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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 110, D12303, doi:10.1029/2004JD005485, 2005

Evaluating the contribution of changes in isoprene emissions to surface ozone trends over the eastern United States

Arlene M. Fiore

Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, New Jersey, USA


Larry W. Horowitz

Geophysical Fluid Dynamics Laboratory (GFDL), National Oceanic and Atmospheric Administration (NOAA), Princeton, New Jersey, USA


Drew W. Purves

Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, USA


Hiram Levy II

Geophysical Fluid Dynamics Laboratory (GFDL), National Oceanic and Atmospheric Administration (NOAA), Princeton, New Jersey, USA


Mathew J. Evans

School of the Environment, University of Leeds, Leeds, UK


Yuxuan Wang

Department of Earth and Planetary Sciences and Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA


Qinbin Li

Jet Propulsion Laboratory (JPL), National Aeronautics and Space Administration (NASA), California Institute of Technology, Pasadena, California, USA


Robert M. Yantosca

Department of Earth and Planetary Sciences and Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA


Abstract

Reducing surface ozone (O3) to concentrations in compliance with the national air quality standard has proven to be challenging, despite tighter controls on O3 precursor emissions over the past few decades. New evidence indicates that isoprene emissions changed considerably from the mid-1980s to the mid-1990s owing to land-use changes in the eastern United States (Purves et al., 2004). Over this period, U.S. anthropogenic VOC (AVOC) emissions decreased substantially. Here we apply two chemical transport models (GEOS-CHEM and MOZART-2) to test the hypothesis, put forth by Purves et al. (2004), that the absence of decreasing O3 trends over much of the eastern United States may reflect a balance between increases in isoprene emissions and decreases in AVOC emissions. We find little evidence for this hypothesis; over most of the domain, mean July afternoon (1300–1700 local time) surface O3 is more responsive (ranging from −9 to +7 ppbv) to the reported changes in anthropogenic NOx emissions than to the concurrent isoprene (−2 to +2 ppbv) or AVOC (−2 to 0 ppbv) emission changes. The estimated magnitude of the O3 response to anthropogenic NOx emission changes, however, depends on the base isoprene emission inventory used in the model. The combined effect of the reported changes in eastern U.S. anthropogenic plus biogenic emissions is insufficient to explain observed changes in mean July afternoon surface O3 concentrations, suggesting a possible role for decadal changes in meteorology, hemispheric background O3, or subgrid-scale chemistry. We demonstrate that two major uncertainties, the base isoprene emission inventory and the fate of isoprene nitrates (which influence surface O3 in the model by −15 to +4 and +4 to +12 ppbv, respectively), preclude a well-constrained quantification of the present-day contribution of biogenic or anthropogenic emissions to surface O3 concentrations, particularly in the high-isoprene-emitting southeastern United States. Better constraints on isoprene emissions and chemistry are needed to quantitatively address the role of isoprene in eastern U.S. air quality.

Received 1 October 2004; accepted 11 March 2005; published 30 June 2005.

Keywords: isoprene; ozone; air pollution; ozone trends; emissions trends; biogenic emissions.

Index Terms: 0315 Atmospheric Composition and Structure: Biosphere/atmosphere interactions (0426, 1610); 0345 Atmospheric Composition and Structure: Pollution: urban and regional (0305, 0478, 4251); 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry; 0426 Biogeosciences: Biosphere/atmosphere interactions (0315); 0478 Biogeosciences: Pollution: urban, regional and global (0345, 4251).

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Citation: Fiore, A. M., L. W. Horowitz, D. W. Purves, H. Levy II, M. J. Evans, Y. Wang, Q. Li, and R. M. Yantosca (2005), Evaluating the contribution of changes in isoprene emissions to surface ozone trends over the eastern United States, J. Geophys. Res., 110, D12303, doi:10.1029/2004JD005485.