南大西洋双极通过多通道单一频谱分析
Gaston Manta1,2,3, Eviatar Bach4,5,6, Stefanie Talento7
1Geosciences Department and Laboratoire de Météorologie Dynamique (CNRS and IPSL), École Normale Supérieure and PSL University, Paris, France. gastonmanta@gmail.com.
Scientific reports
|July 5, 2024
概括
这项研究揭示了南大西洋海面温度 (SST) 和海平面压力 (SLP) 的两个关键气候振荡,包括与南大西洋双极相似的13年模式,增强对区域气候变化的理解.
科学领域:
- 气候科学 气候科学
- 海洋学 海洋学 海洋学
- 大气科学 大气科学
背景情况:
- 南大西洋表现出复杂的合大气-海洋动态,影响区域和全球气候模式.
- 了解海面温度 (SST) 和海平面压力 (SLP) 的变化对于气候预测和影响评估至关重要.
研究的目的:
- 使用先进的统计方法分析南大西洋SST和SLP的时空变异性.
- 在南大西洋内识别和描述主要的气候振荡和趋势.
- 调查SST和SLP之间的合变异性及其与已知的气候模式的关系.
主要方法:
- 多通道单元频谱分析 (M-SSA) 应用于1959-2022年的ERA5再分析数据.
- 对南大西洋SST和SLP数据进行单独和联合分析,以确定常见的变化模式.
- 以周期,空间结构和与已知的气候现象的关系来描述已识别的振荡.
主要成果:
- 在南大西洋SST和SLP中确定非线性趋势和两个显著的气候振荡.
- 一个占主导地位的13年振荡,呈现西南-东北双极结构,可能与南大西洋双极和太平洋气候模式 (PDO,ENSO) 相关.
- 具有二极结构的二次5年振荡,在空间配置上与十年模式不同,特别是关于开普盆地SST冷舌.
结论:
- 鉴定的趋势和两个振荡模式共同解释了南大西洋SST和SLP总年间变化的近40%.
- 这些发现为南大西洋气候变化的时空演变提供了更深入的见解.
- 这项研究有助于更好地了解南大西洋双极及其潜在的可预测性.
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