Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 33, Issue 1, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2005GL024975
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The observations during the Tropospheric Ozone Production about the Spring Equinox (TOPSE) experiment show large enhancements of NOx, PAN, O-3, CO, CFCs, and Halon-1211 in the upper troposphere over North America in late spring. Analysis of these observations and model results indicate that the enhancements are most likely driven by a surge of trans-Pacific pollutant transport in late spring. The rapid seasonal transition is particularly striking for upper tropospheric NOx, resulting in large increases in photochemical oxidation and O-3 production during the period. The transition is later in season than that of low-altitude trans-Pacific transport, which peaks in March and April. The current generation of global chemical transport models clearly underestimates this long-range transport of pollutants, implying an underestimation in the model-projected impact on regional air quality over North America ( through subsidence).
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