Extreme Rainfall Events Throughout the Himalayas
Nandargi, S. and Dhar, O.N. 2011. Extreme rainfall events over the Himalayas between 1871 and 2007. Hydrological Sciences Journal 56: 930-945.
Working with data obtained from 475 measurement stations, the two Indian researchers proceeded to tabulate the frequency of occurrence of extreme one-day rainfalls within four magnitude categories: 250-300 mm, 300-400 mm, 400-500 mm and greater than 500 mm, focusing on the period of 1951-2007, for which a greater number of stations had more complete records.
With respect to their findings, Nandargi and Dhar write that "to summarize, it may be said that there is an increase in the frequencies of extreme rainfall events from the 1951-1960 decade onwards," but only until "there was a sudden decrease in the frequency of extreme rainfall events in all the four categories in the recent period of 2001-2007, during which time the prevailing monsoon conditions were comparatively weak."
In the concluding words of the paper the two scientists say "it is somewhat baffling as to whether climate change has any impact on extreme rainfall events in the entire Himalayan region, especially in the recent years of the period 2001-2007," demonstrating yet another example of the fact that we still have a lot to learn about what makes the real world tick.