RT Journal Article
T1 Urban intensification of convective rainfall over the Singapore – Johor Bahru region
A1 Simón-Moral, Andres
A1 Dipankar, Anurag
A1 Doan, Quang Van
A1 Sanchez, Claudio
A1 Roth, Matthias
A1 Becker, Erik
A1 Huang, Xiang Yu
A1 Simón‐Moral, Andres
AB Simulations of five November months (2010–2014) using the urban version of the numerical weather prediction system of the Meteorological Service Singapore (uSINGV) are used to analyse the urban effect on convective precipitation over Singapore and Johor Bahru (Malaysia). The model is able to closely predict locations where rainfall peaks occur, but rainfall totals are overestimated compared to radar data. The temporal variability of rainfall in the region shows that urban areas increase the frequency and severity of rainfall events and that such impact increases with the rainfall intensity. Results show that low-level moisture advection is enhanced in this coastal conurbation as a result of the strengthening of wind convergence. The latter is likely caused by increasing sea-breeze strength due to lower surface pressure over the urban area, and higher urban surface roughness, respectively. As a consequence, more precipitable water is available in the region, enhancing convection and increasing the probability of heavy rainfall over the centre and north of Singapore island and Johor Bahru. Stronger convection further increases moisture advection from the vicinity. By studying the temporal variability and the spatial distribution of rainfall events, the present study provides new insights on the urban impact on heavy rainfall in tropical areas. The conclusions are only valid for the November inter-monsoon period, when local forcing, rather than large-scale influences, dominates rainfall generation.
SN 0035-9009
YR 2021
FD 2021-10-01
LA eng
NO Simón-Moral , A , Dipankar , A , Doan , Q V , Sanchez , C , Roth , M , Becker , E , Huang , X Y & Simón‐Moral , A 2021 , ' Urban intensification of convective rainfall over the Singapore – Johor Bahru region ' , Quarterly Journal of the Royal Meteorological Society , vol. 147 , no. 740 , pp. 3665-3680 . https://doi.org/10.1002/qj.4147
NO Publisher Copyright: © 2021 Royal Meteorological Society.
NO This work has been funded by the National Environmental Agency (NEA) of Singapore through a Research Collaborative Agreement (R‐109‐000‐338‐236‐490) with the National University of Singapore (NUS). The authors would like to thank Prasanna Venkatraman for supplying the boundary conditions driving the uSINGV simulations.
DS TECNALIA Publications
RD 23 jul 2024