海洋再分析资料中IOD-ENSO遥相关的海洋通道机制分析

发布时间：2018-03-27 10:50

本文选题：印度洋偶极子　切入点：ENSO　出处：《海洋学报》2016年12期

【摘要】：本文利用滞后相关分析,研究了海洋再分析资料(SODA、ORAS4和GODAS)中的IOD-ENSO滞后遥相关关系,并与观测资料进行对比。结果显示,3套再分析资料中热带东南印度洋秋季海表温度/海表高度异常和赤道太平洋冷舌次年秋季海表温度/海表高度异常之间显著相关,与观测结果一致。在次表层,观测和再分析资料均显示,热带东南印度洋秋季海表温度异常与赤道太平洋次表层海温异常之间的显著相关关系在冬季至次年秋季沿赤道太平洋垂向剖面向东移动,并于次年夏季和秋季在冷舌区上升至海表。热带东南印度洋和赤道太平洋冷舌滞后1年的相关关系是由海洋通道机制引起的,即IOD事件引起印尼贯穿流流量异常,导致赤道太平洋温跃层异常,激发赤道Kelvin波向东传播,从而影响赤道中-东太平洋冷舌海表温度异常。观测及SODA与ORAS4资料中,热带东南印度洋和赤道太平洋冷舌滞后1年的相关关系在去除ENSO信号后仍然显著,表明海洋通道机制是独立于ENSO事件的;而在GODAS资料中,这些显著相关关系在去除ENSO信号后消失。印尼贯穿流流量异常和Ni錺o3.4及DMI(Dipole Mode Index)指数之间超前-滞后12个月的相关关系显示,在SODA和ORAS4资料中,印尼贯穿流流量同时受到ENSO和IOD的影响,与观测结果一致;而在GODAS中,印尼贯穿流流量异常仅与Ni錺o3.4指数显著相关,极少受到IOD事件的影响,这部分解释了GODAS资料中去除ENSO信号后,IOD-ENSO滞后遥相关关系消失的原因。
[Abstract]:In this paper, the lag teleconnection of IOD-ENSO in marine reanalysis data is studied by means of lag correlation analysis. The results show that there is a significant correlation between the autumn sea surface temperature / sea surface height anomaly in the southeastern tropical Indian Ocean and the autumn sea surface temperature / sea surface height anomaly in the cold tongue of the equatorial Pacific Ocean. In the subsurface layer, both the observational and reanalysis data show that, There is a significant correlation between the autumn SST anomaly in the southeastern tropical Indian Ocean and the subsurface SST anomaly in the equatorial Pacific Ocean, which moves eastward along the vertical section of the equatorial Pacific Ocean from winter to autumn of the following year. The correlation between the cold tongue lag of the southeastern tropical Indian Ocean and the equatorial Pacific Ocean for one year is caused by the oceanic channel mechanism, that is, the IOD event caused the anomalous flow through Indonesia. The anomalous thermocline in the equatorial Pacific Ocean, which excites the propagation of equatorial Kelvin waves eastward, thus affects the surface temperature anomalies of the cold tongue sea in the equatorial mid-eastern Pacific Ocean. Observations and SODA and ORAS4 data show that. The correlation between the cold tongue lag of 1 year in the southeastern tropical Indian Ocean and the equatorial Pacific Ocean is still significant after the removal of ENSO signals, indicating that the oceanic channel mechanism is independent of ENSO events, while in GODAS data, These significant correlations disappeared after the ENSO signal was removed. The correlation between the abnormal through-flow flow in Indonesia and the lead-lag of 12 months between the Nio 3.4 and DMI(Dipole Mode Index indices showed that, in the SODA and ORAS4 data, Indonesian penetrating flow is influenced by both ENSO and IOD at the same time, which is consistent with the observed results, while in GODAS, Indonesian penetrating flow anomaly is only significantly related to NiO3.4 index, and is rarely affected by IOD events. This partly explains the disappearance of IOD-ENSO lag teleconnection after ENSO signal is removed from GODAS data.
【作者单位】：国家海洋局第一海洋研究所海洋环境与数值模拟实验室;青岛海洋科学与技术国家实验室区域海洋动力学与数值模拟功能实验室;中国科学院海洋研究所海洋环流与波动实验室;
【基金】：国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目(U1406404) 全球变化与海气相互作用专项(GASIIPOVAI-03) 中国博士后科学基金(2014M561883) 山东省博士后创新项目专项资金(201403019)
【分类号】：P732

【相似文献】