Characteristics of residual water level variation along China coast and its relation to sea level change

Wang Hui; Liu Kexiu; Fan Wenjing; Zhang Zengjian; Xu Shanshan; Liu Shouhua

doi:10.3969/j.issn.0253-4193.2017.06.002

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Wang Hui, Liu Kexiu, Fan Wenjing, Zhang Zengjian, Xu Shanshan, Liu Shouhua. Characteristics of residual water level variation along China coast and its relation to sea level change[J]. Haiyang Xuebao, 2017, 39(6): 10-20. doi: 10.3969/j.issn.0253-4193.2017.06.002

Citation:

Wang Hui, Liu Kexiu, Fan Wenjing, Zhang Zengjian, Xu Shanshan, Liu Shouhua. Characteristics of residual water level variation along China coast and its relation to sea level change[J]. Haiyang Xuebao, 2017, 39(6): 10-20. doi: 10.3969/j.issn.0253-4193.2017.06.002

Citation:

Wang Hui, Liu Kexiu, Fan Wenjing, Zhang Zengjian, Xu Shanshan, Liu Shouhua. Characteristics of residual water level variation along China coast and its relation to sea level change[J]. Haiyang Xuebao, 2017, 39(6): 10-20. doi: 10.3969/j.issn.0253-4193.2017.06.002

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Characteristics of residual water level variation along China coast and its relation to sea level change

doi: 10.3969/j.issn.0253-4193.2017.06.002

National Marine Data & Information Service, Tianjin 300171, China

Received Date: 2016-04-18
Rev Recd Date: 2016-09-18

Abstract

Abstract

By analyzing 25 stations' sea level data, this paper preliminarily investigate the characteristics of residual water level variation along China coast and its relation to sea level change during 1980-2012. The results show: (1) Residual water level along China coast has significant seasonal variation. As the weather condition is the same in the adjacent stations, the procedure of residual water level variation is similar. From spatial distribution, residual water level variation along China coast presents obviously regional characteristics, and the amplitude of variation is big in middle, small in south and north. From Yangtze River to the coastal region of Guangdong, the amplitude of residual water level variation is largest, and the average annual range is 5.0-7.5 cm. From the coast of Hainan to the coast of Beibu Gulf, the amplitude of residual water level variation is larger, and the average annual range is 4.0-5.5 cm. From the coast of Bohai Sea to the coast of Yellow Sea, the amplitude of residual water level variation is small, and the average annual range is 3.3-3.5 cm. (2) From temporal variation, average annual residual water level basically has no tendency change during 1980-2012, but it has a 2-5 a periodic signal. The oscillation amplitude is 0.1 cm. Correlation coefficient between the monthly residual water level time sequence and Niño3.4 index is -0.5, which passed the significance test. It shows that the monthly residual water level is associated with ENSO. (3) Residual water level time variation and spatial distribution characteristic along China coast are all different from sea level. 1980-2012, the rise rate of China coast sea level is 2.9 mm/a, but there is almost no long-term tendency change in residual water level. In addition, the seasonal variation of residual water level and sea level is inconsistent in time and area. (4) Residual water level has an impact on short-term sea level change, and the magnitude of the impact is based on its residual water level. The long time increasing water make the sea level higher, and its maximum contribution rate is 65%. On the contrary, the long time decreasing water make the sea level lower.
- residual water level,
- sea level,
- period,
- ENSO

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References(18)

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