My research interests are investigating the ocean-atmosphere interaction on the mesoscale oceanic features over the Indonesian seas, and also exploring their linkage to the Indonesian Throughflow and the Indo-Pacific climate variabilities. In addition to my research focus on the Indonesian seas, my colleagues at the BRIN Indonesia and I are working on a web-based maritime information system that integrates daily forecasts of ocean weather and potential fishing grounds, named SEMAR (https://semar-prototype.brin.go.id/), to assist the fishermen in capturing fish, as well as the Indonesian stakeholders in maritime sectors to establish strategies for marine navigation safety, sustainable fisheries, and climate resilience.

Publications:

• Hatmaja, R.B. & Zandika, R. (2024). The Atmospheric Processes on the Variation of Thermal Fronts and Chlorophyll-a Concentration Over the Indonesian Fisheries Management Area 711 During the Indian Ocean Dipole Events. Springer Proceedings in Physics 305, https://doi.org/10.1007/978-981-97-0740-9_14. 
• Hatmaja, R.B., Ramadhan, M. R., Wicaksana, S. K. J., & Suaydhi. (2023). Anomalous Sea Surface Temperature and Chlorophyll-a Induced by Mesoscale Cyclonic Eddies in the Southeastern Tropical Indian Ocean During the 2019 Extreme Positive Indian Ocean Dipole. Springer Proceedings in Physics 290, https://doi.org/10.1007/978-981-19-9768-6_47
• Yulihastin, E., Fathrio, I., Sulaiman, A., Hatmaja, R. B., Satyawardhana, H., Nauval, F., Nugroho, D., Djamaluddin, T., Pranowo, W. S., Bramawanto, R., Basit, A., Mujiasih, S., Ismail, M. F. A., Lestari, S., Ratnawati, H. I., Nugroho, J. T., & Nuryanto, D. E. (2023). Propagation of tropical squall line-induced storm coastal inundation episodes in Java-Bali, Indonesia. Heliyon, 9(9), https://doi.org/10.1016/j.heliyon.2023.e19804.
• Yulihastin, E., Taofiqurohman, A., Fathrio, I., Nauval, F., Andarini, D. F., Hatmaja, R. B., Fahim, A., Perdani, N. M., Satyawardhana, H., Ismail, M. F. A., Nugroho, D., Suaydhi, Sofiati, I., Avia, L. Q., & Ratnawati, H. I. (2023). Evolution of double vortices induce tropical cyclogenesis of Seroja over Flores, Indonesia. Natural Hazards, 117, 2675-2692, https://doi.org/10.1007/s11069-023-05961-8.
• Hatmaja, R. B., Munthe, C. C., Yulihastin, E., & Pramudia, K. E. (2022). Atmospheric response to the Southern Java upwelling variability associated with positive Indian Ocean Dipole event. Springer Proceedings in Physics 275, https://doi.org/10.1007/978-981-19-0308-3_3.
• Hatmaja, R. B., ‘Adany, F., Sari, W. J., & Kombara, P. Y. (2022). Atmospheric methane variability during upwelling events in the Southern Coast of Java, Indonesia. Springer Proceedings in Physics 275, https://doi.org/10.1007/978-981-19-0308-3_24.
• Hatmaja, R. B., Rusmanansari, A. H., & Radjawane, I. M. (2019). The dynamics of negative Indian Ocean Dipole (nIOD) and its relation to the anomalous high rainfall in West Java Province, Indonesia. IOP Conference Series: Earth and Environmental Science, 303(1). https://doi.org/10.1088/1755-1315/303/1/012004.
• Hatmaja, R. B., Wisha, U. J., Radjawane, I. M., & Tanto, T. A. (2019). Correlation and coherence analysis between sea surface temperature (SST) and surface wind in the Equatorial Western Sumatra Waters. IOP Conference Series: Earth and Environmental Science, 303(1). https://doi.org/10.1088/1755-1315/303/1/012003.
• Radjawane, I. M., Hatmaja, R. B., Manullang, J. F., & Trilaksono, N. J. (2019). Temporal and spatial variation of surface heat flux in Makassar Strait. IOP Conference Series: Earth and Environmental Science, 303(1). https://doi.org/10.1088/1755-1315/303/1/012028

Presentation/Poster:

• The 4th International Conference on Maritime Sciences and Advanced Technology (MSAT): The Atmospheric and Oceanic Processes on Thermal Front Variability over the Java Sea (Bandung, ID/26 – 27 Oct 2023/Oral)
• The 2nd International Conference on Radioscience, Equatorial Atmospheric Science and Environment (INCREASE): Anomalous sea surface temperature and chlorophyll-a induced by mesoscale cyclonic eddies in the Southeastern Tropical Indian Ocean during the 2019 Extreme Positive Indian Ocean Dipole (Bandung, ID/22 – 23 Nov 2022/Oral)
• The 1st International Conference on Radioscience, Equatorial Atmospheric Science, and Environment (INCREASE): Atmospheric response to the Southern Java upwelling variability associated with positive Indian Ocean Dipole event (Bandung, ID/20 – 21 Sep 2021/Oral)
• The 27th Australian Meteorological and Oceanographic Society (AMOS) Annual Conference and the International Conference on Indian Ocean Meteorology and Oceanography: The linkage between Indian Ocean Dipole asymmetry and the South-eastern Indian Ocean upwelling (Fremantle, AU/10 – 14 Feb 2020/Poster)
• The 2nd International Conference on Maritime Sciences and Advanced Technology (MSAT): The dynamics of sea surface temperature and zonal wind in Equatorial Indian Ocean during Indian Ocean Dipole event in 1993-2016 (Makassar, ID/7 – 8 Aug 2019/Oral)