Abstract

An analysis is carried out to estimate features of the atmospheric centers of action (ACA) in the Northern and Southern hemispheres using different long-term reanalysis data. The variability of ACAs and their relation to the hemispheric temperature and key climatic modes, including the El Niño–Southern Oscillation, Atlantic Multidecadal Oscillation, and Pacific Decadal Oscillation is analyzed. According to long-term data, it is found that the centennial hemispheric warming is accompanied by a significant weakening of the polar highs and the Greenland High that is more significant in summer. The deepening of the Icelandic Low, especially in summer, and the Aleutian Low, especially in winter, is shown. A significant weakening of the winter Siberian and North American highs and a deepening of the summer North American Low are also revealed. In the Southern Hemisphere, all three subpolar oceanic lows and the Mascarene High significantly intensify under warming conditions, while the summer Australian and South African lows weaken.

中文翻译：

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北半球和南半球的大气行动中心：特征和变异性

摘要

使用不同的长期再分析数据，进行了分析，以估计北半球和南半球的大气作用中心（ACA）的特征。分析了ACA的变异性及其与半球温度和关键气候模式的关系，包括厄尔尼诺-南方涛动，大西洋多年代际涛动和太平洋年代际涛动。根据长期数据，发现百年半球变暖伴随着极地高点的显着减弱，而格陵兰高地则在夏季更为显着。显示了冰岛低谷的加深，尤其是在夏季，而阿留申低谷，尤其是在冬季，则在加深。还揭示了冬季西伯利亚和北美高点的显着减弱以及夏季北美低点的加深。