Three-Dimensional Structure and Evolution of the Moisture Field in the MJO
Three-Dimensional Structure and Evolution of the Moisture Field in the MJO
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DOI：
10.1175/jas-d-15-0003.1
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发表时间：
2015-10
影响因子：
3.1
通讯作者：
Á. Adames;J. Wallace
中科院分区：
文献类型：
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作者：
Á. Adames;J. Wallace
利用850- 150 hPa全球速度势资料，用线性分析方法研究了确定MJO相关水汽场和降水场结构和演变的大尺度环流特征。分析是由一个合成过程，强调了结构特征的印度太平洋暖池部门（60°E-180°）的边界层辐合，使对流层中层增湿，并在最大上升高度区以东的低层东风气流中产生一条深而窄的赤道上升羽流，而在BL之上的弱分流则将水分从赤道向外扩散。来自上升羽流的水汽垂直平流解释了正水汽异常向东传播穿过海洋大陆进入西太平洋的原因。当对流首先在印度洋上发展时，何...
AbstractThe large-scale circulation features that determine the structure and evolution of MJO-related moisture and precipitation fields are examined using a linear analysis protocol based on daily 850- minus 150-hPa global velocity potential data. The analysis is augmented by a compositing procedure that emphasizes the structural features over the Indo-Pacific warm pool sector (60°E–180°) that give rise to the eastward propagation of the enhanced moisture and precipitation.It is found that boundary layer (BL) convergence in the low-level easterlies to the east of the region of maximum ascent produces a deep but narrow plume of equatorial ascent that moistens the midtroposphere, while weakly diffluent flow above the BL spreads moisture away from the equator. Vertical advection of moisture from this plume of ascent accounts for the eastward propagation of the positive moisture anomalies across the Maritime Continent into the western Pacific. When the convection is first developing over the Indian Ocean, ho...