基于WRF的城市热岛效应高分辨率评估方法

Assessment method of urban heat island high resolution based on WRF

为解决城市总规尺度气候评估工具缺乏的问题,分析了不同气候评估方法的特点和应用范围,研究了气象学工具WRF在城市热岛效应评估中的应用方法及有效性。建立了针对城市总规尺度的高精度城市规划信息数据库、气象数据库生成WRF模拟边界的方法;明确了高精度城市热岛效应模拟所需的WRF物理方案。以沿海城市大连夏季典型晴朗高温天气为例,利用WRF模型进行了300m的高分辨率模拟。结果表明,WRF可以较好地模拟出城市热岛效应的强度和时空变化;将模拟结果与气象站和现场观测值进行了对比,两者变化趋势一致,偏差在可接受的范围之内。

Different climate assessment tools＇ features and application scope were analyzed to solve the problem of lack of climate assessment tools in the urban master planning scale.The WRF model＇s application method and validity was studied in urban heat island（UHI）evaluation.According to the demand of urban master planning scale,the method to generate WRF simulation boundary conditions with high resolution urban geographic and land cover data was established.The physics schemes for WRF high resolution simulation were also clarified.A typical summer hot weather day was taken as the research background in the coastal city of Dalian,the WRF model was used to simulate the UHI effect with the resolution of 300 meters.The results showed that WRF model could reproduce the intensity,temporal and spatial variation of UHI effect.The simulation results were compared with the data of weather station and the in situ observation,their change trend was found to be consistent and the deviation was within the acceptable range.