大气和海洋科学快报：英文版2012，Vol.5Issue(5)：414-419,6.
A New Approach for Classifying Two Types of El Nifio Events
A New Approach for Classifying Two Types of El Nifio Events
摘要
Abstract
In recent decades, the typical E1 Nifio events with the warmest SSTs in the tropical eastern Pacific have become less common, and a different of E1 Nifio with the wannest SSTs in the central the east and west by cooler Pacific, which is flanked on SSTs, has become more frequent. The more recent type of E1 Nifio was referred to as central Pacific E1 Nifio, warm pool E1 Nifio, or dateline E1 Nifio, or the E1 Nifio Modoki. Central Pacific E1 Nifio links to a different tropical-to-extratropical teleconnection and exerts different impacts on climate, and several clas- sification approaches have been proposed. In this study, a new classification approach is proposed, which is based on the linear combination (sum or difference) of the two leading Empirical Orthogonal Functions (EOFs) of tropi- cal Pacific Ocean sea surface temperature anomaly (SSTA), and the typical E1 Nifio index (TENI) and the central E1 Nifio index (CENI) are able to be derived by projecting the observed SSTA onto these combinations. This classification not only reflects the characteristics of non-orthogonality between the two types of events but also yields one period peaking at approximate two to seven years. In particular, this classification can distin- guish the different impacts of the two types of events on rainfall in the following summer in East China. The typi- cal E1 Nifio events tend to induce intensified rainfall in the Yangtze River valley, whereas the central Pacific El Nifio tends to induce intensified rainfall in the Huaihe River valley. Thus, the present approach may be appropriate for studying the impact of different types of E1 Nifio on the East Asian climate.关键词
分类方法/类型/事件/太平洋海温/热带太平洋/El/表层海水温度/经验正交函数Key words
typical E1 Nifio/central E1 Nifio/classifica-tion/summer rainfall in eastern China分类
天文与地球科学引用本文复制引用
LI Shuanglin,WANG Qin..A New Approach for Classifying Two Types of El Nifio Events[J].大气和海洋科学快报：英文版,2012,5(5):414-419,6.基金项目
This study was supported by the National Basic Research Program of China, ＂Oceanic circulation, structure characteristics, variation mechanisms, and climate effects of the warm pool in the tropical Pacific＂, under Grant 2012CB417403 （）
