On the changing relationship between North Pacific climate variability and synoptic activity over the Hawaiian Islands,International Journal of Climatology

当前位置： X-MOL 学术 › Int. J. Climatol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

On the changing relationship between North Pacific climate variability and synoptic activity over the Hawaiian Islands
International Journal of Climatology ( IF 3.5 ) Pub Date : 2020-08-06 , DOI: 10.1002/joc.6789
Oliver Elison Timm ₁ , Siyu Li _{1,

2} , Jiping Liu ₁ , David W. Beilman ₃

Affiliation

The teleconnection between tropical and extratropical climates in the North Pacific and continental regions of eastern Asia and western North America is known to vary on decadal to multidecadal time scales. In this study, the teleconnection pattern is studied with observational and reanalysis data products. The regional focus is set on the Hawaiian Islands in the central subtropical part of the North Pacific. By analysing correlations between regional climate indices and large‐scale climate modes during the years 1980 and 2014, it was found that the correlation between El Niño—Southern Oscillation (ENSO) and the synoptic weather activity over the Hawaiian Islands decreased over time. Composite analysis of the geopotential height anomalies and upper level winds suggest that the systematic shift in the North Pacific Jet (NPJ) position had an impact on the teleconnection between tropical Pacific SST and winter storm activity and precipitation variability in Hawai'i. The change in the correlations and in the NPJ structure coincides with a transition from the positive phase of the Pacific Decadal Oscillation (PDO) towards a neutral and weak negative state. This observation‐based study provides a central subtropical Pacific viewpoint in support of the growing body of research studies that have reported a major shift in the Pacific climate system during the mid‐1990s. The article further discusses the potential role of decadal‐scale changes in the North Pacific Oscillation (NPO) phase in changing the strength of the ENSO teleconnection with synoptic activity over the Hawaiian Islands. The results of this study are relevant to paleoclimate interpretation of individual proxy records as well as for regional downscaling of future rainfall for the Hawaiian Islands.

中文翻译：

关于北太平洋气候变化与夏威夷群岛天气活动之间关系的变化

众所周知，北太平洋的热带和温带气候以及东亚和北美洲西部的大陆地区之间的遥相关性在十年到几十年的时间尺度上是不同的。在这项研究中，通过观察和再分析数据产品研究了远程连接模式。区域重点放在北太平洋中亚热带地区的夏威夷群岛上。通过分析1980年和2014年区域气候指数与大规模气候模式之间的相关性，发现厄尔尼诺—南方涛动（ENSO）与夏威夷群岛天气天气活动之间的相关性随时间而降低。对地势高度异常和高空风的综合分析表明，北太平洋急流（NPJ）位置的系统性变化影响了热带太平洋海表温度与夏威夷冬季风暴活动和降水变化之间的遥相关。相关性和NPJ结构的变化与从太平洋年代际振荡（PDO）的正相向中性和弱的负态的转变相吻合。这项基于观察的研究提供了亚热带太平洋中部的观点，以支持越来越多的研究，这些研究报告了1990年代中期太平洋气候系统发生了重大变化。本文进一步讨论了北太平洋涛动（NPO）年代年代际尺度变化在改变ENSO遥相关带的强度和夏威夷群岛天气活动中的潜在作用。这项研究的结果与单个代理记录的古气候解释以及夏威夷群岛未来降雨的区域缩减有关。

更新日期：2020-08-06

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11