Extensive dust outbreaks following the morning inversion breakup in the Taklimakan Desert
Extensive dust outbreaks following the morning inversion breakup in the Taklimakan Desert
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DOI：
10.1029/2005jd005994
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发表时间：
2005-11
影响因子：
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通讯作者：
N. Tsunematsu;Tomonori Sato;F. Kimura;K. Kai;Y. Kurosaki;T. Nagai;Hongfei Zhou;M. Mikami
中科院分区：
文献类型：
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作者：
N. Tsunematsu;Tomonori Sato;F. Kimura;K. Kai;Y. Kurosaki;T. Nagai;Hongfei Zhou;M. Mikami
[1]2004年3月26日上午晚些时候，塔克拉玛干沙漠发生了大范围的沙尘暴。AQUA卫星的图像显示，沙尘暴爆发为一场巨大的沙尘暴，在沙漠的东西方向延伸了1000公里。地面激光雷达成功地观测到了沙尘暴。从近地面到海拔6公里高度的后向散射比的值迅速增加，只要沙尘暴覆盖的激光雷达观测站点。包括扩散试验在内的数值试验表明，早晨逆温破裂后，地面出现强西风，从而诱发沙尘暴。夜间逆温层阻止了强烈的西风传播到地表，直到系统解体。塔克拉玛干沙漠深盆地形有利于冷空气团的积累，是夜间逆温形成的主要地区。这些结果表明，除了地面风的强度外，行星边界层的稳定性是沙尘爆发的一个极其重要的因素，特别是在盆地沙漠中。这说明沙漠沙尘暴的发生频率具有明显的日变化。
[1] Extensive dust outbreaks occurred on the late morning of 26 March 2004 in the Taklimakan Desert. An image by the satellite AQUA shows the dust outbreaks as an enormous dust storm extending as far as 1000 km in the direction of east and west across the desert. A ground-based lidar was successful in observing the dust storm. Values of the backscattering ratio from near the ground surface to an altitude of 6 km above sea level rapidly increased as soon as the dust storm covered the lidar observation site. Numerical experiments including a diffusion experiment revealed that strong westerly winds appeared at the surface level following the morning inversion breakup and then induced the dust outbreaks. The nocturnal inversion layer prevented the strong westerly winds from spreading to the surface level until the breakup. Notable nocturnal inversion is considered to be easily formed in the Taklimakan Desert because of its deep basin topography which can accumulate cold air masses. These results show the stability of the planetary boundary layer to be an extremely important factor in dust outbreaks especially in basin deserts, in addition to the intensity of surface winds. This implies that the occurrence frequency of dust storms in the desert has a diurnal cycle.