【作者】 王毅荣；

【Author】 Wang Yi-rong 1 ,2 ( Meteorological Bureau of Dingxi,Dingxi 743000,China)

【机构】 甘肃省定西市气象局；

【摘要】 利用40a月降水、气温资料,采用EOF分解和小波分析方法,分析了黄土高原地区月气候变化特征。结果表明:月降水、气温的全区一致性程度高,气温一致性程度高于降水;月降水、气温区域响应存在明显减少(下降)、明显增加(上升)和趋势不明显3种类型;降水明显减少和气温明显上升类型中气候演变在1985/1986年发生突变,变化趋势加剧,振荡周期复杂,主周期不明显;趋势不明显的类型中演变中没有明显阶段,振荡周期相对简单清晰,2～4a振荡周期显著;降水明显增加类型中气候演变在1977/1978年存在阶段点(界点),降水明显趋于增多;月降水趋势速度在-12.1mm/10a～6.3mm/10a之间,月气温速度在-0.185℃/10a～0.622℃/10a之间;月降水、气温与海温和副热带高压间存在一定的联系。黄土高原冬季增温不增湿,3月趋向冷湿,9月趋向暖干,6月有暖湿趋势。更多还原

【Abstract】 By investigating distributing of rainfall and temperature of month in China loess plateau from1961 to 2000, applying the EOF(empirical orthogonal function) and wavelet analysis on, results show there were jump-points in evolvement of month rainfall decreasing and month temperature increasing. The slopes of the rainfall and temperature were difference. The rate of month rainfall was during -12.1mm/10a～6.3mm/10a; temperature during -0.185℃/10a～0.622℃/10a. That the rainfall and temperature was obvious correlation were observed with SST (North pacific). Also the rain and temperature changes had the variation evolvement correspond with 2～4 years variation period weaken.更多还原