کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4450239 | 1620550 | 2012 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Characteristics of atmospheric carbonyls during haze days in Beijing, China Characteristics of atmospheric carbonyls during haze days in Beijing, China](/preview/png/4450239.png)
Characteristics of atmospheric carbonyls during haze days in Beijing were studied in August 2006. Formaldehyde (35.65 ± 14.74 μg/m3), acetaldehyde (15.65 ± 12.37 μg/m3) and acetone (8.83 ± 5.23 μg/m3) are three most abundant carbonyls, accounting for ~ 75% of total carbonyls. Their levels and O3 clearly peaked in the afternoon (especially for formaldehyde), implying photochemical formation. The observed C1/C2 (2.69 ± 0.78) and C2/C3 (6.29 ± 2.87) ratios indicated the important influence of anthropogenic source on carbonyls, and the higher C1/C2 (2.69) ratio in haze days also implied photochemical formation of carbonyls. Correlation coefficient (R2) among formaldehyde, acetaldehyde, acetone and total carbonyls were 0.66–0.95 together with C1/C2 ratio analysis and diurnal variations of carbonyls and O3, indicating ambient carbonyls in haze days of Beijing are mainly dominated by photochemical formation.
► First study of carbonyls during haze days in Beijing.
► Formaldehyde, acetaldehyde and acetone are three most abundant carbonyls.
► Results in haze days implied photochemical formation of carbonyls.
Journal: Atmospheric Research - Volumes 114–115, 1 October 2012, Pages 17–27