Impact of the Urban Heat Island Effect on Precipitation over a Complex Geographic Environment in Northern Taiwan
Impact of the Urban Heat Island Effect on Precipitation over a Complex Geographic Environment in Northern Taiwan
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DOI：
10.1175/2010jamc2504.1
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发表时间：
2011-02-01
影响因子：
3
通讯作者：
Sheng, Yang-Fan
中科院分区：
文献类型：
--
作者：
Lin, Chuan-Yao;Chen, Wan-Chin;Sheng, Yang-Fan
为了评估台湾北部复杂地理环境下城市热岛效应对降水的影响，采用新一代中尺度模式WRF模式，结合Noah陆面模式和城市冠层模式UCM进行研究。基于中分辨率成像光谱辐射计（MODIS）卫星数据（MODIS案例）得到的更好的土地利用分类，与美国地质调查局（USGS案例）原始的25类土地利用分类（USGS案例）相比，它显著改善了累积降雨模式的模拟结果。在城市（MODIS）情况下，降水系统比非城市（USGS）情况下发展得晚，但更强。与雷达观测结果比较，模拟结果具有较好的预测效果；在MODIS的情况下，降雨系统不仅在城市下风的山区增强，而且在逆风的平原区也发生了增强。模拟结果表明，正确的土地利用分类是城市热岛模型研究的关键。热岛效应在扰动热动力过程中起着重要作用；在台湾北部复杂的地理环境中，它影响雷暴和降水的位置。
To evaluate the impacts of the urban heat island (UHI) effect on precipitation over a complex geographic environment in northern Taiwan, the next-generation mesoscale model, the Weather Research and Forecasting (WRF) model, coupled with the Noah land surface model and urban canopy model (UCM), was used to study this issue. Based on a better land use classification derived from Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data (the MODIS case), it has significantly improved simulation results for the accumulation rainfall pattern as compared with the original U.S. Geological Survey (USGS) 25-category land use classification (the USGS case). The precipitation system was found to develop later but stronger in the urban (MODIS) case than in the nonurban (USGS) case. In comparison with the observation by radar, simulation results predicted reasonably well; not only was the rainfall system enhanced downwind of the city over the mountainous area, but it also occurred at the upwind plain area in the MODIS case. The simulation results suggested that the correct land use classification is crucial for urban heat island modeling study. The UHI effect plays an important role in perturbing thermal and dynamic processes; it affects the location of thunderstorms and precipitation over the complex geographic environment in northern Taiwan.