从地面和卫星观测结果看当地污染和运输尘埃对一个半干旱区站点上空近地表气溶胶特性的影响

IF 2.9 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Bhavyasree Akkiraju, Chakradhar Rao Tandule, Balakrishnaiah Gugamsetty, Raja Obul Reddy Kalluri, Lokeswara Reddy Thotli, Rama Gopal Kotalo, Siva Sankara Reddy Lingala
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引用次数: 0

摘要

源自干旱地区的矿物尘埃对空气质量、健康和气候有很大影响,是影响最大的气溶胶之一。它的远距离传播能力会严重影响当地的空气质量。在我们针对 2021 年进行的研究中,我们利用前所未有的同步原位测量来评估一个半干旱地区站点的近地表气溶胶总量、质量浓度和大小分布。此外,我们还利用地表气溶胶特性的现场测量数据和气象记录,对沙尘事件进行了深入研究。冬季记录到的总数量浓度最高(230.1 ± 60.61 cm-3),这归因于低温、高相对湿度、稳定的风况和有限的扩散等综合因素。我们的研究结果显示了一种值得注意的相关性:等效黑碳质量分数每增加 1%,昼夜温度范围就会上升 1.73 °C,周末效应的影响非常明显。在 4 月 7 日至 10 日和 6 月 16 日至 30 日的沙尘暴期间,我们观察到各种表面参数,如粒度分布(NSD)、总质量浓度和粗粒质量浓度、有效半径和散射系数都显著增加(两倍)。尤其引人注目的是,在这些沙尘事件中,NSD 的增加幅度一直超过 1.0 微米以上气溶胶的两倍,而 5.0 微米以上气溶胶的增加幅度则高达十倍。除了我们的地表观测数据外,卫星垂直剖面图显示,在沙尘暴期间,位于 2 至 4 千米高度的沙尘高架层非常突出。这些观测结果与现场地表数据和再分析数据获得的尘柱质量通量非常吻合。再分析和模型数据进一步支持了我们的研究结果,表明在沙尘暴期间,气溶胶从中东和南亚进行了长程飘移。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The effect of local pollution and transport dust on near surface aerosol properties over a semi-arid station from ground and satellite observations

The effect of local pollution and transport dust on near surface aerosol properties over a semi-arid station from ground and satellite observations

Mineral dust, originating in arid regions, exerts substantial influence on air quality, health, and climate, ranking it among the most impactful aerosols. Its capacity to travel over great distances can significantly impact local air quality. In our study conducted for the year 2021, we made use of unprecedented, simultaneous in situ measurements to assess the total number, mass concentrations, and size distribution of near-surface aerosols at a semi-arid station. Furthermore, we conducted an in-depth examination of dust episodes, drawing upon evidence from in situ measurements of surface aerosol properties and meteorological records. The highest total number concentrations (230.1 ± 60.61 cm−3) were recorded during the winter season, attributed to a combination of factors including low temperatures, high relative humidity, stable wind conditions, and limited dispersion. Our findings reveal a noteworthy correlation: for every 1% increase in the equivalent black carbon mass fraction, the diurnal temperature range rises by 1.73 °C, with a noticeable impact of the weekend effect. During the dust episodes occurring on April 7–10 and June 16–30, we observed a significant increase (> twofold) in various surface parameters, such as number size distribution (NSD), total and coarse mode mass concentrations, effective radius, and scattering coefficient. Particularly striking was the enhancement in NSD during these dust episodes, consistently exceeding twofold for aerosols larger than 1.0 µm and reaching as high as tenfold for aerosols larger than 5.0 µm. In addition to our surface observations, satellite vertical profiles showed a prominent dust elevated layer situated between 2 and 4 km altitude during the dust episodes. These observations were well-aligned with in situ surface data and dust columnar mass flux obtained from re-analysis data. Re-analysis and model data further support our findings, indicating a long-range transport of aerosols from the Middle East and South Asia during the dust episodes.

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来源期刊
Air Quality Atmosphere and Health
Air Quality Atmosphere and Health ENVIRONMENTAL SCIENCES-
CiteScore
8.80
自引率
2.00%
发文量
146
审稿时长
>12 weeks
期刊介绍: Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health. It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes. International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals. Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements. This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.
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