Analisis Pemodelan Arus Geostropik di Perairan Indonesia menggunakan Data Satelit Altimetri

Desi Suci Richasari, Eko Yuli Handoko

Abstract


Studi ini bertujuan  untuk menentukan dan menganalisis arus geostropik terhadap indeks ENSO dan indeks musim. Lokasi studi ini terletak di sekitar lautan Indonesia dengan koordinat 20 ° N - 20 ° S dan 90 ° E - 150 ° E. Altimetri data satelit Jason Series sangat berguna sebagai penyedia data laut global, termasuk informasi tentang arus laut permukaan dan dinamika permukaan laut. Untuk menentukan arus geostropik, kami menggunakan algoritma geostropik dan metode analisis menggunakan koefisien korelasi hasil antara parameter penelitian dengan nilai indeks. Analisis temporal dan spasial menggunakan Matlab dan ArcMap untuk memvisualisasikan parameter yang diperoleh. Hasil penelitian ini menunjukkan bahwa korelasi antara anomali permukaan laut (SLA) dengan Multivariate ENSO Index (MEI) menunjukkan nilai negatif, menunjukkan bahwa SLA memiliki kondisi yang berlawanan dengan fenomena ENSO. El Nino yang kuat terjadi pada tahun 2015 dan La Nina terjadi pada tahun 2010. Perbedaan SLA tidak mempengaruhi arah arus geostropik tetapi mempengaruhi kecepatannya. Korelasi arus geotropik komponen zonal dengan AUSMI adalah 0,720 dan WNPMI adalah 0,446. Ini berarti bahwa arus geostropik memiliki arah yang sama dengan aliran angin musim.

This research aims  to determine and analyze the geostrophic current towards the monsoon index and the ENSO index . The location of this research is around Indonesian seas with coordinates of 20 ° N - 20 ° S and 90 ° E - 150 ° E. Jason Series altimetry satellite data is very useful as a provider of data on global marine affairs, including information about sea surface and sea level currents. To determine the geostrophic current, we used the geostrophic algorithm and the method of analysis used the coefficient correlation of the results between the research parameters with the index. Temporal and spatial analysis using Matlab and ArcMap to visualize the parameters which is obtained. The results of this study indicate that  the corelation between Sea Level Anomalies (SLA) to the Multivariate ENSO Index (MEI) shows the negative value. It means that  SLA at Indonesian seas have opposite condition. The strong El Nino occurred in 2015 and La Nina occurred in 2010. The SLA difference does not affect the direction of geostrophic current but affect its velocity. The correlation of  zonal component geotrophic current to AUSMI 0,720 and WNPMI is 0,446. That means the geostrophic current have the same direction with the wind flow respectively at the moonson season.

Keywords


altimetri; arus geostropik; Indeks Monsun; Multivariate ENSO Index; sea surface height

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References


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DOI: http://dx.doi.org/10.12962/j24423998.v16i1.8564

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