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The Extreme Positive Indian Ocean Dipole of 2019 and Associated Indian Summer Monsoon Rainfall Response
Geophysical Research Letters ( IF 5.2 ) Pub Date : 2020-12-22 , DOI: 10.1029/2020gl091497
Satyaban B. Ratna 1 , Annalisa Cherchi 2, 3 , Timothy J. Osborn 1 , Manoj Joshi 1 , Umakanth Uppara 1
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The positive Indian Ocean Dipole (IOD) event in 2019 was among the strongest on record, while the Indian Summer monsoon (ISM) was anomalously dry in June then very wet by September. We investigated the relationships between the IOD, Pacific sea surface temperature (SST), and ISM rainfall during 2019 with an atmospheric general circulation model forced by observed SST anomalies. The results show that the extremely positive IOD was conducive to a wetter‐than‐normal ISM, especially late in the season when the IOD strengthened and was associated with anomalous low‐level divergence over the eastern equatorial Indian Ocean and convergence over India. However, a warm SST anomaly in the central equatorial Pacific contributed to low‐level divergence and decreased rainfall over India in June. These results help to better understand the influence of the tropical SST anomalies on the seasonal evolution of ISM rainfall during extreme IOD events.

中文翻译:

2019年印度洋偶极子极正值和相关的印度夏季风季风降雨响应

2019年印度洋偶极子(IOD)阳性事件是有记录以来最强的事件,而印度夏季风(ISM)在6月异常干燥,然后在9月非常潮湿。我们使用观测到的SST异常强迫的大气总体环流模型调查了2019年IOD,太平洋海表温度(SST)和ISM降水之间的关系。结果表明,极高的IOD有助于ISM较正常湿润,特别是在IOD加强的季节后期,并且与赤道东部印度洋上异常的低空散度以及印度上空的汇聚有关。但是,赤道中太平洋太平洋海表温度异常,导致6月印度低空发散和降雨减少。
更新日期:2021-01-25
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