SIMULATION OF SEA BREEZE EFFECT ON THE DISTRIBUTION OF PM2.5 IN DKI JAKARTA USING WRF-CHEM

• Main Author: Dian Safitri, Aliffia
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85177
• Institution: Institut Teknologi Bandung

The phenomenon of sea breeze can affect local wind circulation in DKI Jakarta, this condition further influences the distribution pattern of PM2.5 which is shown by the observation results in previous studies showing PM2.5 concentrations inland are higher than coastal during the daytime sea breeze. However, simulation studies of the effect of sea breeze on PM2.5 distribution in DKI Jakarta are still limited, especially against existing observations. In this simulation, we will use the SBF event identified by Mardliyah (2022) which is then verified to find out how the sea breeze simulation performance on pollutant distribution using the WRF-Chem model. Based on the performance analysis, it is expected to know how good the WRF-Chem model is in simulating sea breeze and PM2.5 distribution patterns in DKI Jakarta during the observation period. The simulation results show that the model tends to underestimate the observation data. Judging from the wind parameter, the dominant wind in the observation data is calm wind, then the simulation results show a stronger wind value than the observation. The cloud cover shows that the model has a time lag of 3 hours against the observation data. While from the PM2.5 value, a good correlation occurs when the SBD is weak with a value of 0,82. Then the simulation results show a small error value during strong SBD which is indicated by a lower RMSE value than during weak SBD, with a value of 13,03. During strong SBD, the simulation shows the presence of sea breeze circulation, sea breeze speed of 4 m/s, PM2.5 concentrations near the surface tend to be low, the height of pollutant dispersion reaches 3 km, so that pollutants are well distributed during SBD. Whereas during weak SBD, the sea breeze speed is 2-3 m/s, showing no sea breeze circulation, the concentration of pollutants near the surface tends to be high, with the height of pollutant dispersion only reaching 2 km, so that pollutants are not quickly dispersed. In general, the simulation is close to the observation data when the SBD is weak.