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Sea surface height variations in the Mindanao Dome region in response to the northern tropical Pacific winds |
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| Authors: | Dan Song Dunxin Hu Fangguo Zhai |
| Institution: | 1. Key Laboratory of Ocean Circulation and Waves, Chinese Academy of Sciences, Qingdao, 266071, China 2. Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China 3. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China |
| Abstract: | Sea surface height (SSH) variability in the Mindanao Dome (MD) region is found to be one of the strong variations in the northern Pacific. It is only weaker than that in the Kuroshio Extension area, and is comparable to that in the North Pacific Subtropical Countercurrent region. Based on a 1.5-layer reduced gravity model, we analyzed SSH variations in this region and their responses to northern tropical Pacific winds. The average SSH anomaly in the region varies mainly on a seasonal scale, with significant periods of 0.5 and 1 year, ENSO time scale 2–7 years, and time scale in excess of 8 years. Annual and long-term variabilities are comparably stronger. These variations are essentially a response to the northern tropical Pacific winds. On seasonal and ENSO time scales, they are mainly caused by wind anomalies east of the region, which generate westward-propagating, long Rossby waves. On time scales longer than 8 years, they are mostly induced by local Ekman pumping. Long-term SSH variations in the MD region and their responses to local winds are examined and discussed for the first time. |
| Keywords: | 1 5-layer model Mindanao Dome (MD) sea surface height (SSH) Ekman pumping |
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