Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/5599
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dc.contributorDepartment of Civil and Environmental Engineering-
dc.creatorChan, CY-
dc.creatorZheng, XD-
dc.creatorChan, LY-
dc.creatorCui, H-
dc.creatorGinn, EWL-
dc.creatorLeung, YK-
dc.creatorLam, HM-
dc.creatorZheng, YG-
dc.creatorQin, Y-
dc.creatorZhao, CS-
dc.creatorWang, T-
dc.creatorBlake, DR-
dc.creatorLi, YS-
dc.date.accessioned2014-12-11T08:24:58Z-
dc.date.available2014-12-11T08:24:58Z-
dc.identifier.issn2169-897X-
dc.identifier.urihttp://hdl.handle.net/10397/5599-
dc.language.isoenen_US
dc.publisherWiley-Blackwellen_US
dc.rightsCopyright 2004 by the American Geophysical Unionen_US
dc.subjectTropospheric zoneen_US
dc.subjectChinaen_US
dc.subjectOzone transporten_US
dc.titleVertical profile and origin of wintertime tropospheric ozone over China during the PEACE‐A perioden_US
dc.typeJournal/Magazine Articleen_US
dc.description.otherinformationAuthor name used in this publication: T. Wangen_US
dc.description.otherinformationAuthor name used in this publication: Y. S. Lien_US
dc.identifier.spage1-
dc.identifier.epage14-
dc.identifier.volume109-
dc.identifier.doi10.1029/2004JD004581-
dcterms.abstractDuring the Pacific Exploration of Asian Continental Emission (PEACE) phase A mission in January 2002, we launched ozonesondes in subtropical southeast China at Hong Kong (114.17°E, 22.31°N), middle latitude northeast China at Beijing (116.47°E, 39.81°N), and northwest China at Xining (101.45°E, 36.43°N) in order to study long-range ozone (O3) transport from Eurasia, tropospheric O₃ sources in China, and O₃ outflow to the Pacific. Tropospheric O₃ showed a complex vertical distribution with average tropospheric O₃ columns of 39 ± 4, 23 ± 3, and 30 ± 6 DU in Hong Kong, Beijing, and Xining, respectively, which accounted for 17 ± 2%, 7 ± 1%, and 10 ± 1% of the total O₃ column. The lower tropospheric and boundary layer (BL) O₃ over Xining and especially Beijing exhibited low values, suggesting negligible O₃ formation in middle latitudes of China during the winter season. The results also revealed frequent propagation of enhanced O₃ layers from the lower stratosphere to the upper troposphere over Xining and especially Beijing, suggesting that stratospheric O₃ is an important source of O₃ in the upper troposphere of northern China. This “natural” O₃ is transported downwind by the prevailing westerly wind and acts as a source of O₃ to the east Asian coast and northwestern Pacific. We observed elevated O₃, with a maximum mixing ratio up to 111 ppbv, at 1.5 km in the upper BL over Hong Kong. The elevated O₃ was resulted from transport of pollutants from northwest-central or southwest China and regional O₃ formation and accumulation in south China including the Pearl River Delta and Hong Kong. We also observed enhanced O₃ (>95 ppbv) in the middle and upper troposphere over Hong Kong in air masses transported along the subtropical jet from tropical and subtropical East Africa, south Asia, and Southeast Asia. The O₃ enhancements were most likely due to intrusion of stratospheric O₃ into the troposphere in the Indo-Burmese region of tropical Southeast Asia, where substantial downward motion had been observed.-
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationJournal of geophysical research. Atmospheres, Dec. 2004, v. 109, D23S6, p. 1-14-
dcterms.isPartOfJournal of geophysical research. Atmospheres-
dcterms.issued2004-12-
dc.identifier.isiWOS:000224430100001-
dc.identifier.scopus2-s2.0-20044380539-
dc.identifier.eissn2169-8996-
dc.identifier.rosgroupidr23863-
dc.description.ros2004-2005 > Academic research: refereed > Publication in refereed journal-
dc.description.oaVersion of Recorden_US
dc.identifier.FolderNumberOA_IR/PIRAen_US
dc.description.pubStatusPublisheden_US
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