Unmanned Aerial Vehicle Measurements of Volatile Organic Compounds over a Subtropical Forest in China and Implications for Emission Heterogeneity,ACS Earth and Space Chemistry

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Unmanned Aerial Vehicle Measurements of Volatile Organic Compounds over a Subtropical Forest in China and Implications for Emission Heterogeneity
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-02-08 , DOI: 10.1021/acsearthspacechem.0c00271
Yaowei Li ₁ , Ben Liu ₂ , Jianhuai Ye ₃ , Tianjiao Jia ₁ , Reza Bashiri Khuzestani ₁ , Jia Yin Sun _{4,

5} , Xi Cheng ₁ , Yan Zheng ₁ , Xin Li ₁ , Cheng Wu _{4,

5} , Jinyuan Xin ₆ , Zhihong Wu ₇ , Matheus Akira Tomoto ₃ , Karena A. McKinney ₈ , Scot T. Martin _{3,

9} , Yong Jie Li ₂ , Qi Chen ₁

Affiliation

State Key Joint Laboratory of Environmental Simulation and Pollution Control, BIC-ESAT and IJRC, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau 999078, China
School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou 510632, China
Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Guangzhou 510632, China
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Guangdong Chebaling National Nature Reserve, Shaoguan, Guangdong 512000, China
Department of Chemistry, Colby College, Waterville, Maine 04901, United States
Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, United States

Volatile organic compounds (VOCs) are important pollutants that affect air quality and atmosphere–ecosystem interactions. Atmospheric sampling onboard a multicopter unmanned aerial vehicle (UAV), serving as an economical and flexible measurement technique, collects valuable VOC data sets at intermediate spatial scales of hundreds of meters. In this study, we deployed a UAV-based VOC sampler in South China and conducted VOC samplings at two locations over the canopy of a subtropical forest. The collected VOC samples were analyzed offline by gas chromatography-mass spectrometry. Isoprene and α-pinene, two dominant biogenic VOCs, showed day-to-night variations that were consistent with their emission patterns. High concentrations of ozone and aromatic VOCs indicate a strong influence of anthropogenic pollution in this forest area. Meanwhile, high ratios of the concentrations of methacrolein and methyl vinyl ketone to isoprene were observed, which are consistent with the possibly fast atmospheric oxidation under the anthropogenic influence. Significant daytime concentration differences were observed between the two sampling locations for isoprene. The analysis by a gradient transport model suggests a large isoprene emission heterogeneity along the mountain slope at the scale of hundreds of meters for subtropical forests, which has not yet been well represented in most biosphere emission models. Strong eddy diffusion caused by the valley breeze may also contribute to the observed concentration differences.

更新日期：2021-02-18

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