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Local climate impacts of dipole-like sea surface temperature oscillations in the Southern Hemisphere
Journal of Water & Climate Change ( IF 2.8 ) Pub Date : 2021-03-01 , DOI: 10.2166/wcc.2020.113
Jeseung Oh 1 , Yong Jung 2
Affiliation  

Dipole phenomena in ocean-atmospheric variability such as the Indian Ocean Dipole have been recognized as important factors that greatly affect local climates. This study presents evidence of two dipole modes in sea surface temperature anomaly (SSTA) over high latitude Southern Hemisphere (one in South Pacific and one in South Indian Ocean), identified using empirical orthogonal functions and cross-correlation analysis. These dipole modes have interannual periodicity, which is also explored for their seasonal variability and modes. Herein, a dipole mode is defined as a quasi-periodic oscillation between positive and negative phases in the various climate proxies, though predominantly in SST, which is supported by the signal's synchronized relationship with atmospheric variability (as recorded by pressure and wind records). In addition, the dipole modes have a clear synchronization relationship to local precipitation records, which is described in this paper. For this purpose, an index to represent the time-dependent evolution of each dipole mode and to better define and understand the teleconnections of the dipole modes with other climate variables was defined. The findings described here provide a more precise and unique understanding of the globally distributed SSTA teleconnections and climate's synchronized dynamics than that has currently been studied.



中文翻译:

南半球偶极状海面温度振荡对当地气候的影响

海洋大气变化中的偶极子现象,例如印度洋偶极子,已经被认为是极大地影响当地气候的重要因素。本研究提供了使用经验正交函数和互相关分析确定的高纬度南半球海表温度异常(SSTA)中的两种偶极子模式的证据(一种在南太平洋,一种在南印度洋)。这些偶极子模式具有年际周期性,也对其季节性变化和模式进行了探索。在这里,偶极子模式定义为各种气候代理中正相和负相之间的准周期振荡,尽管主要发生在SST中,这由信号与大气变化的同步关系支持(如压力和风记录所记录)。此外,偶极子模式与当地降水记录具有明显的同步关系,本文对此进行了描述。为此,定义了一个指数来表示每个偶极子模式随时间的变化,并更好地定义和理解偶极子模式与其他气候变量的遥相关。与目前研究的结果相比,此处描述的发现提供了对全球分布式SSTA远程连接和气候同步动态的更精确和独特的理解。

更新日期:2021-03-27
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