VARIABILITAS KLOROFIL-a PERIODE INDIAN OCEAN DIPOLE DI SELAT BALI BERDASARKAN ANALISIS EMPIRICAL ORTHOGONAL FUNCTION

Adi Wijaya, Umi Zakiyah, Abu Bakar Sambah, Daduk Setyohadi
  JFMR, pp. 208-216  

Abstract


Perairan Selat Bali secara tidak langsung dipengaruhi oleh peristiwa yang terjadi di Samudera Hindia Selatan Jawa. Variabilitas musim dan antar-tahunan dari konsentrasi klorofil-a permukaan (SSC) di Selat Bali, berhubungan erat dengan periode Indian ocean dipole (IOD) dan upwelling kuat yang terjadi di sepanjang Pantai Selatan Jawa. Penelitian ini bertujuan untuk menganalisis variabilitas musiman dan antar-tahunan secara spasial dan temporal dari klorofil-a periode IOD di Selat Bali. Data oseanografi diperoleh dari Satelit Aqua/Terra MODIS (Moderate Resolution Imaging Spectroradiometer) level 2 harian, selama periode Maret 2000-Mei 2020, dan analisis data menggunakan Empirical Orthogonal Function (EOF). Analisis EOF dilakukan pada data harian yang dikomposit menjadi bulanan dan dinormalisasi untuk mengisi data kosong. Hasil analisis EOF variasi temporal yang koheren dalam pemompaan klorofil-a di Selat Bali. Deret waktu dari mode pertama yang terbentuk mengungkapkan variasi musiman yang kuat dan variasi antar-tahunan yang relatif lemah. Mode kedua menunjukkan variasi antar-tahunan yang berbeda dengan klorofil-a yang tinggi di sepanjang pantai Selat Bali. Klorofil-a tinggi bersama dengan suhu permukaan laut yang rendah terjadi pada saat musim tenggara. Pola musiman berdasarkan analisis EOF menunjukkan mode pertama selama puncak IOD September hingga November (SON) menunjukkan klorofil-a tinggi di pantai Selat Bali. Deret waktu dari mode EOF menunjukkan korelasi yang signifikan dengan IOD. Kondisi ini terlihat selama fase puncak periode IOD bersamaan dengan monsun tenggara konsentrasi klorofil-a meningkat di sepanjang pantai Selat Bali dibandingkan pada musim sebelumnya.

Keywords


Dipole Mode Indek; Empirical Orthogonal Function; Klorofil-a; Selat Bali; Suhu Permukaan Laut

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References


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