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Photochemical box modeling of long‐range transport from North America to Tenerife during the North Atlantic Regional Experiment (NARE) 1993
Author(s) -
Schultz M.,
Schmitt R.,
Thomas K.,
VolzThomas A.
Publication year - 1998
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 - 10.1029/97jd01481
Subject(s) - peroxyacetyl nitrate , ozone , environmental science , atmospheric sciences , range (aeronautics) , latitude , box model , climatology , descent (aeronautics) , meteorology , nox , chemistry , geology , physics , materials science , organic chemistry , geodesy , composite material , combustion
A photochemical trajectory model was used to reproduce the concentrations of several trace gases measured at Izaña/Tenerife during a selected episode of August 1993 with long‐range transport from the North American continent across the Atlantic Ocean. The set of initial conditions necessary to match the observations is analyzed and compared with available data in the literature. Initial and final concentrations of several hydrocarbons are in reasonable agreement with other measurements made at similar latitudes, and the CO/NO y and NMHC/NO y ratios are within the range of those observed from airborne measurements over the eastern United States and Canada. Important exceptions are the light olefines ethene and propene which may originate from oceanic emissions. The simulated concentration of ozone at Izaña is very similar to the initial concentration used, and there is no indication for photochemical net ozone production during long‐range transport. The abundance of NO x at the end of the simulation is largely due to decomposition of peroxyacetyl nitrate during the descent of the air before reaching Izaña. The results differ significantly from those of a steady state calculation which was made for comparison, and the height evolution of the trajectory was found to be a critical parameter. A parameter variation study revealed that significant net ozone production only occurs for very low initial ozone concentrations and/or NO y levels that are well above those observed during the period at Izaña at night. This study also emphasizes the important role of water vapor for the tropospheric ozone budget and the role ozone itself plays in its photochemical balance.

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