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| Online measurement of isoprene at a national air background monitoring station in the Nanling Mountains,South China |
| ZHANG Shi-yang1, GONG Dao-cheng1, WANG Hao1, SONG Wei1, ZHANG Shen-yang1, WANG An-hou1, CHEN Duo-hong3, ZHOU Lei1, WANG Bo-guang1,2 |
1. Institute of Environment and Climate, Jinan University, Guangzhou 511443, China;
2. Research Center on Low-carbon Economy for Guangzhou Region, Jinan University, Guangzhou 510632, China;
3. Guangdong Environmental Monitoring Center, Guangzhou 510308, China |
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Abstract Isoprene emissions from forest are important precursors of tropospheric ozone and secondary organic aerosols.To study the background concentration and variation characteristics of isoprene at a subtropical forest (Shaoguan,Nanling) in southern China,4-month online measurements of isoprene emissions and meteorological parameters were conducted in July-November 2015.The results show that the overall daily average concentration of isoprene at the forest was (0.173±0.171)×10-9,with (0.261±0.178)×10-9 in the wet season and (0.080±0.089)×10-9ppbv in the dry season.Isoprene concentration is much higher during daytime (6:00-18:00) than nighttime,with an average of 0.247±0.332ppbv and (0.071±0.129)×10-9,respectively.It began to rise steadily from 6:00,and gradually decreased after the peak at 14:00.Isoprene concentrations were positively exponential functional related to temperature,and in the wet season,the temperature had greater influence on isoprene emission.Isoprene concentrationsduring the O3 episode days[(0.257±0.128)×10-9]were much higher than during the non-O3 episode days[(0.158±0.173)×10-9],suggesting that the photochemical degradation was more active during the O3 episode days.In addition,it was found that typhoon (e.g.Dujuan) would lead to increase in isoprene emissions due to the transportation of air pollutants to the forest.
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Received: 14 April 2017
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