The Chennai extreme rainfall event in 2015: The Bay of Bengal connection View Full Text


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Article Info

DATE

2017-06-30

AUTHORS

Alugula Boyaj, Karumuri Ashok, Subimal Ghosh, Anjana Devanand, Govardhan Dandu

ABSTRACT

Southeast India experienced a heavy rainfall during 30 Nov–2 Dec 2015. Particularly, the Chennai city, the fourth major metropolitan city in India with a population of 5 million, experienced extreme flooding and causalities. Using various observed/reanalysed datasets, we find that the concurrent southern Bay of Bengal (BoB) sea surface temperatures (SST) were anomalously warm. Our analysis shows that BoB sea surface temperature anomalies (SSTA) are indeed positively, and significantly, correlated with the northeastern Indian monsoonal rainfall during this season. Our sensitivity experiments carried out with the Weather Research and Forecasting (WRF) model at 25 km resolution suggest that, while the strong concurrent El Niño conditions contributed to about 21.5% of the intensity of the extreme Chennai rainfall through its signals in the local SST mentioned above, the warming trend in BoB SST also contributed equally to the extremity of the event. Further, the El Niño southern oscillation (ENSO) impacts on the intensity of the synoptic events in the BoB during the northeast monsoon are manifested largely through the local SST in the BoB as compared through its signature in the atmospheric circulations over the BoB. More... »

PAGES

2867-2879

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00382-017-3778-7

DOI

http://dx.doi.org/10.1007/s00382-017-3778-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1090309796


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