Monsoonal upwelling generally occurred along the coasts of South Java to Western Sumatera. The aimed of this study was to estimate the upwelling intensity derived from sea surface temperature (SST) and chlorophyll-a. SST and chlorophyll-a data was obtained from 3 rd level of Aqua-MODIS satellite censor, and wind data derived from Quikscat satellite censor on July 2002 to June 2011. Upwelling index derived from coastal upwelling index (CUIx) formula. Statistical analysis was used to describe the relationship of SST and chlorophyll-a to CUIx. The result of this study show that the occurrence of upwelling was in east monsoon temporally, the range of SST is about 25.10 -27.30°C and chlorophyll-a is about 0.30 -0.67 mg m -3 . However in 2006 the anomaly of upwelling intensity coincide perfectly with the descend of SST to 24.98 °C (Sout Java) and 25.97 °C (West Sumatera), meanwhile the concentration of chlorophyll-a is increase to 1.3 mg m -3 (West Sumatra) and 3.71 mg m-3 (South Java). Statistical analysis show that the SST give a strong relationship between CUIx and SST (r=0.84) in West Sumatera. Meanwhile in South Java, both of those parameters (SST and Chlorophyll-a) gives the strong relationship to CUIx respectively (r= 0.86 and r = 0.81).Keywords: chlorophyll-a, coastal Upwelling Index, sea surface temperature, Western Sumatera ABSTRAKUpwelling musiman pada umumnya terjadi di sepanjang selatan jawa hingga barat sumatra. Penelitian ini bertujuan untuk mengestimasi intensitas upwelling dari data SPL dan konsentrasi klorofil-a dari sensor satelit. Data SPL dan Klorofil-a yang digunakan adalah data satelit Aqua-MODIS level-3 dan data angin dari satelit Quikscat pada bulan Juli 2002 sampai Juni 2011. Indeks upwelling diperoleh dengan formula Coastal Upwelling Index (CUIx). Analisis statistik digunakan untuk melihat hubungan antara SPL dan klorofil dengan CUIx. Hasil penelitian menunjukan bahwa secara temporal upwelling terjadi pada musim timur, dengan kisaran SPL 25.10 -27.30 °C dan konsentrasi klorofil-a 0.30 -0.67 mg m -3 . Namun pada tahun 2006 terjadi anomali intensitas upwelling yang ditandai dengan SPL yang turun mencapai 24.98 °C (Selatan Jawa) dan 25.97 °C (Barat Sumatera), konsentrasi klorofil-a meningkat 1.33 mg m -3 (Barat Sumatera) dan 3.71 mg m -3 (Selatan Jawa). Hasil analisis menunjukkan bahwa SPL memiliki hubungan yang sangat kuat dengan CUIx di Barat Sumatra (r=0.84). Sementara di perairan selatan Jawa, kedua parameter (SPL dan klorofil-a) menunjukkan hubungan yang sangat kuat dengan CUIx (r=0.86 yang untuk SPL dan r = 0.81 untuk klorofil-a).
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