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Comparing Modal and Sectional Approaches in Modeling Particulate Matter in Northern California K. Max Zhang 1, Jinyou Liang 2, Anthony S. Wexler 1 and.

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Presentation on theme: "Comparing Modal and Sectional Approaches in Modeling Particulate Matter in Northern California K. Max Zhang 1, Jinyou Liang 2, Anthony S. Wexler 1 and."— Presentation transcript:

1 Comparing Modal and Sectional Approaches in Modeling Particulate Matter in Northern California K. Max Zhang 1, Jinyou Liang 2, Anthony S. Wexler 1 and Ajith Kaduwela 1,2 1. University of California at Davis 2. California Air Resources Board

2 The CRPAQS EPISODE Domain covers Northern and Central CaliforniaDomain covers Northern and Central California An extended winter episode (12/25/2000- 1/7/2001)An extended winter episode (12/25/2000- 1/7/2001) Spinning up from 12/17/2000-12/24/2000Spinning up from 12/17/2000-12/24/2000 Analysis from 12/25/2000 – 1/7/2001Analysis from 12/25/2000 – 1/7/2001 185X185X15 with 4km by 4 km grid cell185X185X15 with 4km by 4 km grid cell

3 Anchor Sites BAC: Bakersfield (Urban)BAC: Bakersfield (Urban) FSF: Fresno (Urban)FSF: Fresno (Urban) ANGI: Angiola (Rural)ANGI: Angiola (Rural)

4 AJITH KADUWELA PRESENTS P ARTICULATE M ATTER M ODELING IN N ORTHERN C ALIFORNIA IN N ORTHERN C ALIFORNIA TIME: 4:00 PM, Wednesday, September 28 LOCATION: Grumman Auditorium

5 CMAQ-UCD vs. CMAQ EPA-CMAQCMAQ-UCD Composition representation Internally mixed Internally mixed (12 aerosol species) Gas-particle partition method Equilibrium Partitioning Fully dynamic partitioning with three mechanisms: Uncoupled; Coupled and Replacement Integration method N/A Asynchronous time-stepping (ATS) scheme Size distribution representation Modal with 2- 3 modes Sectional with 9 size sections spanning 0.03 to 20 μm Coarse particle nitrate None 3 'coarse' sections (> 2.5 μm) Sea-salt treatment Yes in v4.5 Explicit simulation of Na + and Cl - thermodynamics Source code access Open to public Open to public through CMAS in 2005/2006

6 Gas-phase Species (BAC)

7 Gas-phase Species (ANGI)

8 Gas-phase Species O3: CMAQ - CMAQ-UCD

9 NH 3 (g) and HNO 3 (g)

10 Primary Particulate Species OC: CMAQ - CMAQ-UCD

11 Primary Particulate Species

12 Secondary Particulate Species NO3: CMAQ - CMAQ-UCD

13 Secondary Particulate Species NO3: CMAQ - CMAQ-UCD

14 Secondary Particulate Species Jan 2

15 Secondary Particulate Species Dec 25 Jan 3 Dec 25 Jan 3 Dec 25 Jan 2Jan 3 Dec 25 Jan 2 Jan 3

16 Secondary Particulate Species

17 Summary Comparison between CMAQ and CMAQ-UCD at urban sites shows that gas and particle phases were close to equilibrium during CRPAQS. CMAQ model is competent for SIP simulations but phase-equilibrium may not hold in future less- polluted scenarios. Comparing sectional and modal approaches at rural sites poses challenges. CMAQ-UCD predicted less NO 3 and NH 4 on Dec 25, Jan 2 and Jan 3. N 2 O 5 ?

18 Acknowledgement California Air Resources BoardCalifornia Air Resources Board San Joaquin Valley Air Pollution Control DistrictSan Joaquin Valley Air Pollution Control District

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