Asian dust transported one full circuit around the globe
Asian dust transported one full circuit around the globe
复制标题
亚洲沙尘绕地球一圈
DOI：
10.1038/ngeo583
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发表时间：
2009-08-01
影响因子：
18.3
通讯作者：
Sugimoto, Nobuo
中科院分区：
文献类型：
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作者：
Uno, Itsushi;Eguchi, Kenta;Sugimoto, Nobuo
矿物粉尘通常在对流层低层中进行长距离输送。有亚洲尘埃穿越太平洋的例子（1-7），在格陵兰岛（8）和法国阿尔卑斯山（9）的冰雪芯中也发现了亚洲尘埃的痕迹。在这里，我们使用云-气溶胶激光雷达与正交偏振（10），空气包裹轨迹模型和三维气溶胶传输模型的测量，以映射2007年5月在中国的塔克拉玛干沙漠风暴期间产生的沙尘云的传输。结果表明，沙尘云在13天内被抬升到距地球表面8-10 km的对流层上层，并绕地球仪运行了一个完整的圈。当尘埃第二次到达西北太平洋时，大规模高压系统的下沉使其下降到对流层低层，其中一些尘埃随后沉积在海洋上。我们的分析还表明，尘埃颗粒可能在这些高空云中充当冰核，导致卷云的形成。我们认为，亚洲尘埃可以影响全球辐射收支刺激卷云的形成和海洋生态系统提供营养物质的开放的海洋。
Mineral dust is usually transported long distances in the lower troposphere. There are examples of Asian dust being transported across the Pacific Ocean(1-7), and traces of Asian dust have also been found in ice and snow cores in Greenland(8) and the French Alps(9). Here, we use measurements from the Cloud-Aerosol Lidar with Orthogonal Polarization(10), an air parcel trajectory model and a three-dimensional aerosol transport model to map the transport of dust clouds generated during a storm in China's Taklimakan Desert during May 2007. We show that the dust-veiled clouds were lofted to the upper troposphere around 8-10 km above the Earth's surface and transported more than one full circuit around the globe in about 13 days. When the dust reached the northwestern Pacific Ocean for the second time, the subsidence of a large-scale high-pressure system caused it to descend into the lower troposphere; some of the dust was then deposited over the ocean. Our analysis also indicates that the dust particles may have acted as ice nuclei in these high-altitude clouds, leading to the formation of cirrus clouds. We suggest that Asian dust can influence the global radiation budget by stimulating cirrus cloud formation and marine ecosystems by supplying nutrients to the open ocean.