IDENTIFICATION OF DIURNAL VARIATIONS IN SEA-BREEZE WET AND DRY SEASONS ARE BASED ON WRF-ARW MODEL ON THE JAKARTA COAST (MAY 2018 – APRIL 2019)

• Main Author: Renaldi Arif Rahman, Acep
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85176
• Institution: Institut Teknologi Bandung

Indonesia's coastline is the second largest in the world. Rainfall greatly influences life, because all living things depend on rainfall water, such as drinking water for humans and animals, as well as photosynthesis for plants. The characteristic of rain that forms on the coast is because LSB (Land-Sea Breeze) has a high frequency due to the area of the coast itself and other influences. Therefore, the influence of coastal area and the contribution of SB to rainfall makes SB very important to research in Indonesia. Indonesia's coastline is the second largest in the world. Rainfall greatly influences life, because all living things depend on rainfall water, such as drinking water for humans and animals, as well as photosynthesis for plants. The characteristic of rain that forms on the coast is because LSB (Land-Sea Breeze) has a high frequency due to the area of the coast itself and other influences. Therefore, the influence of coastal area and the contribution of SB to rainfall makes SB very important to research in Indonesia. Sea-breeze-day (SBD) simulations in the big city of Jakarta using the WRF model were studied continuing previous research. The model simulations have been previously evaluated with cloud cover from satellites and meteorological observation data with high temporal resolution in 2017 and 2018. In this study, the diurnal variation of SBD will be studied in the wet months (December-JanuaryFebruary) and the dry months (June-July- August). This research found that with the WRF model the sea breeze in Jakarta is mostly 30 minutes (onset time) and 1-1.5 hours (decay time) faster in the wet months (December) compared to the dry months (June-July-August). However, for the wet months (January-February) the frequency (60-64% > 40-56%), duration (30-60 minutes), and propagation speed (2-14 m/s) are greater than in the dry months. The influence of temperature differences between land and ocean produced by the model is the determining factor.