| Argo时代东南印度洋上层盐度变化对海平面年代际演变的影响 |
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| 引用本文： | 黄佳妹,庄伟,严晓海,吴泽轮.Argo时代东南印度洋上层盐度变化对海平面年代际演变的影响[J].海洋学报(英文版),2020,39(7):1-2. |
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| 作者姓名： | 黄佳妹 庄伟 严晓海 吴泽轮 |
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| 作者单位： | 厦门大学海洋与地球学院, 近海海洋环境科学国家重点实验室, 厦门, 361102;厦门大学海洋与地球学院, 近海海洋环境科学国家重点实验室, 厦门, 361102;南方海洋科学与工程实验室（广东省珠海）, 珠海, 519082;特拉华大学和厦门大学联合遥感实验中心, 特拉华州, 19716;特拉华大学地球, 海洋与环境学院, 特拉华州, 19716;厦门大学海洋与地球学院, 近海海洋环境科学国家重点实验室, 厦门, 361102;特拉华大学地球, 海洋与环境学院, 特拉华州, 19716 |
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| 基金项目： | The National Key Research and Development Program of China under contract No. 2019YFA0606702; the SOA Global Change and Air-Sea Interaction Project under contract No. GASI-IPOVAI-01-04; the National Natural Science Foundation of China under contract Nos 41776003, 91858202 and 41630963. |
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| 摘 要： | In the past nearly two decades, the Argo Program has created an unprecedented global observing array with continuous in situ salinity observations, providing opportunities to extend our knowledge on the variability and effects of ocean salinity. In this study, we utilize the Argo data during 2004–2017, together with the satellite observations and a newly released version of ECCO ocean reanalysis, to explore the decadal salinity variability in the Southeast Indian Ocean(SEIO) and its impacts on the regional sea level changes. Both the observations and ECCO reanalysis show that during the Argo era, sea level in the SEIO and the tropical western Pacific experienced a rapid rise in 2005–2013 and a subsequent decline in 2013–2017. Such a decadal phase reversal in sea level could be explained, to a large extent, by the steric sea level variability in the upper 300 m. Argo data further show that, in the SEIO, both the temperature and salinity changes have significant positive contributions to the decadal sea level variations. This is different from much of the Indo-Pacific region, where the halosteric component often has minor or negative contributions to the regional sea level pattern on decadal timescale. The salinity budget analyses based on the ECCO reanalysis indicate that the decadal salinity change in the upper 300 m of SEIO is mainly caused by the horizontal ocean advection. More detailed decomposition reveals that in the SEIO, there exists a strong meridional salinity front between the tropical low-salinity and subtropical high salinity waters. The meridional component of decadal circulation changes will induce strong cross-front salinity exchange and thus the significant regional salinity variations.
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| 关 键 词： | 海平面的年代际演变 东南印度洋 盐比容效应 盐度收支 |
| 收稿时间： | 2020/1/1 0:00:00 |
Impacts of the upper-ocean salinity variations on the decadal sea level change in the Southeast Indian Ocean during the Argo era |
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| Huang Jiamei,Zhuang Wei,Yan Xiao-Hai,Wu Zelun.Impacts of the upper-ocean salinity variations on the decadal sea level change in the Southeast Indian Ocean during the Argo era[J].Acta Oceanologica Sinica,2020,39(7):1-2. |
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| Authors: | Huang Jiamei Zhuang Wei Yan Xiao-Hai Wu Zelun |
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| Institution: | 1.State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China2.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China3.Joint Center for Ocean Remote Sensing, University of Delaware-Xiamen University, Newark, DE 19716, USA4.College of Earth, Ocean, and Environment, University of Delaware, Newark, DE 19716, USA |
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| Abstract: | In the past nearly two decades, the Argo Program has created an unprecedented global observing array with continuous in situ salinity observations, providing opportunities to extend our knowledge on the variability and effects of ocean salinity. In this study, we utilize the Argo data during 2004-2017, together with the satellite observations and a newly released version of ECCO ocean reanalysis, to explore the decadal salinity variability in the Southeast Indian Ocean (SEIO) and its impacts on the regional sea level changes. Both the observations and ECCO reanalysis show that during the Argo era, sea level in the SEIO and the tropical western Pacific experienced a rapid rise in 2005-2013 and a subsequent decline in 2013-2017. Such a decadal phase reversal in sea level could be explained, to a large extent, by the steric sea level variability in the upper 300 m. Argo data further show that, in the SEIO, both the temperature and salinity changes have significant positive contributions to the decadal sea level variations. This is different from much of the Indo-Pacific region, where the halosteric component often has minor or negative contributions to the regional sea level pattern on decadal timescale. The salinity budget analyses based on the ECCO reanalysis indicate that the decadal salinity change in the upper 300 m of SEIO is mainly caused by the horizontal ocean advection. More detailed decomposition reveals that in the SEIO, there exists a strong meridional salinity front between the tropical low-salinity and subtropical high salinity waters. The meridional component of decadal circulation changes will induce strong cross-front salinity exchange and thus the significant regional salinity variations. |
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| Keywords: | decadal sea level change southeast Indian Ocean halosteric effect salinity budget |
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