Regional and Hemispheric Influences on Temporal Variability in Baseline Carbon Monoxide and Ozone over the Northeast US.

ABSTRACT: Interannual variability in baseline carbon monoxide (CO) and ozone (O₃), defined as mixing ratios under minimal influence of recent and local emissions, was studied for seven rural sites in the Northeast US over 2001 - 2010. Annual baseline CO exhibited statistically significant decreasing trends (-4.3 - -2.3 ppbv yr^-1), while baseline O₃ did not display trends at any site. In examining the data by season, wintertime and springtime baseline CO at the two highest sites (1.5 km and 2 km asl) did not experience significant trends. Decadal increasing trends (~2.55 ppbv yr^-1) were found in springtime and wintertime baseline O₃ in southern New Hampshire, which was associated with anthropogenic NO_x emission reductions from the urba

SUBMITTER: Zhou Y 

PROVIDER: S-EPMC6104834 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature