Uncertainties of ENSO-related Regional Hadley Circulation Anomalies within Eight Reanalysis Datasets
Uncertainties of ENSO-related Regional Hadley Circulation Anomalies within Eight Reanalysis Datasets
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DOI：
10.1007/s00376-023-3047-0
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发表时间：
2023-06
影响因子：
5.8
通讯作者：
Yadi Li;Xichen Li;Juan Feng;Yi Zhou;Wenzhu Wang;Yurong Hou
中科院分区：
文献类型：
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作者：
Yadi Li;Xichen Li;Juan Feng;Yi Zhou;Wenzhu Wang;Yurong Hou
厄尔尼诺-南方涛动（ENSO）是全球年际变化的主导模态，它在加强Hadley环流（HC）的同时，也限制其纬向扩展，导致急流系统向赤道方向移动。以往的研究已经调查了HC的响应ENSO事件使用不同的再分析数据集，并评估其捕获ENSO相关的HC异常的主要特征的能力。然而，这些研究主要集中在全球HC，由纬向平均质量流函数（MSF）表示。相对较少的研究，从区域的角度来评估HC的反应，部分原因是斯托克斯MSF的先决条件，这使我们无法整合一个区域HC。在这项研究中，我们采用了最近开发的技术来构建的三维结构的HC和评估能力的8个国家的最先进的再分析再现区域HC响应ENSO事件。结果表明，所有八次再分析都很好地再现了HC响应的空间结构，其中中东太平洋HC增强，而印太暖池和热带大西洋环流减弱。不同数据集之间的三维HC异常的空间相关系数总是大于0.93。然而，这些数据集可能无法很好地捕获HC响应的幅度。这种不确定性是特别大的ENSO相关的赤道非对称HC异常，在气候预报系统再分析（CFSR）的最大振幅约为20世纪世纪再分析（20 CR）的最小值的2.7倍。在使用再分析资料评估ENSO相关HC异常强度时应谨慎。
El Niño–Southern Oscillation (ENSO), the leading mode of global interannual variability, usually intensifies the Hadley Circulation (HC), and meanwhile constrains its meridional extension, leading to an equatorward movement of the jet system. Previous studies have investigated the response of HC to ENSO events using different reanalysis datasets and evaluated their capability in capturing the main features of ENSO-associated HC anomalies. However, these studies mainly focused on the global HC, represented by a zonal-mean mass stream function (MSF). Comparatively fewer studies have evaluated HC responses from a regional perspective, partly due to the prerequisite of the Stokes MSF, which prevents us from integrating a regional HC. In this study, we adopt a recently developed technique to construct the three-dimensional structure of HC and evaluate the capability of eight state-of-the-art reanalyses in reproducing the regional HC response to ENSO events. Results show that all eight reanalyses reproduce the spatial structure of HC responses well, with an intensified HC around the central-eastern Pacific but weakened circulations around the Indo-Pacific warm pool and tropical Atlantic. The spatial correlation coefficient of the three-dimensional HC anomalies among the different datasets is always larger than 0.93. However, these datasets may not capture the amplitudes of the HC responses well. This uncertainty is especially large for ENSO-associated equatorially asymmetric HC anomalies, with the maximum amplitude in Climate Forecast System Reanalysis (CFSR) being about 2.7 times the minimum value in the Twentieth Century Reanalysis (20CR). One should be careful when using reanalysis data to evaluate the intensity of ENSO-associated HC anomalies.