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Abstrak :
A numerical ocean modeling study using spectral element method is used to simulate the Indian Ocean Kelvin wave propagation along the Makassar Strait and the Sulawesi Sea by giving a-prescribed-50-day Kelvin wave forcing in the northern mouth of the Lombok Strait. The least square fit analysis is employed to extract a-50-day-resonant signal from the interface height data simulation. The results indicate that the 50-day Kelvin wave propagates northward along the Makassar Strait. One part of this wave turns back at the Labani channel and makes southward propagation along the eastern coast of the Makassar Strait. The rest part is going further to enter the Sulawesi Sea and makes 50-day resonance within the basin. This finding will have important implication on the intra-seasonal time scale variability of the Indonesian throughflow transport entering the Indonesian Seas and needs further investigation as well as comparison with observational data.

Abstrak :
SURVEI KELAUTAN DI PERAIRAN SAMUDERA HINDIA SELATAN JAWA BARAT (PERAIRAN SELAT PANAITAN SELATAN). Telah dilakukan survei kelautan yang berhubungan dengan dispersi radionuklida di perairan laut Samudera Hindia. Penilitian dilakukan dengan cara mengambil sampel air laut untuk mengetahui konsentrasi 137Cs dan melakukan pengukuran CTD. Untuk mengetahui kondisi fisis oseanografi daerah penelitian, maka dilakukan pengambilan data temperatur, salinitas, dan densitas secara vertikal dengan menggunakan CTD di tiga titik pemantauan. Data hasil rekaman CTD dapat digunakan sebagai bahan untuk menganalisis pola arus yang terjadi di lokasi penelitian. Menggunakan software Ocean Data View (ODV), data CTD diolah dan ditampilkan dalam bentuk grafik terhadap kedalaman. Konsentrasi 137Cs di perairan Selat Panaitan – Selatan Garut dengan kisaran 0,14 – 0,30 mBq/L. Konsentrasi tersebut belum mengindikasikan dampak kecelakaan Fukushima walaupun pola arus global mampu mentranspor 137Cs dari sumber (Fukushima) ke perarain Indonesia. Arus yang berada di Samudera Pasifik masuk ke perairan Indonesia melalui sistem ARLINDO. Nilai konsentrasi terendah dan tertinggi terjadi karena perbedaan jarak stasiun penelitian dengan ARLINDO. Kata kunci: survei, samudra hindia, 137Cs ABSTRACT SURVEY OF MARINE IN SOUTH INDIAN OCEAN – EAST JAVA (STRAIT OF SOUTH PANAITAN). Marine surveys have been conducted relating to the dispersion of radionuclides in the marine waters of the Indian Ocean. The studies conducted by taking a sample of sea water to determine the concentration of 137Cs and CTD measurements. To determine the physical oceanographic conditions of the study area, then the data collection of temperature, salinity and density vertically using the CTD in three monitoring points have been performanced. CTD data recording can be used as material for analyzing the flow patterns that occur in the study site . Using the software Ocean Data View ( ODV ), CTD Data processed and displayed in graphical form on the depth . The concentration of 137Cs in Panaitan Strait - South Garut with a range of 0.14 to 0.30 mBq/L. This concentration of 137Cs has not indicated the impact the Fukushima accident although the global flow pattern although capable of transporting 137Cs source (Fukushima ) to Indonesia marine waters. The current of the Pacific Ocean waters can enter Indonesia through Arlindo system. Value of the lowest and highest concentrations occur due to differences in the distance with Arlindo research station . Keywords: Survey, Indian Ocean, 137Cs

Abstrak :
Mode Kopel Laut-Atmosfer di Daerah Tropis Samudera Hindia selama Tahun 2011. Mode kopel laut-atmosfer di kawasan tropis Samudera Hindia yang dikenal sebagai fenomena Indian Ocean Dipole (IOD) terjadi pada musim panas hingga musim gugur tahun 2011. Pada studi ini, data observasi satelit, data reanalisis, dan data dari hasil pengukuran arus laut digunakan untuk mengevaluasi terjadinya fenomena IOD di tahun 2011. Hasil studi menunjukkan bahwa fenomena IOD tahun 2011 merupakan jenis IOD yang lemah dan berdurasi pendek. IOD di tahun 2011 mulai terbentuk di bulan Juli, mencapai puncaknya di bulan September, meluruh di bulan Oktober dan menghilang di bulan November. Pada saat fase puncak, anomali suhu permukaan laut di dekat pantai Sumatera-Jawa mencapai -1,2 °C. Data observasi arus di tengah dan di sisi timur ekuator Samudera Hindia menunjukkan adanya respon laut terhadap anomali sirkulasi atmosfer. Hasil pengukuran menunjukkan bahwa arus zona bergerak ke arah barat sebagai respon terhadap angin timuran pada fase puncak IOD tahun 2011.

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Coupled ocean-atmosphere mode in the tropical Indian Ocean, so-called the Indian Ocean Dipole (IOD), occurred during boreal summer to fall 2011. In this study, data from satellite observations and atmospheric reanalysis datasets together with data from ocean current mooring were used to evaluate the evolution of the 2011 IOD event. It is shown that the 2011 IOD was a weak and short-lived event. It developed in July, peaked in September, decayed in October and terminated in November. During the peak phase, maximum negative sea surface temperature anomaly off Sumatera- Java reached -1.2 °C. As oceanic response to easterly wind anomalies along the equator, the observed zonal currents in the central and eastern equatorial Indian Ocean also showed prominent westward currents during the peak phase of the 2011 IOD event.