Long-term trends in pelagic environments of the east sea ecosystem |
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| Authors: | Chung Il Lee Jae-Young Lee Kwang-Ho Choi Sung-Eun Park |
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| Institution: | (1) Faculty of Marine Bioscience and Technology, Kangnung National University, 210-702 Gangneung, Korea;(2) Marine Environment Policy Team, Ministry of Maritime Affairs & Fisheries, 110-793 Seoul, Korea;(3) National Fisheries Research and Development Institute, 619-705 Busan, Korea |
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| Abstract: | Physical and biological environmental variations in the East Sea were investigated by analysing time-series of oceanographic data and meteorological indices. From 1971 to 2000, dominant periodicity in water temperature variations had two apparent periods of 3 to 4 years and of decades, especially in the southwestern part of the East Sea affected by the influence of inflowing Tsushima warm current. Fluctuating water temperature within a certain period appears to respond to El Niño events with a time lag. It was found that there was a strong correlation between water temperature and El Niño events with a time lag of 1.5 and 5.5 years for periods of 3 to 6 years and of decades, respectively. Corresponding with El Niño events, water temperature variability also showed strong correlation with shift and/or changes in biological and chemical environments of nutrient concentrations, zooplankton biomass, and fisheries. However, there also occurred a short-term periodicity of water temperature variations. Within a period of 1 to 4 years, a relatively short-term cycle of water temperature variation had strong correlation with other climate indices such as Pacific Decadal Oscillation and monsoon index. After comparing coherence and phase spectrum between water temperature and different climate indices, we found that there was a shift of coherent periods to another climate index during the years when climate regime shift was reported. |
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| Keywords: | East Sea climate index El Ni?o water temperature Tsushima Warm Current common squid |
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