C lark C ounty R egional O zone and P recursors S tudy (CCROPS)
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Transcript of C lark C ounty R egional O zone and P recursors S tudy (CCROPS)
Presentation to the Air Quality Forum – August 9, 2005
Clark County Regional Ozone and Precursors Study (CCROPS)
Robert A. Baxter, CCMT & B Systems, Inc.
Background
EPA issued the nonattainment designation for the 8-hour ozone NAAQS in 2004
Clark County DAQEM charged with preparation of attainment and maintenance plans
Characterization of ozone episodesKnowledge and understanding of various
meteorological and air quality conditions leading to exceedances
Ozone Studies
Emissions studies– Inventories
– Emissions
– Control measures
2004/2005 CCROPS– Ozone characterization study
– 2005 field study
CCROPS Objectives
Obtain a data set to help understand the origin of ozone and precursors
Assess the adequacy of the Clark County monitoring network to measure peak ozone
Obtain a data set of known quality for model validation
Generate a database for current and future SIP development
Provide recommendations for future research to support modeling of ozone
CCROPS MeasurementsUpper Air Meteorology
Radar wind profilerSodarsRawinsondesPilot balloonsGlider temperature
CCROPS MeasurementsSurface Ozone and Meteorology
Supplemental ozone measurements (10)
Boundary (2)Saturation ozone
measurements (13)
CCROPS MeasurementsSurface Ozone and Meteorology
Supplemental ozone measurements (10)
Boundary (2)Saturation ozone
measurements (13)
CCROPS MeasurementsSurface Ozone and Meteorology
Supplemental ozone measurements (10)
Boundary (2)Saturation ozone
measurements (13)
July 1 -- Aircraft Flight 0740 PDT Jean Sounding
0
500
1000
1500
2000
2500
3000
3500
4000
4500
0 10 20 30 40 50 60 70 80 90 100
Alt
itu
de
(m m
sl)
PM10 (ug/m3) Ozone (ppb) Temperature (C)
Ozone
Temperature
PM10
CCROPS MeasurementsPrecursor and Reactive Species
Volatile Organic Compounds (VOCs)Nitrogen species (NO2, PAN, NOy, Nitric
Acid)Enhanced DAQEM NO/NOx/NO2
Sampling Schedule
Study Period = May 1 – August 31Intensive Operational Periods (IOPs)
– May 15 – August 31– Four periods, 1 to 2 weeks in duration– Added rawinsondes and saturation ozone
Episodes– 15 forecasted days within IOPs– Added ozonesondes, VOCs and aircraft
What Have We Seen?
Ozone Patterns Similar from Characterization Study Years
Transport Scenarios Significant Ozone Production from
Regional Fires