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Why is the greatest change of precipitation the 90% probability level in winter and the 10% probabilty level in summer?

The general trend that is being projected under climate change for the UK is:

  • warmer wetter winters
  • hotter drier summers
Therefore we can expect a negative change in precipitation in summer and a positive change in precipitation in winter.

In detail

The 90% probability level shows the greatest positive change whereas the 10% probability level shows the greatest negative change if the PDF spans the 0 line. Therefore, we are interested in the increase of a positive change in precipitation in winter (the 90% probability level) and the decrease of precipitation (negative change) in summer(10% probability level).

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Proability distribution function showing the 90% probability level
 

Winter precipitation

What we are interested in here is if the trend in precipitation is to get wetter, how much wetter is it going to get? 90% probability level. Click on the image for a larger version.

 
Probabilty distribution function showing 10% probability level
 

Summer precipitation

What we are interested in here is if the trend in precipitation is to get drier, how much drier is it going to get? 10% probability level. Click on the image for a larger version.

 

Last Updated Tuesday, 11 January 2011