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Francis, P. A.
- El Nino and the Indian Rainfall in June
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Authors
Affiliations
1 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
2 Indian National Centre for Ocean Information Services, Ministry of Earth Sciences, Hyderabad 500 090, IN
1 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
2 Indian National Centre for Ocean Information Services, Ministry of Earth Sciences, Hyderabad 500 090, IN
Source
Current Science, Vol 110, No 6 (2016), Pagination: 1010-1022Abstract
We have addressed the question of whether the massive deficit of 42% in rainfall over the Indian region in June 2014 can be attributed primarily to the El Nino. We have shown that the variation of convection over the Northern part of the Tropical West Pacific (NWTP: 120-150E, 20-30N) plays a major role in determining the all-India rainfall in June with deficit (excess) in rainfall associated with enhancement (suppression) of convection over NWTP. In June 2014, the outgoing long wave radiation (OLR) anomaly over this region was unfavourable, whereas in June 2015, the OLR anomaly over NWTP was favourable and the all-India rainfall was 16% higher than the long-term average. We find that during El Nino, when the convection over the equatorial central Pacific intensifies, there is a high propensity for intensification of convection over NWTP. Thus, El Niño appears to have an impact on the rainfall over the Indian region via its impact on the convection over the West Pacific, particularly over NWTP. This occurred in June 2014, which suggests that the large deficit in June 2014, could be primarily attributed to the El Niño acting via intensification of convection over NWTP.Full Text
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Abstract Views :295 |
PDF Views:81
Authors
Affiliations
1 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 500 012, IN
2 Indian National Centre for Ocean Information Services, Hyderabad 500 090, IN
1 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 500 012, IN
2 Indian National Centre for Ocean Information Services, Hyderabad 500 090, IN
Source
Current Science, Vol 117, No 11 (2019), Pagination: 1782-1784Abstract
The summer monsoon of 2019 was rather unusual in terms of the all-India rainfall, with 32.8% deficit in June followed by rainfall being 4.6%, 15.4% and 52.3% above average for July, August and September respectively, resulting in the June–September rainfall being 10% above average (http://imdpune.gov.in/), on the borderline of excess rainfall. In an earlier study1, we had analysed the performance of monsoon in June and July, and the important factors determining the interannual variation, viz. the El Niño Southern Oscillation (ENSO) and the Equatorial Indian Ocean Oscillation (EQUINOO).Full Text
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