Urbanization-induced land and aerosol impacts on sea-breeze circulation and convective precipitation
Urbanization-induced land and aerosol impacts on sea-breeze circulation and convective precipitation
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DOI：
10.5194/acp-20-14163-2020
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发表时间：
2020-11-23
影响因子：
6.3
通讯作者：
Rosenfeld, Daniel
中科院分区：
文献类型：
--
作者：
Fan, Jiwen;Zhang, Yuwei;Rosenfeld, Daniel
城市化导致的土地覆盖和气溶胶变化可能会影响对流云和降水。在这里，我们调查如何休斯敦城市化可以修改海风引起的对流云和降水通过城市土地效应和人为气溶胶的影响。模拟进行了化学版本的天气研究和预报模型（WRF-Chem），这是再加上光谱箱微物理（SBM）和多层城市模型与建筑物的能量模型（BEM-BEP）。我们发现，休斯顿城市化（城市土地和人为气溶胶的共同作用）显着增强风暴强度（最大垂直速度的75%左右）和降水强度（高达45%），与人为气溶胶的影响更显着的城市土地的影响。城市陆地效应改变了对流的演变过程：加速暖云向混合云的转变，使地面降水提前发生，但减缓了对流单体的消散，这是城市加热导致的较强海风环流的结果。在云发展成混合相云后，人为气溶胶的作用变得明显，加速了风暴从混合相云向深云发展约40 min。气溶胶通过气溶胶-云相互作用（ACI），主要通过激活混合相云和深云阶段的大量超细粒子来增强对流强度和降水。这项工作表明，考虑城市土地和人为气溶胶的影响，了解城市化对对流云和降水的影响的重要性。
Changes in land cover and aerosols resulting from urbanization may impact convective clouds and precipitation. Here we investigate how Houston urbanization can modify sea-breeze-induced convective cloud and precipitation through the urban land effect and anthropogenic aerosol effect. The simulations are carried out with the Chemistry version of the Weather Research and Forecasting model (WRF-Chem), which is coupled with spectral-bin microphysics (SBM) and the multilayer urban model with a building energy model (BEM-BEP). We find that Houston urbanization (the joint effect of both urban land and anthropogenic aerosols) notably enhances storm intensity (by similar to 75% in maximum vertical velocity) and precipitation intensity (up to 45 %), with the anthropogenic aerosol effect more significant than the urban land effect. Urban land effect modifies convective evolution: speed up the transition from the warm cloud to mixed-phase cloud, thus initiating surface rain earlier but slowing down the convective cell dissipation, all of which result from urban heating-induced stronger sea-breeze circulation. The anthropogenic aerosol effect becomes evident after the cloud evolves into the mixed-phase cloud, accelerating the development of storm from the mixed-phase cloud to deep cloud by similar to 40 min. Through aerosol-cloud interaction (ACI), aerosols boost convective intensity and precipitation mainly by activating numerous ultrafine particles at the mixed-phase and deep cloud stages. This work shows the importance of considering both the urban land and anthropogenic aerosol effects for understanding urbanization effects on convective clouds and precipitation.