April 2008 April 2008 Christopher M. Hill Patrick J. Fitzpatrick Christopher M. Hill Patrick J. Fitzpatrick Valentine G. Anantharaj Valentine G. Anantharaj Mississippi State University Mississippi State University Lars-Peter Riishojgaard Lars-Peter Riishojgaard Global Modeling and Assimilation Office / NASA Global Modeling and Assimilation Office / NASA Joint Center for Satellite Data Assimilation Joint Center for Satellite Data Assimilation An Observing System An Observing System Simulation Experiment to Simulation Experiment to Evaluate ATMS and CrIS Evaluate ATMS and CrIS Observations Observations
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April 2008 Christopher M. Hill Patrick J. Fitzpatrick Valentine G. Anantharaj Mississippi State University Lars-Peter Riishojgaard Global Modeling and.
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April 2008April 2008
Christopher M. Hill Patrick J. Fitzpatrick Valentine G. AnantharajChristopher M. Hill Patrick J. Fitzpatrick Valentine G. AnantharajMississippi State UniversityMississippi State University
Lars-Peter RiishojgaardLars-Peter RiishojgaardGlobal Modeling and Assimilation Office / NASAGlobal Modeling and Assimilation Office / NASA
Joint Center for Satellite Data AssimilationJoint Center for Satellite Data Assimilation
An Observing System Simulation An Observing System Simulation Experiment to Evaluate ATMS and Experiment to Evaluate ATMS and
CrIS ObservationsCrIS Observations
General Overview
• component sensors of NPOESS and NPP to include:component sensors of NPOESS and NPP to include:
– Advanced Technology Microwave Sounder (Advanced Technology Microwave Sounder (ATMSATMS))• across track scanning microwave radiometer• cross-track resolution: 1.5 km
– initial analyses tuned to model background errorsinitial analyses tuned to model background errors– use second model to avoid similarity in model error (fraternal twin problem)use second model to avoid similarity in model error (fraternal twin problem)
• investigate significant mesoscale weather events with preferred focus at investigate significant mesoscale weather events with preferred focus at the U.S. coast of the Gulf of Mexicothe U.S. coast of the Gulf of Mexico
– identified several case events through review of ECMWF NR outputidentified several case events through review of ECMWF NR output
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Case events identified from ECMWF T799 NRCase events identified from ECMWF T799 NR
May 2-4: squall line affecting all points along US Gulf coastMay 2-4: squall line affecting all points along US Gulf coast
May 7-8: decaying squall line over TXMay 7-8: decaying squall line over TX Oct 10-11: squall line / tropical waveOct 10-11: squall line / tropical wave
Case events from full resolution ECMWF T799 NRCase events from full resolution ECMWF T799 NR
May 2-4: squall line affecting all points along US Gulf coastMay 2-4: squall line affecting all points along US Gulf coast
May 7-8: decaying squall line over TXMay 7-8: decaying squall line over TX Oct 10-11: squall line / tropical waveOct 10-11: squall line / tropical wave
Mesoscale NRWRF v3.0 global gridWRF v3.0 global grid Global gridGlobal grid
• Initialized with ECMWF T511 NR dataInitialized with ECMWF T511 NR data• ∆∆x ~ 40 kmx ~ 40 km• New WRF global domain capabilityNew WRF global domain capability
– all synthetic data to be assimilatedall synthetic data to be assimilated– no boundary condition issueno boundary condition issue
• Integration periods surrounding case Integration periods surrounding case events:events:
– 27 September - 11 October27 September - 11 October– 23 April - 08 May (2 case events)23 April - 08 May (2 case events)
Regional nested gridRegional nested grid• broad domain centered over Gulfbroad domain centered over Gulf• ∆∆x ~ 14 km (x ~ 14 km (CrIS resolutionCrIS resolution))