The characteristics of African easterly waves coupled to Saharan mineral dust aerosols
The characteristics of African easterly waves coupled to Saharan mineral dust aerosols
复制标题
非洲东风波与撒哈拉矿物尘埃气溶胶耦合的特征
DOI：
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发表时间：
2017
影响因子：
8.9
通讯作者：
C. Thorncroft
中科院分区：
文献类型：
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作者：
D. Grogan;C. Thorncroft
利用《现代回顾分析研究与应用》第2版（MERRA‐2）的37个夏季（1980-2016年7月- 9月）的三维场，研究了非洲东风波（AEWs）的特征及其与撒哈拉矿物尘（SMD）天气尺度羽流的关系。AEWs和SMD羽流是通过在北非西海岸（15°N, 15°W）附近2-6天的时间过滤气溶胶光学深度（AOD）上投影运动学、热力学和尘埃场而获得的。结果表明，预警机的运动场在非洲东风急流（AEJ）以北具有明显的结构。对于SMD，相对于非洲上空的AEW，信号出现在两个区域：在萨赫勒（10-20°N）的AEW槽前面的北风，以及在撒哈拉（20-27°N）的AEW槽后面的南风。SMD信号在与北方环流相关的低压系统侧翼发射，在600 hPa以下的上升区域垂直混合，并被干湿沉积过程去除。在东大西洋上空，预警机的运动场减弱，改变了SMD信号的传播。因此，来自两个源的SMD信号在大西洋上空的撒哈拉空气层（SAL）合并。
The characteristics of African easterly waves (AEWs) and their relationship with synoptic‐scale plumes of Saharan mineral dust (SMD) are examined using 37 summers (July–September, 1980–2016) of 3‐D fields from the Modern‐Era Retrospective analysis for Research and Applications, version 2 (MERRA‐2). The AEWs and SMD plumes are obtained by projecting the kinematic, thermodynamic and dust fields onto the 2–6‐day time‐filtered aerosol optical depth (AOD) near the west coast of North Africa (15°N, 15°W). Results show that the kinematic fields of the AEWs have significant structure north of the African easterly jet (AEJ). For the SMD, signals occur in two regions relative to the AEW over Africa: in the northerlies ahead of the AEW trough in the Sahel (10–20°N), and in the southerlies behind the AEW trough in the Sahara (20–27°N). The SMD signals are emitted on the flanks of a low surface‐pressure system associated with the northern circulation, mixed vertically in ascent regions below 600 hPa and removed by dry and wet deposition processes. Over the eastern Atlantic Ocean, the kinematic fields of the AEWs weaken, which modifies the propagation of the SMD signals. Consequently, the SMD signals from the two sources merge in the Saharan air layer (SAL) over the Atlantic.
影响因子：
3.1
作者：
Florian Pantillon;P. Knippertz;J. Marsham;C. Birch
通讯作者：
Florian Pantillon;P. Knippertz;J. Marsham;C. Birch
撒哈拉沙尘与非洲东风急流的非线性演化——非洲东风波系统
影响因子：
3.1
作者：
Grogan, Dustin F.;Nathan, Terrence R.;Chen, Shu-Hua
通讯作者：
Chen, Shu-Hua