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Variability of the low-level circulation of the South American Monsoon analysed with complex networks
The European Physical Journal Special Topics ( IF 2.8 ) Pub Date : 2021-06-21 , DOI: 10.1140/epjs/s11734-021-00187-w
Maximilian Gelbrecht , Niklas Boers , Jürgen Kurths

Understanding the variability of low-level atmospheric circulation regimes is key for understanding the dynamics of monsoon systems. The South American Monsoon is characterized by strong year-long trade winds that are channeled southward into the South American Low-Level Jet after crossing the Amazon basin, which in turn is elementary for the moisture transport to Southern South America. In this study, we utilize streamflow wind networks, a type of climate networks that tracks the local flow of the wind field, together with the analysis of composites of wind, precipitation, and geopotential height fields, to investigate the variability of the South American low-level circulation. The streamflow wind networks are used here as they are able to directly track the wind flow and encode its spatiotemporal characteristics in their topology. We focus on intraseasonal variations in terms of active and break monsoon phases on the one hand, and on the interannual variability in terms of the impacts of the El Niño-Southern Oscillation on the other hand. Our findings highlight the importance of the South American Low-Level Jet, its spatial position and variability. Our study reveals the relation of the active and break regimes to anomalous high- and low-pressure systems over the southern Atlantic that are connected to Rossby wave trains from the southern Pacific, as well as the impact of these regimes on the cross-equatorial low-level flow. In addition, the streamflow networks that we use demonstrate significant shifts of the dominant wind flow pattern during El Niño and La Niña episodes.



中文翻译:

用复杂网络分析南美季风低层环流的变异性

了解低层大气环流状态的变化是了解季风系统动力学的关键。南美季风的特点是全年强劲的信风在穿越亚马逊盆地后向南引入南美低空急流,这反过来又是水分输送到南美洲南部的基本要素。在这项研究中,我们利用流流风网络,一种跟踪风场局部流动的气候网络,以及对风、降水和位势高度场的复合分析,来研究南美低气压的变异性。级循环。这里使用流风网络,因为它们能够直接跟踪风流并在其拓扑结构中编码其时空特征。我们一方面关注活跃和中断季风阶段的季节内变化,另一方面关注厄尔尼诺 - 南方涛动影响的年际变化。我们的研究结果强调了南美低空急流的重要性、它的空间位置和可变性。我们的研究揭示了活动和断裂状态与南大西洋上空异常高压和低压系统之间的关系,这些系统与来自南太平洋的罗斯比波列相连,以及这些状态对跨赤道低压的影响级流。此外,我们使用的水流网络展示了厄尔尼诺和拉尼娜事件期间主导风流模式的显着变化。另一方面,关于厄尔尼诺-南方涛动影响的年际变化。我们的研究结果强调了南美低空急流的重要性、它的空间位置和可变性。我们的研究揭示了活动和断裂状态与南大西洋上空异常高压和低压系统之间的关系,这些系统与来自南太平洋的罗斯比波列相连,以及这些状态对跨赤道低压的影响级流。此外,我们使用的水流网络展示了厄尔尼诺和拉尼娜事件期间主导风流模式的显着变化。另一方面,关于厄尔尼诺-南方涛动影响的年际变化。我们的发现强调了南美低空急流的重要性、它的空间位置和可变性。我们的研究揭示了活动和断裂状态与南大西洋上空异常高压和低压系统之间的关系,这些系统与来自南太平洋的罗斯比波列相连,以及这些状态对跨赤道低压的影响级流。此外,我们使用的水流网络展示了厄尔尼诺和拉尼娜事件期间主导风流模式的显着变化。其空间位置和可变性。我们的研究揭示了活动和断裂状态与南大西洋上空异常高压和低压系统之间的关系,这些系统与来自南太平洋的罗斯比波列相连,以及这些状态对跨赤道低压的影响级流。此外,我们使用的水流网络展示了厄尔尼诺和拉尼娜事件期间主导风流模式的显着变化。其空间位置和可变性。我们的研究揭示了活动和断裂状态与南大西洋上空异常高压和低压系统之间的关系,这些系统与来自南太平洋的罗斯比波列相连,以及这些状态对跨赤道低压的影响级流。此外,我们使用的水流网络展示了厄尔尼诺和拉尼娜事件期间主导风流模式的显着变化。

更新日期:2021-06-22
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