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- Title
Seasonal and Interannual Variability of the Subsurface Velocity Profile of the Indonesian Throughflow at Makassar Strait.
- Authors
Jiang, Guo‐Qing; Wei, Jun; Malanotte‐Rizzoli, Paola; Li, Mingting; Gordon, Arnold L.
- Abstract
Although there have been many previous studies that have interpreted the variability of Indonesian Throughflow transport, the processes that determine its vertical structure have rarely been investigated due to limited observations and model inefficiencies. In this study, a regionally coupled model is developed to address this issue. The model adopts an unstructured model grid, with an ~3‐km resolution within the Indonesian seas and straits, and reveals somewhat inconsistent results compared to previous models with coarser resolutions. The results suggest that the seasonal variability of the depth of the Indonesian Throughflow velocity maximum is partially controlled by the seasonally reversed Karimata throughflow, while the remainder primarily originated from the Mindanao–Sulawesi inflow rather than the Sibutu Strait throughflow. The Mindanao–Sulawesi inflow possesses a subsurface velocity core similar to that of the Makassar Strait, with a deep (shallow) maximum during El Niño (La Niña) years that plays a crucial role in determining the downstream Makassar throughflow profile in the interannual time scale. A sensitivity experiment by fixing Indian Ocean boundary condition shows that the impacts from the Indian Ocean might be significant only within the intraseasonal to seasonal time scales. Key Points: A high‐resolution regional coupled model is developed to investigate the Makassar throughflow profile variabilityThe seasonal variability of Makassar throughflow profile is determined by both Karimata Strait flow, Mindanao Current intrusion, and downstream Kelvin wavesIndian Ocean impact is significant within the seasonal time scale, whereas the Pacific Ocean impact is predominated in the interannual time scale
- Subjects
MAKASAR Strait (Indonesia); KARIMATA Strait (Indonesia); INDONESIA; SEASONAL variations in the ocean; VELOCITY; STRAITS
- Publication
Journal of Geophysical Research. Oceans, 2019, Vol 124, Issue 12, p9644
- ISSN
2169-9275
- Publication type
Article
- DOI
10.1029/2018JC014884