CALGRID Modeling Overview A First Look A Modeling Effort by the OTC Modeling Committee Presented by: Jeffrey Underhill, Ph.D. NHDES OTC/MANE-VU Annual.

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Presentation transcript:

CALGRID Modeling Overview A First Look A Modeling Effort by the OTC Modeling Committee Presented by: Jeffrey Underhill, Ph.D. NHDES OTC/MANE-VU Annual Meeting Philadelphia, PA July 21-23, 2003

Project Goals 1.Enhance modeling capabilities for states of the OTR. 2.Screen emission control strategies for urban and regional attainment 3.Test and study EPA’s Clear Skies multi-P modeling and assumptions 4.Cross-compare other proposed multi-P Bills

Background: 2010 vs OTC Modeling focuses on 2010 benefits. The vast majority of the 8-hour ozone nonattainment areas in the northeast will have attainment dates of Further, there are still 1-hour ozone nonattainment areas with attainment dates of 2007 and PM2.5 attainment dates are also in the same timeframe. Clear Skies has benefits in 2010 but focuses heavily on the 2020 benefits, which are 10 years too late for attainment needs. –Should the health benefits wait 10 additional years?

Note: All modeling files were provided from EPA as modeled for CSI of OTC did not create the files, only reformatted files for use with the CALGRID model. Other Multi-P bills presented here today are approximated base on relativity to CSI 2010 files.

Modeling Episodes Ozone June 12-24, 1995 June 12-24, 1995 (in progress) July 5-15, 1995 July 5-15, 1995 (in progress) May 15-September 15, 1996 (August 2003) PM2.5 Annual 1996 (Fall 2003)

Ozone Modeling Concentrations - CSI June 1995 Episode

Ozone Modeling Concentrations July 1995 Episode 2010 Clean Air Act

2010 CAA vs CSI 8-Hour Ozone Modeling Concentrations for June 1995 Episode Clean Air ActClear Skies

2010 CAA vs CSI 8-Hour Ozone Modeling Concentrations for July 1995 Episode Clean Air ActClear Skies

2010 CSI Improvement from CAA

2020 Base Case minus CSI – June 1995

2010 Base Case minus CSI – July 1995

2020 Base Case minus CSI – July 1995

Transport After CSI 2010

Clear Skies 2010 Ozone Nonattainment Source: EPA, Counties better than 2010 Clean Air Act Conditions

3 Counties better than 2020 Clean Air Act Conditions Source: EPA, 2003 Clear Skies 2020 Ozone Nonattainment

CSI 2002 vs. CSI 2003 “…Clear Skies’ health benefits are higher than previously estimated.” EPA, 2003 But CSA 2003 moves 2 states from the East Zone to the West, but does not shift the emissions caps. –Allows NOx emissions in East to increase by about 7% in 2010 over CSI of 2002 –Allows NOx emissions in East to increase by about 9% in 2020 over CSI of 2002 ?But if emissions are up, why more benefits???

Tipping the Scales 1.New census data increases exposed population versus previous version. 2.Changes in design value monitoring years applied, shifts calculations from worst case to best case.  Lowers the bar for passing the attainment test  Justified by growing emissions to interim/hybrid emission inventory year and most recent year available  But is most recent year typical?

How Do the Years Compare? Worst Case Best Case

8-Hour Ozone Design Values 1997 – 1999 DV1999 – 2001 DV Worst Case vs. Best Case ▲ 100 (ppb)

OTC Modeling Uses a different model (CALGRID) to cross-check EPA’s modeling (CAMx). CALGRID model performance is comparable to that of CAMx and maybe a little better along the northeast corridor. –Sophisticated model –Emission adjustment routines simplified for throughput Follows EPA Guidance by using worst-case design values from and (episode and emission years). Included because EPA used it in CSI of 2002.

Preliminary Modeling Results The following modeling results are adjusted based on a modified Relative Reduction Factor as recommended by EPA guidance. –The OTC modification simplifies the application of the calculations without biasing the results.

Modeling results presented today are based on the June 1995 episode. Final modeling results will include the July 1995 episode and seasonal modeling for summer –Seasonal modeling will for the first time look at episodes that weren’t selected for severe 1-hour ozone peaks. A truer test. Preliminary Modeling Results

Comparison of Multi-P Bills for NOx

CAA 2010 (Adjusted) ▲ 100 (ppb) Preliminary: Based on June 1995 Episode

CSI 2010 (Adjusted) ▲ 100 (ppb) Preliminary: Based on June 1995 Episode

Carper 2010 (Adjusted) ▲ 100 (ppb) Preliminary: Based on June 1995 Episode

Jeffords 2010 (Adjusted) ▲ 100 (ppb) Preliminary: Based on June 1995 Episode

OTC # (Adjusted) ▲ 100 (ppb) Preliminary: Based on June 1995 Episode

OTC # (Adjusted) ▲ 100 (ppb) Preliminary: Based on June 1995 Episode

CSI Plus 25% Area & Mobile 2010 (Adjusted) ▲ 100 (ppb) Preliminary: Based on June 1995 Episode

Comparison of Modeling for 2010 # of OTR Monitors CAACSI 2002 Carper (approx) Jeffords (approx) OTC #1 (EGU =0.11 lb/MmBtu ) OTC #2 (All Pts =0.11 lb/MmBtu ) CSI +25% Area & Mobile Good ▲ Fair ▲ Marginal ▲ Unhealthy S/G ▲ Unhealthy ▲ Very Unhealthy ▲ Preliminary: Based on June 1995 Episode

Summary of Proposals Preliminary: Based on June 1995 Episode

Other Issues: New “Safety Valve” feature where sources can borrow against the next year’s emissions, provides certainty for industry but uncertainty for states and their SIPs. –What can states count on for their SIPs? –Borrowing during critical years can actually knock-back reaching attainment by a year.

Costs and Benefits Costs: $6.3 Billion in 2020 $4.3 Billion in 2010 Benefits:$110 Billion in 2020 $53 Billion in 2010 Visibility benefits add another $3 Billion per year in 2020 ($1 Billion in 2010).

Summary It is troubling that Clear Skies technical summaries seem so focused on the 2020 benefits when attainment dates are around 2010 and the 2020 emission reductions are not locked-in. OTC modeling shows “Substantial” ozone nonattinment continuing after the 2010 attainment dates. Leaving what is left in ozone nonattainment to “local controls” is troubling when many of the most effective local controls are restricted at the federal level.

A Parting Thought Frequent Footnotes in CSA-2003 technical summaries: “Additional federal and state programs must bring all counties into attainment by 2016 at the latest.” If so, how do the heavily promoted 2020 Phase 2 CSA emission reductions fit in for ozone?

Questions And Discussion