Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 6 2008 10.5194/acpd-8-19743-2008 http://www.atmos-chem-phys-discuss.net/8/19743/2008/ http://www.atmos-chem-phys-discuss.net/8/19743/2008/acpd-8-19743-2008.html http://www.atmos-chem-phys-discuss.net/8/19743/2008/acpd-8-19743-2008.pdf 19743 19789 2008-11-19 Synoptic influences on springtime tropospheric O₃ and CO over the North American export region observed by TES J. Hegarty jhegarty@ccrc.sr.unh.edu H. Mao R. Talbot Institute for the Study of Earth, Oceans and Space, Climate Change Research Center, University of New Hampshire, Durham, New Hampshire 03824, USA The relationship between synoptic circulation patterns over the western North Atlantic Ocean in spring (March, April, and May) and tropospheric O₃ and CO was investigated using retrievals from the Tropospheric Emission Spectrometer (TES) for 2005 and 2006. Seasonal composites of TES retrievals reprocessed to remove the artificial geographic structure added from the a priori revealed a channel of slightly elevated O₃ (&gt;55 ppbv) and CO (&gt;115 ppbv) at the 681 hPa retrieval level between 30&deg; N and 45&deg; N extending from North America out over the Atlantic Ocean. Ozone and CO in this region were correlated at <i>r</i>=0.32 with a slope value of 0.16 indicative of the overall impact of photochemical chemical processes in North American continental export. Composites of TES retrievals for the six predominant circulation patterns identified as map types from sea level pressure fields of the NCEP FNL analyses showed large variability in the distribution of tropospheric O₃. Map types featuring cyclones near the US east coast (MAM2–MAM5) produced the greatest export to the lower free troposphere with O₃>65 ppbv and O₃-CO slopes ranging 0.25–0.36. 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