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Impacts of the Two Types of El Ni?o on pacific Tropical Cyclone Activity

Journal of Ocean University of China 2015年第2期14卷 191-198页

作者： XU Shibin HUANG Fei Physical Oceanography Laboratory & Key Laboratory of Ocean-Atmosphere Interaction and Climate in Universities of Shandong Ocean University of China International pacific Research Center School of Ocean and Earth Science and Technology University of Hawaii at Manoa Ningbo Collabrative Innovation Center of Nonlinear Harzard System of Ocean and Atmosphere Ningbo University

It is well known that Tropical cyclone （TC） activities over the pacific are affected by E1 Nino events. In most studies El Nifio phenomena have been separated into east pacific warming （EPW） and central pacific wanning （CPW） based on the location of maximum SST anomaly. Since these two kinds of El Nino have different impacts on pacific tropical cyclone activities, this study investigates different features of TC activities and the genesis potential index （GPI） during EPW years and CPW years. Four eontrib- nting factors, i.e., the low-level absolute vorticity, the relative humidity, the potential intensity and the vertical wind shear, are exam- ined to determine which factors are most important in causing the anomalous TC activities. Our results show that during EPW years in July-August （JA-0）, TC activities are more frequent with stronger intensity over the Western North pacific （WNP） and eastern North pacific （ENP）. The maximum anomaly center of TC activities then drifts eastward siguifieantly in September-October （SO-0）. However, centers of anomalous TC activity barely change from JA-0 to SO-0 during CPW years. In January-February-March （JFM-1） of the decaying years of warming events, TC frequency and intensity both have positive anomaly over the South pacific, The anoma- lies in EPW years have larger amplitude and wider spatial distribution than those in CPW years. These anomalous activities of TC are associated with GPI anomaly and the key factors affecting GPI anomaly for each ocean basin are quite different.

关键词： tropical cyclone eastern pacific warming central pacific wanning GPI

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