TY - JOUR
T1 - Vertical profiles of biogenic volatile organic compounds as observed online at a tower in Beijing
AU - Zhang, Huina
AU - Zhang, Yanli
AU - Huang, Zhonghui
AU - Acton, W. joe F.
AU - Wang, Zhaoyi
AU - Nemitz, Eiko
AU - Langford, Ben
AU - Mullinger, Neil
AU - Davison, Brian
AU - Shi, Zongbo
AU - Liu, Di
AU - Song, Wei
AU - Yang, Weiqiang
AU - Zeng, Jianqiang
AU - Wu, Zhenfeng
AU - Fu, Pingqing
AU - Zhang, Qiang
AU - Wang, Xinming
PY - 2020/5/1
Y1 - 2020/5/1
N2 - Vertical profiles of isoprene and monoterpenes were measured by a proton transfer reaction-time of flight-mass spectrometry (PTR-ToF-MS) at heights of 3, 15, 32, 64, and 102 m above the ground on the Institute of Atmospheric Physics (IAP) tower in central Beijing during the winter of 2016 and the summer of 2017. Isoprene mixing ratios were larger in summer due to much stronger local emissions whereas monoterpenes were lower in summer due largely to their consumption by much higher levels of ozone. Isoprene mixing ratios were the highest at the 32 m in summer (1.64 ± 0.66 ppbV) and at 15 m in winter (1.41 ± 0.64 ppbV) with decreasing concentrations to the ground and to the 102 m, indicating emission from the tree canopy of the surrounding parks. Monoterpene mixing ratios were the highest at the 3 m height in both the winter (0.71 ± 0.42 ppbV) and summer (0.16 ± 0.10 ppbV) with a gradual decreasing trend to 102 m, indicting an emission from near the ground level. The lowest isoprene and monoterpene mixing ratios all occurred at 102 m, which were 0.71 ± 0.42 ppbV (winter) and 1.35 ± 0.51 ppbV (summer) for isoprene, and 0.42 ± 0.22 ppbV (winter) and 0.07 ± 0.06 ppbV (summer) for monoterpenes. Isoprene in the summer and monoterpenes in the winter, as observed at the five heights, showed significant mutual correlations. In the winter monoterpenes were positively correlated with combustion tracers CO and acetonitrile at 3 m, suggesting possible anthropogenic sources.
AB - Vertical profiles of isoprene and monoterpenes were measured by a proton transfer reaction-time of flight-mass spectrometry (PTR-ToF-MS) at heights of 3, 15, 32, 64, and 102 m above the ground on the Institute of Atmospheric Physics (IAP) tower in central Beijing during the winter of 2016 and the summer of 2017. Isoprene mixing ratios were larger in summer due to much stronger local emissions whereas monoterpenes were lower in summer due largely to their consumption by much higher levels of ozone. Isoprene mixing ratios were the highest at the 32 m in summer (1.64 ± 0.66 ppbV) and at 15 m in winter (1.41 ± 0.64 ppbV) with decreasing concentrations to the ground and to the 102 m, indicating emission from the tree canopy of the surrounding parks. Monoterpene mixing ratios were the highest at the 3 m height in both the winter (0.71 ± 0.42 ppbV) and summer (0.16 ± 0.10 ppbV) with a gradual decreasing trend to 102 m, indicting an emission from near the ground level. The lowest isoprene and monoterpene mixing ratios all occurred at 102 m, which were 0.71 ± 0.42 ppbV (winter) and 1.35 ± 0.51 ppbV (summer) for isoprene, and 0.42 ± 0.22 ppbV (winter) and 0.07 ± 0.06 ppbV (summer) for monoterpenes. Isoprene in the summer and monoterpenes in the winter, as observed at the five heights, showed significant mutual correlations. In the winter monoterpenes were positively correlated with combustion tracers CO and acetonitrile at 3 m, suggesting possible anthropogenic sources.
KW - Biogenic volatile organic compounds (BVOCs)
KW - Isoprene
KW - Monoterpenes
KW - Proton transfer reaction-time of flight-mass spectrometry (PTR-ToF-MS)
KW - Vertical profiles
UR - http://www.scopus.com/inward/record.url?scp=85084588787&partnerID=8YFLogxK
U2 - 10.1016/j.jes.2020.03.032
DO - 10.1016/j.jes.2020.03.032
M3 - Article
SN - 1001-0742
VL - 95
SP - 33
EP - 42
JO - Journal of Environmental Sciences
JF - Journal of Environmental Sciences
ER -