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A study on drought features of the Indian summer monsoon 2002

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Abstract

In this paper, a diagnostic study is carried out with global analysis data sets to determine how the large scale atmospheric circulation affecting the anomalous drought of the Indian summer monsoon 2002. The daily analysis obtained from National Centre for Environmental Prediction/National Centre for Atmospheric Research (NCEP/NCAR) for the month of July is used to investigate the mean circulation characteristics and the large scale energetics over the Indian monsoon domain. Examination of rainfall revealed that the summer monsoon (JJAS) rainfall of 2002 over India is 22% below normal in which the large deficit of 56% below normal rainfall in July. The recent past drought during summer season of 2004 and 2009 are 12 and 23%, respectively, below normal rainfall. The large deficit of rainfall in 2009 is from the June month with 48% below normal rainfall, where as 2004 drought contributed from July (19%) and August (24%). Another significant facet of the rainfall in July 2002 is lowest ever recorded in the past 138 years (1871–2008). The circulation features illustrated weak low level westerly wind at 850 hPa (Somali Jet) in July during large deficit rainfall years of 1987 and 2002 with a reduction of about 30% when compared with the excess and normal rainfall years of 1988 and 2003. Also, tropical easterly jet at 150 hPa reduced by 15% during the deficit rainfall year of 2002 against the excess rainfall year of 1988. Both the jet streams are responsible for low level convergence and upper level divergence leading to build up moisture and convective activity to sustain the strength of the monsoon circulation. These changes are well reflected in reduction of tropospheric moisture profile considerably. It is found that the maximum number of west pacific cyclonic system during July 2002 is also influenced for large deficit rainfall over India. The dynamic, thermodynamic and energetic clearly show the monsoon break type situation over India in the month of July 2002 resulting less convective activity and the reduction of moisture. The large diabatic heating, flux convergence of heat and moisture over south east equatorial Indian Ocean are also responsible for drought situation in July 2002 over the Indian region.

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Acknowledgments

The authors sincerely acknowledge the NCEP/NCAR for providing the reanalysis data and Indian Meteorological Department (IMD) for providing gridded rainfall data sets for this study. Also, the authors thank to anonymous reviewers for their constructive comments and suggestions which further improvement of the manuscript.

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Authors and Affiliations

  1. Asian Disaster Preparedness Center, Asian Institute of Technology Campus, Klong Luang, Pathumthani, 12120, Thailand

    P. V. S. Raju

  2. Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India

    U. C. Mohanty

  3. Department of Atmospheric Sciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan

    H.-H. Hsu

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  1. P. V. S. Raju
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  2. U. C. Mohanty
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  3. H.-H. Hsu
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Correspondence to P. V. S. Raju.

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Raju, P.V.S., Mohanty, U.C. & Hsu, HH. A study on drought features of the Indian summer monsoon 2002. Meteorol Atmos Phys 108, 43–55 (2010). https://doi.org/10.1007/s00703-010-0082-z

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  • DOI: https://doi.org/10.1007/s00703-010-0082-z

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