Analysis of turbulent mixing in Dewakang Sill, Southern Makassar Strait

3rd International Symposium on LAPAN-IPB Satellite For Food Security and Environmental Monitoring 2016

地球科学;轻工业;生态环境科学

Risko^1 ; Atmadipoera, A.S.^2 ; Jaya, I.^2 ; Sudjono, E.H.^3

Graduate Program in Marine Science, Bogor Agricultural University, Indonesia^1

Marine Science and Technology Dept., Bogor Agricultural University, Indonesia^2

Marine Geological Institute, Bandung, Indonesia^3

关键词: Indonesian throughflow;    Intermediate waters;    Internal tidal waves;    Internal waves;    Subtropical thermoclines;    Turbulent kinetic energy;    Turbulent mixing;    Vertical diffusivity;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/54/1/012086/pdf
DOI  :  10.1088/1755-1315/54/1/012086

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Dewakang Sill is located in southern Makassar Strait, conveying major path of Indonesian Throughflow (ITF), as a confluence region of different water masses, such as salty Pacific water and fresh Java Sea water. Its depth is about 680 m which blocks the ITF flow below this depth into Flores Sea. This research aimed to estimate turbulent mixing in the Dewakang Sill by applying Thorpe analysis using 24 hours "yoyo" CTD data sets, acquired from MAJAFLOX Cruise in August 2015. The results showed that stratification of water masses is dominated by Pacific water origin. Those are North Pacific Subtropical thermocline and Intermediate water masses. Mean dissipation of turbulent kinetic energy () and turbulent vertical diffusivity (Kρ) value in the Dewakang Sill are of O(1.08 × 10-6)Wkg-1, and O(2.84 × 10-4) m2s-1respectively. High correlation between epsilon and internal waves oscillation suggested that internal tidal waves activities are the major forcing for turbulent mixing in the study area.