Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, and Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China.
Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China.
Environ Sci Technol. 2022 Jan 4;56(1):175-184. doi: 10.1021/acs.est.1c06170. Epub 2021 Dec 13.
Biogenic volatile organic compound (BVOC) emissions have long been known to play vital roles in modulating the formation of ozone and secondary organic aerosols (SOAs). While early studies have evaluated their impact globally or regionally, the BVOC emissions emitted from urban green spaces (denoted as U-BVOC emissions) have been largely ignored primarily due to the failure of low-resolution land cover in resolving such processes, but also because their important contribution to urban BVOCs was previously unrecognized. In this study, by utilizing a recently released high-resolution land cover dataset, we develop the first set of emission inventories of U-BVOCs in China at spatial resolutions as high as 1 km. This new dataset resolved densely distributed U-BVOCs in urban core areas. The U-BVOC emissions in megacities could account for a large fraction of total BVOC emissions, and the good agreement of the interannual variations between the U-BVOC emissions and ozone concentrations over certain regions stresses their potentially crucial role in influencing ozone variations. The newly constructed U-BVOC emission inventory is expected to provide an improved dataset to enable the research community to re-examine the modulation of BVOCs on the formation of ozone, SOA, and atmospheric chemistry in urban environments.
生物源挥发性有机化合物 (BVOC) 的排放长期以来被认为在调节臭氧和二次有机气溶胶 (SOA) 的形成方面起着至关重要的作用。虽然早期的研究已经评估了它们在全球或区域范围内的影响，但城市绿地 (表示为 U-BVOC 排放) 的 BVOC 排放很大程度上被忽视了，主要是因为低分辨率的土地覆盖无法解决这些过程，也因为它们对城市 BVOC 的重要贡献以前未被认识到。在这项研究中，我们利用最近发布的高分辨率土地覆盖数据集，首次以高达 1 公里的空间分辨率开发了中国 U-BVOC 排放的排放清单。这个新数据集解决了城市核心区密集分布的 U-BVOC 问题。特大城市的 U-BVOC 排放可能占总 BVOC 排放的很大一部分，某些地区 U-BVOC 排放与臭氧浓度之间的年际变化的良好一致性强调了它们在影响臭氧变化方面的潜在关键作用。新构建的 U-BVOC 排放清单有望提供一个改进的数据集，使研究界能够重新审视 BVOC 对臭氧、SOA 和城市环境大气化学形成的调节作用。
