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Ozone and nitrogen deposition from Colorado’s Craig Ozone and nitrogen deposition from Colorado’s Craig

Ozone and nitrogen deposition from Colorado’s Craig - PowerPoint Presentation

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Ozone and nitrogen deposition from Colorado’s Craig - PPT Presentation

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 ie SCR on all three boilers ID: 808865

nox craig dep ozone craig nox ozone dep romo nitrate reduction voc summary controls no2 tons tops flat full

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Presentation Transcript

Slide1

Ozone and nitrogen deposition from Colorado’s Craig

powerstation

Slide2

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

Slide3

Approach

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

NPS option is most stringent with full SCRReduce NOx from ~18k tons/yr to ~3k tons/yrRun CAMx

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

Slide4

Regional N

dep

from Craig

Slide5

ROMO N

dep

from Craig

Slide6

Peak ozone impacts from Craig

Slide7

Ozone from Craig at Flat Tops WA

Slide8

VOC vs.

NOx

from OMIHCHONO2HCHO/NO2HCHO 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 > 1Suggests NOx limited(Duncan et al., 2010)

Craig

Slide9

ROMO nitrate from Craig

Slide10

Summary

Given VOC/

NOx ratios in northwestern CO, NOx controls should be effective for reducing ozone, N dep, and hazeNOx emissions from O&G development in the region (Uintah, Piceance, and SW

Wyo) are also a concernEmissions at the surface: shorter transport?This sector is growing, and NOx controls may be harder to apply

Slide11

Summary (cont’d)

The benefits from full SCR at Craig could be significant:

Ozone:2 – 6 ppb (8 hr avrg) ozone reduction at Flat Tops WA1 – 2 ppb at ROMON 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

Slide12

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