Spatial distribution of threshold wind speeds for dust outbreaks in northeast Asia
Spatial distribution of threshold wind speeds for dust outbreaks in northeast Asia
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DOI：
10.1016/j.geomorph.2009.07.014
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发表时间：
2010-01
期刊：
影响因子：
3.9
通讯作者：
R. Kimura;M. Shinoda
中科院分区：
文献类型：
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作者：
R. Kimura;M. Shinoda
亚洲沙尘暴在中国和蒙古等沙尘源区造成人畜健康影响和农业损失，在日本和韩国造成“黄沙”事件。最好能建立一个早期预警系统来帮助防止这种损害。本文利用蒙古站的观测资料，结合以往的研究资料，模拟了东北亚地区（35°-45 ° N，100°-115 ° E）沙尘事件的阈值风速的空间分布。利用归一化植被指数（NDVI）的地图，我们估计的空间分布的植被覆盖，粗糙度长度，阈值摩擦速度和阈值风速。我们还认识到，在沙尘季节和最大的NDVI在前一年的NDVI之间的关系。因此，它可能是可能的，在下一个沙尘季节预测阈值风速在使用上一年的最大NDVI。
Asian windblown dust events cause human and animal health effects and agricultural damage in dust source areas such as China and Mongolia and cause “yellow sand” events in Japan and Korea. It is desirable to develop an early warning system to help prevent such damage. We used our observations at a Mongolian station together with data from previous studies to model the spatial distribution of threshold wind speeds for dust events in northeast Asia (35°–45°N and 100°–115°E). Using a map of Normalized Difference Vegetation Index (NDVI), we estimated spatial distributions of vegetation cover, roughness length, threshold friction velocity, and threshold wind speed. We also recognized a relationship between NDVI in the dust season and maximum NDVI in the previous year. Thus, it may be possible to predict the threshold wind speed in the next dust season using the maximum NDVI in the previous year.