Rapid sea-ice loss and warming of the Arctic within the past few decades have contributed to changes in the strength and location of midlatitude jet streams. Using ERA-Interim data for the period 1979–2018, warming of the Arctic compared to midlatitudes and its impact on the waviness and strength of the westerly jet stream over West Asia are investigated. Pre- and post-Arctic amplification periods are defined as 1979–1993 and 2004–2018, respectively. Near-surface temperature variability is decreased in the Arctic in the post-Arctic amplification period when a larger area of open ocean has been exposed to the atmosphere. In both pre- and post-Arctic amplification periods, near-surface temperature variabilities in spring and summer were less than half as much of its variability in winter. During the period 1979–2018, both the Arctic and West Asia have warmed, with much higher warming of the Arctic in autumn and winter. Indeed, in contrast to the continental cooling pattern observed in parts of North and Northeast Asia, West Asia has warmed in recent decades. Following a decrease in the meridional temperature gradient, the upper-tropospheric jet stream over West Asia has been reduced in the post-Arctic amplification period in all seasons except autumn. In the post-Arctic amplification period, the zonal wind shear has been also reduced over West Asia in all seasons, while waviness of the Z500 isopleth has been increased in winter. A higher meridional mid-tropospheric waviness is found over the study region (20–75°E) in summer compared to winter because in summer the western part of this region is influenced by a strong subtropical high pressure, while its eastern part is influenced by the Indian monsoon and associated trough of low pressure.

在过去的几十年中，北极海冰的迅速流失和变暖导致中纬度急流的强度和位置发生了变化。利用1979-2018年期间的ERA-Interim数据，研究了与中纬度相比北极的变暖及其对西亚西风急流的波浪度和强度的影响。北极之前和之后的放大期分别定义为1979–1993年和2004–2018年。当大面积的开放海洋暴露在大气中后，北极地区在北极地区扩张后的后期，近地表温度变化会降低。在北极之前和之后的放大期，春季和夏季的近地表温度变化都不到冬季的近一半。在1979-2018年期间，北极和西亚都变暖了，在秋季和冬季，北极的变暖幅度更大。确实，与在北亚和东北亚部分地区观察到的大陆降温模式相反，西亚在最近几十年中变暖。随着子午温度梯度的减小，除秋季以外的所有季节，在整个北极之后，西亚上空的对流层高空急流都减少了。在北极后的放大期，整个季节的纬向风切变在所有季节也都减小了，而Z500等静角的波纹度在冬天增加了。与冬季相比，夏季整个研究区（20-75°E）的子午线对中波纹度更高，因为在夏季该地区的西部受到强烈的亚热带高压的影响，