黄土高原汛期降水年代际演变  

Decennial Evolvement of Abnormal Rainfall During Flood Season over the Loess Plateau

作　　者：王毅荣[1] 张旭东 冯建英 

机构地区：[1]中国气象局 兰州干旱气象研究所 甘肃省干旱气候变化与减灾重点实验室中国气象局 干旱气候变化与减灾重点开放实验室,甘肃兰州730020 [2]兰州区域气候中心,甘肃兰州730020

出　　处：《水土保持通报》2007年第6期67-70,119,共5页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目(40675066);科技部社会公益研究专项"中国干旱气象灾害监测预警方法研究"(2004DIB5J192)

摘　　要：利用黄土高原区域40 a的降水资料,研究汛期降水年代际演变。结果表明,黄土高原汛期旱涝交错的变化幅度不断减小;降水带南移雨量带南移。20世纪80年代较60年代南移0.6个纬度,90年代南移约1.8个纬度(高原东部地区南移4个纬度)。前3个模态演变的转折(突变)时间和显著程度不同,但其振荡强度和周期的阶段性与降水对应较好。多雨期降水变幅大,周期短,振荡强。少雨期对应多周期,弱振荡。降水异常的敏感区年代际变动明显,演化路径基本由东北向西南移动,高原西部旱涝灾害趋向频繁。The decennial evolvement of abnormal rainfall in flood season over the Loess Plateau of China were studied using the rainfall data of the recent 40 years. Results showed that the range of abnormal rainfall decreased in flood season. The rainfall belt significantly shifted to the south with 1.8 lat. degrees from 1960s to 1990s and 0.6 lat. degrees from 1960s to 1980s. Each of the first 3 models of rainfall had different change points and periods, but multiple periods and weak surges corresponded with rainy time, being contrary to the time of rain shortage. The region sensitive to abnormal rainfall flowed from northeast to southwest. The west part of the Loess Plateau tended to be arid.

关 键 词：黄土高原 汛期 降水 区域响应 

分 类 号：P461[天文地球—大气科学及气象学]