3D structure and seasonal variation of temperature fronts in the shelf sea west of Guangdong

Tan Keyi; Xie Lingling; Li Mingming; Li Min; Li Junyi

doi:10.12284/hyxb2023053

Volume 45 Issue 10

Oct. 2023

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Tan Keyi，Xie Lingling，Li Mingming, et al. 3D structure and seasonal variation of temperature fronts in the shelf sea west of Guangdong[J]. Haiyang Xuebao，2023, 45(10)：42–55 doi: 10.12284/hyxb2023053

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3D structure and seasonal variation of temperature fronts in the shelf sea west of Guangdong

doi: 10.12284/hyxb2023053

Tan Keyi^{1, 2},
Xie Lingling^{1, 2, 3},
Li Mingming^{1, 2, 3
,
,},
Li Min^{1, 2, 3},
Li Junyi^{1, 2, 3}

1.
Laboratory of Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
2.
Key Laboratory of Climate, Resources and Environment in Continental Shelf Sea and Deep Ocean, Zhanjiang 524088, China
3.
Key Laboratory of Space Ocean Remote Sensing and Application, Ministry of Natural Resources, Beijing 100081, China

Received Date: 2022-09-29
Rev Recd Date: 2022-12-20

Available Online: 2023-11-09

Publish Date: 2023-10-30

Abstract

Abstract

Using reanalysis sea surface data and in-situ high-resolution observations in spring, summer 2018, and summer 2019, this study analyzes the 3D structure and seasonal variation of temperature fronts in the shelf sea west of Guangdong. The results show that the sea surface temperature (SST) fronts reach the strongest intensity up to 0.049°C/km in winter, with the largest occurrence probability of 75% and coverage of 66 km. The SST fronts weaken in spring and summer, and almost disappear in autumn. The average offshore distance of the front is 50 km in winter and 23.1 km in summer. The in-situ observations show a strong thermal front in coastal areas shallower than 20 m in both spring and summer. The front gets weaker and closer to the coast in deeper layers and is associated with warm coastal water and cold shelf water. In shelf areas deeper than 20 m, the fronts in the subsurface layer are stronger than in the surface layer and shift shoreward in deeper layers. The correlation coefficient and information flow between the surface wind and frontal parameters reveal that the surface wind stress curl and along-coast wind are the most important factors affecting the surface thermal front. These thermal fronts also have interannual variations, with maximum intensity in La Niña years with negative PDO and minimum intensity in El Niño years with positive PDO.
- ocean front,
- seasonal variation,
- 3D structure,
- information flow,
- shelf west of Guangdong

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References(52)

References

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