| dc.description.abstract | The purpose of this study is to determine the background values of CO, O3 and PM10 collected at Lulin Atmosphere Background Station (LABS) during the period of April 2006 to March 2008, using AGAGE statistical method. The impact of source regions on LABS is also studied.
As a result, the background values of CO, O3 and PM10 concentrations are 79 ppb, 27 ppb and 5 ?g m-3, respectively. During this two-year period, the events of background condition, PM10, biomass burning and (CO+PM10) accounted for 61%, 17%, 12% and 7% of the time, respectively. In spring, westerly flow across southern China and Indo-China peninsula can bring up the biomass burning pollutants to LABS, resulting in higher average CO, O3 and PM10 concentrations to 212 ppb, 63 ppb and 27 ?g m-3, respectively. PM10 events were primarily due to stable atmosphere with low wind speed, inducing lower dispersion of aerosol particles. CO and CO+ PM10 events were attributed to the long-range transport of pollutants originated from China. Maritime average CO, O3 and PM10 concentrations were 69 ppb, 23 ppb, 6.3 ?g m-3, respectively, while, for continental origin, they were 119 ppb, 35 ppb and 13.5 ?g m-3, respectively.
Compared with other atmosphere background stations, LABS and those stations located in the Pacific Ocean received cleaner air in summer. For some stations in lower troposphere, maximum levels of pollutants appeared in winter. In contrast, the stations in higher troposphere such as LABS and Mauna Loa Observatory had the maximum levels of pollutants in spring. | en_US |