Effects of urbanization on extreme rainfall in an arid/semiarid region

Li, Jialun; Mahalov, Alex; Hyde, Peter

doi:10.1002/asl.966

Cited by 7 publications

(1 citation statement)

References 37 publications

(44 reference statements)

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“…The evidence of urban rainfall modification is confirmed also in arid/semi‐arid cities (e.g. Li et al ., 2020a; Luong et al ., 2020). Also, some studies argue the reverse effect: urbanisation that reduces local precipitation (e.g.…”

Section: Introductionmentioning

confidence: 99%

Urban‐induced modifications to the diurnal cycle of rainfall over a tropical city

Doan

Dipankar

Simón-Moral

et al. 2021

Quart J Royal Meteoro Soc

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There is still no consensus on the mechanisms that modify precipitation over and around cities, especially for those located in the tropics where convective processes primarily drive rainfall. Here we contribute to the ongoing discussion about the urban-associated precipitation by investigating the urban effect on the diurnal cycle of rainfall over Singapore. We use the urban version of the numerical weather prediction system of the Meteorological Service Singapore (hereafter called uSINGV) at a 300 m horizontal resolution to simulate the rainfall conditions over Singapore and its surroundings during the inter-monsoon period between 2010 and 2014. Two simulations with different land surface conditions are conducted: one with urban areas (i.e. present conditions) and one without urban areas. uSINGV is shown to perform well for rainfall when compared to observations. Comparison between simulations reveals that the urban area is responsible for the formation of a rainfall "hot spot" over Singapore and Johor Bahru, located at the southern tip of the Malay Peninsula, and the urban effect is accountable for 20-30% of total rainfall during late afternoons and evenings, highlighting a strong urban effect on localized rainfall over a tropical city. Enhancement of convection due to the urban heat island effect, increased frictional convergence due to buildings' drag, the seaward shift of the sea-breeze front, and the increased inflow of boundary-layer moisture by the stronger sea breeze are suggested as most probable reasons for the increased rainfall in the urban area.

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Section: Introductionmentioning

confidence: 99%