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• W2109096504 abstract "Aircraft measurements of ozone (O 3 ) and its precursors, including NO, CO, H 2 O, and nonmethane hydrocarbons (NMHCs), were made over the western Pacific in the 20°– 45°N latitude range in January and April–May 2002 during the Pacific Exploration of Asian Continental Emission (PEACE)‐A and B campaigns. These measurements have provided data sets that, in combination with Transport and Chemical Evolution over the Pacific (TRACE‐P) data taken in March 2001, enable studies of O 3 photochemistry from winter to late spring. A photochemical box model is used to calculate ozone formation ( F (O 3 )) and destruction ( D (O 3 )) rates constrained by the observed species concentrations. The values of F (O 3 ) and D (O 3 ) are controlled directly by NO, J (O 1 D ) (O 3 photolysis frequency), H 2 O, OH, and HO 2 . Changes in HO 2 concentration cause corresponding changes in both F (O 3 ) and D (O 3 ), leading to their coupling. Concentrations of these species, which are strongly influenced by photochemistry and transport from the Asian continent, underwent large seasonal variations. In the boundary layer (0–3 km), NO was much higher in January than in April–May, because of stronger winds, lower convective activities, and lower oxidation rates by OH in winter. The net O 3 formation rate, given by P (O 3 ) = F (O 3 ) − D (O 3 ), was largely positive in the boundary layer at 30°–45°N (1.5 − 4 ppbv d −1 ) in January, mainly because of high NO and low H 2 O values. Net O 3 formation continued from January to the end of March, demonstrating that the western Pacific is an important O 3 source region during this season. Net O 3 formation nearly ceased by late April/May because of the decrease in NO and the increase in H 2 O. In the latitude range of 20°–30°N, P (O 3 ) in the boundary layer was positive in January and turned negative by March. The earlier transition was mainly due to lower NO and higher H 2 O concentrations, combined with weaker transport and higher temperatures than those at 30°–45°N. The upper troposphere (6–12 km) has been shown to be a region of net O 3 formation throughout most of the year because of high NO and low H 2 O. The present study illustrates that a decrease in the net O 3 formation rate at 20°–45°N latitude from winter to late spring is explained systematically by the increases in J (O 1 D ), H 2 O, OH, and HO 2 (primarily due to increases in temperature and solar radiation) and the decrease in NO (primarily due to decrease in transport from the Asian continent). Differences in the seasonal variation of O 3 photochemistry observed over the North American continent are interpreted in terms of the differences in factors controlling O 3 formation and destruction." @default.
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• W2109096504 date "2004-10-14" @default.
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• W2109096504 title "Photochemistry of ozone over the western Pacific from winter to spring" @default.
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• W2109096504 doi "https://doi.org/10.1029/2004jd004871" @default.
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