Seasonal and diurnal variations of ozone at a high-altitude mountain baseline station in East Asia

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Title:	Seasonal and diurnal variations of ozone at a high-altitude mountain baseline station in East Asia
Authors:	李崇德;Ou Yang, Chang-Feng;Lin, Neng-Huei;Sheu, Guey-Rong;Lee, Chung-Te;Wang, Jia-Lin
Contributors:	環境監測技術聯合中心
Keywords:	air;Air masses;air transportation;altitude;Applied sciences;atmospheric chemistry;Atmospheric pollution;Atmospherics;biomass;Biomass burning;burning;Daytime;diurnal variation;dry deposition;Exact sciences and technology;Filtering;Filtration;Long-range transport;Mountains;Mountain–valley circulation;nitric oxide;Ozone;Pollution;seasonal variation;South East Asia;spring;Stations;subsidence;summer;titration;troposphere
Date:	2012-01-01
Issue Date:	2026-04-23 15:08:13 (UTC+8)
Publisher:	Elsevier Ltd.;Kidlington: Elsevier Ltd
Abstract:	摘要： Continuous measurements of tropospheric ozone were conducted at the Lulin Atmospheric Background Station (LABS) at an altitude of 2862 m from April 2006 to the end of 2009. Distinct seasonal variations in the ozone concentration were observed at the LABS, with a springtime maximum and a summertime minimum. Based on a backward trajectory analysis, CO data, and ozonesondes, the springtime maximum was most likely caused by the long-range transport of air masses from Southeast Asia, where biomass burning was intense in spring. In contrast, a greater Pacific influence contributed to the summertime minimum. In addition to seasonal variations, a distinct diurnal pattern was also observed at the LABS, with a daytime minimum and a nighttime maximum. The daytime ozone minimum was presumably caused by sinks of dry deposition and NO titration during the up-slope transport of surface air. The higher nighttime values, however, could be the result of air subsidence at night bringing ozone aloft to the LABS. After filtering out the daytime data to remove possible local surface contributions, the average background ozone value for the period of 2006–2009 was approximately 36.6 ppb, increased from 32.3 ppb prior to data filtering, without any changes in the seasonal pattern. By applying HYSPLIT4 model analysis, the origins of the air masses contributing to the background ozone observed at the LABS were investigated. ► Tropospheric ozone was measured at a high elevation site in East Asia. ► Mechanisms causing seasonal and diurnal variations of ozone were proposed. ► Springtime ozone maximum was mainly contributed by biomass burning over SE Asia. ► M–V circulation was proposed as the major driving force for the diurnal pattern. ► Origins of air masses shaping the seasonal background values were analyzed. 出版者： Kidlington: Elsevier Ltd 出版日期： 2012 出處： Atmospheric environment (1994), 2012, Vol.46, p.279-288 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2011 Elsevier Ltd 版權： 2015 INIST-CNRS 識別號： ISSN: 1352-2310 識別號： EISSN: 1873-2844 識別號： DOI: 10.1016/j.atmosenv.2011.09.060
Appears in Collections:	[Center for Environmental Monitoring and Technology] journal & Dissertation

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