Multi-frequency variability and mechanism of intra-seasonal sea surface height in the Sulawesi Sea

Mao Zhibang; Wang Lu; Li Junyi; Xie Lingling; Zheng Quanan

doi:10.12284/hyxb2024001

Volume 46 Issue 2

May 2024

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Mao Zhibang，Wang Lu，Li Junyi, et al. Multi-frequency variability and mechanism of intra-seasonal sea surface height in the Sulawesi Sea[J]. Haiyang Xuebao，2024, 46(2)：14–27 doi: 10.12284/hyxb2024001

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Multi-frequency variability and mechanism of intra-seasonal sea surface height in the Sulawesi Sea

doi: 10.12284/hyxb2024001

Mao Zhibang^{1, 2, 3
,},
Wang Lu^{1, 4},
Li Junyi^{1, 2, 3},
Xie Lingling^{1, 2, 3
,
,},
Zheng Quanan⁵

1.
College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
2.
Key Laboratory of Climate, Resources and Environment of Guangdong Higher Education Institutions on the Shelf and in the Deep Ocean, Zhanjiang 524088, China
3.
Key Laboratory of Space Ocean Remote Sensing and Application, Ministry of Natural Resources, Beijing 100081, China
4.
Department of Navigation, Naval Petty Officer Academy, Bengbu 233012, China
5.
Department of Atmospheric and Ocean Sciences, University of Maryland, College Park 20742, USA

Received Date: 2023-09-03
Rev Recd Date: 2023-12-26

Available Online: 2024-05-22

Publish Date: 2024-05-29

Abstract

Abstract

Based on the satellite altimeter observation data from 1993 to 2022, this paper analyzes the temporal and spatial characteristics of the multi frequency seasonal variation signal of sea surface height in the Sulawesi sea, and gives the dynamic interpretation by using Rossby standard mode theory. The spectral analysis shows that there is a strong intra-seasonal signal of 30–90 days in the sea surface height variation of Sulawesi sea, and its average power spectral density is 13 times of the average power spectral density of the signal in half a year. These seasonal signals have discrete and discontinuous spectral peak periods, and the peaks of 54.0 d and 64.4 d are the largest, which are 28 times and 23 times of the signal of 30–90 days, respectively. The theoretical analysis shows that the existence of Rossby standard modes in the nearly closed Sulawesi deep-sea basin. The seasonal variation observed by satellite altimeter is consistent with the two-dimensional spatial structure evolution, period and westward propagation velocity of Rossby standard mode results, the superposition of Rossby standard mode solutions presents a variance distribution similar to the sea surface height variation field. This shows that the inherent oscillation of Sulawesi Sea basin is one of the important mechanisms that contribute to its intra-seasonal variation.
- Sulawesi Sea,
- multi-frequency intra-seasonal variation,
- spatiotemporal characteristics,
- Rossby normal modes,
- inherent oscillation

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References(47)

References

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