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Adequacy of Current Met Observations for Urban Dispersion Modeling Challenges in Urban Meteorology

Adequacy of Current Met Observations for Urban Dispersion Modeling Challenges in Urban Meteorology Panel 3 September 21, 2004 Mr. Richard Fry DTRA, Consequence Assessment Branch. WMO Reporting stations or opportunity Hourly observations (WMO) or opportunity Relatively dense network (over land).

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Adequacy of Current Met Observations for Urban Dispersion Modeling Challenges in Urban Meteorology

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  1. Adequacy of Current Met Observations for Urban Dispersion ModelingChallenges in Urban Meteorology Panel 3September 21, 2004Mr. Richard FryDTRA, Consequence Assessment Branch

  2. WMO Reporting stations or opportunity Hourly observations (WMO) or opportunity Relatively dense network (over land) Observations – Surface

  3. WMO RAOB stations or opportunity 12-Hourly observations (WMO) or temporal opportunity Relatively coarse network Urban Soundings almost non-existent Observations – Upper Air Moisture Temp Wind Surface

  4. Global and Mesonet Coverage • Standard WMO surface and upper air observations Global Obs MesoWest Western US Mesonet • High resolution networks over limited geographic regions • Provide enhanced detail in regions of complex coastline and/or terrain WeatherFlow US Coastal Mesonet

  5. VDRAS and VLASFuture Capability Neighborhood scale (75m res) Regional scale (1km res) Wash. D.C. 16:30 LT release 16:00 LT release Release height – 10m 1 kg inert, nonbuoyant gas 15 June 1998 Doppler lidar Doppler radar

  6. Summary • Current Observation Systems of Limited Utility • Observations within Urban Canopy not useful for Urban Dispersion Models • Upper Air Soundings (SODAR, RAOB) and 4-D Data Assimilation (VLAS, VDRAS) show promise

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