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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Characteristics of Dust Emission in the Mongolian Steppe during the 2008 DUVEX Intensive Observational Period
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Characteristics of Dust Emission in the Mongolian Steppe during the 2008 DUVEX Intensive Observational Period

机译：2008年DUVEX集约化观测期蒙古草原的粉尘排放特征

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References(21) Cited-By(21) Supplementary materials(3) The joint Japan-Mongolia-USA project DUVEX (Dust-Vegetation Interaction Experiment) was designed to develop a biogeophysical model which can simulate dust emission and ecosystem processes over the vegetated land surface. Dust emission processes have been investigated mostly on bare land, and there is very little information about vegetated land. Thus, intensive observations were conducted of a dust event that occurred on the Mongolian steppe on 24 April 2008. Meteorological and dust elements (e.g., saltation flux, visibility, dust concentration) and land-surface parameters (e.g., roughness length, vegetation cover, and the ground-based normalized difference vegetation index) were measured. During the event (from 13:00 to 18:00 LST on 24 April), the threshold wind speed at 1.54 m height, which is the minimum wind speed inducing saltation of particles ranging from 30 to 667 μm in diameter, was 8.9 m s-1 on a land surface with 7.2% vegetation cover with dead brown leaves, a small roughness length (0.0058 m), and a very dry sandy soil at 0-5 mm depth (water content, 0.002 g g-1). For comparison with previous studies, the threshold wind speed value was converted to the values at the heights in each study by using the logarithmic law of wind profile. Our value is close to the SYNOP-derived values for the same area, but larger than ground-observed and SYNOP-derived values for East Asian deserts.
机译：参考文献（21）被引用的文献（21）补充材料（3）日本-蒙古-美国的联合项目DUVEX（粉尘-植物相互作用试验）旨在开发一种生物地球物理模型，该模型可以模拟植被​​土地上的粉尘排放和生态系统过程表面。尘埃排放过程主要在光秃秃的土地上进行调查，关于植被土地的信息很少。因此，我们对2008年4月24日蒙古草原发生的一次尘埃事件进行了深入观察。气象和尘埃元素（例如盐分通量，能见度，尘埃浓度）和地表参数（例如粗糙度，植被覆盖度，和地基归一化差异植被指数）。在活动期间（4月24日LST 13:00至18:00），在1.54 m高的阈值风速为8.9 m s，这是引起直径从30到667μm的颗粒盐化的最小风速。 -1在具有7.2％植被覆盖且有枯褐色叶子，不平整长度（0.0058 m）和非常干燥的沙质土壤（0-5毫米深度）（水含量，0.002 g g-1）的陆地表面上。为了与以前的研究进行比较，使用风廓线的对数定律将阈值风速值转换为每个研究中的高度值。我们的值接近于同一地区的SYNOP值，但大于东亚沙漠的地面观测和SYNOP值。

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