VERTICAL SRUCTURE AND VARIABILITY OF INDONESIAN THROUGHFLOW (ITF) IN TO WESTERN BANDA SEA
| Main Authors: | Giu, La Ode M. Gunawan, Atmadipoera, Agus S. , Naulita, Yuli , Nugroho, Dwiyoga |
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| Format: | Article info application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University
, 2020
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| Subjects: | |
| Online Access: |
http://journal.ipb.ac.id/index.php/jurnalikt/article/view/29142 http://journal.ipb.ac.id/index.php/jurnalikt/article/view/29142/20399 |
Daftar Isi:
- Arus Lintas Indonesia (Arlindo) merupakan sistem arus antara samudera Pasifik dan Hindia yang melewati Laut Indonesia, seperti melalui jalur primer Selat Makassar ke Laut Flores dan melalui jalur sekunder Selat Lifamatola ke Laut Banda. Penelitian ini bertujuan untuk mengkaji struktur vertikal dan variabilitas Arlindo di Laut Flores Timur (Flores) dan Laut Banda Utara (Banda) yang berasal dari keluaran model laut INDESO antara tahun 2008 dan 2014. Analisis struktur Arlindo dengan menghitung rataan komponen arus secara vertikal. Volume transpor dihitung dari penampang di Laut Banda dan Laut Flores. Deret waktu Arlindo dianalisis variabilitasnya menggunakan filter band-pass dan transformasi wavelet kontinu. Hasil penelitian menunjukkan bahwa Arlindo Banda secara dominan mengalir ke selatan, sedangkan Arlindo Flores mengalir ke timur di sepanjang utara Kepulauan Nusa Tenggara. Struktur vertikal aliran Arlindo mengalami penguatan di kedalaman antara 50 m dan 150 m. Perkiraan total volume transpor selama periode 7 tahun dari kedua jalur Arlindo yang masuk ke Laut Banda bagian barat sebesar 6,27 Sv (±3,81 Sv), yang merupakan kesepakatan baik dengan studi model sebelumnya. Variasi tahunan transpor Arlindo Banda (Flores) maksimum selama musim Barat Laut (Tenggara) dan minimum selama musim Tenggara (Barat Laut). Variabilitas yang mendominasi pada transpor Arlindo Banda ialah periode intra-musiman (ISV) dan semi-tahunan (SAV), sedangkan variabilitas transpor Arlindo Flores didominasi oleh periode tahunan (AV).
- The Indonesian Throughflow (ITF) is an inter-ocean Pacific-Indian current system that passes Indonesian Seas, such as via the primary path of Makassar Strait to Flores Sea and via the secondary path of Lifamatola Strait to Banda Sea. This study aims to investigate the structure and volume transport estimate of ITF Eastern Flores Sea (Flores) and Northern Banda Sea (Banda) derived from ocean model output of INDESO between 2008 and 2014. Structure of the ITF is analyzied by the average of current component vertically and transport volume estimated by cross-section at Banda and Flores sea. Time-series variability of ITF is analyzed using band-pass filter and continuous wavelet transforms. The results showed that ITF Banda was characterized by flow dominantly towards south while ITF Flores depicted was flowing east along the North of Nusa Tenggara Islands. The vertical structure of ITF flow is intensified at a depth between 50 m and 150 m. The total volume transport estimate over the 7-year period from both ITF paths into the western Banda Sea is about 6.27 Sv (±3.81 Sv), which is a good agreement with previous model studies. Variations of transports ITF in Banda (Flores) is maximum during northwest (southeast) monsoon and minimum during southeast (northwest) monsoon. The variability of the ITF Banda is dominated intra-seasonal (ISV) and semi-annual periods (SAV), while the ITF Flores is annual period (AV).