海洋再分析资料中IOD-ENSO遥相关的海洋通道机制分析

徐腾飞; 周慧

doi:10.3969/j.issn.0253-4193.2016.12.003

海洋再分析资料中IOD-ENSO遥相关的海洋通道机制分析

doi: 10.3969/j.issn.0253-4193.2016.12.003

徐腾飞¹,
周慧²

1.
国家海洋局第一海洋研究所海洋环境与数值模拟实验室, 山东青岛 266061;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, 山东青岛 266061
2.
中国科学院海洋研究所海洋环流与波动实验室, 山东青岛 266071

基金项目: 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（GASI-IPOVAI-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）。

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出版历程
- 收稿日期: 2016-03-20

Oceanic channel dynamics of the IOD-ENSO teleconnection in oceanic reanalysis datasets

Xu Tengfei¹,
Zhou Hui²

1.
Laboratory of Marine Environment and Numerical Simulation, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
2.
Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

摘要

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Niño3.4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Niño3.4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。
- 印度洋偶极子 /
- ENSO /
- 滞后遥相关 /
- 海洋通道 /
- 印尼贯穿流
Abstract: IOD-ENSO lag teleconnection in oceanic reanalysis datasets (SODA, ORAS4, and NCEP GODAS) are analyzed and compared with those in observations based on lag correlation analysis. The results show significant lag correlations between the sea surface temperature anomalies (SSTA)/sea surface height anomalies (SSHA) in the southeastern tropical Indian Ocean (STIO) in fall and those in the equatorial Pacific cold tongue in the following fall in the three datasets, which are in agreement with observations. In the subsurface, lag correlations between the STIO SSTA in fall and the temperature anomalies in the equatorial Pacific vertical section show that the significant positive correlations moved eastward in the following winter through fall and outcropped at the cold tongue in the following summer and fall in both observation and assimilation datasets. The significant lag correlations between the STIO and the Pacific cold tongue are attribute to the oceanic channel dynamics, i.e., the IOD induced Indonesian Throughflow transport anomalies results in thermocline anomalies in the equatorial Pacific, driving equatorial Kelvin waves to propagate eastward, thereby contributing to the SSTA in the central-eastern Pacific cold tongue. These significant lag correlations are robust even if the ENSO signal is removed in the SODA and ORAS4 datasets, which are in agreement with those in the observations, suggesting that the oceanic channel dynamics are independent of ENSO. In comparison, the significant lag correlations have disappeared if the ENSO signal is regressed out in the GODAS dataset. Lag correlations between the Indonesian Throughflow (ITF) volume transport anomalies and the Niño 3.4/DMI indices with lag time from -12 to 12 months suggest significant influences of both ENSO and IOD events on the ITF transport in the SODA and ORAS4 datasets, consistent with the analyses of observations. The ITF transport anomalies, however, shows significant correlation only with Niño 3.4 indices in the GODAS dataset, suggesting that the ITF transport is poorly dominated by the IOD anomalies in the GODAS. This explains why the lag correlation of IOD-ENSO teleconnection disappears at one year time lag if ENSO signal was removed in the GODAS dataset.
- Indian Ocean Dipole /
- ENSO /
- teleconnection /
- oceanic channel /
- Indonesian Throughflow

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