Wind-forced equatorial wave dynamics of the Pacific Ocean during 2014/2015 and 2015/2016 El Nino events
Wind-forced equatorial wave dynamics of the Pacific Ocean during 2014/2015 and 2015/2016 El Nino events
复制标题
2014/2015和2015/2016厄尔尼诺事件期间太平洋风力赤道波动力学
DOI：
10.1007/s00343-020-9329-9
复制
发表时间：
2020
影响因子：
1.6
通讯作者：
Zhao Xia
中科院分区：
文献类型：
--
作者：
Wang Jing;Yuan Dongliang;Xu Tengfei;Zhao Xia
利用大气科学和地球物理流体动力学数值模拟实验室，比较了2014/2015和2015/2016年厄尔尼诺事件之间年际海平面变化的赤道波动动力学，大气物理研究所气候海洋模式（LICOM），由国家环境预报中心（NCEP）再分析I风应力和热通量在2000年-2015.此外，与Hadley中心和高度计资料相比，LICOM能较好地再现太平洋赤道地区沿着海表温度距平（SSTA）和海平面距平（SLA）的年际变化。我们提取了LICOM模拟的赤道波系数，通过乘以赤道波结构来得到对SLA的贡献。在2014/2015年厄尔尼诺事件期间，2014年4月从西边界上升的赤道Kelvin波到达东太平洋，削弱了东太平洋的SLA。然而，在2015/2016年厄尔尼诺事件期间，没有来自太平洋西部边界的上升赤道开尔文波可以到达东部边界。线性波模型结果还表明，2014/2015和2015/2016年从西边界上升的赤道Kelvin波可以到达东边界。然而，2015年较强的西风异常迫使下降的赤道开尔文波的贡献超过了西边界上升的赤道开尔文波的贡献。因此，西边界反射和弱西风爆发抑制了2014/2015年厄尔尼诺事件的增长。所揭示的赤道波动动力学特征对今后ENSO事件的模拟和预报具有重要意义。
The equatorial wave dynamics of interannual sea level variations between 2014/2015 and 2015/2016 El Niño events are compared using the Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics Climate Ocean Model (LICOM) forced by the National Centers for Environmental Prediction (NCEP) reanalysis I wind stress and heat flux during 2000–2015. In addition, the LICOM can reproduce the interannual variability of sea surface temperature anomalies (SSTA) and sea level anomalies (SLA) along the equator over the Pacific Ocean in comparison with the Hadley center and altimetric data well. We extracted the equatorial wave coefficients of LICOM simulation to get the contribution to SLA by multiplying the meridional wave structure. During 2014/2015 El Niño event, upwelling equatorial Kelvin waves from the western boundary in April 2014 reach the eastern Pacific Ocean, which weakened SLA in the eastern Pacific Ocean. However, no upwelling equatorial Kelvin waves from the western boundary of the Pacific Ocean could reach the eastern boundary during the 2015/2016 El Niño event. Linear wave model results also demonstrate that upwelling equatorial Kelvin waves in both 2014/2015 and 2015/2016 from the western boundary can reach the eastern boundary. However, the contribution from stronger westerly anomalies forced downwelling equatorial Kelvin waves overwhelmed that from the upwelling equatorial Kelvin waves from the western boundary in 2015. Therefore, the western boundary reflection and weak westerly wind burst inhibited the growth of the 2014/2015 El Niño event. The disclosed equatorial wave dynamics are important to the simulation and prediction of ENSO events in future studies.