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On the interaction between the nonlinear internal waves and the Pearl River plume
Wei-Teh Li1,2, Ke-Hsien Fu3, I-Huan Lee4,5
1Department of Oceanography, National Sun Yat-Sen University, No. 70, Lien-hai Rd., Kaohsiung, 804201, Taiwan.
Scientific Reports
|December 1, 2025
Summary
River discharge significantly intensifies nonlinear internal waves (NIWs) in the South China Sea. This study reveals how Pearl River flux creates conditions favoring NIW propagation, with implications for coastal impacts due to climate change.
Area of Science:
- Oceanography
- Environmental Science
Background:
- Nonlinear internal waves (NIWs) are a significant oceanic phenomenon.
- Environmental variability can influence NIW activity.
Purpose of the Study:
- Investigate factors influencing the short-term intensification of NIWs.
- Analyze the impact of river flux and other environmental factors on NIW dynamics.
Main Methods:
- Analysis of oceanic and atmospheric datasets.
- Examination of temperature fluctuations and stratification.
- Calculation of buoyancy frequency squared (N²).
Main Results:
- Observed large daily temperature fluctuations (10-14°C) at 80-100m depth, intensifying after spring tides.
- Identified advection of low-salinity Pearl River water enhancing stratification.
- Found conditions favorable for westward NIW propagation.
Conclusions:
- River flux plays a critical role in NIW dynamics by enhancing stratification and creating propagation pathways.
- Increased extreme precipitation events may lead to more frequent NIWs reaching the southeastern mainland coast.
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