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Decadal variability and trends of oceanic barrier layers in tropical Pacific

机译:热带太平洋海洋屏障层的年代际变化和趋势

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摘要

Decadal variability and trends of the isothermal layer depth (ILD), mixed layer depth (MLD), and barrier layer thickness (BLT) were analyzed for the tropical Pacific during 1979-2015. The decadal variability of ILD, MLD, and BLT shows a close connection with the Pacific Decadal Oscillation (PDO). At PDO positive phase, the eastward shift of precipitation and weakened trade winds result in thinner BLT in western Pacific and thicker BLT in central and eastern Pacific. The situation is reversed at PDO negative phase. The differences in BLT can be up to 9-15 m. The spatial distributions of decadal trends of ILD and MLD are complex, but a thickening of BLT in the western tropical Pacific is clearly present. The raw trends of ILD, MLD, and BLT averaged in the tropical Pacific (30A degrees N-30A degrees S, 120A degrees E-75A degrees W) from 1979 to 2015 are 1.62, 1.20, and 0.51 m per decade, respectively. PDO can explain about 25% of the increasing trends of BLT, while El Nio-Southern Oscillation (ENSO) only explains about 1.7%. Global warming and/or variability at longer time scales is responsible for the remaining increasing trends. The BLT change is related to the warming and freshening of the western Pacific warm pool in recent decades. The ocean-atmosphere interactions about trade winds, wind-driven ocean circulation, temperature, and precipitation/evaporation are discussed.
机译:分析了1979-2015年热带太平洋等温层深度(ILD),混合层深度(MLD)和阻挡层厚度(BLT)的年代际变化和趋势。 ILD,MLD和BLT的年代际变化显示与太平洋年代际振荡(PDO)密切相关。在PDO正阶段,降水的东移和贸易风减弱导致西太平洋的BLT变薄,中太平洋和东太平洋的BLT变厚。在PDO负相时情况相反。 BLT的差异最大为9-15 m。 ILD和MLD年代际趋势的空间分布是复杂的,但在热带西太平洋显然存在着BLT的增厚。从1979年到2015年,热带太平洋地区(北纬30A度,南纬30A度,西经120A度至E-75A度)ILD,MLD和BLT的原始趋势平均值分别为每十年1.62、1.20和0.51 m。 PDO可以解释约25%的BLT增长趋势,而厄尔尼诺-南方涛动(ENSO)只能解释约1.7%。其余时间的增长趋势是较长时间尺度上的全球变暖和/或变化造成的。 BLT的变化与近几十年来西太平洋暖池的变暖和新鲜有关。讨论了关于商风,风力驱动的海洋环流,温度和降水/蒸发的海洋-大气相互作用。

著录项

  • 来源
    《Ocean Dynamics》 |2018年第9期|1155-1168|共14页
  • 作者

    Wang Lingxia; Xu Fanghua;

  • 作者单位

    Tsinghua Univ, Dept Earth Syst Sci, Minist Educ, Key Lab Earth Syst Modeling, Beijing 100084, Peoples R China;

    Tsinghua Univ, Dept Earth Syst Sci, Minist Educ, Key Lab Earth Syst Modeling, Beijing 100084, Peoples R China;

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

    Barrier layers; Tropical Pacific; Decadal variability and trends; PDO;

    机译:屏障层;热带太平洋;年代际变化和趋势;PDO;

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