
Mixing of anthropogenic pollution with stratospheric ozone: A case study from the North Atlantic wintertime troposphere
Author(s) -
Parrish D. D.,
Holloway J. S.,
Jakoubek R.,
Trainer M.,
Ryerson T. B.,
Hübler G.,
Fehsenfeld F. C.,
Moody J. L.,
Cooper O. R.
Publication year - 2000
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000jd900291
Subject(s) - troposphere , environmental science , atmospheric sciences , climatology , stratosphere , pollution , air mass (solar energy) , ozone , oceanography , meteorology , geology , geography , boundary layer , ecology , physics , biology , thermodynamics
As part of the North Atlantic Regional Experiment (NARE), instrumentation for the measurement of O 3 and CO was included on research flights conducted by the National Oceanic and Atmospheric Administration WP‐3D Orion aircraft from St. John's, Newfoundland, Canada, and Keflavik, Iceland, from February 2 to 25, 1999. These flights sampled the lower troposphere over the western North Atlantic Ocean. One significant feature observed during these flights was the close proximity of air masses with contrasting source signatures: high levels of anthropogenic pollution immediately adjacent to elevated O 3 of stratospheric origin. Here we present a case study showing the most pronounced example of this proximity, which was associated with a frontal passage across North America and out into the North Atlantic region. Trajectory analyses and satellite imagery are used to investigate the transport mechanisms that create the interleaving of air masses from the different sources. One important chemical feature was noted: in air masses with differing amounts of anthropogenic pollution admixed, O 3 was negatively correlated with CO, which indicates that emissions from surface anthropogenic sources had reduced O 3 in this wintertime period, even in air masses transported into the free troposphere.