1 earth system modeling framework esmf and the transformation of earth system modeling sylvia...
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Earth System Modeling Framework
ESMF and the Transformation of Earth System Modeling
http://www.esmf.ucar.edu
Sylvia [email protected]
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Outline
What is ESMF? Who is Using it? How is ESMF Transforming Earth System Modeling? Current Development Status Future Directions
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What is ESMF?
ESMF is a software library that consists of coupling tools and model utilities that increase modularity, interoperability, and performance of geoscience applications.
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What models are using ESMF?
Operational Version of the GFS Weather Forecasting Model
GEOS-5 Atmospheric GCM
HYCOM Ocean ModelCOAMPS Atmospheric ModelCICE-HYCOM
58 components are currently using ESMF
WRF Weather Forecasting Model
ADCIRC Hydrodynamic modelADCIRC-WASH123
MIT GCM
GFDL FMSMOM4 UCLA AGCM
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What programs are using ESMF? NUOPC: National Unified Operational Prediction Capability Consortium (NOAA, Navy, Air Force Weather Agency)
Has announced intentions to base its next generation National Weather Prediction (NWP) system on ESMF
BEI: Battlespace Environments InstituteDeveloping integrated forecasting systems
across DoD.
MAP: Modeling and Analysis ProgramFacilitating research and model use of NASA data
Image from NOAA rapid refresh (RR) model, a replacement model for the Rapid Update Cycle (RUC) model.
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The Transformation of Earth System Modeling
How models are structured How models are developed The scale of collaborations Governance strategies for
developing community scientific software
ESMF is changing:
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How Models are Structured
Hierarchical component based architecture
Interchangeability Easy replacement of
component elements Interoperability
Swapping component between applications
Coupling diverse applications
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How Models are Developed
Large number of components available from across the community
Develop science components for a well-understood community architecture and interfaces
Technological advances are propagated quickly across many applications simultaneously
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The Scale of Community Collaborations
Collaborations across: Operational centers (e.g
CNMOC, COPC, FNMOC) Research centers (e.g.
GFDL, NCAR, NASA Goddard)
Universities (e.g. MIT, University of Hawaii)
Different domains (weather, climate, space weather, hydrology)BEI: Battlespace Environment Institute
NUOPC: National Unified Operational Prediction Capability
CCSM: Community Climate System Model
WRF: Weather Research & Forecasting Model
MAP: Modeling Analysis and Prediction Program
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Governance strategies for developing community scientific software
Distributed, global development
Direct participation of users in setting development priorities
Multi-agency management
Incorporates open-source methodologies into scientific software development
Shared governance model emphasizes:
[email protected] has 300 subscribers who participate in ESMF development
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ESMF Release Plan2002 2003 2004 2005 2006 2007 2008 2009 2010
ESMF v1Prototype
ESMF v2Components, VM and UtilsESMF_GridCompRun()
ESMF v3Index Space OperationsESMF_ArraySparseMatMul()
ESMF v4Grid OperationsESMF_GridCreate()ESMF_FieldRegrid()
ESMFv5StandardizationBuild, init, data types, error handling, …
Last publicESMF v2.2.2r
Last internalESMF v3.0.3
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Current Features (v3.0.3) Component-based architecture Allows serial or parallel execution Components can run concurrently or sequentially Single executable support, limited support for multiple
executables Support for model ensembles User friendly uniform, rectilinear, and curvilinear grid
representation Unstructured and multi-patch grids represented in index space Regridding via sparse matrix multiply with user defined weights Utilities such as time manager, message logger, and resource
file manager are usable and adding features Fortran interfaces and complete documentation, increasing
number of C interfaces Distributed with Reference Manual, Users Guide, ~2500 tests
and examples ~2000 downloads
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Current Supported Platforms Cray X1 Cray XT3/4 HP ZX6000 Linux intel IBM Bluegene, IBM Opteron Linux pathscale IBM Opteron Linux pgi IBM SP MAC G5 Darwin xlf MAC G5 Darwin xlfgcc MAC G5 Darwin nag
ESMF runs 2500 tests on all these platforms every night
MAC G5 Darwin absoft Pentium III Linux lahey Pentium III Linux pgi Pentium III Linux pgigcc PC Xeon Cluster Linux
absoftintel PC Xeon Cluster Linux g95 PC Xeon Cluster Linux intel PC Xeon Cluster Linux nagintel SGI Altix Linux nagintel SGI Origin 3800
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Sparse Matrix Multiply Updated
User supplied weights Facilitates the widest possible couplings The methods have the following new features:
Improved performance and reduced memory usage
Support for distributed definition of factors
Support for user-supplied arbitrary sequence indices via 1D DistGrid
Support for ESMF_TYPEKIND_I4/I8/R4/R8 Default initialization of destination Array to zero (can be overridden)
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New Structured Grids
Support 1D, 2D, 3D and higher dimensions
Supports parallelization across any or all grid dimensions
Supports uniform, rectilinear and curvilinear grids
Image of HYPSE (Hydrostatic Padua Surface Elevation Model) Dept .of Physics, Univ. of Padua
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Near Future: Structured Grids
Multi-tile grids (e.g. cube-sphere) More efficient memory use for
non-curvilinear grids Coordinate halo A wide variety of different types of
connections between tile edges Automatic generation of topology
and coordinates for common shapes (e.g. sphere)
Image courtesy Steve Thomas and Rich Loft, NCAR
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Near Future: General Regridding
Exact curl
Curl of bilinear interpolant
Curl of patch-recovered interpolant
Work conducted by David Neckels/ESMF in collaboration with Bill Large of the ocean modeling section at NCAR.
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Near Future: Unstructured Grids
Uses same infrastructure as general regridding
Representation for hydrology grids and other grids
Future basis for exchange grids and observational data streams
Image of rossby waves on a triangular adaptive grid (Alfred-Wegener-Institute for Polar and Meteorological Forecasting)
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Longer Term: Interoperability & Integration Initiative
Enable groups with compilations of ESMF components to develop integrated modeling systems
Define standards to increase component interoperability Metadata conventions
Strategies for automation and supplemental tools (e.g. MAPL)
http://esmfi3.org/wiki/