Estimation of mean radiant temperature in cities using an urban parameterization and building energy model within a mesoscale atmospheric model
Estimation of mean radiant temperature in cities using an urban parameterization and building energy model within a mesoscale atmospheric model
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使用中尺度大气模型中的城市参数化和建筑能源模型估算城市平均辐射温度
DOI：
10.1127/metz/2021/1091
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发表时间：
2021
影响因子：
1.2
通讯作者：
C. Schneider
中科院分区：
文献类型：
--
作者：
L. Jin;S. Schubert;D. Fenner;M. Hefny Salim;C. Schneider
白天，平均辐射温度Tmrt是分析人类热应激的重要气象参数之一。本研究对德国柏林市2018年夏季Tmrt进行了时空分析。为此，将中尺度气候模式COSMOCLM(CCLM)与带建筑能量模式的城市双峡谷效应参数化方案(DCEP-BEM)相耦合，得到Tmrt。该耦合模式系统CCLM/DCEP-BEM实现了使用中尺度模式动态计算微尺度城市街道峡谷的Tmrt。为了进行更准确的比较，采用两步法计算了CCLM/DCEP-BEM的辐射通量和Tmrt。辐射模型SOLWEIG首先根据测量结果进行验证，然后用于评估DCEP-BEM模型。总体上，CCLM/DCEP-BEM与SOLWEIG在Tmrt中具有良好的一致性(R2=0.96)。CCLM/DCEP-BEM模拟的夜间Tmrt高于SOLWEIG(MBE=2.9K)，但更接近实测值。与SOLWEIG(MBE=−3.1k)相比，用CCLm/DCEP-BEM模拟的下午时段的Tmrt被低估了。此外，剔除植被后，夜间Tmrt的值在密集的市中心比在结构更开放的郊区更高，而市中心中午的Tmrt值更低。这项研究为Tmrt在中尺度模式中提供了一个可靠的描述，并将有助于未来实施人类生物气象变量，如全球热气候指数或生理等效温度。这些量是使用Tmrt计算的。
During daylight hours, the mean radiant temperature Tmrt is one of the most important meteorological parameters to analyse heat stress for humans. This study conducts a spatio-temporal analysis of Tmrt for a summer period in 2018 for the city of Berlin, Germany. To this end, the mesoscale climate model COSMOCLM (CCLM) is coupled with the urban Double Canyon Effect Parameterization scheme with a building energy model (DCEP–BEM) to derive Tmrt. This coupled model system CCLM/DCEP–BEM enables a dynamic calculation of Tmrt for the microscale urban street canyons using a mesoscale model. To bring a more accurate comparison, a two-step approach is applied to assess the radiative fluxes and Tmrt from CCLM/DCEP–BEM. The radiation model SOLWEIG is first validated against measurement and then used to evaluate the DCEP–BEM model. Overall good agreement in Tmrt is found between CCLM/DCEP–BEM and SOLWEIG (R2 = 0.96). Nighttime Tmrt simulated with CCLM/DCEP–BEM is higher than that with SOLWEIG (MBE = 2.9K), yet closer to measurements. Tmrt during the afternoon hours modeled with CCLM/DCEP–BEM is underestimated compared to SOLWEIG (MBE = −3.1K). Further, excluding vegetation, higher values for nighttime Tmrt are found in the densely built-up city center than in the suburbs with more open structures, while the city center has lower values for Tmrt during midday. This study provides a reliable representation of Tmrt in a mesoscale model and would be beneficial for future implementation of human-biometeorological variables such as the Universal Thermal Climate Index or Physiological Equivalent Temperature. These quantities are calculated using Tmrt.