Meteorological feedback and eco-environmental impact of Asian dust: A simulation study
Meteorological feedback and eco-environmental impact of Asian dust: A simulation study
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亚洲沙尘的气象反馈与生态环境影响：模拟研究
DOI：
10.1016/j.atmosenv.2021.118350
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发表时间：
2021
影响因子：
5
通讯作者：
Yang Zhou
中科院分区：
文献类型：
--
作者：
Shishi Yang;Zilin Wang;Xin Huang;Wencai Wang;Lifang Sheng;Yang Zhou
风沙在空气质量、地球化学循环和气候变化中起着至关重要的作用。在世界主要沙尘源区之一的东亚地区，沙尘暴频繁席卷中国东部，对大气污染和生态环境产生了巨大的负面影响。综合多个观测数据和在线气象化学耦合模式WRF-Chem，从排放估算、气象反馈和可能对生态环境的影响等角度，对2017年5月上旬发生在戈壁滩的一次强沙尘暴事件进行了综合分析。我们优化了沙尘气溶胶的粒径分布，通过应用当地的观测，以更好地代表沙尘排放和区域输送模式。观测和模拟结果均表明，沙尘暴在戈壁滩源区爆发时PM10浓度超过1500 μg/m3，并迅速向下风向输送，导致我国北方和东部城市空气质量恶化。此外，我们发现，沙尘暴显着扰动的温度分层，因为矿物粉尘是一种辐射活跃的气溶胶，可以吸收短波和长波辐射。2-3公里高空沙尘层温度升高1-2 ℃，地表温度降低2 ℃左右，使行星边界层更加稳定，间接加重了中国东部局地近地面空气污染。此外，大量的沙尘沉降增加了海洋初级生产力，黄海中部叶绿素a浓度最大值由4 mg/m3上升到14 mg/m3。这项研究强调了亚洲粉尘污染对下风向地区空气质量和海洋生态系统的重要影响。
Wind-blown dust plays a crucial role in air quality, biogeochemical cycles, and climate change. In East Asia, one of the main dust source regions in the world, dust storms frequently engulf eastern China, with a substantial negative effect on air pollution and the ecological environment. By integrating multiple observations and the online coupled meteorology-chemistry model WRF-Chem, a severe dust storm event originating from the Gobi Desert in early May 2017 is comprehensively analyzed from the perspective of emission estimation, meteorological feedback, and the possible impact on the ecological environment. We optimize the size distribution of dust aerosol by applying local observations to better represent dust emission and regional transport in the model. Both the observations and simulations indicate that the dust storm broke out with PM10concentrations exceeding 1500 μg/m3in the source region of the Gobi Desert, and was quickly transported downwind, deteriorating the air quality of cities in northern and eastern China. Moreover, we find that the dust storm significantly perturbed the temperature stratification, since mineral dust is a radiatively active aerosol and can absorb both short- and long-wave radiation. The upper dust layer at an altitude of around 2–3 km became warmer by 1–2 °C while the surface temperature decreased by about 2 °C, making the planetary boundary layer more stable and indirectly aggravating local air pollution near the ground in eastern China. Furthermore, during this event, a large amount of dust deposition increased ocean primary productivity, with the maximum Chlorophyll-a concentration rising from 4 to 14 mg/m3in the central area of the Yellow Sea. This study highlights the critical impact of Asian dust pollution on air quality and marine ecosystems in downwind areas.