Atlantic Multidecadal Oscillation modulates the relationship between El Nino-Southern Oscillation and fire weather in Australia

被引：4

作者：

Liu, Guanyu ^{[1
]}

Li, Jing ^{[1
]}

Ying, Tong ^{[1
]}

机构：

[1] Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Beijing 100871, Peoples R China

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2023年 / 23卷 / 16期

基金：

中国国家自然科学基金;

关键词：

TROPICAL ATLANTIC; VARIABILITY; DRIVERS; NORTH; ENSO; PROPAGATION; RAINFALL; IMPACT;

D O I：

10.5194/acp-23-9217-2023

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The El Nino-Southern Oscillation (ENSO) is a crucial driver of fire weather in Australia, with the correlation between ENSO and Australian fire weather having intensified over the past 2 decades. However, the underlying causes for this change have not been thoroughly investigated. In this study, we utilize reanalysis datasets and numerical model simulations to demonstrate that the Atlantic Multidecadal Oscillation (AMO) could potentially modulate the ENSO-Australian fire weather relationship. The correlation between ENSO and the Australian Fire Weather Index (FWI) increases from 0.17 to 0.70 as the AMO transitions from its negative to positive phase. This strengthening effect can be attributed to atmospheric teleconnection mechanisms. Specifically, the positive AMO phase, characterized by warming in the northern and tropical Atlantic, generates Rossby wave trains, leading to high-pressure systems over Australia. Consequently, local temperature and wind speed increase, while precipitation decreases. This signal, superimposed on ENSO, serves to amplify the ENSO effect on Australian fire weather.

引用

页码：9217 / 9228

页数：12

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