Direct Radiative Effect of Mineral Dust on the Development of African Easterly Waves in Late Summer, 2003–07
Direct Radiative Effect of Mineral Dust on the Development of African Easterly Waves in Late Summer, 2003–07
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2003-07 年夏末矿物尘对非洲东风波发展的直接辐射影响
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
A. Arking
中科院分区：
文献类型：
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作者：
P. Ma;Kai Zhang;Jainn Shi;T. Matsui;A. Arking
撒哈拉沙尘暴和非洲东风波（AEWs）的事件在热带大西洋东部向西移动。撒哈拉温暖、干燥和多尘的空气层与附近风暴之间的关系一直是相当多争论的主题。在这项研究中，天气研究和预报模式被用来调查的辐射效应的沙尘对发展的AEW在8月和9月，最大的热带气旋活动，在2003年至2007年。模拟结果表明，沙尘辐射强迫增强了环境的对流不稳定性。因此，大多数AEW在尘埃层的存在下增强。洛伦兹能量循环分析表明，沙尘辐射强迫增强了凝结加热，使纬向和涡旋有效位能升高。反过来，有效的势能被有效地转化为涡动动能，其中局部对流翻转起着主要作用。这...
AbstractEpisodic events of both Saharan dust outbreaks and African easterly waves (AEWs) are observed to move westward over the eastern tropical Atlantic Ocean. The relationship between the warm, dry, and dusty Saharan air layer on the nearby storms has been the subject of considerable debate. In this study, the Weather Research and Forecasting model is used to investigate the radiative effect of dust on the development of AEWs during August and September, the months of maximum tropical cyclone activity, in years 2003–07. The simulations show that dust radiative forcing enhances the convective instability of the environment. As a result, most AEWs intensify in the presence of a dust layer. The Lorenz energy cycle analysis reveals that the dust radiative forcing enhances the condensational heating, which elevates the zonal and eddy available potential energy. In turn, available potential energy is effectively converted to eddy kinetic energy, in which local convective overturning plays the primary role. Th...