PM Study Status Report Policy Committee Meeting November 7, 2003
Presentation Overview l CRPAQS Symposium Highlights l Modeling Proposal Review l Consent Calendar Items
CRPAQS AAAR Symposium Highlights l l 9 talks and 10 posters were presented at the AAAR conference Common themes of presentations: 4 Episodes are prolonged, widespread, dominated by PM 2. 5 4 Meteorology is stagnant, limited mixing 4 Ammonium nitrate and carbon are major constituents 4 Role of wood smoke contributions 4 Initial modeling results
Episode Strength and Duration
PM Episodes and Duration
PM 2. 5 Concentrations January 4 -7, 2001 SRF BTI S 13 SOH LVR 1 PAC SNFH HELM FSF KCW FEL BAC
Winter 24 -hour bsp vs. PM 2. 5 Filter Mass November through April data from sites in the San Joaquin Valley • Strong correlation (R 2 = 0. 88) during the winter, the season when PM 2. 5 concentrations are highest. • The 24 -hour Federal PM 2. 5 standard, 65 µg/m 3, is exceeded often in the data shown. • Average scattering efficiency of 4. 6+0. 07 m 2/g.
Meteorological Factors
Summary of CART Analysis Meteorological Variables Influencing PM Concentrations l Winter Analysis 4 l In winter, there is a dependence on stability, relative humidity, and minimum temperature Fall Analysis 4 In fall, stability is most important; there appears to be no dependence on wind speeds
Case Study Example – Mixing Depth vs. PM 2. 5 Hourly PM 2. 5 Concentration at Fresno (FSF) and Mixing Depth at Chowchilla Day Night Day
Major PM Constituents
PM 2. 5 Concentrations Bakersfield-Residential
PM 2. 5 Ammonium Nitrate January 1, 4, 5, 6, and 7, 2001 BTI Legend LVR 1 M 14 FREM SELM COP BRES
PM 2. 5 Total Carbon January 1, 4, 5, 6, and 7, 2001 BTI LVR 1 Legend M 14 FREM SELM COP BRES
PM 2. 5 Chemical Composition Average for 10 Exceedance Days
PM Constituent Contributions to Light Extinction
Wet Deposition of PM Constituents During Fog Events
Wood Combustion Contributions
Kveg Concentrations at Three Fresno Sites Large Temporal Variation/Small Spatial Variation
Aerosol Time of Flight (ATOFMS) Data ATOFMS Counts PAH mass PAH and Biomass Particles: January 9 -February 4, 2001 Date/Time
Preliminary IMS 95 Modeling
Regional PM 10 Performance Measured (Blue), Modeled (Black) Jan 04 Jan 05 Jan 06
PM 2. 5 Source Contributions from IMS 95 Modeling Max scale 32 µg/m 3 Max scale 10 µg/m 3
PM 2. 5 Nitrate Isopleths at Fresno
Acknowledgements l l l Rich Hackney, Theresa Najita, Kasia Turkiewicz, ARB Sonoma Technology Desert Research Institute Colorado State University ENSR Corporation Aerosol Dynamics Technical & Business Systems Tracer Technology RJ Lee Group U. C. San Diego U. C. Davis
Modeling Proposal Review l RFP released July 29, 2003 l RFP contains 8 tasks (1 already funded) l l Budget is $750, 000 Work will be carried out over 24 months 7 proposals submitted September 10, 2003 TC has reviewed proposals and prepared recommendations
Modeling Proposal Review Issues l l l Initial costs greater than budget available Focus on episodic base case, performance evaluation, and control strategy evaluation Pursue two air quality modeling approaches Tasks dealing with emissions evaluation, boundary conditions, annual modeling, and visibility assessment will need to be addressed through data analysis, in-house efforts Limited funding is available for modeling wrap-up and integration
Modeling Proposals Contractor Recommendations Contractor Task(s) Funding Sonoma Technology Meteorological modeling $124, 948 U. C. Davis Air quality modeling $ AER Air quality modeling $271, 000 Envair (Steve Reynolds) Performance evaluation (phase 1) TOTAL tbd $ 11, 780 ~$750, 000
CRPAQS Consent Calendar l l l Surplus Computer Equipment Fresno Wood Smoke Sample Analysis Data Analysis Contract Extensions
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