| Huang Jiamei,Zhuang Wei,Yan Xiao-Hai,Wu Zelun. 2020. Impacts of the upper-ocean salinity variations on the decadal sea level change in the Southeast Indian Ocean during the Argo era. Acta Oceanologica Sinica, 39(7):1－10 |
| Impacts of the upper-ocean salinity variations on the decadal sea level change in the Southeast Indian Ocean during the Argo era |
| 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 |
| Received:January 01, 2020 |
| DOI：10.1007/s13131-020-1574-4 |
| Key words:decadal sea level change southeast Indian Ocean halosteric effect salinity budget |
| 中文关键词: 海平面的年代际演变 东南印度洋 盐比容效应 盐度收支 |
| 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. |
| Author Name | Affiliation | E-mail | | Huang Jiamei | State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | | | Zhuang Wei | State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China | wzhuang@xmu.edu.cn | | Yan Xiao-Hai | Joint Center for Ocean Remote Sensing, University of Delaware-Xiamen University, Newark, DE 19716, USA
College of Earth, Ocean, and Environment, University of Delaware, Newark, DE 19716, USA | | | Wu Zelun | State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
College of Earth, Ocean, and Environment, University of Delaware, Newark, DE 19716, USA | |
|
| Hits: 1362 |
| Download times: 980 |
| 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. |
| 中文摘要: |
| 在过去近20年里，Argo计划创建了一个前所未有的全球观测网，从而实现了对主要大洋现场盐度的连续观测，为进一步认识海洋的盐度变化特征及其影响提供了数据支持。本研究采用2004-2017年的Argo数据，结合卫星观测数据和最新发布的ECCO海洋再分析产品，分析了东南印度洋盐度的年代际变化及其对局地海平面变化的影响。观测和ECCO再分析结果均显示：在Argo计划期间，东南印度洋和热带西太平洋海平面在2005-2013年期间快速升高，随后在2013-2017期间出现下降。海平面的这种年代际反转特征在很大程度上反映了上层300米的比容海面高度变化。Argo数据的结果进一步表明：在东南印度洋海域，温度和盐度变化都对海平面的年代际演变具有显著的正贡献。这一特点明显有别于印-太海域的其它多数区域：在这些区域，盐比容分量往往对局地的年代际海平面变化影响很小或者起了负贡献。基于ECCO再分析数据的盐度收支分析结果表明：东南印度洋上层300米盐度的年代际变化主要是由海洋的水平平流效应所导致。进一步的分解结果显示，在东南印度洋热带低盐水和副热带高盐水之间，存在一个很强的经向盐度锋面，使大尺度环流年代际变化的经向分量在此处产生显著跨锋面盐度交换，从而导致了局地盐度的显著变化。 |
|
HTML
View Full Text
View/Add Comment Download reader |
| Close |
|
|
|
