XU Ying, LIN Mingsen, ZHENG Quanan, YE Xiaomin, LI Junyi, ZHU Benlu. A study of long-term sea level variability in the East China Sea[J]. Acta Oceanologica Sinica, 2015, 34(11): 109-117. doi: 10.1007/s13131-015-0754-0
Citation: XU Ying, LIN Mingsen, ZHENG Quanan, YE Xiaomin, LI Junyi, ZHU Benlu. A study of long-term sea level variability in the East China Sea[J]. Acta Oceanologica Sinica, 2015, 34(11): 109-117. doi: 10.1007/s13131-015-0754-0

A study of long-term sea level variability in the East China Sea

doi: 10.1007/s13131-015-0754-0
  • Received Date: 2015-03-19
  • Rev Recd Date: 2015-06-02
  • From the analyses of the satellite altimeter Maps of Sea Level Anomaly (MSLA) data, tidal gauge sea level data and historical sea level data, this paper investigates the long-term sea level variability in the East China Sea (ECS). Based on the correlation analysis, we calculate the correlation coefficient between tidal gauge and the closest MSLA grid point, then generate the map of correlation coefficient of the entire ECS. The results show that the satellite altimeter MSLA data is effective to observe coastal sea level variability. An important finding is that from map of correlation coefficient we can identify the Kuroshio. The existence of Kuroshio decreases the correlation between coastal and the Pacific sea level. Kurishio likes a barrier or a wall, which blocks the effect of the Pacific and the global change. Moreover, coastal sea level in the ECS is mainly associated with local systems rather than global change. In order to calculate the long-term sea level variability trend, the empirical mode decomposition (EMD) method is applied to derive the trend on each MSLA grid point in the entire ECS. According to the 2-D distribution of the trend and rising rate, the sea level on the right side of the axis of Kuroshio rise faster than in its left side. This result supports the barrier effect of Kuroshio in the ECS. For the entire ECS, the average sea level rose 45.0 mm between 1993 and 2010, with a rising rate of (2.5±0.4) mm/a which is slower than global average. The relatively slower sea level rising rate further proves that sea level rise in the ECS has less response to global change due to its own local system effect.
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