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ESMF and the Weather Research and Forecast Model . John Michalakes, Thomas Henderson Mesoscale and Microscale Meteorology Division National Center for Atmospheric Research michalak@ucar.edu Thomas Black Environmental Modeling Center NOAA / National Centers for Environmental Prediction.

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esmf and the weather research and forecast model

ESMF and the Weather Research and Forecast Model

John Michalakes, Thomas Henderson

Mesoscale and Microscale Meteorology Division

National Center for Atmospheric Research

michalak@ucar.edu

Thomas Black

Environmental Modeling Center

NOAA / National Centers for Environmental Prediction

weather research and forecast model
Weather Research and Forecast Model

Goals: Develop an advanced mesoscale forecast

and assimilation system, and accelerate

research advances into operations

  • Large collaborative effort to develop next-generation community model with direct path to operations
  • Advanced Software Architecture
    • Modular, flexible, extensible
    • Portable and efficient
    • Designed for HPC
  • Applications
    • Atmospheric Research
    • Numerical Weather Prediction
    • Coupled modeling systems
    • Air quality research/prediction
    • High resolution regional climate
    • prediction
    • Air quality research and prediction
    • Regional climate

+ DTC

weather research and forecast model1

Top-level Control,

Memory Management, Nesting,

Parallelism, External APIs

driver

ARW solver

NMM solver

Physics Interfaces

mediation

Plug-compatible physics

Plug-compatible physics

Plug-compatible physics

Plug-compatible physics

model

Plug-compatible physics

Weather Research and Forecast Model

Goals: Develop an advanced mesoscale forecast

and assimilation system, and accelerate

research advances into operations

  • Large collaborative effort to develop next-generation community model with direct path to operations
  • Advanced Software Architecture
    • Modular, flexible, extensible
    • Portable and efficient
    • Designed for HPC
  • Applications
    • Atmospheric Research
    • Numerical Weather Prediction
    • Coupled modeling systems
    • Air quality research/prediction
    • High resolution regional climate
    • prediction
    • Air quality research and prediction
    • Regional climate
esmf support
ESMF Support
  • WRFV2.2 fully interoperable as ESMF component
    • Runs stand-alone without ESMF, or
    • Fully integrated component in ESMF
    • Distributed with ESMF unit test coupled “data” ocean
  • Infrastructure:
    • ESMF Time Manager using reference implementation or shared implementation with CCSM
  • Superstructure: “Wrapperized”
    • Top level init-run-finalize convention
    • ESMF conforms to “coupling as I/O” and is integrated with WRF Registry
wrf model coupling
Extension of WRF I/O API

MCEL (U. Southern Miss.)

MCT (Argonne NL)

ESMF

Projects

WRF/ROMS, WRF/ADCIRC/SWAN/LSOM

Very high resolution urban airflow modeling (Fei Chen, NCAR; CFD Corp.)

Coupled WRF/HYCOM Katrina simulation

MCEL

MCT

ESMF

WRF Model Coupling

ESMF Superstructure

wrf hycom coupling esmf
WRF and HYCOM two-way coupled through ESMF to improve modeling of hurricane intensification

Synchronization is through successive calls to components by ESMF top-level driver

Status:

WRF an ESMF component (NCAR),

Init-run-finalize at top level

Import/export through WRF I/O API

ESMF Time Manager

WRF I/O in ESMF

HYCOM-ESMF (NRL)

HYCOM component

ESMF WRF Component Interface

WRF/HYCOM Coupling (ESMF)

ESMF Superstructure

WRF export state:

Surface winds & air temps

Precipitation

Radiation fluxes

WRF import state:

SST, Roughness length

HYCOM export state:

SSTs

HYCOM import state:

Winds

Precipitation

Radiation fluxes

execution control

regridding

WRF component

ESMF WRF Component Interface

WRF I/O API

ESMF Infrastructure

wrf lis coupling through esmf
WRF/LIS Coupling through ESMF
  • LIS = Land Information System
    • NASA GSFC (lis.gsfc.nasa.gov)
    • Incorporates CLM, Noah, and VIC land surface models
  • Initial WRF-LIS prototype by Sujay Kumar (GSFC)
    • Coupled via WRF surface driver using ESMF
    • All ESMF objects manufactured by LIS
  • Planned
    • WRF provides ESMF_State objects to LIS
    • Extend to allow different grids
interoperability
Interoperability
  • Supported metadata formats: NetCDF+parallel, HDF+parallel, GRIB[1&2]
  • Participating in continuing refinement of Climate and Forecast metadata convention
    • Participate in GOESSP meetings to discuss conventions (go-essp.gfdl.noaa.gov)
    • Provide feedback for Balaji’s “Gridspec” proposal (www.gfdl.noaa.gov/~vb/gridstd/gridstd.html)
interoperability1
Interoperability
  • Share goals with Earth System Curator
    • Similar approaches may apply to forecast V&V, managing ensembles, etc.
      • Earth System Curator-Numerical Model Metadata (NMM) standard
        • http://ncas-cms.nerc.ac.uk/NMM/index.php
        • Full specification of an “experiment”
      • Automatic testing of component compatibility
dynamic load balancing
Key obstacle for Petascale; opportunity for new approaches, e.g. PGAS languages

Instrument WRF using PAPI

Generated high-resolution traces over 8 day period in July ’05

Characterize dynamic load from microphysics as functions of

Decomposition

Sizes, trajectories, other characteristics of load features

Dynamic Load Balancing

Workload Characterization of

Physics-Induced Load Imbalance in WRF (draft NCAR TM, 2007)

dynamic load balancing1
Key obstacle for Petascale; opportunity for new approaches, e.g. PGAS languages

Instrument WRF using PAPI

Generated high-resolution traces over 8 day period in July ’05

Characterize dynamic load from microphysics as functions of

Decomposition

Sizes, trajectories, other characteristics of load features

Dynamic Load Balancing

Workload Characterization of

Physics-Induced Load Imbalance in WRF (draft NCAR TM, 2007)

Figure 6: Maximum, average, minimum, and standard-deviation of load imbalance over eight-day measurement period as function of subdomain size.

plans
Plans
  • Convergence of ESMF and WRF software
    • WRF as ESMF component (current)
    • Support for additional infrastructure elements
    • Support for ESMF components coupled in WRF call tree
    • Continue to follow, participate in data-interoperability standardization (C.F., Curator)