| Summary: | 碩士 === 國立臺灣海洋大學 === 海洋環境資訊學系 === 101 === In this study, different index values are used to select months of El Niño, El Niño Modoki, La Niña and La Niña Modoki, respectively. This case selection method (also called Niño Matrix Method) is applied to NCEP/NCAR reanalysis data to investigate the impacts of two-type El Niño/La Niña on sea surface wind over the tropical Pacific druing years of 1950~2011. The results show that the impacts of both types of El Niño/La Niña on sea surface wind over the tropical Pacific are different. Westerly anomalies of wind speed appear in the equatorial Pacific during both types of El Niño, while the values of El Niño Modoki are stronger than those of El Niño. The location with maximum value of westerly anomalies of El Niño Modoki is far west of that of El Niño. In the western Pacific near land, easterly anomalies of El Niño Modoki are also larger than those of El Niño. As for La Niña, easterly anomalies of wind speed appeare in the equatorial Pacific during both types of La Niña. The values of La Niña Modoki are stronger than those of La Niña. The range of easterly anomalies of La Niña Modoki is smaller than that of La Niña. During the period of La Niña Modoki, westerly anomalies also appear in the eastern Pacific.
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