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The Indian summer monsoon drought of 2002 and its linkage with tropical convective activity over northwest Pacific

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Abstract

The Indian subcontinent witnessed a severe monsoon drought in 2002, which largely resulted from a major rainfall deficiency in the month of July. While moderate El Nino conditions prevailed during this period, the atmospheric convective activity was anomalously enhanced over northwest and north-central Pacific in the 10–20°N latitude belt; and heavy rainfall occurred over this region in association with a series of northward moving tropical cyclones. Similar out-of-phase rainfall variations over the Indian region and the northwest (NW) Pacific have been observed during other instances of El Nino/Southern Oscillation (ENSO). The dynamical linkage corresponding to this out-of-phase rainfall variability is explored in this study by conducting a set of numerical experiments using an atmospheric general circulation model. The results from the model simulations lend credence to the role of the tropical Pacific sea surface temperature anomalies in forcing the out-of-phase precipitation variability over the NW Pacific and the Indian monsoon region. It is seen that the ENSO induced circulation response reveals an anomalous pattern comprising of alternating highs and lows which extend meridionally from the equatorial region into the sub-tropic and mid-latitude regions of west-central Pacific. This meridional pattern is associated with an anomalous cyclonic circulation over NW Pacific, which is found to favor enhanced tropical cyclonic activity and intensified convection over the region. In turn, the intensified convection over NW Pacific induces subsidence and rainfall deficiency over the Indian landmass through anomalous east-west circulation in the 10–20°N latitude belt. Based on the present findings, it is suggested that the convective activity over NW Pacific is an important component in mediating the ENSO-monsoon teleconnection dynamics.

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Acknowledgments

The authors thank the Director, IITM, for providing the encouragement to carry out this work. The authors are grateful to the two anonymous reviewers and the editor for their careful reviews and comments. We acknowledge the support from Dr. Greg Miller, USGS, with the GMT graphic software. This work was supported under the DOD/INDOMOD-SATCORE (ISP 1.5) project, Government of India.

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  1. Climate and Global Modelling Division, Indian Institute of Tropical Meteorology, Pashan, NCL Post, Pune, 411008, India

    Milind Mujumdar, Vinay Kumar & R. Krishnan

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  1. Milind Mujumdar
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  2. Vinay Kumar
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  3. R. Krishnan
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Correspondence to Milind Mujumdar.

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Mujumdar, M., Kumar, V. & Krishnan, R. The Indian summer monsoon drought of 2002 and its linkage with tropical convective activity over northwest Pacific. Clim Dyn 28, 743–758 (2007). https://doi.org/10.1007/s00382-006-0208-7

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  • DOI: https://doi.org/10.1007/s00382-006-0208-7

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