The Study Of Ocean Wave Climate Variabilites around Indonesia Seas M A Rahman, M F Geonova, S Prasetyo, S R Adiprabowo, A Ramdhani, D S Permana
Indonesia Agency of Meteorological, Climatological, and Geophysical
Abstract
This study investigates the spatial-temporal variations in ocean wave climate in the Indonesian seas based on 20 years of wave data from a wave model hindcast called Ina-Waves that is forced with surface winds from the GFS and NCEP-NFL for the coarse domain and a 10 km resolution WRF model for the Indonesian high-resolution domain. The hindcast data provides information on significant wave height, wave period, and wave direction, allowing for a comprehensive analysis of wave climate dynamics over an extended period. The study focuses on the influence of regional climate factors on wave patterns, such as monsoonal winds, tropical cyclones, and large-scale climate oscillations such as the Madden-Julian Oscillation (MJO), El Nino-Southern Oscillation (ENSO), and Indian Ocean Dipole (IOD). In addition, wind speed analysis was carried out to improve the assessment of the impact of regional climatic drivers. The key findings indicate that the IOD, ENSO, and MJO have a significant impact on wave conditions in Indonesian seas. Positive phases of the IOD and El Nino events are related to high wave activity in specific regions of the Indonesian seas as a result of changes in atmospheric circulation patterns, which impact trade wind patterns and result in higher wave heights in particular regions. On the other hand, negative phases of the IOD and La Nina occurrences may result in lower wave activity due to weaker trade winds. Because of its influence on atmospheric convection and wind patterns, the MJO can contribute to the variation of wave conditions in the region. It should be noted that the combined effect of these climate drivers on ocean wave height varies regionally and seasonally. Furthermore, understanding these complex relationships is essential for improving wave height forecasting and assessing the impact of climate change on coastal regions and maritime activities
Keywords: ocean wave climate, spatial-temporal variations, ina-waves, indonesian seas
