Abstract:

Based on the precipitation data from 6 weather stations in the southeast Chongqing from 1961 to 2011, the precipitation change characteristics were analyzed. The results show that the annual precipitation, spring and autumn precipitation are all in linear decreasing trends, especially for autumn precipitation. Summer and winter precipitation is in linear increasing trends, but these trends are not significant. The cycles of annual and seasonal precipitation are not same, and interdecadel cycles of summer and winter precipitation are significant. The days of annual rainfall, drizzle, moderate rain and heavy rain are in linear decreasing trends, especially for the last two variables. There is not significant change for rainstorm days. For interdecadal change, the increasing number of rainy days mainly appears in 1990s which is mainly from the contribution of the drizzle and rainstorm days, while moderate rain and heavy rain days occur seldom during this period. Rainy days seldom appear in 2000s, especially for drizzle, heavy rain and rainstorm, while moderate rain days are relatively high during this period.

Key words:  Southeast Chongqing, Precipitation, Climate change