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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >On the Geomorphic, Meteorological, and Hydroclimatic Drivers of the Unusual 2018 Early Summer Salt Dust Storms in Central Asia
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On the Geomorphic, Meteorological, and Hydroclimatic Drivers of the Unusual 2018 Early Summer Salt Dust Storms in Central Asia

机译:On the Geomorphic, Meteorological, and Hydroclimatic Drivers of the Unusual 2018 Early Summer Salt Dust Storms in Central Asia

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Abstract A series of synoptically forced dust events, including an extreme salt storm from the Aralkum desert, stuck large parts of Central Asia during early summer 2018, causing flight cancellation, widespread haze, and salt deposition on croplands. This manuscript explores the geomorphic, meteorological, and hydroclimatic drivers of the unusual dust activity based on the three prerequisite factors of dust outbreak: sediment supply, sediment availability, and dust‐uplifting winds. Dry lake beds and lower river floodplains are identified as the source area of frequent dust episodes likely due to the abundant supply of fine‐grain sediments. Whereas, minimal dust activity was detected at the region's major sandy deserts. The salt dust storms were triggered by cold intrusion and strong postfrontal winds at the southeast flank of a rapidly developing anticyclone over western Russia which was enhanced by the Scandinavian blocking upstream. The 2018 early summer dust events in Central Asia were identified as part of spatially compounding weather hazards linked to a slow‐moving synoptic wave pattern across the Northern Hemisphere midlatitudes. Finally, the aeolian sediment availability at the dust source areas was enhanced by below‐average soil moisture and vegetation during summer 2018 linked to reduced precipitation in the preceding winter. The 2017/18 winter precipitation deficit was driven by a double‐dip, Central Pacific La Niña episode associated with large‐scale precipitation‐suppressing subsidence and enhanced moisture flux divergence over Central Asia.
机译:抽象的概括性地一系列强制灰尘事件,包括从一个极端盐风暴Aralkum沙漠,中亚大部分地区在2018年初夏,造成飞行取消,广泛的阴霾,和盐沉积在农田上。地貌、气象和hydroclimatic司机的不寻常活动基于灰尘三个先决条件因素的尘埃爆发:沉积物供应,沉积物可用性和尘埃的上升气流。河流冲积平原被确定为源地区频繁的发作可能由于灰尘提供充足的细粒沉积物。最小的尘埃活动被检测到地区的大沙漠。入侵和风暴引发的冷强锋后在东南风旁边的快速发展在西方反气旋俄罗斯由北欧增强阻碍上游。事件在中亚发现的一部分空间复合天气灾害有关缓慢移动应承担的综观整个波模式北半球情理之中。风成沉积物尘源的可用性地区加强了,下面的平均土壤水分在2018年夏季与和植被降水量的减少在前面的冬天。2017/18冬季降水赤字由一个双底,中央太平洋拉尼娜现象集与大型规模降水压制沉降和提高水汽通量散度在中亚。

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