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El Nino and the Indian Rainfall in June


Affiliations
1 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, India
2 Indian National Centre for Ocean Information Services, Ministry of Earth Sciences, Hyderabad 500 090, India
 

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.
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  • Sikka, D. R., Some aspects of the large scale fluctuations of summer monsoon rainfall over India in relation to fluctuations in the planetary and regional scale circulation parameters. Proc. Indian Acad. Sci. (Earth Planet. Sci.), 1980, 89, 179–195.

  • Pant, G. B. and Parthasarathy, B., Some aspects of an association between the southern oscillation and Indian summer monsoon.Arch. Meteorol. Geophys. Bioklimatol., 1981, 1329, 245–252.

  • Rasmusson, E. M. and Carpenter, T. H., The relationship between eastern equatorial Pacific sea surface temperature and rainfall over India and Sri Lanka. Mon. Weather Rev., 1983, 111, 517–528.

  • Rasmussen, E. M. and Carpenter, T. H., Variations in tropical sea surface temperature and surface wind fields associated with the Southern Oscillation/El Niño. Mon. Weather Rev., 1982, 110, 354–384.

  • Philander, S. G. H., El Niño, La Niña and the Southern Oscillation, Academic Press, New York, 1990, p. 293.

  • Sarachik, S. Edward and Cane. Mark The El Niño and southern oscillation phenomenon, 2010, Cambridge University Press, Cambridge, UK, p. 384.

  • ENSO: Recent Evolution, Current Status and Predictions, update prepared by Climate Prediction Center/NCEP 19 May 2014.

  • Long Range Forecast Update for 2014 Southwest Monsoon Rainfall, 9 June 2014, Earth System Science Organization (ESSO), Ministry of Earth Sciences (MoES), India Meteorological Department.

  • ENSO: Recent Evolution, Current Status and Predictions, update prepared by Climate Prediction Center/NCEP 26 May 2015.

  • Long Range Forecast Update for 2015 Southwest Monsoon Rainfall, 2 June 2015, Earth System Science Organization (ESSO), Ministry of Earth Sciences (MoES), India Meteorological Department.

  • Francis, P. A. and Gadgil, Sulochana, The aberrant behaviour of the Indian monsoon in June 2009. Curr. Sci., 2009, 97(9), 1291– 1295.

  • Francis, P. A. and Sulochana Gadgil, Towards understanding the unusual Indian monsoon in 2009. J. Earth Syst. Sci., 2010, 119(4), 397–415.

  • Gadgil, Sulochana, Vinayachandran, P. N. and Francis, P. A., Droughts of the Indian summer monsoon: Role of clouds over the Indian Ocean. Curr. Sci., 2003, 85, 1713–1719.

  • Gadgil, Sulochana, Vinaychandran, P. N., Francis, P. A. and Gadgil, Siddhartha, Extremes of Indian summer monsoon rainfall, ENSO, equatorial Indian Ocean Oscillation. Geophys. Res. Lett., 2004, 31; doi: 10.1029/2004GL019733.

  • Sajani Surendran, Sulochana Gadgil, Francis P. A. and Rajeevan M., Prediction of Indian rainfall during the summer monsoon season on the basis of links with equatorial Pacific and Indian Ocean climate indices. Environ. Res. Lett., 2015, 10, 094004.

  • Krishnan, R. and Sugi, M., Baiu rainfall variability and its monsoon teleconnections, J. Met. Soc., 2001, 79, 851–860.

  • Kripalani, R. H. and Ashwini Kulkarni, Monsoon rainfall variations and teleconnections with rainfall variation over south and east Asia. Int. J. Climatol., 2001, 21, 603–616.

  • Gadgil, Sulochana, The Indian Monsoon and its variability. Annu.Rev. Earth. Planet. Sci., 2003, 31, 429–467.

  • Ding, Y. and Sikka, D. R., Synoptic Systems and Weather in the Asian Monsoon (ed. Wang, B.), Praxis, Chichester, UK, 2005, pp.131–202.

  • Krishnamurti, T. N. and Ardanuy, P., The 10 to 20 day westward propagating mode and breaks in the monsoon. Tellus, 1980, 32, 15–26.

  • Rao, Y. P., Southwest Monsoon, Meteorological Monograph, Synoptic Meteorology No. 1/1976, India Meteorological Department, 1976.

  • Joseph, P. V., Onset, advance and withdrawal of monsoon, Monsoon Monograph Vol. 1 (eds Tyagi, A., Asnani, G. C., De, U. S., Hatwar, H. R. and Mazumdar, A. B.), India Meteorological Department, 2012.

  • Khole, M., Meteorological conditions associated with very sluggish advance of Indian summer monsoon in 2002. Mausam, 2009, 60, 51–60.

  • Bansod, S. D., Singh, S. V. and Kripalani, R. H., The relationship of monsoon onset with subsequent rainfall over India. Int. J. Climatol., 1991, 11(7), 809–817.

  • Liebmann, B. and Smith, C. A., Description of a complete outgoing longwave radiation dataset. Bull. Am. Meteorol. Soc., 1996, 77, 1275–1277.

  • Kalnay, E. et al., The NCEP/NCAR 40-year reanalysis project.Bull. Am. Meteorol. Soc., 1996, 2, 437–471.

  • Pattanaik, D. R. and Rajeevan, M., North-west Pacific tropical cyclone activity and July rainfall over India. Meteorol. Atmos. Phys., 2006; doi: 10.1007/s00703-006-0193-0 (and references therein)

  • Tao, S. and Chen, L., A review of recent research on the East Asian summer monsoon in China. In Monsoon Meteorology (eds Chang, C. P. and Krishnamurti, T. N.), Oxford University Press, Oxford, UK, 1987, pp. 60–92.

  • Wang, B. and Xu, X., Northern hemisphere summer monsoon singularities and climatological intraseasonal oscillation. J. Climate, 1997, 10, 1071–1085.

  • Wu, R. and Wang, B., Multi-stage onset of the summer monsoon over the western North Pacific. Clim. Dynam., 2000, 17, 277–289.

  • Yim, So-Young, Bin Wang and Xing, Wen, Prediction of early summer rainfall over South China by a physical-empirical model. Clim. Dyn., 2014, 43, 1883–1891; doi: 10.1007/s00382-0132014-3.

  • Ho Lin and Wang, B., The time-space structure of the Asian– Pacific summer monsoon: a fast annual cycle view. J. Climate, 2002, 15(15), 2001–2019.

  • Chen, G. T. J. and Chang, C. P., The structure and vorticity budget of an early summer monsoon trough (Mei-Yu) over southeastern China and Japan. Mon. Weather Rev., 1980, 108, 942–953.

  • Ding, Y. H., Monsoons over China, Kluwer Academic Publisher, Dordrecht, Boston and London, 1994, p. 419.

  • Shaman, J. and Tziperman, E., Summertime ENSO–North African–Asian Jet teleconnection and implications for the Indian monsoons. Geophys. Res. Lett., 2007, 34, L11702, doi: 10.1029/ 2006GL029143.

  • IMD, Monsoon 2014, a report, 2015, IMD Met. Monograph ESSO/IMD/Synoptic Met/01, 2015.


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  • El Nino and the Indian Rainfall in June

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Authors

Sulochana Gadgil
Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, India
P. A. Francis
Indian National Centre for Ocean Information Services, Ministry of Earth Sciences, Hyderabad 500 090, India

Abstract


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.

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DOI: https://doi.org/10.18520/cs%2Fv110%2Fi6%2F1010-1022