Update Artikelilmiah: 51906

MUHAMMAD ICHSANUDDIN WAFA

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Abstrak (Bhs. Indonesia)

Indonesia memiliki perairan yang strategis karena berada pada jalur global thermohaline circulation, sehingga berperan penting dalam pertukaran massa air antara Samudra Pasifik dan Samudra Hindia. Penelitian ini bertujuan untuk menganalisis distribusi spasial dan vertikal suhu, salinitas, dan densitas, mengidentifikasi lapisan tercampur, termoklin, dan lapisan dalam, serta menentukan karakteristik massa air di perairan Selat Bali, Selat Lombok, dan Selat Alas. Data profil vertikal diperoleh menggunakan instrumen CTD SBE 19 Plus V2 pada sembilan stasiun pengamatan selama ekspedisi MarExplore 2025. Analisis data dilakukan secara deskriptif kuantitatif menggunakan perangkat lunak SBE Data Processing yang diintegrasikan dengan komputasi berbasis python. Penentuan lapisan perairan dilakukan melalui pendekatan metode ambang batas (threshold) dan gradien, sedangkan karakteristik massa air diidentifikasi berdasarkan referensi klasifikasi massa air regional yang telah ada. Hasil menunjukkan suhu permukaan berkisar ±29–30°C yang menurun hingga ±5°C pada kedalaman >600 m, diikuti peningkatan salinitas dari 30,9–32,5 PSU menjadi 34,5–34,6 PSU dan densitas hingga ±1032 kg/m³. Struktur kolom perairan memperlihatkan lapisan tercampur dangkal di Selat Bali, lapisan tercampur dan termoklin terdalam serta stabilitas tertinggi di Selat Lombok, dan karakter transisi di Selat Alas. Analisis diagram T–S mengidentifikasi enam massa air utama, yaitu Java Sea Water (JSW), Indonesian Upper Water (IUW), North Pacific Intermediate Water (NPIW), South Pacific Intermediate Water (SPIW), Banda Intermediate Water (BIW), dan Australian Mediterranean Water (AAMW), yang menunjukkan peran penting jalur Arus Lintas Indonesia dalam pembentukan struktur dan pencampuran massa air regional.

Abtrak (Bhs. Inggris)

Indonesia has strategically important waters as they lie along the pathway of the global thermohaline circulation, playing a key role in the exchange of water masses between the Pacific and Indian Oceans. This study aimed to analyse the spatial and vertical distribution of temperature, salinity, and density, identify the mixed layer, thermocline, and deep layer structures, and determine water mass characteristics in the Bali Strait, Lombok Strait, and Alas Strait. Vertical profile data were acquired using a CTD SBE 19 Plus V2 instrument at nine observation stations during the MarExplore 2025 expedition. Data analysis was performed using a quantitative descriptive approach via SBE Data Processing software integrated with python-based computing. Water column stratification was determined using threshold and gradient methods, while water mass characteristics were identified based on existing regional water mass classifications. The results showed surface temperatures of approximately 29–30 °C, which decreased to about 5°C at depths greater than 600 m, accompanied by an increase in salinity from 30.9–32.5 PSU to 34.5–34.6 PSU and density up to approximately 1032 kg/m³. The water column structure is characterized by a shallow mixed layer in the Bali Strait, the deepest mixed layer and thermocline with the highest stability in the Lombok Strait, and transitional characteristics in the Alas Strait. T–S diagram analysis identified six main water masses: Java Sea Water (JSW), Indonesian Upper Water (IUW), North Pacific Intermediate Water (NPIW), South Pacific Intermediate Water (SPIW), Banda Intermediate Water (BIW), and Australian Mediterranean Water (AAMW), highlighting the important role of the Indonesian Throughflow in shaping regional water mass structure and mixing.

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