Intercomparison of tropical Indian Ocean circulation in ocean reanalysis and evaluation in CMIP6 climate models

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Dynamics of Atmospheres and Oceans Pub Date : 2024-03-21 DOI:10.1016/j.dynatmoce.2024.101456
P. Bhanu Deepika , Soumya Mohan , G. Srinivas
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Abstract

In the present study, we assess the Tropical Indian Ocean (TIO) circulation features from the available ocean reanalysis products and the latest version of Coupled Model Intercomparison Project (CMIP6) climate model simulations. We considered the following reanalysis products; Ocean Reanalysis System 5 (ORAS5), Estimating the Circulation and Climate of the Ocean (ECCO), Global Ocean Data Assimilation System (GODAS), Ensemble Coupled Data Assimilation (ECDA), the Bluelink Reanalysis (BRAN) and Simple Ocean Data Assimilation (SODA) and compared them against in-situ observations and the satellite-derived Ocean Surface Current Analyses Real-time (OSCAR). The reanalysis products underestimate the strength and location of the Wyrtki Jets. The BRAN reanalysis performed well compared to the other products in representing the TIO surface zonal currents, followed by ORAS5. The vertical extension of subsurface zonal currents in the equatorial Indian Ocean and their seasonal maxima are well captured in ORAS5. Thus, our analysis suggests that the ORAS5 is a qualitative product to estimate the TIO circulation. We further evaluated the TIO current patterns simulated by CMIP6 models with in-situ data/ ORAS5. The majority of the models show discrepancies in simulating equatorial and south equatorial current systems with a mean bias of 0.1cms−1 and 0.2cms−1, respectively. NorESM2-MM, NorESM2-LM, CanESM5, CESM2-WACCM-FV2, and E3SM-1-ECA models showed a superior skill in reproducing the TIO circulation compared to the rest of the models. Our analysis highlights the importance of assessing various reanalysis products and coupled climate models in representing the circulation of the TIO and, consequently, their role in depicting regional weather and climate.

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海洋再分析中热带印度洋环流的相互比较和 CMIP6 气候模式的评估
在本研究中,我们从现有的海洋再分析产品和最新版本的耦合模式相互比较项目(CMIP6)气候模式模拟中评估了热带印度洋(TIO)环流特征。我们考虑了以下再分析产品:海洋再分析系统 5(ORAS5)、海洋环流和气候估算(ECCO)、全球海洋数据同化系统(GODAS)、集合耦合数据同化(ECDA)、蓝链再分析(BRAN)和简单海洋数据同化(SODA),并将它们与现场观测数据和源自卫星的洋面海流实时分析(OSCAR)进行了比较。再分析产品低估了 Wyrtki 喷射流的强度和位置。与其他产品相比,BRAN 再分析在表现 TIO 表面带流方面表现良好,其次是 ORAS5。ORAS5 很好地捕捉了赤道印度洋次表层带状洋流的垂直延伸及其季节性最大值。因此,我们的分析表明,ORAS5 是估算 TIO 环流的定性产品。我们进一步评估了 CMIP6 模式模拟的 TIO 海流模式和 ORAS5 原位数据。大多数模式在模拟赤道和南赤道海流系统方面存在差异,平均偏差分别为 0.1cms-1 和 0.2cms-1。与其他模式相比,NorESM2-MM、NorESM2-LM、CanESM5、CESM2-WACCM-FV2 和 E3SM-1-ECA 模式在再现 TIO 环流方面表现得更为出色。我们的分析强调了评估各种再分析产品和耦合气候模式在表现 TIO 环流方面的重要性,以及它们在描述区域天气和气候方面的作用。
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来源期刊
Dynamics of Atmospheres and Oceans
Dynamics of Atmospheres and Oceans 地学-地球化学与地球物理
CiteScore
3.10
自引率
5.90%
发文量
43
审稿时长
>12 weeks
期刊介绍: Dynamics of Atmospheres and Oceans is an international journal for research related to the dynamical and physical processes governing atmospheres, oceans and climate. Authors are invited to submit articles, short contributions or scholarly reviews in the following areas: •Dynamic meteorology •Physical oceanography •Geophysical fluid dynamics •Climate variability and climate change •Atmosphere-ocean-biosphere-cryosphere interactions •Prediction and predictability •Scale interactions Papers of theoretical, computational, experimental and observational investigations are invited, particularly those that explore the fundamental nature - or bring together the interdisciplinary and multidisciplinary aspects - of dynamical and physical processes at all scales. Papers that explore air-sea interactions and the coupling between atmospheres, oceans, and other components of the climate system are particularly welcome.
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