Evaluations of NOx and highly reactive VOC emission inventories in Texas and their implications for ozone plume simulations during the Texas Air Quality Study 2006
Artikel i vetenskaplig tidskrift, 2011

Satellite and aircraft observations made during the 2006 Texas Air Quality Study (TexAQS) detected strong urban, industrial and power plant plumes in Texas. We simulated these plumes using the Weather Research and Forecasting-Chemistry (WRF-Chem) model with input from the US EPA's 2005 National Emission Inventory (NEI-2005), in order to evaluate emissions of nitrogen oxides (NOx = NO + NO2) and volatile organic compounds (VOCs) in the cities of Houston and Dallas-FortWorth. We compared the model results with satellite retrievals of tropospheric nitrogen dioxide (NO2) columns and airborne in-situ observations of several trace gases including NOx and a number of VOCs. The model and satellite NO2 columns agree well for regions with large power plants and for urban areas that are dominated by mobile sources, such as Dallas. How-ever, in Houston, where significant mobile, industrial, and inport marine vessel sources contribute to NOx emissions, the model NO2 columns are approximately 50 %-70 % higher than the satellite columns. Similar conclusions are drawn from comparisons of the model results with the TexAQS 2006 aircraft observations in Dallas and Houston. For Dallas plumes, the model-simulated NO2 showed good agreement with the aircraft observations. In contrast, the model-simulated NO2 is similar to 60 % higher than the aircraft observations in the Houston plumes. Further analysis indicates that the NEI-2005 NOx emissions over the Houston Ship Channel area are overestimated while the urban Houston NOx emissions are reasonably represented. The comparisons of model and aircraft observations confirm that highly reactive VOC emissions originating from industrial sources in Houston are underestimated in NEI-2005. The update of VOC emissions based on Solar Occultation Flux measurements during the field campaign leads to improved model simulations of ethylene, propylene, and formaldehyde. Reducing NOx emissions in the Houston Ship Channel and increasing highly reactive VOC emissions from the point sources in Houston improve the model's capability of simulating ozone (O-3) plumes observed by the NOAA WP-3D aircraft, although the deficiencies in the model O-3 simulations indicate that many challenges remain for a full understanding of the O-3 formation mechanisms in Houston.

campaign

houston

aerosol

ensemble

field

column retrieval

tropospheric no2

industrial emissions

organic-compounds

wrf model

monitoring instrument

Författare

S. W. Kim

University of Colorado at Boulder

National Oceanic and Atmospheric Administration

S. A. McKeen

University of Colorado at Boulder

National Oceanic and Atmospheric Administration

G. J. Frost

National Oceanic and Atmospheric Administration

University of Colorado at Boulder

S. H. Lee

University of Colorado at Boulder

National Oceanic and Atmospheric Administration

M. Trainer

National Oceanic and Atmospheric Administration

A. Richter

Universität Bremen

W. M. Angevine

University of Colorado at Boulder

National Oceanic and Atmospheric Administration

E. Atlas

Rosenstiel School of Marine and Atmospheric Science

L. Bianco

University of Colorado at Boulder

National Oceanic and Atmospheric Administration

K. F. Boersma

Royal Netherlands Meteorological Institute

Technische Universiteit Eindhoven

J. Brioude

National Oceanic and Atmospheric Administration

University of Colorado at Boulder

J. P. Burrows

Centre for Ecology & Hydrology

Universität Bremen

J. A. De Gouw

National Oceanic and Atmospheric Administration

University of Colorado at Boulder

A. Fried

National Center for Atmospheric Research

J. Gleason

NASA Goddard Space Flight Center

A. Hilboll

Universität Bremen

Johan Mellqvist

Chalmers, Rymd- och geovetenskap, Optisk fjärranalys

J. Peischl

National Oceanic and Atmospheric Administration

University of Colorado at Boulder

D. Richter

National Center for Atmospheric Research

Claudia Rivera

Chalmers, Rymd- och geovetenskap, Optisk fjärranalys

T. B. Ryerson

National Oceanic and Atmospheric Administration

S. T. L. Hekkert

Sensor Sense

J. G. Walega

National Center for Atmospheric Research

C. Warneke

National Oceanic and Atmospheric Administration

University of Colorado at Boulder

P. Weibring

National Center for Atmospheric Research

E. Williams

University of Colorado at Boulder

National Oceanic and Atmospheric Administration

Atmospheric Chemistry and Physics

1680-7316 (ISSN) 1680-7324 (eISSN)

Vol. 11 11361-11386

Ämneskategorier

Meteorologi och atmosfärforskning

DOI

10.5194/acp-11-11361-2011