The El Niño event is a major large-scale air-sea interaction phenomenon over the tropical Pacific region. Previous studies classified El Niño into three types - canonical El Niño, El Niño Modoki I, and El Niño Modoki II. This research reveals that different types of El Niño present dramatic effects on the interannual variability of sea surface salinity over the central equatorial Indian Ocean in the boreal autumn. The decreasing (increasing) sea surface salinity during the canonical El Niño and the EI Niño Modoki I (the EI Niño Modoki II) events is identified. The salinity budget analysis is performed to identify the dominant factors responsible for the variability of sea surface salinity over the central Indian Ocean. The results indicate that the wind-driven anomalous zonal advection plays an important role in sea surface salinity variability during the El Niño events associated with the forcing from the anomalous Walker circulation over the equatorial Indian Ocean.

中文翻译：

---

厄尔尼诺事件对赤道中部印度洋海域盐度的影响。

厄尔尼诺事件是热带太平洋地区上一个重大的大规模海-气相互作用现象。先前的研究将厄尔尼诺现象分为三类-规范的厄尔尼诺现象，厄尔尼诺·莫多基一世和厄尔尼诺·莫多奇二世。这项研究表明，不同类型的厄尔尼诺现象对北半球秋季赤道中部印度洋海面盐度的年际变化具有戏剧性的影响。确定了规范的厄尔尼诺现象和EINiñoModoki I（EINiñoModoki II）事件期间海面盐度的下降（​​增加）。进行盐度预算分析，以确定造成印度中部海域盐度变化的主要因素。