Chequamegon Heterogeneous Ecosystem Energy-balance Study Enabled by a High-density Extensive Array of Detectors (CHEESEHEAD) – The German Contribution

由高密度广泛探测器阵列 (CHEESEHEAD) 实现的 Chequamegon 异质生态系统能量平衡研究 – 德国贡献

• 批准号: 406980118
• 负责人: Professor Dr. Matthias Mauder
• 金额: --
• 依托单位: Department of Atmospheric and Oceanic Sciences
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/406980118?language=en
• 关键词: Chequamegon; Heterogeneous; Ecosystem; Energy; balance

The overall goal of the submitted proposal is the investigation of the impact of surface heterogeneity on the spatio-temporal variability and dynamics of the atmospheric boundary layer. This activity is planned as a cooperation with American (USA) partners, who concurrently submit a corresponding proposal to NSF. The German contribution will be large eddy simulations (LES) of turbulent transport processes in order to investigate the causes of the apparent closure gap in the surface energy balance. This will allow for examining the partitioning between sensible and latent heat flux and developing a parametrisation determining the meso-scale flux contribution of the order of 1 km. a high-density extensive detector array recording data with a high spatio-temporal resolution in the area under investigation is required for a successful accomplishment of this aim. A central 420 m tall meteorological tower will be surrounded by 20 eddy covariance stations, supplemented by airborne measurements, passive and active remote sensing devices. The proposed German contribution to this field campaign is the deployment of two scanning wind LiDAR systems and a newly developed scanning LiDAR system for the measurement of temperature and water-vapor distributions. The latter is a combination of a rotational Raman-LiDAR (Temperature) and a differential absorption LiDAR (DIAL, absolute humidity). Only a continuous operation of this system yields the spatio-temporal resolution required for the overall project. Particularly, water vapor profiling with the DIAL technique on a mobile platform in the field is highly innovative. Thus, establishing this technology in the field of boundary-layer meteorology is one goal of this proposal.

所提交提案的总体目标是调查地表异质性对大气边界层时空变异和动态的影响。该活动计划作为与美国（美国）合作伙伴的合作，同时向NSF提交相应的建议。德国的贡献将是湍流输送过程的大涡模拟，以调查表面能量平衡中明显闭合间隙的原因。这将允许检查感热通量和潜热通量之间的分区，并制定一个参数化确定中尺度通量贡献的顺序为1公里。为了成功地实现这一目标，需要在调查区域中以高时空分辨率记录数据的高密度广泛探测器阵列。一座420米高的中央气象塔周围将有20个涡度相关观测站，辅以空中测量、被动和主动遥感装置。德国对这一实地活动的拟议贡献是部署两个扫描风激光雷达系统和一个新开发的扫描激光雷达系统，用于测量温度和水汽分布。后者是旋转拉曼激光雷达（温度）和差分吸收激光雷达（DIAL，绝对湿度）的组合。只有该系统的连续操作才能产生整个项目所需的时空分辨率。特别是，在该领域的移动的平台上使用DIAL技术进行水蒸气剖面分析是高度创新的。因此，在边界层气象学领域建立这一技术是本提案的目标之一。