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Special Session 5: Ocean-atmosphere interaction, multi-scale climate variability and their implication for biogeochemical processes |
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Interannual variability of summer cold dome northeast of Taiwan
SS5-03
Yu-Hsin Cheng* , College of Ocean and Earth Sciences, Xiamen University
Jianyu Hu, College of Ocean and Earth Sciences, Xiamen University
Quanan Zheng, Department of Atmospheric and Oceanic Science, University of Maryland College Park
Presenter Email: yuhsin@xmu.edu.cn
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| Multi-sensor data from different satellites are analyzed to study the interannual variability of summer cold dome on the northeast of Taiwan, which is associated with the El Niño-Southern Oscillation. From the empirical orthogonal function analysis on the along-track satellite altimeter data, eigenvector of mode 1 reveals cold dome phenomenon around 122.6¡ãE and 25.4¡ãN and its principal component shows two significant periods, annual and 4¨C6 year variations, for a 90% confidence level. Cold dome intensifies in the La Niña summers, whose probability can increase to 27% and extent expands 15% to 2,170 km2, whereas it shows the opposite behavior in the El Niño summers. Area of cold dome (5,583 ¡À 2,734 km2) and minimum temperature inside the cold dome (27.1¡ã ¡À 0.8¡ãC) are larger and lower in the La Niña summers, respectively, than those in the El Niño summers. |
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