[A-CG32] Land-Atmosphere interactions and Asian monsoon precipitation (LAMos)

[ACG32-P01] Links between torrential rainfall and urban land use in Jakarta, Indonesia using Geographically Weighted Regression

*Asteria Satyaning Handayani^1,2, Yuzuru Isoda ¹ (1.Earth Science Department, Graduate School of Science, Tohoku University, Japan, 2.Agency for Meteorology Climatology and Geophysics (BMKG), Indonesia)

Keywords:Geographically Weighted Regression, torrential rainfall, urban land use, weather radar

Urban microclimate is an intriguing research topic even after decades of findings. The urban-enhanced precipitation is evident in metropolitan cities of Asian monsoon region, particularly in Japan and China. However, related studies performed in the Southeast Asia region are still rare compared to the latter countries. Therefore, this empirical study of torrential rainfall and urban land use in Jakarta, Indonesia, has been conducted with the aim of investigating the extent of how both are linked there. We used two consecutive years (2018-2019) of high-resolution data from C-band Doppler weather radar in Soekarno-Hatta International Airport, operated by the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG), as the main data. Geographically Weighted Regression (GWR) model is adopted to point out the spatially-varying relationships between rainfall and land use variables. The results show that the spatial regression technique analyses strongly indicate the significantly-positive contributions of urban land use parameters to the intensity, spatial, and seasonal characteristics of torrential rainfall in Jakarta. Spatiotemporal analysis of torrential rainfall amount during the selected period reveals distinct characteristics between wet and dry seasons downwind of the urbanized area. Results from this study provide more insights into the effect of urbanization on the precipitation in Jakarta and their predicted locations.