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Budi Purwanto
Sriwijaya University
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Journal : Journal of Fisheries

 1 
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 A.N, Shafira A.W, Rose Abdul Kohar Irwanto Adriyanto, Agus Agus Gunawan Agus Supriadi Agustinus Agustinus Ahsin, Awaludin Akhmad Tri Prasetyo Amir Yarkhasy Yuliardi Amperanoto, Agus Anggi Angga Resti Apriyanto, I Nengah Putra Ardhanarespati, Panji Arief Sabdo Yuwono Arief, Riana Aryani Arisanti, Ivon Askunala Wikan, Preti Aswandi . Aulia Andi Mustika Ayuning Atmasari, Ayuning Ayuningtyas Palupi, Risqi Ekanti Azzahra, Annisa Afni Budi Prasetyo Cabral, Mario Daniel Dewantoro Rumani Daradjat, Hanan Dasryanto, Dasryanto Dinar, Tagrid Dwilingga Ramdaniar, Boya Dzikrina Fikrotus Salma E, Wita Juwita Eka Maya Kurniasih, Eka Maya Ekanti Palupi, Risqi Eko Ruddy Cahyadi Eko Widodo Fauzan Heru Santhoso Febrita, Joana Fifi Gus Dwiyanti Fikrotus Salma, Dzikrina Firdaus, Randi Gentio Harsono Gian Pertela H. Harianja, Alfonsus Hermialingga, Septi Heryoso Setiyono Hidayat, M. Yusup Hudaya, Aang IBNUL QAYIM IPB, BPKB Irwanto, Bambang Jamaludin, Ali Jatihusudo, Ahmad Rafiq Juniartha, Muhammad Iqbal KINANTHI, RESTI Kunarso Kunarso Kusumaningrum Fadhilah, Nurhidayah L.P, Lolita Malik, Kurnia Marbun, Firdaus Marfiah, Yulis Widyo Marvianto, Ramadhan Dwi Matturungan, Nur Hasbullah Ma’mur, Ilzamuddin Meti Ekayani Muhammad Hendri Mulyadi, Wahyu Mulyatmojo, Ariyanto Musa Hubeis Muslim Muslim Naipospos, Tri Satya Putri Nanda Karunia Amanah Nunung Nuryartono Nurbiyanti, Nofita Nurhidayat Nurhidayat Nurmaya, Acintya Pambudianti, Feronica Fa Rozalyne Pandi Pandi, Pandi Patriadi, Andi Patrick W., Fressan Pongoh, Hentje Pranoto Suryo Herbanu Prima Respati Putra, Heriansyah Rachmawati, Annisa Devi Rafi, Salahudin Rai Sita Respati, Prima Riawati, Danik ridwan fauzi Rifnadhi, Bayu Rijaluddin, Rijaluddin Rina Mardiana Rindang Matoati, Rindang Rukmana, Adi Sani, Rianna Anwar Sarfilianty Anggiani, Sarfilianty Sari, Windi Mayang Sitepu, Samsudin Sobaruddin, Dyan Primana Speksnijder, David Suandy, Imron Sunandar Supriyanto, Taufiq Suyoso, - Tubagus Nur Ahmad Maulana Utami, Annisa Dwi Viana, Eka Dasra Wagenaar, Jaap Wahyudi . Wahyudi Wahyudi Wahyuni, Dina Puji Wahyuono, Titis Widodo S Pranowo Wirasatriya , Anindya Witama, R. Onig Wulandari Wulandari yuliningtyas, priyantika Yunita Cucikodana Zaenal Abidin Zahir Syah, Zahir