Electronic Theses and Dissertation

Arus laut permukaan merupakan salah satu komponen penting dinamika oseanografi yang dipengaruhi oleh berbagai faktor, termasuk fenomena iklim regional seperti Indian Ocean Dipole (IOD). Penelitian ini bertujuan untuk menganalisis klimatologi arus permukaan laut di perairan Aceh dalam konteks perubahan iklim pada periode 2001 hingga 2020 dengan fokus utama pada hubungan arus laut terhadap fenomena Indian Ocean Dipole (IOD). Data arus permukaan laut diperoleh dari produk Global Ocean Physics Reanalysis (GLORYS12V1) Copernicus Marine Environment Monitoring Service (CMEMS) dengan resolusi spasial ~9 km, sementara data indeks IOD diperoleh dari National Oceanic and Atmospheric Administration (NOAA) Physical Sciences Laboratory (PSL). Analisis dilakukan terhadap pola arus permukaan pada bulan Februari dan Agustus selama periode 2001–2020, termasuk pembandingan arus pada fase IOD positif, negatif, dan netral. Hasil penelitian menunjukkan bahwa arus laut pada bulan Februari didominasi oleh pergerakan dari timur ke barat dengan kecepatan rata-rata 0,171 m/s, sedangkan pada bulan Agustus ke arah yang sama namun dengan kecepatan lebih rendah, yakni 0,134 m/s. Pada fase IOD negatif, arus cenderung lebih kuat, terarah, dan stabil. Sebaliknya, saat IOD positif, arus melemah dan membentuk pola yang menyebar atau tidak terfokus. Pola ini menunjukkan bahwa variabilitas IOD berpengaruh signifikan terhadap kekuatan dan arah arus laut di perairan Aceh. Temuan ini menegaskan pentingnya pemahaman dinamika arus laut dalam kaitannya dengan anomali iklim untuk mendukung pengelolaan pesisir dan sumber daya kelautan secara berkelanjutan.

Kata kunci: Arus laut permukaan, Indian Ocean Dipole, perubahan iklim, perairan Aceh, CMEMS

Surface ocean currents are an important component of oceanographic dynamics influenced by various factors, including regional climate phenomena such as the Indian Ocean Dipole (IOD). This study aims to analyze the climatology of surface ocean currents in the waters of Aceh in the context of climate change during the period 2001 to 2020, with a primary focus on the relationship between ocean currents and the Indian Ocean Dipole (IOD) phenomenon. Surface ocean current data were obtained from the Global Ocean Physics Reanalysis (GLORYS12V1) product of the Copernicus Marine Environment Monitoring Service (CMEMS) with a spatial resolution of ~9 km, while IOD index data were obtained from the National Oceanic and Atmospheric Administration (NOAA) Physical Sciences Laboratory (PSL). The analysis examined surface current patterns in February and August during the 2001–2020 period, including comparisons of currents during positive, negative, and neutral IOD phases. The results of the study show that ocean currents in February are dominated by east-to-west movements with an average speed of 0.171 m/s, while in August they move in the same direction but at a lower speed of 0.134 m/s. During the negative IOD phase, currents tend to be stronger, more directional, and more stable. Conversely, during the positive IOD phase, currents weaken and form a dispersed or unfocused pattern. This pattern indicates that IOD variability significantly influences the strength and direction of ocean currents in Aceh waters. These findings underscore the importance of understanding ocean current dynamics in relation to climate anomalies to support sustainable coastal and marine resource management. Keyword: Surface ocean current, Indian Ocean Dipole, climate change, waters of Aceh, CMEMS