Effect of Regional Hadley Circulation-Subtropical Jet Interaction: The Amplification of Central-Pacific ENSO-Induced Teleconnection Pattern

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-04-30 DOI:10.1029/2025GL115344

Weihan Ma, Ya Wang, Yujie Miao, Xichen Li

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Abstract

The Pacific North America (PNA), a major teleconnection pattern in North Pacific atmospheric variability, is tightly linked to El Niño-Southern Oscillation (ENSO)-related sea surface temperature (SST) forcing. This study examines the relative effects of eastern Pacific (EP) and central Pacific (CP) ENSO in driving the PNA teleconnection during boreal autumn. Results show that CP SST anomalies are significantly more efficient, with a one-degree CP anomaly inducing more than twice the circulation changes of an equivalent EP anomaly. Two factors contribute to this difference: CP warming triggers stronger atmospheric convection, and the associated regional Hadley circulation (HC) anomaly is broader and shifted westward compared to that induced by EP warming. This enhances interaction with the subtropical jet, strengthening the Rossby wave source. These findings underscore the pivotal role of regional HC in amplifying atmospheric teleconnection patterns, highlighting its importance amid the increasing frequency of CP ENSO events under a changing climate.

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区域哈德利环流-副热带急流相互作用的影响：中太平洋enso引起的遥相关型的放大

太平洋北美（PNA）是北太平洋大气变率的一个主要遥相关型，与El Niño-Southern涛动（ENSO）相关的海温（SST）强迫密切相关。本研究探讨了东太平洋（EP）和中太平洋（CP） ENSO在北方秋季驱动PNA遥相关中的相对影响。结果表明，CP海温异常明显更有效，1度CP异常引起的环流变化是等效EP异常的两倍以上。造成这种差异的原因有两个：CP变暖触发了更强的大气对流，与EP变暖相比，相关的区域Hadley环流（HC）异常更宽且向西移动。这加强了与副热带急流的相互作用，增强了罗斯比波源。这些发现强调了区域HC在放大大气遥相关模式中的关键作用，强调了其在气候变化下CP ENSO事件频率增加的重要性。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.