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http://dx.doi.org/10.7837/kosomes.2020.26.1.075

Effect of El Niño and La Niña on the Coastal Upwelling in East Sea, South Korea  

Seo, Ho-San (Research Center for Ocean Industrial Development, Pukyong National University)
Kim, Dong-Sun (Department of Ecological Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.26, no.1, 2020 , pp. 75-83 More about this Journal
Abstract
This study investigated the effects of El Niño and La Niña on coastal upwelling in the East Sea of Korea using long-term (1967-2017) water temperature observation data and Oceanic Niño Index (ONI). As a result of time series analysis of water temperature, the occurrence frequency of summer coastal upwelling was the highest in the southeastern (Ulgi ~ Gimpo) coast. In 1987-1988 and 1997-1998, when the annual fluctuations of ONI plunged more than 2.5, the water temperature in whole coast areas of the East Sea (Busan ~ Goseung) rose by 4 ~ 7 ℃. The temperature structure of the East Sea coastal water was different when El Niño was strong with ONI above 1.5 and La Niña with strong ONI below -0.8. When El Niño is strong, the water temperature anomaly in coastal waters is negative. This is due to the strong baroclinic tilting and the formation of shallow temperature stratification in the coastal waters. The strong La Niña season is opposite to the strong El Niño season, whereas the water temperature anomaly is positive. In addition, the baroclinic tilting is weaker than the time of strong El Niño and the temperature stratification is formed deeper than the time of strong El Niño. The formation of temperature stratification at shallow depths when El Niño is strong can increase the probability of occurrence coastal upwelling caused by southerly winds in the summer season. On the contrary, when La Niña is strong, occurrence of coastal upwelling is less likely even if the southerly wind blows continuously. This is because the temperature stratification is formed at deeper than when El Niño is strong.
Keywords
El $Ni{\tilde{n}}o$; La $Ni{\tilde{n}}a$; Coastal upwelling; Baroclinic tilting; Temperature stratification;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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