Impacts of ERA5 Sea Surface Temperature Data on WRF Model Simulation of Extreme Rainfall Over South Kalimantan
Rezky Yunita (a*), Achmad Fahruddin Rais (b), Wido Hanggoro (a), Donaldi S. Permana (a), Muhamad Rifki Taufik (a), Erwin Eka Syahputra Makmur (a), Jaka Anugerah Ivanda Paski (a), Roni Kurniawan (a), Muhamad Husein Nurrahmat (a), Thahir Daniel F Hutapea (a), Welly Fitria (a), Sri Noviati (a), Rahayu Sapta Sri Sudewi (a), Vestiana Aza (a), Fatkhurroyan (a)

(a) Research and Development Center, Indonesia Agency for Meteorology, Climatology and Geophysics, Kemayoran, Jakarta, Indonesia
*rezky.yunita[at]bmkg.go.id
(b) Geospatial Disaster and Energy Potential Research Group, National Research and Innovation Agency, Cibinong, West Java, Indonesia

Abstract

This study aimed to investigate the impact of sea surface temperature (SST) on Weather Research and Forecasting (WRF) model simulation of the extreme weather events over South Borneo that occurred on 13 January 2021. There are two simulation scenarios in this study. The first scenario was conducted with NCEP Final Analysis Data (FNL) 0.25 as Boundary Condition. The second scenario was using the same boundary condition but with adjustment in the Sea surface temperature condition from ERA5 Operational Sea Surface Temperature and Sea Ice Analysis (OSTIA) data product. The result show that the rainfall amount was improved in the simulation using ERA5 Sea Surface Temperature data especially during the peak of the extreme rainfall event. This study also highlight the role of domain resolution and grid number to the extreme rainfall simulation.

Keywords: WRF, ERA5, SST, Extreme rainfall, Numerical Weather Prediction

Topic: Ocean-Atmosphere Dynamics