کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4445458 | 1311288 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Long-term comparison of filter method and sensitive analyser in monitoring of sulphur dioxide
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Co-located long-term routine measurements of sulphur dioxide with the impregnated filter method and a pulsed fluorescence analyser at four Finnish background stations were compared. The data consist of 9 years of parallel measurements at the Virolahti station and 8, 7 and 2 years in Utö, Oulanka and Ãhtäri, respectively, between the years 1993-2001. During the whole study period, the daily SO2 concentrations measured with the analyser and the filter method showed excellent agreement in Virolahti (number of daily data pairs 2748, r2=0.99) and Utö (n=2328, r2=0.97), and no systematic relative error between the two methods was found. Also in Oulanka (n=2131, r2=0.99) and Ãhtäri (n=643, r2=0.97) the linear model described the data well. However, in Oulanka the analyser produced 16% and in Ãhtäri 10% higher results than the filter method. The difference would decrease to 12% in Oulanka and to 8% in Ãhtäri if the concentrations were given at the same reference pressure. At all stations also a small constant error (analyser>filter) of the order of 0.03-0.06 μg S mâ3 was discerned. The role of nitrogen oxide, volatile organic compounds and water vapour interferences as well as extreme temperatures were studied but no clear systematic influence by them on the daily differences between the two methods was detected.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 39, Issue 14, May 2005, Pages 2683-2693
Journal: Atmospheric Environment - Volume 39, Issue 14, May 2005, Pages 2683-2693
نویسندگان
Sirkka Leppänen, Pia Anttila, Heikki Lättilä, Ulla Makkonen,