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Changes in ENSO-monsoon relations from early to recent decades during onset, peak and withdrawal phases of Indian summer monsoon
Climate Dynamics ( IF 3.8 ) Pub Date : 2020-06-27 , DOI: 10.1007/s00382-020-05335-x
P. H. Hrudya , Hamza Varikoden , R. Vishnu , J. Kuttippurath

The El Niño Southern Oscillation (ENSO) is an important coupled ocean–atmosphere phenomenon in the tropical Pacific and an important modulator of the spatio-temporal variability of Indian summer monsoon rainfall (ISMR). Here, we explore the impact of ENSO during onset (June), peak (July–August) and withdrawal (September) phases of ISMR for the period 1951–2015, by studying the changes in the ENSO-monsoon relationship from early decades (1951–1980) to recent decades (1986–2015). We observe noticeable changes in the ENSO-monsoon relationship from the early to recent decades during all the three phases. During El Niño events, rainfall over most of the Indian regions is significantly increased in recent decades during onset phase, but a significant decrease in rainfall is observed during peak and withdrawal phases. On the other hand, the rainfall during La Niña events is significantly decreased over the monsoon core zone of India during all the three phases. A significant increase (decrease) in sea surface temperature (SST) is observed over the central equatorial Pacific and Indian Ocean during El Niño (La Niña) events in recent decades. These changes differ from one phase to another and related to the observed rainfall patterns over the Indian region. Apart from these, the changes in the anomalies of low level circulation and Walker circulation over the Indo-Pacific domain are also linked to the changes in rainfall during the ENSO events, with most significant relationship during the onset phase.



中文翻译:

在印度夏季风的发病,高峰和退缩阶段,ENSO-季风关系从早期到最近几十年的变化

厄尔尼诺南方涛动(ENSO)是热带太平洋中重要的海-气耦合现象,也是印度夏季季风降水(ISMR)时空变化的重要调节因素。在这里,我们通过研究1950年代初期(1951年)以来ENSO与季风关系的变化,探讨了ENSO在1951-2015年期间ISMR发病(6月),高峰(7月至8月)和撤离(9月)阶段的影响。 –1980年)到最近几十年(1986–2015年)。从这三个阶段的早期到最近几十年,我们观察到ENSO与季风关系的显着变化。在厄尔尼诺事件期间,近几十年来,印度大部分地区的降雨在发病期显着增加,但在高峰期和撤离期观测到降雨显着减少。另一方面,在这三个阶段中,印度季风核心区的拉尼娜事件期间的降雨量都明显减少。近几十年来,在厄尔尼诺(LaNiña)事件期间,赤道中部太平洋和印度洋的海表温度(SST)显着增加(降低)。这些变化在一个阶段到另一个阶段都不同,并且与印度地区的观测降雨模式有关。除此之外,ENSO事件期间印度洋-太平洋地区低空环流和Walker环流异常的变化也与降雨的变化有关,在开始阶段关系最为密切。近几十年来,在厄尔尼诺(LaNiña)事件期间,赤道中部太平洋和印度洋的海表温度(SST)显着增加(降低)。这些变化在一个阶段到另一个阶段都不同,并且与印度地区的观测降雨模式有关。除此之外,印度洋-太平洋地区低空环流和沃克环流异常的变化也与ENSO事件期间的降雨变化有关,在发病期之间的关系最为明显。近几十年来,在厄尔尼诺(LaNiña)事件期间,赤道中部太平洋和印度洋的海表温度(SST)显着增加(降低)。这些变化在一个阶段到另一个阶段都不同,并且与印度地区的观测降雨模式有关。除此之外,印度洋-太平洋地区低空环流和沃克环流异常的变化也与ENSO事件期间的降雨变化有关,在发病期之间的关系最为明显。

更新日期:2020-07-21
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