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1997 Southern California Ozone-NARSTO Study: Preparation of the 1997 Gridded Emission Inventory

1997 Southern California Ozone-NARSTO Study: Preparation of the 1997 Gridded Emission Inventory. Dale Shimp SCOS97-NARSTO Conference Presentation February 14, 2001. INTRODUCTION. Comprehensive emission inventory for the entire SCOS97 domain Large study domain with multiple agencies

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1997 Southern California Ozone-NARSTO Study: Preparation of the 1997 Gridded Emission Inventory

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  1. 1997 Southern California Ozone-NARSTO Study: Preparation of the 1997 Gridded Emission Inventory Dale Shimp SCOS97-NARSTO Conference Presentation February 14, 2001

  2. INTRODUCTION • Comprehensive emission inventory for the entire SCOS97 domain • Large study domain with multiple agencies • Inventory to be used for both SCOS97 study and Southern California air quality plans • Need for hourly, daily emission inventory data • Built upon lessons learned from past studies

  3. LESSIONS FROM EARLIER STUDIES • Need for day-specific traffic data to answer hour-of-day/day-of-week activity issues • Improved information on off-road mobile sources especially ships and aircraft • Improved biogenic emission inventory

  4. LESSIONS FROM EARLIER STUDIES • Development of updated and improved spatial allocation factors • Stack and locational information often incomplete or missing

  5. ORGANIZING THE PROCESS • Identify responsible agencies and contractors • Emission Inventory Working Group (EIWG) • Identify annual average and day-specific data needs

  6. EIWG Members • California Air Resources Board • Local Air Pollution Control Agencies • United States EPA • United States Navy

  7. ROLE OF EIWG • Emission Inventory Collection and Reporting • Define Inventory Needs • Technical Support Group • Quality Assurance • Keep Project on Schedule

  8. DAY-SPECIFIC INFORMATION • Stationary Sources • On-Road Mobile Sources • Off-Road Mobile Sources • Non-Anthropogenic Sources

  9. ROLES & RESPONSIBILITIES

  10. DAY-SPECIFIC INFORMATIONCOLLECTION • Collect hourly, day-specific emission data from stationary sources • Collect hourly motor vehicle traffic count information on major state highways • Collect hourly aircraft activity data

  11. DAY-SPECIFIC INFORMATIONCOLLECTION (continued) • Collect hourly ship activity data at ports • Collect daily wildfire information • Develop a comprehensive biogenic inventory for the entire SCOS97 study domain

  12. MODELING EMISSION INVENTORY DEVELOPMENT Adopted a two-tier approach to the development of the modeling emission inventory • First Tier - will provide modelers with a “fast-track” inventory based on annual average data • Second Tier - will provide modelers with a “final” inventory with all day-specific data

  13. FAST-TRACK EMISSION INVENTORY • Preliminary Domain-Wide Modeling Inventory • 1996 Annual Average Emission Inventory • Day-Specific Wildfire Information • Used to Test Model Performance

  14. FINAL EMISSION INVENTORY • Integration of Day-Specific Information • Application of 1997 Spatial Surrogates • Weekend Inventories • Future Year Inventories

  15. SUMMARY • Key to success was hard work and interagency cooperation • Regular EIWG meetings minimized problems and misunderstandings and helped maintain schedule • Proactive problem solving approach by focusing on inventory deficiencies from earlier studies • Adopted a two-tier approach for developing a modeling emission inventory

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