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首页> 外文期刊>Journal of Applied Meteorology and Climatology >Impacts of Anthropogenic Heat Flux and Urban Land-Use Change on Frontal Rainfall near Coastal Regions: A Case Study of a Rainstorm over the Pearl River Delta, South China
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Impacts of Anthropogenic Heat Flux and Urban Land-Use Change on Frontal Rainfall near Coastal Regions: A Case Study of a Rainstorm over the Pearl River Delta, South China

机译：人为热通量和城市土地利用变化对沿海地区前落地的影响 - 以南方珠江三角洲暴雨为例

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摘要

This study investigated heavy frontal rainfall that occurred on 13-14 October 2011 over the Pearl River Delta (PRD) in China. The frontal rainstorm was simulated using the WRF-ARW Model (version 3.3), which included its urban canopy model. Although the model-simulated convection occurred 2 h early and the second precipitation peak was underestimated, the model represented the formation, development, and extinction of the frontal rainfall and captured the distribution of the peak value. In addition, the averaged value of 49.7 W m(-2) was taken as the anthropogenic heat flux (AHF) of the PRD, and two land-use datasets were adopted: one for 1992 and the other for 2011. The simulation revealed that AHF and urban land-use change (ULUC) increased the total rainfall over the PRD by 6.3% and 7.4% and increased the maximum hourly rainfall intensity by 24.6% and 21.2%, respectively. Furthermore, to elucidate the mechanism of AHF and ULUC influence, the rainstorm structure, low-level jet (LLJ), and CAPE of the rainfall event were analyzed. It was found that AHF and ULUC enhanced two strong southward LLJs located over the urban areas, which carried abundant water vapor to the PRD and generated additional upper-level CAPE. This not only sustained steady ascent of the air, but it also created conditions favorable for downward motion, resulting in large persistent convective clouds and heavy frontal rainfall.
机译：本研究调查了2011年10月13日至14日在中国的珠江三角洲（珠三角）发生的沉重正面降雨。使用包括其城市冠层模型的WRF-ARW模型（3.3版）模拟了正面暴雨。虽然模型模拟对流早期发生2小时，但第二次降水峰被低估，该模型代表了额落降雨的形成，发展和灭绝并捕获了峰值的分布。此外，将平均值为49.7W m（-2）作为PRD的人为热通量（AHF），采用了两种土地使用数据集：1992年，另一个用于2011年。模拟显示AHF和城市土地利用变化（ULUC）将普遍存产增加6.3％和7.4％，分别增加了最高每小时降雨强度24.6％和21.2％。此外，为了阐明AHF和ULUC影响的机制，分析了降雨事件的暴雨结构，低水平喷射（LLJ）和降雨事件的斗篷。有人发现，AHF和ULUC增强了位于城市地区的两个强大的南方LLJ，它带来了丰富的水蒸气，并产生了额外的上层斗篷。这不仅持续稳定上升空气，而且它也创造了对向下运动有利的条件，导致持续的持续反射云和沉重的正面降雨。

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