A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G.


НазваA rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G.
Дата конвертації15.03.2013
Розмір445 b.
ТипПрезентации


A Rapid Prototyping Capability Experiment to Evaluate CrIS / ATMS Observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. Anantharaj, Xingang Fan, Christopher M. Hill, Patrick J. Fitzpatrick, and Yongzuo Li (Mississippi State University) Michiko Masutani and Lars-Peter Riishojgaard (Joint Center for Satellite Data Assimilation) March 2, 2009


General Overview

  • National Polar-orbiting Operational Environmental Satellite System (NPOESS) to be launched in 2013

  • preceding NPOESS Preparatory Project (NPP) to be launched in 2010

  • component sensors of NPOESS and NPP to include:

    • Advanced Technology Microwave Sounder (ATMS)
    • across track scanning microwave radiometer
    • cross-track resolution: 15.0 km
    • Cross-track Infrared Sounder (CrIS)
    • Fourier transform spectrometer
    • cross-track resolution: 14.0 km
    • vertical resolution: ~ 3.0 km
  • Combination of ATMS / CrIS should improve profiles of T and q

  • Mesoscale OSSE needed to assess the impact of ATMS / CrIS



NWP OSSE Methodology



Mesoscale Case event identified from ECMWF T799 NR May 2 - 4: squall line affecting all points along US Gulf coast



MSU OSSE Approach

  • Objective: investigate the impact of new satellite data observations on the numerical model representation of a regional weather event

  • Case event: squall line system of thunderstorms affecting the Gulf Coast

  • Regional Scale Nature Run (RSNR) using MM5 model

    • one-way nested grid set, with ICs and BCs from ECMWF NR data
  • Sensitivity experiments

    • use second model (WRF) to avoid similarity in model error (fraternal twin problem)
    • WRF model calibrated with background errors
  • Steps involved in data assimilation experiments

    • Cold start simulation (no data assimilation)
    • First assimilate synthetic surface, rawinsonde observations
    • Then assimilate data representing ATMS / CrIS
    • use RTM to simulate sensor-observed radiance, assimilate derived T and q profiles


Region Scale Nature Run (RSNR)



Data Assimilation Experiments (1)



Data Assimilation Experiments (2)





Regional Scale Nature Run (RSNR) with MM5

  • 9-km domain 521 × 553 × 30

  • 3-km domain 511 × 661 × 30

  • One-way nesting from 9- to 3-km grid

  • Initial and boundary conditions from ECMWF T799 NR

  • Integration period: 00 UTC 02 May to 00 UTC 04 May

  • Parameterizations:

    • simple ice microphysics
    • Blackadar PBL
    • Kain-Fritsch cumulus (9-km domain)
    • no cumulus scheme (3-km domain)






Sensitivity experiments with WRF

  • 3-km domain 511 × 661 × 30

  • Initial and boundary conditions from MM5 9-km [ regional nature run ]

  • One-way nesting from MM5 9-km grid

  • Integration period (cold start run): 00 UTC 02 May to 00 UTC 04 May

  • Parameterizations:

    • no cumulus scheme
    • simple ice microphysics
    • YSU PBL




Model background error calculation

    • background errors were calculated between successive 24-h WRF simulations initialized with ECMWF T799 data from April 12 – May 14
    • errors of a quantity are computed between different forecast cycles (Parrish & Derber 1992)
    • background errors used to calibrate the experimental WRF simulations


WRF 3DVAR Cycling and Simulation























Summary of Results & Discussions

  • Successful and fruitful collaboration with JCSDA and the International Joint OSSE Working Group (J-OSSE WG)

    • Access to ECMWF nature runs
    • Periodic WG meetings and discussions, including 2 formal presentation about the ATMS/CrIS OSSE and RSNR to the J-OSSE WG
    • 3 conference publications so far
  • Design, configuration, and synthesis of RSNR

    • New approach with many uncertainties; approach seems to be promising; and adds to the body of knowledge
  • Many challenges in using WRF 3DVAR being addressed systematically

  • Satisfactory level of progress

  • Still many uncertainties in adopting WRF radiance assimilation; code release behind schedule at NCAR. Will be ideal to use NCEP GSI; but requires steep learning curve & beyond scope (recommended for suture effort).



Summary of Progress

  • Completed Tasks

    • Mesoscale OSSE experimental design
    • Regional Scale Nature Run (RSNR - synthetic truth) using MM5
    • Retrieval of temperature (T) & dew point (Td) profiles
    • Control run using WRF
    • Data assimilation experiments using WRF-3DVAR
    • WRF background error estimation, necessary for 3DVAR assimilation
    • Assimilation of (synthetic) surface and upperair observations
    • Preliminary DA run using WRF-3DVAR
  • Final Steps (in progress)

    • Additional DA runs and validation of DA run(s)
    • Error analysis
    • Final evaluation (document and publish)


Thank You! Contact: Valentine Anantharaj



Схожі:

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconEvaluate visual signatures of supercell intensity/severity, structure, and movement in total lightning data used at wfo fwd

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconAlumli event 26. 02. 12 Talent Management

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconLecture 7 : Extrasolar Planets and Star Formation Robert Fisher

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconMaintenance and Dissipation of Mesoscale Convective Systems that Encounter the Great Lakes

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconH. E. S. S. Observations of the Galactic Center The H. E. S. S. Instrument

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconObservations on wafs gridded Forecasts

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconHigh Impact Event Steeple blown off church in Hickory, nc

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconEnsemble-based prediction and diagnostics during the predict field experiment

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconReview observations of summer monsoon precipitating systems Review observations of summer monsoon precipitating systems

A rapid Prototyping Capability Experiment to Evaluate Cris / atms observations for a Mesoscale Weather Event Robert Moorhead, Valentine G. iconFreezing rain event 14-15 December 2005 Central South Carolina Introduction


Додайте кнопку на своєму сайті:
dok.znaimo.com.ua


База даних захищена авторським правом ©dok.znaimo.com.ua 2013
звернутися до адміністрації
dok.znaimo.com.ua
Головна сторінка