Fig. 1: The correlations between OH radicals and environmental parameters.
From: Reactive aldehyde chemistry explains the missing source of hydroxyl radicals
a NO dependence on ratios of observed to modeled OH (OHobs/OHmod) during daytime (around 08:00-17:00 local time) covering both high NO and low NO conditions in the warm-season campaigns in China. These field campaigns include: Backgarden, Guangdong in summer 20062,11; Yufa, Beijing in summer 200614; Wangdu, Hebei in summer 201415,73; Heshan, Guangdong in autumn 201416; Taizhou, Jiangsu in summer 201823; Shenzhen, Guangdong in autumn 201822; Chengdu, Sichuan in summer 201917. The circles denote the median values, and the error bars denote the 25th to 75th percentiles. b Correlations of missing OH sources with the matrix of OH reactivity, including ratios of anthropogenic volatile organic compound (AVOC) reactivity versus NO reactivity (kAVOCs/kNO), ratios of biogenic volatile organic compound (BVOC) reactivity versus NO reactivity (kBVOCs/kNO), and ratios of oxygenated volatile organic compound (OVOC) reactivity versus NO reactivity (kOVOCs/kNO) at low NO conditions (10:00-15:00 local time) in the seven warm-season campaigns in China. The circles denote the median values, and the error bars denote the 25th to 75th percentiles. The dotted line indicates the linear fitting curve. The shading shows the 95% confidence intervals.
