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SECOND GEOS-CHEM USERS’ MEETING April 4-6, 2005

SECOND GEOS-CHEM USERS’ MEETING April 4-6, 2005. The GEOS-CHEM user community. Thanks to NASA/ACMAP and HUCE for providing travel support!. Meeting objectives: To share model experiences To guide model direction and define model development needs

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SECOND GEOS-CHEM USERS’ MEETING April 4-6, 2005

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  1. SECOND GEOS-CHEM USERS’ MEETINGApril 4-6, 2005 The GEOS-CHEM user community Thanks to NASA/ACMAP and HUCE for providing travel support! • Meeting objectives: • To share model experiences • To guide model direction and define model development needs • To meet each other and develop collaborations

  2. MEETING AGENDA • Monday April 4 • Model overview (9-10:30) • Global tropospheric chemistry (10:45-12:15) • Global aerosols (1:15-3:30) • Intercontinental transport (4-5:30) • 5:30: reception • Tuesday April 5 • Inverse modeling of emissions: CO and CO2 (9-10:45) • Inverse modeling of emissions: NOx and VOCs (11:15-12:45) • Expanding model capabilities (2-3:30) • Regional air quality (4-5:30) • Wednesday April 6 • Global chemical budgets (9-11) • Model issues and directions (11:15-3) • Schedule is tight and must be enforced by the chairs – please allow time for questions within your time slot! • We will project all presentations from a common PC; please email your presentations to Chris Holmes (cdh@io.harvard.edu) or give them to him during the break before your session • Presentations will be posted on meeting web site unless you object

  3. GEOS-CHEM: global chemical transport model (CTM)of atmospheric composition for concentration vector n Solve on global Eulerian grid with winds U and other meteorological variables input to the model • Regional applications: 1-way nesting or interface with independent regional model (e.g., CMAQ)…eventually 2-way nesting • Couple to dynamics (chemistry-climate and data assimilation applications) using 1-D version of model (ongoing work at Harvard and NASA/GMAO): 1-D (column) GEOS-CHEM: integrate over Dt GCM including tracer transport Couple over model time step Dt Meteorological and chemical data assimilation

  4. CURRENT GEOS-CHEM CAPABILITIES • Goddard Earth Observing System (GEOS) global assimilated meteorological data, 1983-present; GISS GCM 3 meteorological data • Resolution: 1ox1o--4ox5o horizontal, 20-72 layers in vertical, nested capability g 1ox1o, linkage to CMAQ regional model • Open-MP parallelization • Mature applications: • Tropospheric ozone and aerosol chemistry • CO2, CH4 • Mercury • Oxygenated organics, nitriles, methyl halides… • Under construction: • 1-D version (Harvard/GMAO) • Model adjoint (Caltech/Harvard/JPL/UT) • MPI parallelization (JPL) • Stratospheric chemistry (l’Aquila) • Aerosol microphysics (CMU) • Aerosol phase transitions (Harvard) • Hydrogen (UW) • POPs (CSIC-Barcelona)

  5. VISION FOR GEOS-CHEM • A CTM focused on pushing the frontiers of knowledge of global atmospheric composition • “pushing the frontiers” means nimble and vigorous approach to code development and update • “atmospheric composition” in the broadest sense • development is guided by grass-roots scientific needs • A tool for supporting other activities: • assessments (GMI) • satellite retrievals • regional air quality models (CMAQ) • data assimilation (GMAO) • climate models (GISS) How is this supported? • GEOS-CHEM is a cooperative model, owned and supported by its user community. User participation, ownership, responsibility, feedback are essential • Management is supported by NASA (1 FTE, Bob Y.). Keep management cost low and scientific return high through user participation.

  6. FUNCTIONING OF GEOS-CHEM COMMUNITY • Model Scientist (Jacob) is responsible for • code integrity • development prioritization • relationships in user community, issues of general benefit • admission of new users • Model Engineer (Yantosca) is responsible for • version control, code updates • user support • interface with GMAO • Users are responsible for • maintaining communication with other users (web site, users’ meeting) • updating regularly to latest version of model • not distributing code • providing mature new codes and data sets for implementation in standard model • giving credit to recent developers through coauthorships in publications • being resourceful

  7. WHAT’S IN A NAME? • “GEOS-CHEM” is not a proper acronym, it should be “GEOS-Chem”. Do we care? • It’s also long to write, is “GC” an acceptable acronym for an improper acronym?

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