Nighttime peroxy radicals chemistry at Rishiri Island during the campaign RISFEX 2003

• Published in: Science China. Chemistry Vol. 55; no. 11; pp. 2450 - 2461
• Main Authors: Liu, Yan, Wang, JiangTao, Wang, ZhuQing, Gong, XiaoDong, Yang, Bing, Tan, LiJu, Qi, Bin
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science China Press 01.11.2012; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Humidity; Mixing ratio; Night; Nitrates; Ozone; Peroxy radicals; Relative humidity; 单萜烯; 时空变化; 氧自由基; 浓度测定; 湿度修正; 相对湿度; 自由基化学; 过氧化; ozonolysis; monoterpene; humidity correction; peroxy radicals; nighttime chemistry
• ISSN: 1674-7291; 1869-1870
• DOI: 10.1007/s11426-012-4536-7

Peroxy radicals （ROx） concentrations were measured by Peroxy Radical Chemical Amplifier （PERCA） technique during the field campaign RISFEX 2003 （RiShifi Fall Experiment 2003）, which was performed in September 2003 at Rishiri island （45.07 N, 141.12 E, and 35 m asl） in the sea of Japan. The concentrations of nighttime ROx radicals had temporal variations around an average of 7.9±5.8 （1σ） pptv and showed a positive correlation with the summed mixing ratio of four monoterpene species. Model calculations suggested that local nighttime ROx radicals were dominated by the reactions of monoterpene with ozone （03） and nitrate radical （NO3）, contributing ca. 76% and 19%, respectively. The comparisons between the observed ROx and ones modeled had implied that the current model may be overestimated the yields of peroxy radicals from the reactions of monoterpenes with ozone and an important source of peroxy radicals was possibly missed. Abnormal high concentrations of observed ROx radicals were found during high relative humidity （RH） period （especially 〉 95%）, and the possible explanation was that the humidity correction of ROx radicals under high RH conditions may be inaccurate and overestimates ROx concen-