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Contributions of regional and intercontinental transport to surface ozone in the Tokyo area

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Contributions of regional and intercontinental transport to surface ozone in the Tokyo area. / Yoshitomi, M.; Wild, O.; Akimoto, H.
In: Atmospheric Chemistry and Physics , Vol. 11, No. 15, 01.08.2011, p. 7583-7599.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Yoshitomi, M, Wild, O & Akimoto, H 2011, 'Contributions of regional and intercontinental transport to surface ozone in the Tokyo area', Atmospheric Chemistry and Physics , vol. 11, no. 15, pp. 7583-7599. https://doi.org/10.5194/acp-11-7583-2011

APA

Yoshitomi, M., Wild, O., & Akimoto, H. (2011). Contributions of regional and intercontinental transport to surface ozone in the Tokyo area. Atmospheric Chemistry and Physics , 11(15), 7583-7599. https://doi.org/10.5194/acp-11-7583-2011

Vancouver

Yoshitomi M, Wild O, Akimoto H. Contributions of regional and intercontinental transport to surface ozone in the Tokyo area. Atmospheric Chemistry and Physics . 2011 Aug 1;11(15):7583-7599. doi: 10.5194/acp-11-7583-2011

Author

Yoshitomi, M. ; Wild, O. ; Akimoto, H. / Contributions of regional and intercontinental transport to surface ozone in the Tokyo area. In: Atmospheric Chemistry and Physics . 2011 ; Vol. 11, No. 15. pp. 7583-7599.

Bibtex

@article{d9367da0d2e94c4890fdc5417deea359,
title = "Contributions of regional and intercontinental transport to surface ozone in the Tokyo area",
abstract = "Japan lies downwind of the Asian continent and for much of the year air quality is directly influenced by emissions of ozone precursors over these heavily-populated and rapidly-industrializing regions. This study examines the extent to which oxidant transport from regional and distant anthropogenic sources influences air quality in Japan in springtime, when these contributions are largest. We find that European and North American contributions to surface ozone over Japan in spring are persistent, averaging 3.5 +/- 1.1 ppb and 2.8 +/- 0.5 ppb respectively, and are greatest in cold continental outflow conditions following the passage of cold fronts. Contributions from China are larger, 4.0 +/- 2.8 ppb, and more variable, as expected for a closer source region, and are generally highest near cold fronts preceding the influence of more distant sources. The stratosphere provides a varying but ever-present background of ozone of about 11.2 +/- 2.5 ppb during spring. Local sources over Japan and Korea have a relatively small impact on mean ozone, 2.4 +/- 7.6 ppb, but this masks a strong diurnal signal, and local sources clearly dominate during episodes of high daytime ozone. By examining the meteorological mechanisms that favour transport from different source regions, we demonstrate that while maximum foreign influence generally does not occur at the same time as the greatest buildup of oxidants from local sources, it retains a significant influence under these conditions. It is thus clear that while meteorological boundaries provide some protection from foreign influence during oxidant outbreaks in Tokyo, these distant sources still make a substantial contribution to exceedance of the Japanese ozone air quality standard in springtime.",
keywords = "LONG-RANGE TRANSPORT, PACIFIC AIR-POLLUTION, NORTH-ATLANTIC OCEAN, TROPOSPHERIC OZONE, EAST-ASIA, UNITED-STATES, CARBON-MONOXIDE, ANTHROPOGENIC EMISSIONS, SEASONAL-VARIATIONS, WESTERN PACIFIC",
author = "M. Yoshitomi and O. Wild and H. Akimoto",
year = "2011",
month = aug,
day = "1",
doi = "10.5194/acp-11-7583-2011",
language = "English",
volume = "11",
pages = "7583--7599",
journal = "Atmospheric Chemistry and Physics ",
issn = "1680-7316",
publisher = "Copernicus GmbH (Copernicus Publications) on behalf of the European Geosciences Union (EGU)",
number = "15",

}

RIS

TY - JOUR

T1 - Contributions of regional and intercontinental transport to surface ozone in the Tokyo area

AU - Yoshitomi, M.

AU - Wild, O.

AU - Akimoto, H.

PY - 2011/8/1

Y1 - 2011/8/1

N2 - Japan lies downwind of the Asian continent and for much of the year air quality is directly influenced by emissions of ozone precursors over these heavily-populated and rapidly-industrializing regions. This study examines the extent to which oxidant transport from regional and distant anthropogenic sources influences air quality in Japan in springtime, when these contributions are largest. We find that European and North American contributions to surface ozone over Japan in spring are persistent, averaging 3.5 +/- 1.1 ppb and 2.8 +/- 0.5 ppb respectively, and are greatest in cold continental outflow conditions following the passage of cold fronts. Contributions from China are larger, 4.0 +/- 2.8 ppb, and more variable, as expected for a closer source region, and are generally highest near cold fronts preceding the influence of more distant sources. The stratosphere provides a varying but ever-present background of ozone of about 11.2 +/- 2.5 ppb during spring. Local sources over Japan and Korea have a relatively small impact on mean ozone, 2.4 +/- 7.6 ppb, but this masks a strong diurnal signal, and local sources clearly dominate during episodes of high daytime ozone. By examining the meteorological mechanisms that favour transport from different source regions, we demonstrate that while maximum foreign influence generally does not occur at the same time as the greatest buildup of oxidants from local sources, it retains a significant influence under these conditions. It is thus clear that while meteorological boundaries provide some protection from foreign influence during oxidant outbreaks in Tokyo, these distant sources still make a substantial contribution to exceedance of the Japanese ozone air quality standard in springtime.

AB - Japan lies downwind of the Asian continent and for much of the year air quality is directly influenced by emissions of ozone precursors over these heavily-populated and rapidly-industrializing regions. This study examines the extent to which oxidant transport from regional and distant anthropogenic sources influences air quality in Japan in springtime, when these contributions are largest. We find that European and North American contributions to surface ozone over Japan in spring are persistent, averaging 3.5 +/- 1.1 ppb and 2.8 +/- 0.5 ppb respectively, and are greatest in cold continental outflow conditions following the passage of cold fronts. Contributions from China are larger, 4.0 +/- 2.8 ppb, and more variable, as expected for a closer source region, and are generally highest near cold fronts preceding the influence of more distant sources. The stratosphere provides a varying but ever-present background of ozone of about 11.2 +/- 2.5 ppb during spring. Local sources over Japan and Korea have a relatively small impact on mean ozone, 2.4 +/- 7.6 ppb, but this masks a strong diurnal signal, and local sources clearly dominate during episodes of high daytime ozone. By examining the meteorological mechanisms that favour transport from different source regions, we demonstrate that while maximum foreign influence generally does not occur at the same time as the greatest buildup of oxidants from local sources, it retains a significant influence under these conditions. It is thus clear that while meteorological boundaries provide some protection from foreign influence during oxidant outbreaks in Tokyo, these distant sources still make a substantial contribution to exceedance of the Japanese ozone air quality standard in springtime.

KW - LONG-RANGE TRANSPORT

KW - PACIFIC AIR-POLLUTION

KW - NORTH-ATLANTIC OCEAN

KW - TROPOSPHERIC OZONE

KW - EAST-ASIA

KW - UNITED-STATES

KW - CARBON-MONOXIDE

KW - ANTHROPOGENIC EMISSIONS

KW - SEASONAL-VARIATIONS

KW - WESTERN PACIFIC

U2 - 10.5194/acp-11-7583-2011

DO - 10.5194/acp-11-7583-2011

M3 - Journal article

VL - 11

SP - 7583

EP - 7599

JO - Atmospheric Chemistry and Physics

JF - Atmospheric Chemistry and Physics

SN - 1680-7316

IS - 15

ER -