Influence of SCSTF on ITF based on numerical sensitivity experiments of salinity relaxation scheme

CAI Zhongrui; WEI Zexun; HE Zhiwei; WANG Dingqi; XU Tengfei

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CAI Zhongrui，WEI Zexun，HE Zhiwei, et al. Influence of SCSTF on ITF based on numerical sensitivity experiments of salinity relaxation scheme[J]. Haiyang Xuebao，2025, 47(x)：1–19

Citation:

CAI Zhongrui，WEI Zexun，HE Zhiwei, et al. Influence of SCSTF on ITF based on numerical sensitivity experiments of salinity relaxation scheme[J]. Haiyang Xuebao，2025, 47(x)：1–19

Citation:

CAI Zhongrui，WEI Zexun，HE Zhiwei, et al. Influence of SCSTF on ITF based on numerical sensitivity experiments of salinity relaxation scheme[J]. Haiyang Xuebao，2025, 47(x)：1–19

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Influence of SCSTF on ITF based on numerical sensitivity experiments of salinity relaxation scheme

1.
Nanjing University, Nanjing 210046, China
2.
First Institute of Oceanography, Qingdao 266061, China
3.
Qingdao Institute of Marine Meteorology, Qingdao 266000, China

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Corresponding author: Email: xutengfei@fio.org.cn
Received Date: 2025-02-15
Rev Recd Date: 2025-05-06

Available Online: 2025-06-03

Abstract

Abstract

Observations indicate that the substantial freshwater transported to the southern part of the Makassar Strait by the South China Sea Throughflow (SCSTF) can influence the Indonesian Throughflow (ITF) via the “Freshwater Plug” effect. This article has conducted a series of numerical experiments and discovered that when the salinity in the Karimata Strait increased to that in the Makassar Strait, the volume and freshwater transport through the Karimata Strait are 3.52 Sv and 184.03 mSv, with an increase of 4.31% and a decrease of 27.27% compared with the control experiment, respectively. In the meantime, the volume transport in the upper 50m of the Makassar Strait is 0.11 Sv, with an increase of 34.69%. When the salinity in the Karimata Strait decreased by 0.1−0.6 psu, the volume and freshwater transport through the Karimata Strait are 3.37 Sv and 294.44 mSv, with a decrease of 1.57% and an increase of 16.37% compared with the control experiment, respectively. Also, the volume transport in the upper 50m of the Makassar Strait is 0.07 Sv, with a decrease of 34.69%. These have proved the influence of freshwater transported by SCSTF on ITF. Comparing the salinity relaxation experiment with the topography closed experiment, the salinity relaxation experiment allows for significant changes in the freshwater transport through the Karimata Strait while only modestly affecting the volume transport. This enables an analysis of the impact of SCSTF’s surface water with low salinity on ITF. Meanwhile, we have compared the salinity relaxation experiment with the rainfall closed experiment, and the important impact of low salinity water transport in the South China Sea through the Karimata Strait to the Java Sea on the ITF in boreal winter is further verified.
- ocean numerical models,
- sensitivity experiments,
- salinity relaxation experiments,
- South China Sea Throughflow,
- Indonesian Throughflow

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References(43)

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