| Abstract |
The purpose of this study is to investigate the ENSO-driven effects on temperature and precipitation in Taiwan. The indices of ENSO used in the study include equatorial Pacific sea surface temperature (SST) anomalies, Southern Oscillation Index and Multivariate ENSO Index. The temperature and precipitation data are selected from long-term weather stations in plains, mountains and outlying islands of Taiwan. This study applies cross-correlation analysis to observe the ENSO effects on temperature, precipitation and time lag in Taiwan. In addition, ENSO events are divided into two types, Eastern Pacific (EP) ENSO and Central Pacific (CP) ENSO. Effects due to different types of ENSO on temperature, precipitation and time lag in Taiwan are examined. Finally, some stronger ENSO events in the late 20th century, including three El Niño events and three La Niña events, are chosen to observe the changes of temperature and precipitation in Taiwan between the current year and the following year.
The results show a positive correlation between ENSO and the temperature in Taiwan. When El Niño occur, the temperature will be higher in Taiwan, where the effects of EP El Niño is obviously more influential than CP El Niño; when La Niña occur, the temperature will be lower in Taiwan, and the effects of CP La Niña is obviously more influential than EP La Niña. As for precipitation, the ENSO effects on precipitation in Taiwan are inconsistent and with low correlations. However, it shows that some ENSO events affect the spring rainfall in the following year. |
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