Trends in Total Precipitation and Frequency of Daily Precipitation Extremes

Base on daily precipitation dataset of 55 stations in Xinjiang, China and apply STARS (Sequential t-test analysis of regime shifts) techniques, trends in annual and seasonal total precipitation and extreme daily precipitation, assessed for 1961-2008. The results indicate that there is little trend in total precipitation for Xinjiang as a whole, but there are distinctive regional and seasonal patterns of trends. During of 1961-2000, there were two regimes of the annual total precipitation; one shift happened in 1987. Before the shift, are-averaged time series of annual total precipitation was 118.6mm cubic meters per year; after that, it decreased and are-averaged time series of annual total precipitation was 145.8mm per year.