#Precipitation totals for the year series

The results indicate that there is little trend in total precipitation for China as a whole, but there are distinctive regional and seasonal patterns of trends. Possible links between changes in total precipitation and frequency of extremes have also been explored. Crosses (×) indicate the area with statistical significance at the 5% levelīased on a newly developed daily precipitation dataset of 740 stations in China and more robust trend detection techniques, trends in annual and seasonal total precipitation and in extreme daily precipitation, defined as those larger than its 95th percentile for the year, summer, and winter half years, have been assessed for the period 1951–2000. Gray areas indicate regression coefficients greater than 0.3 while line-filled areas show regression coefficients less than 0.3. Positive (negative) values represent positive (negative) relationships.

Logistic linear regression coefficients between frequency of annual days of extreme precipitation and normalized precipitation totals fallen in nonextreme rain days over China. The fraction of extreme precipitation to annual totals 2 except for variations of percentage of areas in China that experienced much above normal occurrence of precipitation extremes Trend scales are equivalent to those in Fig. Solid (open) circles indicate increasing (decreasing) trends, respectively. Trends in the frequency of extreme precipitation days for (a) annual, (b) warm half year, and (c) cold half year series, respectively. The 95th percentiles of daily precipitation during 1961–90. Trends significant at the 5% level are marked by crosses (×) Trends larger than 7.5% decade −1, between 7.5% and 2.5% decade −1, and less than 2.5% decade −1 are represented by large, middle, and small circles, respectively. Units are percentage change over the corresponding 1961–90 averages. Trends in the (a) annual number of rain days and (b) annual average of daily rainfall during rain days. 3 but for (a) cold and (b) warm half years The two dashed lines indicate the locations of Yangtze River valley (south) and north China (north)Īs in Fig. White areas indicate rainfall amount less than 400 mm.

#Precipitation totals for the year series

Time series of summer precipitation (in mm) over eastern China along a 115☎ section. Those significant at the 5% level are marked by crosses (×) Trends that are larger than 7.5% decade −1, between 7.5% and 2.5% decade −1, and less than 2.5% decade −1 are marked by large, middle, and small circles, respectively. The solid (open) circles indicate increasing (decreasing) trends, respectively. Spatial distribution of trends for (a) annual, (b) winter, (c) spring, (d) summer, and (e) autumn normalized precipitation anomalies during 1951–2000. Bars represent annual values while solid curves are moving averages computed from an 11-yr binomial filter (a) Area-averaged time series of annual precipitation anomalies (in mm) and (b) normalized annual precipitation anomalies (in percentages) for China. Southwest, east, and south China are marked by SW, E, and S, respectively. These four regions constitute northern China. Northeast, north, eastern northwest, and western northwest China are marked by NE, N, ENW, and WNW, respectively. Schematic map of China with geographic regions mentioned in the text.