Evaluation of Photochemical Pollution during Transport of Air Pollutants in Spring over the East China Sea
We conducted intensive observations of ozone, CO, NOx (=NO and NO2), NOy (total odd nitrogen species including particulate nitrate) and total nitrate (the sum of gaseous HNO3 and particulate nitrate) at Cape Hedo, Okinawa, Japan, from 19 March to 3 April, 2009, to investigate ozone production during...
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| Format: | Article |
| Language: | English |
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Springer
2015-12-01
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| Series: | Asian Journal of Atmospheric Environment |
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| Online Access: | http://asianjae.org/_common/do.php?a=full&b=11&bidx=1537&aidx=19482 |
| _version_ | 1797714053204803584 |
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| author | Yasuhiro Sadanaga Tadashi Kobashi Akie Yuba Shungo Kato Yoshizumi Kajii Akinori Takami Hiroshi Bandow |
| author_facet | Yasuhiro Sadanaga Tadashi Kobashi Akie Yuba Shungo Kato Yoshizumi Kajii Akinori Takami Hiroshi Bandow |
| author_sort | Yasuhiro Sadanaga |
| collection | DOAJ |
| description | We conducted intensive observations of ozone, CO, NOx (=NO and NO2), NOy (total odd nitrogen species including particulate nitrate) and total nitrate (the sum of gaseous HNO3 and particulate nitrate) at Cape Hedo, Okinawa, Japan, from 19 March to 3 April, 2009, to investigate ozone production during long-range transport from the Asian continent. Ozone production efficiency (OPE) was used to evaluate photochemical ozone production. OPE is defined as the number of molecules of ozone produced photochemically during the lifetime of a NOx molecule. OPE is calculated by the ratio of the concentration increase of ozone to that of NOz (=NOy-NOx). Average OPE during observation was estimated to be 12.6±0.5, but concentrations of ozone increased nonlinearly with those of NOz. This non-linearity suggests that OPE depends on air mass origin and NOz concentrations. There were very different values of OPE for the same air mass origin, so that only the air mass origin alone does not control OPE. OPE was low when NOz concentration was high. We examined the correlation between NOz and CO/NOy ratios, which we used instead of the ratio of non-methane hydrocarbons (NMHCs) to NOx. The CO/NOy ratios decreased with increasing NOz concentrations. These results indicate that competition reactions of OH with NMHCs and NO2 are the rate determining steps of photochemical ozone production during long-range transport from the Asian continent to Cape Hedo, for high concentrations of nitrogen oxides. |
| first_indexed | 2024-03-12T07:46:17Z |
| format | Article |
| id | doaj.art-de31f2f908c64576a486ccba9b082815 |
| institution | Directory Open Access Journal |
| issn | 1976-6912 2287-1160 |
| language | English |
| last_indexed | 2024-03-12T07:46:17Z |
| publishDate | 2015-12-01 |
| publisher | Springer |
| record_format | Article |
| series | Asian Journal of Atmospheric Environment |
| spelling | doaj.art-de31f2f908c64576a486ccba9b0828152023-09-02T21:01:05ZengSpringerAsian Journal of Atmospheric Environment1976-69122287-11602015-12-019423724610.5572/ajae.2015.9.4.237Evaluation of Photochemical Pollution during Transport of Air Pollutants in Spring over the East China SeaYasuhiro Sadanaga0Tadashi Kobashi1Akie Yuba2Shungo Kato3Yoshizumi Kajii4Akinori Takami5Hiroshi Bandow6Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, JapanDepartment of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, JapanDepartment of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, JapanDivision of Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, JapanGraduate School of Global Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, Kyoto, Kyoto 606-8501, JapanNational Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, JapDepartment of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, JapanWe conducted intensive observations of ozone, CO, NOx (=NO and NO2), NOy (total odd nitrogen species including particulate nitrate) and total nitrate (the sum of gaseous HNO3 and particulate nitrate) at Cape Hedo, Okinawa, Japan, from 19 March to 3 April, 2009, to investigate ozone production during long-range transport from the Asian continent. Ozone production efficiency (OPE) was used to evaluate photochemical ozone production. OPE is defined as the number of molecules of ozone produced photochemically during the lifetime of a NOx molecule. OPE is calculated by the ratio of the concentration increase of ozone to that of NOz (=NOy-NOx). Average OPE during observation was estimated to be 12.6±0.5, but concentrations of ozone increased nonlinearly with those of NOz. This non-linearity suggests that OPE depends on air mass origin and NOz concentrations. There were very different values of OPE for the same air mass origin, so that only the air mass origin alone does not control OPE. OPE was low when NOz concentration was high. We examined the correlation between NOz and CO/NOy ratios, which we used instead of the ratio of non-methane hydrocarbons (NMHCs) to NOx. The CO/NOy ratios decreased with increasing NOz concentrations. These results indicate that competition reactions of OH with NMHCs and NO2 are the rate determining steps of photochemical ozone production during long-range transport from the Asian continent to Cape Hedo, for high concentrations of nitrogen oxides.http://asianjae.org/_common/do.php?a=full&b=11&bidx=1537&aidx=19482ozone production efficiencytotal odd nitrogen specieslong-range transporteast asianon-methane hydrocarbons |
| spellingShingle | Yasuhiro Sadanaga Tadashi Kobashi Akie Yuba Shungo Kato Yoshizumi Kajii Akinori Takami Hiroshi Bandow Evaluation of Photochemical Pollution during Transport of Air Pollutants in Spring over the East China Sea Asian Journal of Atmospheric Environment ozone production efficiency total odd nitrogen species long-range transport east asia non-methane hydrocarbons |
| title | Evaluation of Photochemical Pollution during Transport of Air Pollutants in Spring over the East China Sea |
| title_full | Evaluation of Photochemical Pollution during Transport of Air Pollutants in Spring over the East China Sea |
| title_fullStr | Evaluation of Photochemical Pollution during Transport of Air Pollutants in Spring over the East China Sea |
| title_full_unstemmed | Evaluation of Photochemical Pollution during Transport of Air Pollutants in Spring over the East China Sea |
| title_short | Evaluation of Photochemical Pollution during Transport of Air Pollutants in Spring over the East China Sea |
| title_sort | evaluation of photochemical pollution during transport of air pollutants in spring over the east china sea |
| topic | ozone production efficiency total odd nitrogen species long-range transport east asia non-methane hydrocarbons |
| url | http://asianjae.org/_common/do.php?a=full&b=11&bidx=1537&aidx=19482 |
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