Indonesia is influenced by two types of monsoons, namely, the Asian and Australian monsoons. The differences in conditions occurring during these monsoon phenomena can affect sea surface temperatures (SSTs). This study aims to determine the effect of these monsoons on the SSTs in the southeast Indian Ocean and the Indonesian throughflow (ITF) region. SST and geostrophic current data obtained from Copernicus Marine Service and surface wind speed and direction data from the European Center for Medium-Range Weather Forecasts (ECMWF) from March 2019 to February 2020 were statistically and descriptively analyzed. Observational conductivity–temperature–depth (CTD) data obtained in December 2019 were used to identify statistical errors in the Copernicus Marine Service SST data. The results of the SST data verification show a 0.85°C RMSE and 0.6°C MAE; they are significantly correlated at 0.82 with a 95% confidence level. The results of this study generally show that geostrophic currents move to the east, and SST tends to be warmer during the Asian monsoon period than during the Australian monsoon period, which has a cooler SST (with geostrophic currents moving to the northwest). Specifically, the SST conditions in the ITF region and southeast Indian Ocean cool from the MAM period. This cooling period intensifies during the JJA period and subsides in the SON period. The Australian monsoon, which is dominant during the DJF period, causes warmer-than-average SST conditions in the northern part of Indonesia, particularly the northern part of the ITF.

Arlindo telah dikenal luas sebagai satu-satunya saluran yang melewati daerah tropis dimana terjadi pertukaran massa air antar samudra, yaitu dari Samudra Pasifik menuju Samudra Hindia, dari Pasifik Barat Laut ke Samudra Hindia Selatan. Arlindo memiliki karakteristik yang sangat berkaitan dengan fenomena alam yang terjadi akibat gabungan dari proses-proses dinamika atmosfer dan samudra yang dipicu oleh adanya perubahan atau anomali iklim di Samudra Pasifik, yang nantinya berdampak pula terhadap keadaan iklim di Indonesia. Arlindo dapat mempengaruhi ENSO yang apabila terjadi akan menyebabkan berbagai bencana hidrometeorologi, salah satunya siklon tropis. Tujuan penelitian ini adalah untuk melihat pengaruh dari intensitas arlindo terhadap siklon tropis di Pasifik Barat Laut dan Samudra Hindia Selatan. Data yang digunakan adalah data siklon tropis dari JAXA (Japan Aerospace Exploration Agency), NII (National Institute of Informatics), dan BoM (Bureau of Meteorology) mulai tahun 1993-2017. Untuk intensitas Arlindo, digunakan data arus geostropik di perairan Indonesia yang didapat dari data Copernicus Marine. Hasilnya menunjukan bahwa saat intensitas arlindo melemah, terjadi peningkatan yang signifikan terhadap durasi siklon tropis di Samudra Hindia Selatan, namun tidak untuk intensitas siklonnya. Sementara itu, tidak ada signifikansi baik pada durasi maupun intensitas siklon di Pasifik Barat Laut.

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