• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Berichte des Meteorologischen Institutes der Universitat Freiburg >Estimating down- and up-welling thermal radiation for use in mean radiant temperature
【24h】

Estimating down- and up-welling thermal radiation for use in mean radiant temperature

机译：估算用于平均辐射温度的上下热辐射

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Thermal radiation significantly impacts the energy balance of human beings, and is usually assessed via mean radiant temperature T_(mrt). The longwave down-welling radiation (LDR) and the up-welling from ground (LUR) are rarely measured, but are in the same order of magnitude as daily means of shortwave irradiation. This study evaluates simple, but theoretically based algorithms for LDR and LUR by comparison with measurements in regionally differing climates of Germany. LDR is modelled via the clear-sky algorithm (LDR_c) of Prata in a version converging against a realistic value for a completely dry atmosphere. Its advantage is an improved predicted variance. To account for cloud impact, a shortwave cloud modification factor (CMF_(sol)) derived from frequently measured solar global irradiation is applied for daylight hours and observed total cloudiness at night-time, respectively. It is accounted for the diurnal course in the effective temperature via relative humidity, whose impact is modulated dependent on cloud cover and altitude. LUR is modelled using the parameterisation of the Klima-Michel-Model. The selected algorithms show a universal applicability. A CMF_(sol) is more closely related to hemispherical cloud base emittance than any cloud correction scheme requiring synoptic cloud observations. The LUR model accounts for 90 – 97 % of variance in observations. The uncertainty in T_(mrt) due to estimated LDR and LUR is comparable to that of the shortwave radiation components.
机译：热辐射显着影响人类的能量平衡，通常通过平均辐射温度T_（mrt）进行评估。很少测量长波向下辐射（LDR）和地上向上辐射（LUR），但是它们与短波辐射的日常手段的数量级相同。通过与德国不同地区气候的测量结果进行比较，本研究评估了简单但基于理论的LDR和LUR算法。 LDR通过Prata的晴空算法（LDR_c）建模，其版本与完全干燥的大气的实际值相一致。其优点是改善了预测方差。为了说明云的影响，分别从白天经常测量的太阳总辐射得出的短波云修正因子（CMF_（sol））用于白天，并在夜间观察到总的浑浊。它是通过相对湿度在有效温度下的昼夜变化过程，其影响取决于云量和高度。使用Klima-Michel模型的参数化对LUR进行建模。所选算法显示出通用性。与任何需要天气观测云的云校正方案相比，CMF_（sol）与半球形云基准辐射更紧密相关。 LUR模型占观测值方差的90 – 97％。由于估计的LDR和LUR导致的T_（mrt）不确定性与短波辐射分量的不确定性相当。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号