On the Convective Coupling and Moisture Organization of East Pacific Easterly Waves
On the Convective Coupling and Moisture Organization of East Pacific Easterly Waves
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DOI：
10.1175/jas-d-15-0056.1
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发表时间：
2015-10
影响因子：
3.1
通讯作者：
A. Rydbeck;E. Maloney
中科院分区：
文献类型：
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作者：
A. Rydbeck;E. Maloney
本文探讨了东太平洋暖池东风波（EWs）局地放大的过程。发展中的EW有利于对流在西南和东北象限的扰动。在新生的EW，对流有利于西南象限。随着西北风的发展，东北象限的对流变得越来越突出，西南象限的对流逐渐减弱。EW水分收支表明，异常纬向风作用于ITCZ的平均纬向湿度梯度，在EW生命周期的早期，在西南象限产生支持对流的湿度异常。随着西风带的成熟，西风带极向一侧的水汽异常开始发展，并得到平均纬向风对异常水汽平流的支持。在有利于对流异常的西风带西南部和东北部，通过垂直拉伸产生对流层低层涡度，支持西风带的水平倾斜，并使西风带水平倾斜。在西风带的西南部和东北部，对流层低层涡度的垂直拉伸产生了局部涡度。在西风带的西南部和东北部，对流层低层涡度的垂直拉伸产生
AbstractProcesses associated with the local amplification of easterly waves (EWs) in the east Pacific warm pool are explored. Developing EWs favor convection in the southwest and northeast quadrants of the disturbance. In nascent EWs, convection favors the southwest quadrant. As the EW life cycle progresses, convection in the northeast quadrant becomes increasingly prominent and southwest quadrant convection wanes. The EW moisture budget reveals that anomalous meridional winds acting on the mean meridional moisture gradient of the ITCZ produce moisture anomalies supportive of convection in the southwest quadrant early in the EW life cycle. As EWs mature, moisture anomalies on the poleward side of the EW begin to grow and are supported by the advection of anomalous moisture by the mean zonal wind.In the southwest and northeast portions of the wave, where convection anomalies are favored, lower-tropospheric vorticity is generated locally through vertical stretching that supports a horizontal tilt of the wav...