期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 127, 期 7, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022JC018518
关键词
sea surface salinity; seasonal cycle; low-salinity intrusion; salt budget; Angola Current; Angolan coast
类别
资金
- TRIATLAS European project (South and Tropical Atlantic climate-based marine ecosystem prediction for sustainable management
- H2020) - Nansen Tutu Center for Marine Environmental Research, Department of Oceanography, University of Cape Town, Cape Town, Sout [817578]
- NRF Sarchi Chair on Ocean Atmosphere Modeling
- Research Council of Norway PCO2 [309347]
- Belmont Forum CRA Transdisciplinary Research for Ocean Sustainability (Ocean 2018), EXEBUS: Ecological and Econmic impacts of the intensification of extreme events in the Benguela Upwelling System
The seasonal cycle of sea surface salinity (SSS) along the Angolan coast was investigated, and the model was able to reproduce the main characteristics of the seasonal cycle. The study found that the meridional advection of surface water, the vertical advection of subsurface water, and mixing at the base of the mixed layer control the semi-annual cycle of SSS.
The seasonal cycle of sea surface salinity (SSS) along the Angolan coast is investigated using observations and a regional ocean model. The model reproduces the main characteristic of the seasonal cycle of SSS along the Angolan coast, such as the freshwater discharge signature off the Congo River plume and the low-salinity observed in February/March and October/November along the Angolan coast. The model also reproduces the two maxima of salinity in June/July and December/January. The analysis of the model salt budget reveals that the semi-annual cycle of SSS is controlled by the meridional advection of surface water, the vertical advection of subsurface water, and the mixing at the base of the mixed layer. The meridional advection is controlled by the Angola Current which brings low-salinity water from offshore region of the Congolese coast toward the south Angolan coast in February/March and October/November. The vertical advection contribution is modulated by the vertical stratification of salinity and not by vertical velocities which peak during the main Angolan upwelling season. The vertical stratification is due to the low-salinity intrusion at the Angolan coast that creates a strong vertical salinity gradient with low-salinity at the surface and high salinity at the subsurface.
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