Dependencies and sensitivity of tropospheric oxidants to precursor concentrations over the northeast United States: A model study

Technical Report · Fri May 20 04:00:00 EDT 1994

OSTI ID:7012238

Mathur, R; Schere, K L; Nathan, A

Several important issues related to the distribution and production of photochemical species are examined through an analysis of results obtained from applications of a comprehensive three-dimensional regional scale photochemical model over the northeast United States. The Regional Oxidant Model (ROM) is used to simulate the response of various photochemical species to specific anthropogenic emissions strategies involving NOx and hydrocarbon reductions for an episodic period during July 1988. Domain and temporal averages of predicted concentrations are examined for various species. Their relative influence on oxidant chemistry over the modeled domain is investigated. Further, spatial distributions of Ozone (O3) with respect to those of NOx, NOy, and hydrocarbons over the modeled domain are examined and the variations in O3 levels for different chemical regimes classified by characteristic NOx/ROG and NOx/NOy ratios are investigated. The relative benefits of reductions in NOx and hydrocarbon emissions on predicted O3 levels are also examined. In general, for this modeled domain, reductions in NOx emissions with or without reductions in hydrocarbon emissions have more impact on reducing predicted O3 levels compared to reductions only in hydrocarbon emissions.

• Research Organization: North Carolina Supercomputing Center, Research Triangle Park, NC (United Startes)
• OSTI ID: 7012238
• Report Number(s): PB-94-192770/XAB; CNN: EPA-R-816496
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
CHALCOGENIDES
CHEMICAL REACTIONS
EARTH ATMOSPHERE
ECOLOGICAL CONCENTRATION
EMISSION
GENERAL CIRCULATION MODELS
HYDROCARBONS
MATHEMATICAL MODELS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
THREE-DIMENSIONAL CALCULATIONS
TROPOSPHERE