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Interannually varying salinity effects on ENSO in the tropical pacific: a diagnostic analysis from Argo

机译：盐度对热带太平洋ENSO的年际变化：来自Argo的诊断分析

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摘要

In this paper, three-dimensional temperature and salinity fields from Argo profiles are used to diagnose the interannual variations of some related upper oceanic fields in the tropical Pacific, with a focus on interannually varying salinity effects on the El Nio-Southern Oscillation (ENSO) events. It is clearly demonstrated that the salinity field plays a significantly large role in modulating the density and mixed layer (ML) over the western-central tropical Pacific. In particular, the contribution of interannually varying salinity to the interannual variations in density, ML, and stratification is surprisingly larger than that of interannually varying temperature. Over the entire region west of the dateline, the salinity effects are not limited to the surface but are clearly seen below the ML as represented in density and stratification fields. Furthermore, the mechanism for how the anomalous salinity field is modulating the ENSO cycle is investigated and explained through the El Nio (2009-2010) and La Nia (2010-2011) cases. Evidently, salinity field is shown to exert a significant influence on interannual variability as it directly affects the vertical mixing and entrainment at the base of the ML, the processes important to sea surface temperature (SST) in the equatorial regions.
机译：本文利用Argo剖面的三维温度和盐度场来诊断热带太平洋一些相关的上层海洋场的年际变化，重点是盐度对厄尔尼诺-南方涛动（ENSO）的年际变化。事件。清楚地表明，盐度场在调节中西部热带太平洋上空的密度和混合层（ML）方面起着重要作用。特别是，盐度年际变化对密度，ML和分层的年际变化的贡献要比年际变化的温度大。在日期线以西的整个区域中，盐度影响不仅限于表面，而且在密度线和分层字段中可以清楚地看到在最低线以下。此外，通过El Nio（2009-2010）和La Nia（2010-2011）案例研究并解释了异常盐度场如何调节ENSO周期的机制。显然，盐度场显示出对年际变化的重要影响，因为它直接影响着海平面底部的垂直混合和夹带作用，而这一过程对赤道地区的海面温度（SST）很重要。

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  • 来源
    《Ocean Dynamics》 |2015年第5期|691-705|共15页
  • 作者

    Zheng Fei; Zhang Rong-Hua;

  • 作者单位

    Chinese Acad Sci, Inst Atmospher Phys, Int Ctr Climate & Environm Sci, Beijing 100029, Peoples R China;

    Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Salinity effect; ENSO; Argo; Western-central tropical Pacific;

    机译：盐度效应;ENSO;Argo;中西部热带太平洋;

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