Characteristics of atmospheric carbon monoxide at a high-mountain background station in East Asia

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Title:	Characteristics of atmospheric carbon monoxide at a high-mountain background station in East Asia
Authors:	李崇德;Ou-Yang, Chang-Feng;Lin, Neng-Huei;Lin, Chia-Ching;Wang, Sheng-Hsiang;Sheu, Guey-Rong;Lee, Chung-Te;Schnell, Russell C.;Lang, Patricia M.;Kawasato, Taro;Wang, Jia-Lin
Contributors:	環境監測技術聯合中心
Keywords:	air;altitude;Applied sciences;atmospheric chemistry;Atmospheric pollution;Background values;biomass;Biomass burning;burning;carbon monoxide;cluster analysis;data collection;Exact sciences and technology;Lulin atmospheric background station (LABS);Pollutants physicochemistry study: properties, effects, reactions, transport and distribution;Pollution;seasonal variation;South East Asia;spectrometers;spring;summer;wind direction
Date:	2014-01-01
Issue Date:	2026-04-23 15:04:22 (UTC+8)
Publisher:	Elsevier Ltd.;Kidlington: Elsevier Ltd
Abstract:	摘要： Atmospheric CO were monitored at the Lulin Atmospheric Background Station (LABS) with an elevation of 2862 m AMSL from April 2006 to April 2011 by the in-situ non-dispersive infrared (NDIR) spectrometer and weekly flask sample collections via collaboration with NOAA/ESRL/GMD. In general very coherent results were observed between the two datasets, despite a slight difference between the two. A distinct seasonal pattern of CO was noticed at the LABS with a springtime maximum and a summertime minimum, which was predominately shaped by the long-range transport of biomass burning air masses from Southeast Asia and oceanic influences from the Pacific, respectively. Diurnal cycles were also observed at the LABS, with a maximum in late afternoon and a minimum in early morning. The daytime CO maximum was most likely caused by the up-slope transport of lower elevation air. After filtering out the possibly polluted data points from the entire dataset with a mathematic procedure, the mean background CO level at the LABS was assessed as 129.3 ± 46.6 ppb, compared to 149.0 ± 72.2 ppb prior to the filtering. The cluster analysis of the backward trajectories revealed six possible source regions, which shows that air masses originating from the Westerly Wind Zone were dominated in spring and winter resulting in higher CO concentrations. As a contrast, the oceanic influences from the Pacific were found mostly in summer, contributing a lower seasonal CO concentration throughout a year. •5-year real-time measurements of surface CO at a mountain-top station in East Asia.•Generally coherent results were found between in-situ CO data and NOAA flask data.•Distinct seasonal and diurnal cycles were observed and discussed in depth. 出版者： Kidlington: Elsevier Ltd 出版日期： 2014-06-01 出處： Atmospheric Environment, 2014-06, Vol.89, p.613-622 資源來源： Elsevier ScienceDirect Journals Complete - Autoholdings 版權： 2014 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.2014.02.060
Appears in Collections:	[Center for Environmental Monitoring and Technology] journal & Dissertation

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