neighborhood scale monitoring and source attribution of air toxics during bee-tex 2014 by eduardo...
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8/12/2019 Neighborhood Scale Monitoring and Source Attribution of Air Toxics during BEE-TEX 2014 by Eduardo (Jay) Olague
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Neighborhood Scale Monitoring andSource Attribution of Air Toxics
during BEE-TEX 2014
Eduardo (Jay) Olaguer, Ph.D.
Program Director, Air Quality Science
Houston Advanced Research Center
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BEE-TEX Field Study
The Benzene and other ToxicsExposure (BEE-TEX) Study is a fieldstudy of human exposure to andsource attribution of the air toxics:benzene, toluene, ethyl benzene andxylenes (BTEX), plus other HAPs (e.g.,
formaldehyde, 1,3-butadiene).
The study will be conducted in theHouston Ship Channel neighborhoodsof Manchester, Galena Park, andMilby Park in the spring of 2014.
The study costs about $1 million andis funded by the U.S. Fish & Wildlife,Coastal Impact Assistance Program(CIAP) through Harris County, Texas.
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BEE-TEX Methodologies
Computer-Aided Tomography (CAT) scans
based on Differential Optical Absorption
Spectroscopy (DOAS) remote sensing.
Real-time mobile monitoring.
Portable cultured human lung cells.
HARC micro-scale 3D Eulerian chemicaltransport model for source attribution and
CAT plume reconstruction.
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Long Path DOAS
Measures total amount ofsubstance over a longpath using visible or UVlight absorption.
BTEX spectra below 290nm, so cannot usesunlight. Must useartificial light source.
Maximum path length
obtained using bi-staticconfiguration (no retro-reflectors) with LED lightsources opposite detector.
4.1 km 5.08 km
5.15 km
70m
300m
130m
20m
Moody
Tower
LP-DOAS
Downtown
Houston
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Computer-Aided Tomography
CAT-DOAS withmultiple light paths
can be used to
derive spatiallyresolved ambient
concentrations (not
just path averages)over an entire
neighborhood.
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AERODYNE MOBILE LABORATORY
Real-time measurement capabilities:CO, CO2, O3, HCHO, VOCs, NOx, PM
Wind speed & direction, temperature, humidity
SCIPUFF DISPERSION MODELComplex wind flows
Forward mode
Inverse mode (AIMS)
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Cultured Lung Cells
UNC will deploy in vitro technique for one
week during the BEE-TEX campaign.
Living lung cells will be exposed to polluted air
delivered across an air-liquid interface.
Cell toxicity & inflammation measured based
on releases of specific proteins and enzymes.
Cell responses may indicate exposure to
specific classes of pollutants (e.g., aldehydes).
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HARC Air Quality Model
Neighborhood scale 3D dispersion model with itsown chemical mechanism (47 gas phase reactions).
Very high temporal (~20 s) and horizontal (~200 m)
resolution. (Note: SIP models for Houston have at
best 4 km horizontal resolution.)
Model can infer emissions from observed ambientconcentrations (inverse mode) as well as to predict
concentrations from emissions (forward mode).
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Modeling for BEE-TEX
HARC model will be used to optimize CAT
reconstructions for HAPS.
Inverse modeling will also be performed based
on CAT and Aerodyne mobile lab data.
QUIC model with NGA 3D building database
will enhance model source attribution.
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Computational Fluid Dynamics
QUIC model used to simulate wind based on 3D LIDAR building morphology.
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Formaldehyde Source Attribution
for a Texas Refinery
Winds from QUIC model
HARC model with chemistry (200
m, 20 s resolution) run in inverse
mode based on mobile lab
measurements
Emissions attributed primarily to
fluidized cat cracking and
desulfurization operations
HCHO results agree with I-DOAS
emission flux measurements for
target upwind sources (18 kg/hr)
Olaguer, et al. (2013),J. Geophys. Res.-Atmos., 118, 11,317
11,326.
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BEE-TEX Web Portal
General information available at:
http://maps.harc.edu/beetex/About.aspx.
Graphic display of emission inventory at:
http://maps.harc.edu/beetex/.
http://maps.harc.edu/beetex/About.aspxhttp://maps.harc.edu/beetex/http://maps.harc.edu/beetex/http://maps.harc.edu/beetex/About.aspx -
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Conclusion
BEE-TEX will test new monitoring and modelingtechniques that potentially yield more detailedand accurate information on ambient exposure to
and source attribution of air toxics. BEE-TEX will benefit industry, regulators, and
fence line communities by providing better toolsfor LDAR, permitting, and emissions reporting.
HARC is willing to work collaboratively with allstakeholders to ensure the quality and success ofthe BEE-TEX campaign.
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