traceability benchmarking of code, single gatekeeper (Bob Y.) to minimize errors users encouraged to update to latest version as they can. No dedicated effort to support old versions. Encouragement of multi-institutional user community, user-friendliness, support free distribution of code to competent users users’ guide web site Bob Yantosca

VISION FOR GEOS-CHEM A “living CTM” focused on pushing the frontiers of knowledge of global atmospheric composition “living CTM” , “pushing the frontiers” means nimble and vigorous approach to code development and update ““global” as opposed to “regional” “atmospheric composition” in the broadest sense A tool for supporting other activities: assessments (GMI) satellite retrievals (NASA, CSA, ESA) regional air quality models (CMAQ) data assimilation (GMAO) climate models (GISS) How is this to be supported? GEOS-CHEM is a grass-roots model. It needs to be supported by its community (“consortium” a better word?): user participation, ownership, responsibility, feedback are essential Central management can be provided by Harvard (Jacob/Yantosca) for foreseeable future

A PROPOSED MANAGEMENT CHARTER FOR GEOS-CHEM Model scientist (Jacob) is responsible in consultation with users for code integrity development prioritization relationships in user community, issues of general benefit admission of new users Model programmer (Yantosca) is responsible for maintenance of standard version code updates user support interface with GMAO Users are responsible for maintaining communication with other users (web site) updating regularly to latest version of model giving credit to developers in publications not distributing code Developers are responsible for providing codes and data sets (when mature) for implementation in standard version working with model programmer in this implementation updating to new standard version (no growing parallel versions of code!)