Urban growth over Singapore is noticeable with increase in built-up area and significant sprawling with more than two-fold growth. Effects of urbanization patterns are investigated in two scenarios named as dry and wet, during the inter-monsoon period under high convective and low advection conditions. Weather Research and Forecasting model has been used with a finer resolution. Urban effects have been incorporated by coupling a single-layer urban canopy model. Four main experiments are designed: CTRL, SURB, NURB and HURB. CTRL uses near-realistic land-use, SURB hosts the asymmetric land-use with urban areas in south and east, NURB contains urbanization in the northern parts and HURB has homogeneous land-use. The dry case shows nocturnal southward passage of a land-breeze front, the western section of which is stopped in NURB. It is because, the urban heat island is isolated from (contiguous to) warm nocturnal sea in NURB (in SURB and HURB). CTRL shows earlier arrival of the land-breeze front, demonstrating the urbanization impact. In the wet case, HURB shows rainfall distribution as a combination of complementary distributions in NURB and SURB. Here, green spaces mediate transient negative feedback on rising daytime surface temperature by enhancing surface sensible heat flux, aiding to the local rainfall.

中文翻译：

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两种截然不同的天气情景下新加坡独特城市化影响的数值模拟

新加坡的城市增长引人注目，建成区面积增加，城市扩张速度超过两倍。在季风间期、强对流和平流条件下，研究了干湿两种情景下城市化模式的影响。天气研究和预报模型已使用更精细的分辨率。通过耦合单层城市冠层模型纳入了城市效应。设计了四个主要实验：CTRL、SURB、NURB 和 HURB。 CTRL 使用接近现实的土地利用，SURB 包含南部和东部城市地区的不对称土地利用，NURB 包含北部地区的城市化，HURB 具有均匀的土地利用。干燥情况显示陆地风锋在夜间向南移动，其西段在 NURB 停止。这是因为，城市热岛与 NURB（在 SURB 和 HURB 中）温暖的夜间海洋隔离（毗邻）。 CTRL 显示陆风锋提前到来，展示了城市化的影响。在潮湿的情况下，HURB 将降雨分布显示为 NURB 和 SURB 互补分布的组合。在这里，绿色空间通过增强地表感热通量来调节白天地表温度上升的短暂负反馈，从而有助于当地降雨。