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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis ILMU KELAUTAN: Indonesian Journal of Marine Sciences Journal of Oceanography NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Jurnal Kelautan Nasional Jurnal Chart Datum Indonesian Journal of Earth Sciences Indonesian Journal of Oceanography Jurnal Mandiri IT International Journal of Humanities Education and Social Sciences Formosa Journal of Science and Technology (FJST) Jurnal Hidrografi Indonesia Journal of Fisheries & Marine
Gentio Harsono
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Mathematics Social Sciences Other

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Journal : Journal of Fisheries

 1 
Oceanographic Characteristics in the Three International Indonesian Archipelago Sea Lanes (IASLs) Region: Implications for Underwater Acoustics System Putra, I Wayan Sumardana Eka; Atmadipoera, Agus Saleh; Manik, Henry Munandar; Harsono, Gentio; Purwandana , Adi
Jurnal Ilmiah Perikanan dan Kelautan Vol. 17 No. 2 (2025): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v17i2.56045

Abstract

Graphical Abstract Highlight Research The IASL-1 entry portal in the southern and northern regions shows the emergent SOFAR channels. The shadow zone and the existence of a SOFAR deep sound channel in the IASL-2 and IASL-3 routes can be triggered by the emergent “saddle” SVP pattern.  The variability seasonally and interannually due to variations in seawater properties stratification plays an important role in SOFAR channel appearances in IASLs. The diverse oceanographic characteristics of IASLs necessitate the implementation of sustainable marine geospatial data. Abstract Indonesian Maritime Continent (IMC) is responsible for the three international sea lanes, known as Indonesian Archipelago Sea Lanes (IASLs), which allowed ships to navigate across territorial waters between Pacific and Indian Oceans and vice versa. Gaining knowledge about the distinct oceanographic characteristics of the three IASLs can offer valuable insight into maritime safety and sustainable marine resource management. Therefore, this research aims to review oceanographic characteristics in IASLs regions from available previous research to provide a comprehensive insight into the processes and dynamical oceanography in IASLs region as well as determine the implications for underwater acoustic patterns. The results showed that IASL-1 route is characterized by a shallow shelf passage with homogeneous sound velocity profile (SVP), which has a deep and narrow entry portal in the southern and northern Sound Fixing and Ranging Channel (SOFAR) channels. Seasonal reversal monsoonal wind-driven current dominates the circulation. IASL-2 and IASL-3 routes transported a deep and narrow passage with complexity of seaair interactions that vary on seasonal and interannual time scales. These IASLs were established with the saddle SVP, which trigger the shadow zone and the existence of SOFAR deep sound channel with seasonal and interannual variations in seawater properties stratification. The diverse oceanographic characteristics discussed significantly influence the underwater object detection equipment, the planning time, and the strategies for underwater defense systems. Due to the implications, it is necessary to use marine geospatial database, which may be adopted to facilitate policy-making, providing approximations for marine activities and management along IASLs.
Water Mass and Indirect Estimation of Turbulent Mixing Based on Observational CTD Yoyo Data in Flores Sea Waters, Indonesia Harsono, Gentio; Yuliardi, Amir Yarkhasy; Wirasatriya , Anindya; Purwanto, Budi; Cabral, Mario
Jurnal Ilmiah Perikanan dan Kelautan Vol. 17 No. 2 (2025): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v17i2.70809

Abstract

Graphical Abstract   Highlight Research Three distinct water layers were identified: surface (0-50 m), thermocline (50-180 m), and deep (>180 m). The thermocline layer is the most stable, with high Brunt-Väisälä frequency and low Thorpe displacement values. The highest energy dissipation rates were observed in the thermocline layer. Vertical diffusivity values were highest in the thermocline layer and decreased with depth.     Abstract The Flores Sea is on the western ITF trajectory connecting the Pacific and Indian oceans. Identification and quantification of turbulent mixing of water masses in the Flores Sea are essential for analyzing large-scale ocean circulation processes, including the circulation of the Indonesian ocean interior. However, direct estimations of turbulent mixing in the Flores Sea as a part of the ITF are underestimated. This research aims to determine water conditions, stratification, and water mass structures. This research used data obtained from the CTD instrument applying a Yoyo casting method deployed in March − April 2023. On the other hand, the Thorpe method was used to estimate turbulent vertical mixing based on the values ​​of energy dissipation and vertical diffusivity. The waters are stratified into three layers, mixed layer (1−50 m), thermocline layer (50−180 m), and deep layer (180−500 m). The CTD data showed the presence of a stable thermocline layer dominated by ITF water masses carrying water masses from the Pacific Ocean (North Pacific Intermediate Water (NPIW) and North Pacific Subtropical Water (NPSW)) from the western ITF path. The energy dissipation value obtained at the study site was about 3.36E-07 W Kg-1 and the vertical diffusivity value was approximately 5.25E-05 m2s-1. The thermocline layer showed a large energy dissipation value which was strongly associated with the friction of the ITF, suggesting that turbulent mixing in this region is primarily driven by the interaction of ITF water masses with the surrounding environment.
Co-Authors Adi Purwandana Adrianto, Dian Agus Atmadipoera Akbar, Harun I. Alfany, Dini Amir Yarkhasy Yuliardi Amron Amron, Amron Anatansyah Ayomi Anandari Anggriawan Maydwika, Dhedy Anindya Wirasatriya Arif Maulana, Arif ARIS PONIMAN Budi Purwanto Budi Sukoco, Nawanto Cabral, Mario Dharma, Candrasa Surya Fatoni, Khoirul Imam Firdaus, Randi Gultom, Feri Gultom, Rudy A.G. Haloho, Luwis Surani Hari Priyadi Hascaryo, Anom Puji Henry Munandar Manik Heryoso Setiyono Heryoso Setyono Hudayat, Nurul Junaedi, Liva Kamija2, Kamija Khoirun Nisa KHOIRUN NISA Kunarso Kunarso Kurnia Darmawan, Lalu Kusmantoro, Yeri Lena Sumargana Lutfi Fitriano, Lutfi Mahardhika, Theodorus Karel Elang Malik, Kurnia Namira F.N., Riva Nugroho, Giant Patrick W., Fressan Pianto, Teguh A. Purwandana , Adi Puspitasari, Dyah C. Putra, I Wayan Sumardana Eka Putra, Iska Raden Bima Yoga B Rafii, Akhmad Rizqi Ayu Farihah, Rizqi Ayu Rudiastuti, Aninda W. Sadewa, Annisa Harum Saputra, Chairil Amin Setyo Pranowo , Widodo Sobar Sutisna Sry Mutia, Andike Sudiarso, Aries Sugama, Agus Y. Sugianto, Deni N. Sukendra Martha Susilo, Ahmad Fa’iq Indra Sutejo, Bayu Suweni, Imanuel Trismadi Trismadi, Trismadi Utama, Alifka F. Wadjdi, Achmad Farid Waluyo, Dangan Wangdiarta, Fressan Patrick Widodo S Pranowo Widya, Kartika Wirasatriya , Anindya Wirasatya, Anindya Wiwin Ambarwulan Yosef Prihanto, Yosef Yuniarti Yuniarti Yuswantari, Truly