期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 12, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL092873
关键词
Indian summer monsoon rainfall; ENSO; Indian Ocean basin-wide SST anomaly; recovery
资金
- National Key R&D program of China [2017YFA0603801]
- Natural Science Foundation of China [41975089, 41476003]
The study revealed that the relationship between ISMR and ENSO has strengthened since 2001, with TIO SST anomaly playing a key role. Different signs of the TIO anomaly under the same ENSO scenario lead to distinct atmospheric circulation anomalies over the Indian Ocean, affecting the ISMR-ENSO relationship and bringing potential for improving ISMR prediction.
This study found that the relationship between the Indian Summer Monsoon Rainfall (ISMR) and El Nino-Southern Oscillation (ENSO) has recovered since 2001, and the relationship strength is closely related to the summer tropical Indian Ocean (TIO) sea surface temperature (SST) anomaly, with the TIO warming (cooling) indicating a stronger (weaker) relationship. Under the same El Nino/La Nina scenario, different signs of the TIO anomaly indicate distinct atmospheric circulation anomalies over the Indian Ocean, thus affecting the ISMR-ENSO relationship. The TIO anomaly is principally associated with different types of ENSO temporal evolution. Strong El Nino events with an early onset, and the transition of El Nino to La Nina, tend to have a warmer TIO and a stronger ISMR-ENSO relationship, in contrast to most of the cases of a decaying La Nina or a La Nina that persists throughout the year. The result brings a prospect for improving the ISMR prediction.
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