Ozone and nitrogen deposition from Colorado’s Craig
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Ozone and nitrogen deposition from Colorado’s Craig powerstation. NOx from Craig. The Craig powerstation is the largest uncontrolled NOx source in the state (~18k tons/ yr ) NPS is lobbying EPA for stricter controls (i.e., SCR on all three boilers) What is the impact in terms of . Ozone

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Ozone and nitrogen deposition from Colorado’s Craig powerstation

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Ozone and nitrogen deposition from colorado s craig powerstation

Ozone and nitrogen deposition from Colorado’s Craig powerstation


Nox from craig

NOx from Craig

  • The Craig powerstation is the largest uncontrolled NOx source in the state (~18k tons/yr)

  • NPS is lobbying EPA for stricter controls (i.e., SCR on all three boilers)

  • What is the impact in terms of

  • Ozone

  • Nitrogen dep

  • PM nitrate


Approach

Approach

  • Reduce NO and NO2 emissions from Craig w.r.t. three proposed scenarios

    • NPS option is most stringent with full SCR

      • Reduce NOx from ~18k tons/yr to ~3k tons/yr

  • Run CAMx for a year (2005) with 12km 4CAQTF inputs


Regional n dep from craig

Regional N dep from Craig


Romo n dep from craig

ROMO N dep from Craig


Peak ozone impacts from craig

Peak ozone impacts from Craig


Ozone from craig at flat tops wa

Ozone from Craig at Flat Tops WA


Voc vs nox from omi

VOC vs. NOx from OMI

HCHO and NO2 can be detected from the OMI satellite, and provide ‘indicator species’ to help assess whether a region is VOC or NOx limited.

HCHO/NO2 > 1

Suggests NOx limited

(Duncan et al., 2010)

HCHO

NO2

HCHO/NO2

Craig


Romo nitrate from craig

ROMO nitrate from Craig


Summary

Summary

  • Given VOC/NOx ratios in northwestern CO, NOx controls should be effective for reducing ozone, N dep, and haze

  • NOx emissions from O&G development in the region (Uintah, Piceance, and SW Wyo) are also a concern

    • Emissions at the surface: shorter transport?

    • This sector is growing, and NOx controls may be harder to apply


Summary cont d

Summary (cont’d)

  • The benefits from full SCR at Craig could be significant:

    • Ozone:

      • 2 – 6 ppb (8 hravrg) ozone reduction at Flat Tops WA

      • 1 – 2 ppb at ROMO

    • N dep:

      • 0.2 kg N/ha/yr reduction at Mt Zirkel

      • 0.14 kg N/ha/yr reduction at ROMO

    • PM nitrate:

      • 0.6 ug/m3 reduction at ROMO


Summary cont d1

Summary (cont’d)

  • Nitrate behavior seems a little strange

  • N dep at ROMO was ~linear w.r.t. to reductions

  • Next time should use plume-in-grid to better capture high NOx chemistry


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