用海表温度差重新定义的ENSO指数的比较  

Comparative Study of ENSO Index Redefined by Sea Surface Temperature Difference

作　　者：张济世[1] 牛晓宁[1] 王岗[1] 王志洋[1] 赵亚锋[1] 巫春平[1] 许卷卷[1] ZHANG Ji shi;NIU Xiao ning;WANG Gang;WANG Zhi yang;ZHAO Ya feng;WU Chun ping;XU Juan juan(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《兰州交通大学学报》2018年第4期85-92,共8页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金重大项目(41690141);国家自然科学基金面上项目(41671029)

摘　　要：厄尔尼诺-南方涛动(ENSO)作为全球尺度海气相互作用的重要指标,在过去的一个世纪中受到学术界强烈关注,且定义了很多指标以精确描述ENSO现象.在实际相关性研究中,南方涛动指数(SOI)或多元ENSO综合指数(MEI)与降水径流的遥相关系数大都低于0.1,不能真实反映ENSO与水文气候影响程度.试定义一个新的ENSO指数以提高ENSO与实际数据的相关性,并且与SOI和MEI进行比较以确定该指数的可靠性.选择塔希提岛附近海域(130°W^155°W,4°N^10°N)和达尔文港附近海域(90°W^150°W,4°S^4°N)海表温度的平均值之差(SSTD)作为新的ENSO指数,与全球的径流据进行相关分析,结果表明SSTD相对于SOI和MEI的相关性增加了0.9~4.2倍.El Nino Southern Oscillation （ENSO）,as an important indicator of global air sea interaction,has received much attention from the academic world in the past century.Many indicators have been defined to describe ENSO phenomena accurately.In real correlation studies,the teleconnection coefficients of both SOI and MEI with precipitation runoff are mostly lower than 0.1,which can not accurately reflect the impact of ENSO on hydrological climate.A new ENSO index was defined to improve the correlation between ENSO and actual data,and was compared with Southern Oscillation Index （SOI） and Multivariate ENSO index （MEI） to determine the reliability of the index.The sea surface temperature difference （SSTD） of the nearby waters of Tahiti Island（130°～155°W,4°～10°N） and of Port Darwin（90°～150°W,4°S～4°N） was selected as a new ENSO index.Correlation analysis was conducted between the index and global runoff data.The results showed that,compared with SOI and MEI,the correlation of SSTD with runoff increased by 0.9-4.2 times.

关 键 词：海表温差 重新定义ENSO指数 简单相关系数 

分 类 号：P732[天文地球—海洋科学]