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在周期性ENSO事件加上印度洋双极模式和热带北大西洋变暖期间,亚马逊盆地极端干旱

Leonardo Mamani¹, Rita V Andreoli², Itamara Parente de Souza³

¹Programa de Pós-Graduação em Clima e Ambiente, Instituto Nacional de Pesquisas da Amazônia, Universidade do Estado do Amazonas, Av. André Araújo, 2936, Bairro Aleixo, 69060-001 Manaus, AM, Brazil.

The Science of the total environment

|January 17, 2025

概括

极端的亚马逊干旱是由厄尔尼诺 - 南方振荡 (ENSO) 和印度洋双极 (IOD) 事件相结合驱动的,有时被热带北大西洋变暖 (+TNA) 放大. 监测这些海洋指数可以改善气候预报.

科学领域:

气候科学气候科学
大气科学大气科学
海洋学海洋学海洋学

背景情况:

亚马逊盆地 (AB) 的极端干旱事件受到主要气候模式之间的远程连接的重大影响.
了解这些远程连接对于预测和减轻干旱影响至关重要.

研究的目的:

在亚马逊盆地最近发生的极端干旱事件中调查ENSO,IOD和+TNA相互作用的独特模式.
确定热带模式对干旱严重程度和持续时间的放大作用.

主要方法:

对最近七次极端干旱事件的海面温度和大气变量的季节性复合分析.
检查在马纳乌斯港口最低水位之前的五季度.
识别与循环ENSO阶段相关的独特干旱模式及其与IOD和+TNA的相互作用.

主要成果:

确定了两个主要的干旱模式:周期性的拉尼娜-厄尔尼诺和周期性的厄尔尼诺-拉尼诺事件.
发现ENSO和IOD相联,ENSO触发IOD,IOD通过步行者循环维持ENSO.
ENSO,IOD和+TNA的联合影响放大了罗斯比波并改变了大气循环,导致了AB的严重干旱时期.

结论:

强大的ENSO,IOD和+TNA的合对于在亚马逊盆地启动和维持多年干旱至关重要.
监测这些海洋指数为开发该地区强大的气候预测系统提供了潜力.
这项研究强调了热带气候模式在驱动极端天气事件中的复杂相互作用.

关键词:

亚马逊地区干旱亚马逊地区干旱气候变化的模式.降水量降水量降水量南美南美是南美.热带盆地电信连接热带盆地电信连接

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