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Connection Between Antarctic Ozone and Climate: Interannual Precipitation Changes in the Southern Hemisphere
Atmosphere ( IF 2.5 ) Pub Date : 2020-06-01 , DOI: 10.3390/atmos11060579
Alessandro Damiani , Raul R. Cordero , Pedro J. Llanillo , Sarah Feron , Juan P. Boisier , Rene Garreaud , Roberto Rondanelli , Hitoshi Irie , Shingo Watanabe

In this study, we explored the connection between anomalies in springtime Antarctic ozone and all-year precipitation in the Southern Hemisphere by using observations from 1960–2018 and coupled simulations for 1960–2050. The observations showed that this correlation was enhanced during the last several decades, when a simultaneously increased coupling between ozone and Southern Annular Mode (SAM) anomalies became broader, covering most of the following summer and part of the previous winter. For eastern Australia, the ozone–precipitation connection shows a greater persistence toward the following summer than for other regions. On the other hand, for South America, the ozone–precipitation correlation seems more robust, especially in the early summer. There, the correlation also covers part of the previous winter, suggesting that winter planetary waves could affect both parameters. Further, we estimated the sensitivity of precipitation to changes in Antarctic ozone. In both observations and simulations, we found comparable sensitivity values during the spring–summer period. Overall, our results indicate that ozone anomalies can be understood as a tracer of stratospheric circulation. However, simulations indicate that stratospheric ozone chemistry still contributes to strengthening the interannual relationship between ozone and surface climate. Because simulations reproduced most of the observed connections, we suggest that including ozone variability in seasonal forecasting systems can potentially improve predictions.

中文翻译:

南极臭氧与气候之间的联系:南半球的年际降水变化

在这项研究中,我们使用1960–2018年的观测结果和1960–2050年的模拟结果,探讨了春季南极臭氧异常与南半球全年降水之间的联系。观测结果表明,在过去的几十年中,当臭氧与南环空模式(SAM)异常之间同时增加的耦合变大时,这种相关性得到了增强,涵盖了随后的夏季的大部分时间和之前的冬季的部分时间。与其他地区相比,在澳大利亚东部,臭氧与降水的联系对下个夏天表现出更大的持久性。另一方面,对于南美而言,臭氧与降水的相关性似乎更强,尤其是在初夏。那里的相关性还涵盖了以前冬季的一部分,这表明冬季行星波可能会影响这两个参数。此外,我们估计了降水对南极臭氧变化的敏感性。在观察和模拟中,我们都发现了春夏季期间可比较的灵敏度值。总体而言,我们的结果表明,臭氧异常可以理解为平流层环流的示踪剂。然而,模拟表明,平流层臭氧化学仍然有助于加强臭氧与地表气候之间的年际关系。因为模拟重现了大多数观察到的联系,所以我们建议在季节预报系统中包括臭氧变化性可能会改善预报。在观察和模拟中,我们都发现了春夏季期间可比较的灵敏度值。总体而言,我们的结果表明,臭氧异常可以理解为平流层环流的示踪剂。但是,模拟表明,平流层臭氧化学仍然有助于加强臭氧与地表气候之间的年际关系。因为模拟重现了大多数观察到的联系,所以我们建议在季节预报系统中包括臭氧的变化可能会改善预报。在观察和模拟中,我们都发现了春夏季期间可比较的灵敏度值。总体而言,我们的结果表明,臭氧异常可以理解为平流层环流的示踪剂。但是,模拟表明,平流层臭氧化学仍然有助于加强臭氧与地表气候之间的年际关系。因为模拟重现了大多数观察到的联系,所以我们建议在季节预报系统中包括臭氧变化性可能会改善预报。模拟表明,平流层臭氧化学仍然有助于加强臭氧与地表气候之间的年际关系。因为模拟重现了大多数观察到的联系,所以我们建议在季节预报系统中包括臭氧的变化可能会改善预报。模拟表明,平流层臭氧化学仍然有助于加强臭氧与地表气候之间的年际关系。因为模拟重现了大多数观察到的联系,所以我们建议在季节预报系统中包括臭氧变化性可能会改善预报。
更新日期:2020-06-01
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