State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.
Sci Total Environ. 2021 Nov 1;793:148481. doi: 10.1016/j.scitotenv.2021.148481. Epub 2021 Jun 19.
The fine particulate matter (PM) emitted by burning biomass has become the main source of pollution in cities; this pollution seriously threatens the ecosystem and inhabitants' health. A major challenge in dealing with this issue is the uncertainty regarding the influence of burning biomass on PM regional transport. In this study, Harbin-Changchun Megalopolis is the research area. Using the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model combined with satellite data and PM monitoring data, we quantitatively analyzed the regional transport of PM from burning biomass upwind of each city under different emission conditions. Conditions at burn sites, especially emission intensity and meteorological factors, as well as transport distance play significant roles in the regional transport of PM. Higher emission intensity aggravated the concentration of downwind PM, at most 19.7 μg ⋅ m. Shorter transport distance strengthened the impact of biomass burning on downstream PM by weakening elimination, which could be up to 96.8 μg ⋅ m. Moreover, meteorological factors at fire points were closely related to the transport of PM. First, lower planetary boundary layer height could enhance the transport of PM from the burning biomass by inhibiting vertical diffusion, and the enhancement could be up to 46.1 μg ⋅ m. Second, compared to strong wind, light wind caused the weaker dilution, enhancing PM regional transport by as much as 32.5 μg ⋅ m. Third, relatively humidity at 30%-40% had the strongest effect in facilitating the transport of PM from burning biomass. We conclude that comprehensively considering these three factors, namely the emission intensity, transport distance and meteorological factors at burn sites can facilitate the cross-regional development of accurate prediction models and effective pollution control measures.
生物质燃烧排放的细颗粒物（PM）已成为城市污染的主要来源，严重威胁着生态系统和居民的健康。应对这一问题的主要挑战是，燃烧生物质对 PM 区域传输的影响存在不确定性。在本研究中，以哈长城市群为研究区域。利用 HYSPLIT 模型结合卫星数据和 PM 监测数据，定量分析了不同排放条件下各城市上风方向生物质燃烧源 PM 的区域传输。燃烧源条件，特别是排放强度和气象因素以及传输距离，对 PM 的区域传输起着重要作用。较高的排放强度加剧了下风 PM 的浓度，最大可达 19.7μg ⋅ m。较短的传输距离通过减弱消除作用，强化了生物质燃烧对下游 PM 的影响，最大可达 96.8μg ⋅ m。此外，燃烧点的气象因素与 PM 的传输密切相关。首先，较低的行星边界层高度通过抑制垂直扩散，可以增强生物质燃烧产生的 PM 的传输，最大增强可达 46.1μg ⋅ m。其次，与大风相比，小风导致较弱的稀释作用，最大增强 PM 区域传输可达 32.5μg ⋅ m。第三，相对湿度在 30%-40%时对促进生物质燃烧产生的 PM 传输的作用最强。综上，综合考虑排放强度、传输距离和燃烧源气象因素这三个因素，可以促进准确预测模型和有效污染控制措施的跨区域发展。
