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首页> 外文期刊>Atmospheric environment >Evaluating a building-averaged urban surface scheme in an operational mesoscale model for flow and dispersion
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Evaluating a building-averaged urban surface scheme in an operational mesoscale model for flow and dispersion

机译：在流动和分散的操作中尺度模型中评估建筑物平均的城市地面方案

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摘要

A recently developed building-averaged urban surface scheme as coupled to an operational mesoscale model, TAPM, is evaluated for both flow and tracer dispersion using data from the 2002 Basel UrBan Boundary Layer Experiment (BUBBLE) conducted in the city of Basel, Switzerland. This scheme is based on the so-called town energy balance (TEB) approach and simulates turbulent fluxes using a generic canyon geometry to resolve energy balances for walls, roads and roofs. Air conditioning to close the building energy budget, in-canyon vegetation, and the effects of recirculation and venting of air within the canyon on turbulent fluxes are included. Comparison is also made with the original urban surface scheme of TAPM based on a simple slab approach with separate urban and vegetation-soil tiles and a specified anthropogenic heat flux. The results show that the new scheme leads to an overall improvement in the prediction of surface fluxes, and is able to reproduce the observed near-neutral to weakly unstable conditions at night, which is a feature of urban meteorology. In contrast, the slab scheme predicts stable conditions at night. The observed concentration fields from the tracer experiments are better simulated using the new scheme, but because there were no nighttime tracer releases, the capability of the new scheme under full diurnal conditions could not be demonstrated. For the applications considered here, the computational efficiency of the new scheme in TAPM is on par with the slab scheme.
机译：使用来自2002年在瑞士巴塞尔市进行的2002年巴塞尔城市边界边界层实验（BUBBLE）的数据，对最近开发的建筑物平均城市地面方案与可操作的中尺度模型TAPM进行了流量和示踪剂扩散评估。该方案基于所谓的城镇能源平衡（TEB）方法，并使用通用的峡谷几何形状模拟湍流，以解决墙壁，道路和屋顶的能量平衡。包括空调以关闭建筑物的能源预算，峡谷内的植被以及峡谷内空气的再循环和排出对湍流的影响。还与TAPM的原始城市表面方案进行了比较，该方案基于简单的平板方法，分别使用城市和植被土壤砖，并指定了人为热通量。结果表明，该新方案导致了对表面通量预测的全面改进，并且能够重现夜间观测到的近中性至弱不稳定条件，这是城市气象学的一个特征。相比之下，平板方案可以预测夜间的稳定状况。使用新方案可以更好地模拟从示踪剂实验观察到的浓度场，但是由于没有夜间释放示踪剂，因此无法证明新方案在全日条件下的能力。对于此处考虑的应用，TAPM中新方案的计算效率与平板方案相当。

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