Transport and deposition of microplastics and microrubbers during a dust storm (Sarakhs, northeast Iran)

IF 3.1 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Aeolian Research Pub Date : 2024-09-30 DOI:10.1016/j.aeolia.2024.100942
Sajjad Abbasi , Neda Hashemi , Nafiseh Khodabakhshloo , Monireh Mina , Mohammad Reza Yousefi , Andrew Turner
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Abstract

Dust storms are important vehicles for the erosion and translocation of geogenic material in arid and semi-arid climates but little is known about their role in transporting microplastics (MPs). In this study, local soils (n = 20) and dusts deposited from a storm (n = 41) have been sampled from a remote region of northeastern Iran (Sarakhs) and the quantities and characteristics of MPs and microrubbers (MRs) determined using established techniques. In dusts, MPs and MRs were detected in 33 and 17 cases, respectively, with respective median and maximum concentrations of 0.48 and 23.0 MP g−1 and 0.50 and 6.48 MR g−1 and depositional fluxes of up to about 12 MP m−2 h−1 and 7 MR m−2 h−1. In soils, MPs and MRs were detected in ten and eight cases, respectively, with respective median and maximum concentrations of 0.25 and 1.90 MP g−1 and 3.27 and 14.3 MR g−1. Overall, the ratio of MPs in dusts to soils relative to MRs in dusts to soils was about 20, reflecting the greater mobility of the former type of particle. This can be attributed to the ready suspension and more favourable aerodynamic properties of fibrous MPs compared with fragmented MRs. A comparison of MPs in dusts and soils suggests a preferential long-range transport of fibres with certain characteristics (e.g., long, red and constructed of polypropylene), with HYSPLIT back trajectory modelling suggesting secondary (e.g., soil) sources to the south and southwest. Dust storms are important regional transporters of atmospheric MPs and MRs whose role is predicted to increase as desertification and the demands for potable water and plastics rise.
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沙尘暴期间微塑料和微橡胶的迁移和沉积(伊朗东北部萨拉赫斯)
沙尘暴是干旱和半干旱气候条件下侵蚀和转移地质材料的重要载体,但人们对沙尘暴在迁移微塑料(MPs)方面的作用却知之甚少。本研究从伊朗东北部偏远地区(萨拉赫斯)采集了当地土壤(n = 20)和暴风雨沉积的尘埃(n = 41)样本,并采用成熟技术测定了微塑料和微橡胶(MRs)的数量和特征。在粉尘中,分别检测到 33 和 17 个 MPs 和 MRs,其浓度中位数和最大值分别为 0.48 和 23.0 MP g-1 和 0.50 和 6.48 MR g-1,沉积通量分别高达约 12 MP m-2 h-1 和 7 MR m-2 h-1。在土壤中,分别检测到 10 个 MPs 和 8 个 MRs,浓度中位数和最大值分别为 0.25 MP g-1 和 1.90 MP g-1 以及 3.27 MR g-1 和 14.3 MR g-1。总体而言,粉尘和土壤中的 MP 与粉尘和土壤中的 MR 之比约为 20,反映出前一类颗粒的流动性更大。这可归因于纤维状 MPs 易于悬浮,而且与碎裂的 MRs 相比,纤维状 MPs 具有更有利的空气动力学特性。对尘埃和土壤中的 MPs 进行比较后发现,具有某些特征(如长、红色和聚丙烯结构)的纤维更倾向于长程飘移,而 HYSPLIT 的后向轨迹建模则表明其次要来源(如土壤)在南部和西南部。沙尘暴是大气中 MPs 和 MRs 的重要区域传播者,随着荒漠化的加剧以及对饮用水和塑料需求的增加,预计沙尘暴的作用会越来越大。
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来源期刊
Aeolian Research
Aeolian Research GEOGRAPHY, PHYSICAL-
CiteScore
7.10
自引率
6.10%
发文量
43
审稿时长
>12 weeks
期刊介绍: The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.
期刊最新文献
An evaluation of different approaches for estimating shear velocity in aeolian research studies Aeolian sand cover on a granite peninsula (Hammeren, Bornholm, Baltic Sea) formed in three episodes during the past 11,600 years Speculation on an early Pleistocene origin of the Parker dunes of southwest Arizona, USA Transport and deposition of microplastics and microrubbers during a dust storm (Sarakhs, northeast Iran) Automatic identification of saltating tracks driven by strong wind in high-speed video using multiple statistical quantities of instant particle velocity
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