摘要
利用1961-2010年中国地面降水日值格点数据集,采用百分位阈值、小波分析和MK检验等方法,对楚雄州汛期极端降水的时空分布特征进行了分析.结果表明:1极端降水阈值、极端降水总量及极端降水强度的空间分布具有一致性,呈现由东北-西南连线分别向西北及东南部递减,东北-西南一线呈现由东北及西南两端向中部递减的趋势;极端降水日数呈现出由南部及东北部向北部及西北部递减的趋势.2极端降水总量及极端降水日数具有较为显著且一致的年际波动特征,而极端降水强度年际波动特征不明显.3极端降水总量及极端降水强度均呈不明显上升趋势,而极端降水日数无明显变化.4极端降水总量、极端降水日数及极端降水强度均存在25年左右的主震荡周期,且极端降水总量与极端降水日数周期变化较为一致.
The spatiotemporal distribution variation of extreme precipitation in flood season have been analyzed with the datasets of daily grid-based precipitation over China and methods including percentile threshold,morlet wavelet analysis and Mann-Kendall test in Chuxiong from 1961 to 2010.The results show that1）the distribution of threshold values,rainfall and intensity of extreme precipitation are nearly consistent,shown an decreased trend from the northeast-southwest to northwest and southeast and the northeastsouthwest shown a decreased trend from northeast and southwest to the centre,while the distribution of days shown an decreased trend from south to north and northeast to northwest;2）rainfall and days of extreme precipitation events present obvious annual undulation feature while intensity is not obvious;3）rainfall and intensity of extreme precipitation events show increasing trend but not obvious,and trend of days of extreme precipitation events are not obvious;4）rainfall,days and intensity of extreme precipitation events exist around 25 years major oscillation cycles,and periodic change of rainfall and intensity of extreme precipitation events are nearly consistent.
出处
《西南师范大学学报（自然科学版）》
CAS
北大核心
2017年第2期120-126,共7页
Journal of Southwest China Normal University(Natural Science Edition)
基金
国家自然科学基金面上项目"中小学校园气象灾害恢复力多维评估体系与综合减灾模式"(71373130)
关键词
极端降水
百分位阈值
小波分析
MK检验
楚雄
precipitation extremes
percentile threshold
morlet wavelet analysis
Mann-Kendall test
Chuxiong state
