2018 Responses to Domainwide SO2NOxNH3 Reductions

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2018 Responses to Domain-wide SO2/NOx/NH3
Reductions

• Talat Odman, Yongtao Hu, Alper Unal, and
• Ted Russell
• School of Civil Environmental Engineering
• Georgia Institute of Technology
• VISTAS Meeting
• August 25, 2004

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Overview

• 2018-OTB (B1) vs. 2018-OTW (B2a)
• Responses to 30 SO2/NOx/NH3 reductions
  Regional perspective
• OTB vs. OTW responses How different are they?
• PM2.5 response vs. extinction response
• Are the responses additive?
• Class I area vs. Urban area responses
• Site specific responses

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2018-OTW vs. 2018-OTB
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2018 OTB OTW Summary

• July
• SO4 is about 1/2 of PM2.5
• NO3 is very small
• OC is about 1/4 of PM2.5
• 2018-OTW SO4 is about 2/3 of 2018-OTB SO4
• 2018-OTW PM2.5 is about 25 less than 2018-OTB
  PM2.5
• January
• SO4 is small
• NO3 is about 1/3 of PM2.5
• OC is about 1/4 of PM2.5
• 2018-OTW NO3 is less than 2018-OTB SO4
• 2018-OTW PM2.5 is slightly less than 2018-OTB
  PM2.5

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July 17, 2018 OTB OTW
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SO4 (July)
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NO3 (July)
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OC (July)
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Jan. 5, 2018 OTB OTW
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SO4 (Jan.)
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NO3 (Jan.)
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OC (Jan.)
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Responses to 30 SO2/NOx/NH3 Reductions
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Response Summary

• July
• Regionally, SO2 control is the most effective
• SO4 responds almost linearly to SO2 reductions
• January
• Regionally, NH3 control is the most effective
• NO3 responds sub-linearly to NH3 reductions

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July 17
2018 OTB
30 SO2
30 NOx
30 NH3
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SO4 to 30 SO2 (July)
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Jan. 5
2018 OTB
30 SO2
30 NOx
30 NH3
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NO3 to 30 NH3 (Jan.)
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OTB vs. OTW Response
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Summary

• In general, OTB and OTW responses of PM2.5 are
  similar.
• This is more so for January when PM2.5 levels for
  OTB and OTW are much closer
• Responses are slightly larger for 2018-OTB
• Ranking of responses to different controls are
  very similar.

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PM2.5 Responses to 30 SO2 Reduction (July 17)
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PM2.5 Responses to 30 NH3 Reduction (Jan. 5)
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OTB OTW Responses at Shenandoah (July)
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OTB OTW Responses at Shenandoah (Jan.)
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OTB OTW Responses at Great Smoky Mountains
(July)
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OTB OTW Responses at Great Smoky Mountains
(Jan.)
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PM2.5 vs. Bext Response
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Summary

• July
• Bext responses to 30 NOx and 30 SO2 reductions
  are larger than PM2.5 responses to the same
  controls
• Bext response to 30 NH3 reduction is smaller
  than PM2.5 response to the same control
• Recall that Bext formula does not directly
  contain NH4
• January
• Bext responses are slightly larger than PM2.5
  responses

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PM2.5 and Bext at Shenandoah (July)
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PM2.5 and Bext at Shenandoah (Jan.)
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PM2.5 and Bext at Great Smoky Mountains (July)
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PM2.5 and Bext at Great Smoky Mountains (Jan.)
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Are the responses additive?
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Summary

• In general, responses to 30 SO2, NOx and NH3
  reductions are additive.
• Adding individual responses may slightly
  overestimate the combined response.

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NOx and NH3 Controls (Jan.)
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SO2, NOx and NH3 Controls (Jan.)
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Class I Area vs. Urban Area Responses
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Responses at Class I - Urban Area Pairs

• Looked at 4 pairs
• Cohotta Atlanta, GA
• Cape Romain Charleston, SC
• Great Smoky Mountains Knoxville, TN
• Dolly Sods - Charleston, WV
• Class I urban area pairs display similar
  responses.
• Relative response is generally larger in Class I
  area
• Ranking of responses to different controls is
  generally the same

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Cohotta-Atlanta Responses (July)
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Cohotta-Atlanta Responses (Jan.)
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Cape RomainCharleston Responses (July)
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Cape RomainCharleston Responses (Jan.)
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Great Smoky MountainsKnoxville Responses (July)
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Great Smoky MountainsKnoxville Responses (Jan.)
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Dolly Sods-Charleston, WV Responses (July)
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Dolly Sods-Charleston, WV Responses (Jan.)
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Site Specific Responses
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Conclusion

• 2018-OTW PM2.5 is about 25 less than 2018-OTB
  PM2.5 in July. The two are much closer in
  January.
• SO2 controls are most effective in July while NH3
  controls are most effective in January.
• OTB and OTW responses of PM2.5 are similar.
• PM2.5 and Bext responses are similar.
• Responses are generally additive.
• Responses at Class I urban area pairs are
  similar.
• Response magnitudes vary from site to site.