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Interannual variability of transport and bifurcation of the North Equatorial Current in the tropical North Pacific Ocean |
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| Authors: | Fangguo Zhai Dunxin Hu |
| 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: | The relationship of the interannual variability of the transport and bifurcation latitude of the North Equatorial Current (NEC) to the El Ni?o-Southern Oscillation (ENSO) is investigated. This is done through composite analysis of sea surface height (SSH) observed by satellite altimeter during October 1992–July 2009, and correspondingly derived sea surface geostrophic currents. During El Ni?o/La Ni?a years, the SSH in the tropical North Pacific Ocean falls/rises, with maximum changes in the region 0–15°N, 130°E–160°E. The decrease/increase in SSH induces a cyclonic/anticyclonic anomaly in the western tropical gyre. The cyclonic/anticyclonic anomaly in the gyre results in an increase/decrease of NEC transport, and a northward/southward shift of the NEC bifurcation latitude near the Philippine coast. The variations are mainly in response to anomalous wind forcing in the west-central tropical North Pacific Ocean, related to ENSO events. |
| Keywords: | North Equatorial Current interannual variability NEC bifurcation El Ni o-Southern Oscillation |
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