滕宇威,张文君. 2020. ENSO空间形态变异对ENSO-IOD关系年代际减弱的可能作用[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.019
ENSO空间形态变异对ENSO-IOD关系年代际减弱的可能作用
The Possible Role of ENSO Spatial Pattern Variation in The Interdecadal Weakening of ENSO-IOD Relationship
投稿时间:2019-08-27  修订日期:2019-10-23
DOI:10.11676/qxxb2020.019
中文关键词:  ENSO,IOD,年代际变化,两类ENSO
英文关键词:ENSO, IOD, Interdecadal change, Two types of ENSO
基金项目:国家自然科学基金
作者单位E-mail
滕宇威 南京信息工程大学 tywxhz@163.com 
张文君 南京信息工程大学 zhangwj@nuist.edu.cn 
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中文摘要:
      基于1979-2017年哈德来中心的逐月海表温度资料(HadISST)和美国环境预报中心/美国大气资料中心(NCEP/NCAR)提供的大气环流再分析数据,本文研究了北半球秋季厄尔尼诺与南方涛动(ENSO)与印度洋偶极子(IOD)关系的年代际变化特征及其可能原因。结果发现:ENSO-IOD关系存在显著的年?代际变化:2000年代以前,两者呈显著正相关,El Ni?o(La Ni?a)年秋季常对应显著的IOD正(负)异常;但2000年代之后,ENSO-IOD关系显著减弱,在统计上并不显著。进一步研究表明,ENSO空间型态的变异对于该关系的年代际减弱有着重要的作用。在后一时段,中部型厄尔尼诺(CP El Ni?o)事件和东部型拉尼娜(EP La Ni?a)事件频发,CP El Ni?o与IOD强度的关系与其纬向位置密切相关,与其强度的线性关系较弱;而EP La Ni?a,由于海温异常(SSTA)位置偏东,位于赤道东太平洋冷舌区,在偏冷的气候态海温作用下,其引起的大气局地响应很弱,对印度洋的遥强迫作用较弱,因而对IOD强度的影响也偏弱。在两者的共同作用下,ENSO-IOD的关系发生了年代际的减弱。该研究结果对于理解ENSO-IOD关系的复杂性有着重要意义。
英文摘要:
      Based on the monthly sea surface temperature from Hadley Center (HadISST) and the atmospheric reanalysis datasets provided by National Centers for Environmental Prediction / National Center for Atmospheric Research (NCEP/NCAR) from 1979 to 2017, this study investigates the interdecadal variability characteristics of the relationship between El Ni?o Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) in boreal autumn and the possible reasons responsible for it. It is shown that significant interdecadal variations exist in the ENSO-IOD relationship. Before the early 2000s, there was a significant positive correlation between them, El Ni?o (La Ni?a) often corresponds to significant positive (negative) IOD events in autumn. However, after the early 2000s, the ENSO-IOD relationship was significantly weakened and not statistically significant. Further results indicate that the decadal changes of ENSO spatial pattern plays an important role in their relationship decadal change. In the latter stage, central Pacific El Ni?o events (CP El Ni?o) and eastern Pacific La Ni?a events (EP La Ni?a) occurred frequently, the IOD intensity is well correspond to the longitudinal position rather than the intensity of CP El Ni?o. For EP La Ni?a, the sea surface temperature anomaly (SSTA) is located eastward over the cold tongue region of the equatorial Pacific. Under the effect of the cold climatic sea temperature, the local atmospheric response is weak, and teleconnection effect over the Indian Ocean is weak, which results in a weak influence on IOD intensity. Due to the combined effect of the CP El Ni?o and EP La Ni?a, the ENSO-IOD relationship is largely weakened in the latter stage. Our results are important for understanding the complex relationship between ENSO and IOD.
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