Preprints
https://doi.org/10.5194/os-2021-3
https://doi.org/10.5194/os-2021-3
28 May 2021
 | 28 May 2021
Status: this preprint has been withdrawn by the authors.

Long-period solar annual and semiannual tidal contributions to the lowest normal low water in seas surrounding China

Yanguang Fu, Dongxu Zhou, Yikai Feng, and Xinghua Zhou

Abstract. As the chart datum of China, the lowest normal low water (LNLW) was calculated using three tidal constituents, major (Q1, O1, P1, K1, N2, M2, S2 and K2), shallow water (M4, MS4 and M6) and long-period tidal (Sa and Ssa). The construction of a tidal datum is mainly concerned with improvements in the major tidal constituents, and the contribution of the long-period tidal component has been generally neglected. In this study, long-term tide gauge observations and multi-mission satellite altimetry data were used to investigate the spatial distribution of the long-period tidal contribution in Chinese seas and analyze the relative long-period tidal contribution rate into four regions. The results showed that the mean contribution in Chinese seas is 7.63 %, with the largest contribution in the Bohai Sea (11.33 %) and smallest in the East China Sea (5.27 %). Differences between tide gauge and satellite-derived results were compared in detail. The Sa and M2 tidal amplitudes are the main factors affecting the long-period tidal contribution to the LNLW. The relative long-period tidal contribution can be up to 34.18 % when tide gauge observations record small M2 and large Sa amplitudes. These results indicate that the long-period tidal constituent cannot be neglected in the establishment of the LNLW datum. Therefore, to improve tidal datum precision, precise extraction and accuracy assessments of long-period tidal constituents should be a research focus.

This preprint has been withdrawn.

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Yanguang Fu, Dongxu Zhou, Yikai Feng, and Xinghua Zhou

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-3', Anonymous Referee #1, 25 Jun 2021
  • RC2: 'Comment on os-2021-3', Anonymous Referee #2, 25 Jun 2021

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-3', Anonymous Referee #1, 25 Jun 2021
  • RC2: 'Comment on os-2021-3', Anonymous Referee #2, 25 Jun 2021
Yanguang Fu, Dongxu Zhou, Yikai Feng, and Xinghua Zhou
Yanguang Fu, Dongxu Zhou, Yikai Feng, and Xinghua Zhou

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Short summary
In this study, long-term tide gauge observations and multi-mission satellite altimetry data were used to investigate the spatial distribution of the long-period tidal contribution in Chinese seas and analyze the relative long-period tidal contribution rate into four regions. The result indicate that the long-period tidal constituent cannot be neglected in the establishment of the LNLW datum to improve tidal datum precision.