Dust Hotspot in the Gobi Desert: A Field Survey in April 2019
Dust Hotspot in the Gobi Desert: A Field Survey in April 2019
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DOI：
10.2151/sola.2021-023
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发表时间：
2021-07-30
期刊：
影响因子：
1.9
通讯作者：
Davaanyam, Enkhbaatar
中科院分区：
文献类型：
--
作者：
Kai, Kenji;Kawai, Kei;Davaanyam, Enkhbaatar
戈壁沙漠是亚洲大陆的主要沙尘来源。在这项研究中，我们分析了典型的蒙古沙尘暴的特征，并确定了戈壁沙漠中一个突出的沙尘热点。 2019年4月28日，我们从蒙古首都乌兰巴托到戈壁滩达兰扎德嘎德进行实地考察时，遇到了一场典型的沙尘暴，呈现出明显的沙墙。沙尘暴的风头在我们车辆前方几公里处穿过了马路。风暴的头部高度为600 m，其结构表明沙尘暴是由重力流引起的。我们进入沙尘暴前沿，测得最大风速为18.2 m/s，能见度不足10 m。 7μm处的归一化粉尘数浓度为59cm±3。此外，Himawari-8 Dust RGB 图像显示沙尘暴发生在地形辐合带。该区域连接了夹在戈壁沙漠三座山脉之间的两个山谷：康盖山、阿尔泰山和古尔万赛汗山。我们的研究结果表明，该区域是戈壁沙漠中一个显着的沙尘热点区域。 （引文：Kai, K.、K. Kawai、A. Ito、Y. Aizawa、Y. Minamoto、E. Munkhjargal 和 E. Davaanyam 2021：戈壁沙漠的沙尘热点：2019 年 4 月的实地调查。SOLA，17, 130 + 133， doi:10.2151/sola.2021-023.)上标/下标可用
The Gobi Desert is a dominant source of dust on the Asian continent. In this study, we analysed the characteristics of a typical Mongolian dust storm and identified a prominent dust hotspot in the Gobi Desert. During a field survey from Ulaanbaatar (the capital of Mongolia) to Dalanzadgad in the Gobi Desert, we encountered a typical dust storm on 28 April 2019, exhibiting a distinct dust wall. The head of the dust storm crossed the road several kilometres ahead of our vehicle. The head of the storm had a height of 600 m, and its structure suggested that the dust storm was induced by a gravity current. We entered the front of the dust storm and measured a maximum wind speed of 18.2 m/s and a visibility of less than 10 m. The normalized dust number concentration at 7 mu m was 59 cm & minus;3. Moreover, Himawari-8 Dust RGB imagery showed that the dust storm occurred in an orographic convergence zone. This zone connects two valleys that are sandwiched between three mountains in the Gobi Desert: the Khangai, Altai, and Gurvan Saikhan Mountains. Our results suggest that this zone is a remarkable dust hotspot in the Gobi Desert. (Citation: Kai, K., K. Kawai, A. Ito, Y. Aizawa, Y. Minamoto, E. Munkhjargal, and E. Davaanyam 2021: Dust hotspot in the Gobi Desert: A field survey in April 2019. SOLA, 17, 130 & minus;133, doi:10.2151/sola.2021-023.)Superscript/Subscript Available