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Pacific mean-state control of atlantic multidecadal oscillation-el nifio relationship

机译：太平洋卑鄙的大西洋多迪卡尔振荡 - EL Nifio关系控制

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摘要

We investigate the potential impacts of the interdecadal Pacific oscillation (IPO) and Atlantic multidecadal oscillation (AMO) on El Nino and the associated atmosphere and ocean dynamics by using the Community Earth System Model-Large Ensemble Simulation (CESM-LENS). The individual effects of IPO and AMO on El Nino frequency and the underlying atmosphere-ocean processes are well reproduced in CESM-LENS and agree with previous studies. However, the sensitivity of El Nino frequency to the AMO is robust mainly during the negative IPO phase and very weak during the positive IPO phase. Further analysis suggests that the atmospheric mean state in the Pacific is much amplified during the negative IPO phase, facilitating the AMO-induced interocean atmospheric teleconnections. More specifically, during the negative IPO phase of the amplified mean state, the positive AMO enhances ascending motion from the northeastern Pacific, which in turn increases subsidence into the southeast Pacific through local anomalous Hadley circulation. The associated low-level easterly wind anomalies in the central equatorial Pacific are also reinforced by amplified upper-level divergence over the Maritime Continent to enhance the negative IPO, which is unfavorable for El Nino occurrence. Conversely, the negative AMO nearly cancels out the suppressing effect of the negative IPO on El Nino occurrence. During the positive IPO phase of the weakened atmospheric mean state, however, the AMO-induced interocean atmospheric teleconnections are much weaker; thus, neither the positive nor the negative AMO has any significant impact on El Nino occurrence.
机译：我们通过使用社区地球系统模型 - 大集合仿真（CESM镜头）来调查跨跨越太平洋振荡（IPO）和大型多型振荡振荡（AMO）对El Nino和相关氛围和海洋动力学的潜在影响。 IPO和AMO对EL NINO频率和潜在的大气海洋过程的个性效果在CESM镜头中再现，并同意以前的研究。然而，EL NINO频率与AMO的敏感性主要是在负IPO相期间和阳性IPO相期间非常弱。进一步的分析表明，太平洋的大气平均状态在负IPO阶段期间很大扩增，促进了amo诱导的跨界大气遥控器。更具体地，在扩增平均状态的负IPO阶段期间，积极的amo增强了来自东北太平洋的升序动议，这反过来通过局部异常Hadley循环增加了东南太平洋。中央赤道太平洋的相关低级东风异常也通过放大海洋大陆的上层分歧来增强负面研究官，这对EL NINO发生不利。相反，消极的AMO几乎取消了负IPO对EL NINO发生的抑制作用。然而，在弱化大气平均状态的积极IPO阶段，AMO诱导的跨界大气遥控较弱;因此，正面也没有对EL NINO发生的任何显着影响。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2115-2116|共2页
  • 作者

    K.I.M. Dongmin; S.- K. Lee; H. Lopez; M. Goes;

  • 作者单位

    Cooperative Institute for Marine and Atmospheric Studies University of Miami NOAA/Atlantic Oceanographic and Meteorological Laboratory Miami FL United States;

    Cooperative Institute for Marine and Atmospheric Studies University of Miami NOAA/Atlantic Oceanographic and Meteorological Laboratory Miami FL United States;

    Cooperative Institute for Marine and Atmospheric Studies University of Miami NOAA/Atlantic Oceanographic and Meteorological Laboratory Miami FL United States;

    Cooperative Institute for Marine and Atmospheric Studies University of Miami NOAA/Atlantic Oceanographic and Meteorological Laboratory Miami FL United States;

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