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Geophysical Monograph Series



  • extreme events
  • trends
  • Indian monsoon
  • monsoon rainfall
  • low-pressure systems
  • surface temperature

Index Terms

  • 3305 Atmospheric Processes: Climate change and variability
  • 3374 Atmospheric Processes: Tropical meteorology
  • 3354 Atmospheric Processes: Precipitation
  • 3307 Atmospheric Processes: Boundary layer processes



Extreme Events and Trends in the Indian Summer Monsoon

V. Krishnamurthy

The extreme events and trends in low-pressure systems (LPSs), rainfall, and surface air temperature over the Indian monsoon region are examined in this study using long records of daily data. A review of recent studies on the extreme events over India is presented, and results from new and extended analyses are also included. The number of days when LPSs exist (or LPS days) has an increasing trend during 1930–2003. In recent years, the LPS days of depressions have shown a decreasing trend, while the lows and cyclonic storms have shown increasing trends. The moderate rainfall events over central India (CI) and Western Ghats have decreased during 1951–2004, while heavy and very heavy rainfall events have increased during this period. This has resulted in a decreasing trend in the seasonal mean rainfall and an increasing trend in the seasonal variance of daily rainfall over the two regions. The daily mean surface air temperature and the daily maximum temperature both have increasing trends in their respective seasonal means over CI during 1969–2005. The very high temperature events of both daily mean and daily maximum have increasing trends, while the moderate events show decreasing trends.

Citation: Krishnamurthy, V. (2012), Extreme events and trends in the Indian summer monsoon, in Extreme Events and Natural Hazards: The Complexity Perspective, Geophys. Monogr. Ser., vol. 196, edited by A. S. Sharma et al. 153–168, AGU, Washington, D. C., doi:10.1029/2011GM001122.

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