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首页> 外文期刊>International Journal of Climatology: A Journal of the Royal Meteorological Society >Variability of the subtropical highs, African easterly jet and easterly wave intensities over North Africa and Arabian Peninsula in late summer
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Variability of the subtropical highs, African easterly jet and easterly wave intensities over North Africa and Arabian Peninsula in late summer

机译：夏季末，北非和阿拉伯半岛上的亚热带高压，非洲东风和东风的强度变化

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摘要

The North African climate is analysed for August during a 32-year period using the European Centre for Medium Range Weather Forecast (ECMWF) global data set to investigate the intensity variability at 600mb of the subtropical highs, Africa easterly jet (AEJ) with two embedded local wind maxima, and African easterly waves over North Africa and the Arabian Peninsula. The variability of these synoptic weather systems is higher in East Africa. The most noticeable variability of intensity occurred with easterly waves. Maintenance of easterly waves from the Arabian Peninsula into East Africa is dependent on strong zonal gradients from the AEJ through shear vorticity. These zonal gradients were induced by the strengthening of the subtropical highs and the presence of a westerly jet in Central Africa and south of the Arabian Peninsula. During positive ENSO periods, these systems are generally weaker while in negative periods are stronger. The focus of this research is to investigate the role of the Arabian High and eastern local wind maximum (LWME) on complementing the Saharan High and western local wind maximum (LWMW). It is found that an intense local wind maximum in East Africa helps maintain the easterly waves and their westward propagation from the Arabian Peninsula.
机译：使用欧洲中距离天气预报中心（ECMWF）全球数据集分析了32年内8月的北非气候，以调查亚热带高压600mb处的强度变化，非洲东风急流（AEJ）和两个嵌入式局部风最大，北非和阿拉伯半岛上有非洲东风。在东非，这些天气天气系统的变异性较高。强度最明显的变化发生在东风浪。从阿拉伯半岛进入东非的东风波的维持取决于从AEJ到剪切涡的强烈纬向梯度。这些纬向梯度是由副热带高压的加强和中非和阿拉伯半岛南部的西风急流引起的。在ENSO处于正数期间，这些系统通常较弱，而在负压期间则较强。这项研究的重点是调查阿拉伯高风和东部当地最大风向（LWME）在补充撒哈拉高风和西部当地最大风向（LWMW）中的作用。人们发现，东非的强烈局部风最大有助于维持东风浪及其从阿拉伯半岛向西传播。

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