Welcome to the 8 th International GEOS-Chem Meeting (IGC8)
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1 Welcome to the 8 th International GEOS-Chem Meeting (IGC8) A big thank you to our meeting sponsors: GEOS-Chem community: 80 institutions, 23 countries
2 Purpose of the meeting Exchange information at frontier of knowledge of atmospheric composition o Oral and poster sessions Promote collaborations within and outside the GEOS-Chem community o Social events, breaks Sustain the functioning of the GEOS-Chem community o Model clinics o Working Group meetings Define priorities for future model development o Working Group reports, discussion sessions
3 GEOS-Chem Community Mission: to advance understanding of human and natural influences on the environment through a comprehensive, state-of-the-science, readily accessible global model of atmospheric composition Input data NASA GEOS meteorological fields model grid GEOS-Chem solves 3-D chemical continuity equations on global or nested Eulerian grid Modules emissions transport chemistry aerosols deposition Model capabilities: Model adjoint Applications interpretation of observations sensitivity and inverse analyses testing new developments prediction Tropospheric-stratospheric chemistry, aerosol microphysics, subsurface coupling 1980-present NASA GEOS meteorological data from GMAO Horizontal resolution: 0.25 o x o (native) or coarser 1-way or 2-way nesting for continental domains
4 Major software engineering advances over past 2 years GEOS-Chem now operates on 1-D columns for any grid selected at runtime o enables use of meteorological fields produced on any grid o facilitates distributed-memory parallelization GEOS-Chem modules connect through the Earth System Modeling Framework () o enables use of GEOS-Chem as chemical module for Earth System Models (ESMs) o provides robust platform for MPI parallelization High-Performance GEOS-Chem (GCHP) now ready for use o massively parallel high-resolution simulations using cubed-sphere GEOS data Compatibility with open-access software including GNU Fortran (gfort) and Python (Gcpy) o no need to purchase expensive Intel Fortran and IDL licenses o enables cloud-based GEOS-Chem computing Reconfiguration of chemical module (FlexChem) o Changing chemical mechanisms is now much easier and more transparent o Choice of chemical solvers
5 GEOS-Chem as on-line chemical module in GEOS ESM any 3-D grid specified at run time Advection Off-line GEOS-Chem CTM Mixing Convection O Chemistry (FlexChem): dc/dt = P L - D Emissions (HEMCO): dc/dt = E GEOS-Chem chemical module
6 GEOS-Chem as on-line chemical module in GEOS ESM any 3-D grid specified at run time Chemistry (FlexChem): dc/dt = P L - D O Emissions (HEMCO): dc/dt = E GEOS-Chem chemical module Dynamics, chemical transport GEOS ESM with GEOS-Chem chemistry
7 GEOS-Chem as on-line chemical module in GEOS ESM any 3-D grid specified at run time Advection Mixing Convection Off-line GEOS-Chem CTM Chemistry (FlexChem): dc/dt = P L - D O Emissions (HEMCO): dc/dt = E GEOS-Chem chemical module Dynamics, chemical transport GEOS ESM with GEOS-Chem chemistry CTM and ESM use exactly the same GEOS-Chem code GEOS-Chem CTM users contribute model advances Advances are incorporated into GEOS-Chem ESM GEOS-Chem module always stays referenced to latest version Long et al. [2015]
8 Global tropospheric chemistry simulation at c720 (~12 km) resolution using on-line GEOS-Chem in GEOS ESM August 1, Z JAS 2013 ozonesondes Vertical profiles over Southeast US (SEAC 4 RS, Aug-Sep 2013) On-line GEOS-Chem is consistent with off-line Full-year on-line simulation is now used as true atmosphere for satellite OSSEs Mike Long (Harvard), Lu Hu (U. Montana), Christoph Keller, Arlindo dasilva (GMAO)
9 GEOS-Chem scientific development is driven by its users report bugs Users develop new code and data sets Your job at IGC8! Working Groups GEOS-Chem Steering Committee Model scientists, WG chairs, Model engineer, GMAO reps set model development priorities implements & benchmarks new developments, corrects bugs GEOS-Chem Support Team new model version (V11-01 released in January 2017) oversees implementation of priorities, evaluates benchmarks writes documentation
10 Looking ahead to GEOS-Chem v11-02 In development; expect public release by end of 2017 V11-02a (in benchmarking stage): chemical updates, emission updates, bug fixes (US EPA, U. York, CSU, UW, Duke, Dalhousie ) V11-02b: GCHP capability (GEOS-Chem Support Team) V11-02c: isoprene chemistry and SOA updates (Harvard, U. Wollongong, U. Birmingham, Caltech, CSU) V11-02d: comprehensive halogen chemistry (U. York, U. Copenhagen, Harvard) In the pipeline: c720 (12 km) resolution, new emission inventories, improved deposition, flux diagnostics, NetCDF diagnostics, OVOC chemistry, nested specialty simulations, GCHP for specialty simulations See
11 Continued success of GEOS-Chem relies on user community Community spirit of ownership goes a very long way You contribute to the model simply by using it Be generous with citations and credit to developers in your publications Report bugs, share model developments, contribute to Working Groups Keep up with model: new versions, wiki, Working Groups, IGC meetings Keep up the spirit YOU own the model Consider co-chairing a Working Group, serving on Steering Committee!
12 CPU Speed (MHz) GEOS-Chem Growth Outstrips CPU Speeds Finer resolution Additional tracers Detailed chemistry (e.g. organics) Stratospheric chemistry Finer timesteps Aerosol microphysics CPU speed has stalled since ,000 10,000 1, Year of Introduction National Academies Press (2011)
13 Adapted from Jiawei Zhuang Next-Generation High-Performance GEOS-Chem (GCHP) GEOS-Chem Classic Inefficient above 16 Cores Shared Memory (OpenMP) GCHP Massively Parallel Distributed Memory (MPI) Regular lat-lon Cubed-sphere
14 GEOS-Chem Is GCHP GCHP Offers Computational Framework For: Sophisticated Chemistry Additional Tracers Finer Resolution Surface Ozone (C180) Play movie Jiawei Zhuang and Mike Long (Harvard)
15 GCHP Timeline GIGC (Grid Independent GEOS-Chem) appears in GEOS-Chem Code GIGC (Long et al First GCHP Simulation (scientifically inaccurate) Beta release (scientifically accurate) Alpha GCHP Release (scientifically inaccurate) Becomes default GEOS- Chem Inclusion in v11-02b Builds on cubed-sphere and specialized software (MAPL) developments at GMAO
16 Annual Citation Rate (Citations / Year) Sustain the Scientific Growth of GEOS-Chem GCHP Offers the Computational Framework Need Your Creativity, Scientific Development and Collaborative Spirit GEOS-Chem Annual Citation Rate Year
17 GEOS-Chem development movie
18 Extra slides
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