U. Shankar 1 , B. Henderson 2 , S. Arunachalam 1 , Z. Adelman 1 , N. Davis 1 , L. Ran 1 , E. Adams 1 , M. Barna 3 , and M. Rodriguez 3 8th Annual CMAS Conference Chapel Hill, NC, October 19-21, 2009 1 UNC – Institute for the Environment 2 UNC Department of Environmental Sciences and Engineering 3 National Park Service
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U. Shankar 1 , B. Henderson 2 , S. Arunachalam 1 ,
Evaluation of CMAQ Performance During the Rocky Mountain Atmospheric Nitrogen and Sulfur (RoMANS) Study. U. Shankar 1 , B. Henderson 2 , S. Arunachalam 1 , Z. Adelman 1 , N. Davis 1 , L. Ran 1 , E. Adams 1 , M. Barna 3 , and M. Rodriguez 3 8th Annual CMAS Conference - PowerPoint PPT Presentation
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U. Shankar1, B. Henderson2, S. Arunachalam1,
Z. Adelman1, N. Davis1, L. Ran1, E. Adams1, M. Barna3, and
M. Rodriguez3
8th Annual CMAS Conference
Chapel Hill, NC, October 19-21, 20091 UNC – Institute for the Environment
2 UNC Department of Environmental Sciences and Engineering
3 National Park Service
● RoMANS Field Campaign Overview● Context for Modeling Study● Model Setup● Current Results ● Conclusions● Next Steps
● Goal: To reduce deleterious effects on sensitive ecosystems due to atmospheric sulfur and nitrogen compounds
●Current estimate of inorganic N wet dep + dry dep of HNO3, NO3 and NH4 ≈ 4 kg/ha/yr
●20-fold increase since Western pre-industrial values● Objectives
● Identify S/N mix, ambient and deposited, on both sides of Continental Divide
● Identify important sources and transport pathways within and outside Colorado responsible for the S/N in Rocky Mountain National Park
● Identify relative contributions of different source types within Colorado to S/N species observed
● Observation period was aimed at capturing the seasonality in meteorology, and understanding S/N source contributions and chemistry
●Spring 2006: March 25 – April 30 (season for upslope, synoptic storms)
●Summer 2006: July 6 – August 12 (convective precip)
● Measurements at high temporal frequency to resolve changes in pollutant transport patterns and identify source types
RoMANS Measurements- Chemistry
Measured daily at 8 sites in spring, 6 sites in summer, and sub-hourly at core site, collocated w/ IMPROVE monitor; PM size measured at core site
Gore Pass
Lyons CrestCore Site 10-m Tower
Larimer CountyJackson County
Grand County Boulder County
Routt County
Wyoming
Colorado
Meteorology Monitoring Locations - ROMANS Study
Radar Profiler
Granby Sodar
Distances from Core Site:
to Estes Park Radar Profiler = 12 Km to Lyons = 24 Km
to Granby SODAR = 37 Km
to Gore Pass = 86 Km
Measured winds, precip, temperature, RH and light scattering
● Initial modeling of RoMANS by NPS using CAMx found severe underprediction of (gas and particulate) ammonia● Suspected emissions, dry dep of NH3
● Under a NASA ROSES UNC needed a demo application of the pyPA tool soon that it would port to VIEWS (End users: WRAP, NPS, …)
● Opportunity for a diagnostic evaluation of CMAQ against RoMANS and an inter-model comparison
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ALVC BEME BRUS DINO GOPA GRAN LYCR ROMO SPRI TICR
Site
Me
an
Fra
ctio
na
l Err
or
Spring
Summer
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-1.5
-1
-0.5
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ALVC BEME BRUS DINO GOPA GRAN LYCR ROMO SPRI TICR
Site
Mea
n Fr
actio
nal B
ias
Spring
Summer
NH4 Mean Fractional Error NH4 Mean Fractional Bias