The Effects of Meteorology on Ozone in Urban Areas and Their Use in Assessing Ozone Trends
Adequacy of Current Met Observations for Urban Dispersion Modeling Challenges in Urban Meteorology
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Adequacy of Current Met Observations for Adequacy of Current Met Observations for Urban Dispersion ModelingUrban Dispersion Modeling
Challenges in Urban MeteorologyChallenges in Urban MeteorologyPanel 3Panel 3
September 21, 2004September 21, 2004
Mr. Richard FryMr. Richard FryDTRA, Consequence Assessment BranchDTRA, Consequence Assessment Branch
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Making the World Safer
Observations – Surface
• WMO Reporting stations or opportunity• Hourly observations (WMO) or opportunity• Relatively dense network (over land)
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Making the World Safer
Observations – Upper Air• WMO RAOB stations or opportunity• 12-Hourly observations (WMO) or temporal opportunity• Relatively coarse network• Urban Soundings almost non-existent
Moisture Temp Wind
Surface
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Making the World Safer
Global and Mesonet Coverage
MesoWest Western US MesoWest Western US MesonetMesonet
WeatherFlow WeatherFlow US Coastal US Coastal
MesonetMesonet
•Standard WMO surface and upper air observations
•High resolution networks over limited geographic regions
•Provide enhanced detail in regions of complex coastline and/or terrain
Global Obs
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Making the World Safer
VDRAS and VLASFuture Capability
Wash.D.C.
Release height – 10m1 kg inert, nonbuoyant gas15 June 1998
16:00 LT release
16:30 LT release
Doppler radar
Doppler lidar
Regional scale (1km res)
Neighborhood scale (75m res)
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Making the World Safer
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