across track scanning microwave radiometer CIS CrIS Fourier transform spectrometer cross-track resolution: 14.0 km vertical resolution: ~ 3.
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1 A Rapid Prototyping Capability Experiment to Evaluate CrIS / ATMS Observations for Urban Modeling Applications (PI: Prof. Lori Bruce, Ph.D) Christopher M. Hill Patrick J. Fitzpatrick Valentine ae e G. Anantharaj a aj Mississippi State University Lars-Peter Riishojgaard Global Modeling and Assimilation Office / Joint Center for Satellite Data Assimilation 14 April 2008 NASA Review of MRC RPCs
2 Overview NPOESS to be launched in 2013 preceding NPOESS Preparatory Project (NPP) to be launched in 2009 component sensors of NPOESS and NPP to include: Advanced Technology Microwave Sounder (ATMS) Cross-track Infrared Sounder (CrIS)
3 Overview ATMS across track scanning microwave radiometer cross-track resolution: 1.5 km CIS CrIS Fourier transform spectrometer cross-track resolution: 14.0 km vertical resolution: ~ 3.0 km
4 OSSE Methodology
5 Configuration of Model Runs ECMWF NR grid High-resolution Nature Run (HRNR) Run performed by ECMWF Output administered by NCEP Global coverage T799 ( x ~ 25 km) Integration periods representing: 27 September November April May 2006 Image adopted from Shuttle Radar Topography Mission
6 Configuration of Model Runs ECMWF NR grid Regional (MM5) NR grid 60 N 0 Images adopted from Shuttle Radar Topography Mission
7 Configuration of Model Runs Regional-Scale Nature Run (RSNR) Regional (MM5) NR grid 60 N Run performed with MM5 ECMWF HRNR initial conditions broad domain centered over Gulf x ~ 9 km or 25 km integration periods as with HRNR 0 Image adopted from Shuttle Radar Topography Mission
8 Configuration of Model Runs Sensitivity experiments Regional (MM5) NR grid 60 N Runs performed with WRF RSNR as initial conditions x ~ 3 or 9 km domain focused on Gulf integration period of 48 h focus on mesoscale weather system Houston / Galveston North Central Gulf Coast Tampa Bay region Approximate Nested WRF grid 0 Image adopted from Shuttle Radar Topography Mission
9 Urban center study candidates Houston / Galveston Tampa Bay region North Central Gulf Coast Source: U.S. Census 2006 estimates
10 Configuration of Model Runs ECMWF NR grid Regional (MM5) NR grid 60 N Approximate Nested WRF grid 0 Images adopted from Shuttle Radar Topography Mission
11 Regional NR ECMWF NR grid (global) MM5 grid #1 ICs and BCs from ECMWF NR data two MM5 grids; one WRF nest MM5 grid #2 WRF grid MM5 grid #2 MM5 grid #1 ECMWF NR grid WRF grid ECMWF BC modified BC Houston / Galveston North Central Gulf Coast Tampa Bay region Grid #1 integration period O(weeks) to develop regional scale truth Grid #2, WRF grid integration period surrounding case events: h BCs perturbed across buffer grid #1 imperfect BCs input to nested ed grids WRF used for sensitivity tests impact of CrIS / ATMS studied for NR-simulated squall lines along the Gulf coast 11 Image adopted from Shuttle Radar Topography Mission
12 Recently considered ed approach - Mesoscale e NR WRF v3.0 global grid Global grid Initialized with ECMWF NR data New WRF global l domain capability assimilate global synthetic data no boundary condition issue Integration periods surrounding case events: 27 September - 11 October 23 April - 08 May (2 case events) Regional nested grid broad domain centered over Gulf integration periods: case event duration (48-72 h) WRF regional grid extra Images adopted from Shuttle Radar Topography Mission
13 Relevant ee tdata assimilation at & modeling work at MSU Impact of NEXRAD data quantified through analysis of model background errors errors of a quantity computed between different forecast cycles (Parrish & Derber 1992) 12 UTC (Day 1) 00 UTC (Day 2) 12 UTC (Day 2) 00 UTC (Day 3) 00 UTC (Day 1) 12h forecast 24h forecast UTC (Day 1) o 12h forecast 24h forecast - 00 UTC (Day 2) x 24h-12h error 12h forecast 24h forecast 12 UTC (Day 2) x x 24h-12h error 12h forecast 00 UTC (Day 3) x x x 24h-12h error within our OSSE effort: model background error analysis will be used to calibrate free-running running simulations (i.e. nature runs) that assimilate synthetic observations and data representing ATMS /CrIS 13
14 Relatable data assimilation & modeling work F03h F09h F12h 14 w/ NEX XRAD w/ stand dard obs. observed
15 Case Events Identified ed from ECMWF HRNR May 2-4: squall line affecting all points along US Gulf coast MSLP (hpa) 3-h convective precipitation (mm). May 7-8: decaying squall line over TX Oct 10-11: 11: squall line / tropical wave 15
16 Status of MSU OSSE Progress to date HRNR data ready for OSSE HRNR assessment yields cases RSNR Requirements for OSSE synthetic observations simulated ATMS / CrIS CISd data Next step is to conduct RSNR (ATMS / CrIS) MM5/WRF The OSSE should be completed within 12 months Present OSSE could serve as model for future for future OSSE activities at MSU 16
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