Rainfall Climatology Associated with Cyclonic and Non Cyclonic Events in Indonesia New Capital Based on IMERG and IBTrACS Nadya Rezky Ananda, Helmi Yusnaini, Marzuki Marzuki
Universitas Andalas
Abstract
The new capital city of Indonesia (IKN) is vulnerable to extreme rainfall events influenced by large-scale atmospheric systems, including tropical cyclones originating from the western Pacific Ocean. Extreme rainfall can occur even during the dry season when tropical cyclones occur. This study aims to analyze the contribution of tropical cyclones to rainfall in IKN. This study utilizes tropical cyclone track data from the International Best Track Archive for Climate Stewardship (IBTrACS) and daily rainfall data from IMERG from 2000 to 2024. Rainfall separation was carried out using the Objective Synoptic Analysis Technique (OSAT) by applying a 500 km radial buffer from the cyclone centre and a temporal window of plus minus 3 days around the peak intensity of each cyclone. Initial results have successfully separated spatially and temporally cyclone related and non cyclone related rainfall throughout IKN. This separation provides a solid basis for further analysis of the climatology of tropical cyclone rainfall in IKN, including long term trends, spatial distribution, and the influence of key atmospheric parameters such as relative humidity and sea surface temperature on tropical cyclone related rainfall. The results of this study are expected to support disaster risk reduction strategies and climate resilience planning in IKN.
Keywords: Tropical cyclone, Extreme rainfall, IMERG, IBTrACS, Indonesia New Capital
