重庆市干旱时空分布规律研究

以重庆市34个气象站点1961-2016年的日降水量数据为基础,参照重庆市干旱标准,研究重庆市季节性干旱的干旱频率、干旱持续天数及干旱站次比的时空分布规律.结果表明:①重庆市伏旱频率最高,其次是夏旱、春旱、秋旱和冬旱频率;②重庆市各季节性干旱持续天数高值区多集中于渝西部及渝东北地区,春旱及冬旱持续天数总体呈下降趋势,秋旱持续天数总体呈上升趋势;③重庆市各季节性干旱站次比长期来看无明显的增加或减少变化趋势,但阶段性及周期性变化显著.

Research of the Temporal and Spatial Distribution of Drought in Chongqing

According to the daily precipitation data of the 34 meteorological stations in Chongqing from 1961 to 2016, the temporal and spatial distribution of drought frequency, the days of drought and the ratio of dry stations of the seasonal droughts in Chongqing were studied based on the drought standard of Chongqing. The results were as follows. The frequency of midsummer drought in Chongqing was the highest, followed by the frequency of summer drought, spring drought, autumn drought and winter drought. In the period studied (1961 to 2016), the high value areas of seasonal drought lasting days in Chongqing were mostly concentrated in the western Chongqing areas and the northeastern Chongqing regions. The drought lasting days of spring and winter decreased, and the drought lasting days of autumn increased steadily in Chongqing. There was no obvious increase or decrease in the ratio of dry stations of seasonal droughts in Chongqing in the long-term, but the staged and cyclical changes were significant.