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Turbulence integral length and footprint dimension with reference to experimental data measured over maize cultivation in Po Valley, Italy

机译:湍流积分长度和足迹尺寸,参考意大利波谷玉米种植过程中测得的实验数据

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摘要

The atmospheric turbulence in the planetary boundary layer (PBL) governs the mass and energy exchange over the soil-vegetation-atmosphere system. Micrometeorological stations based on the eddy-covariance technique have been recently developed for the assessment of latent and sensible heat fluxes through high frequency measurements of the fluctuating component of wind velocity, temperature and air water content in the PBL. Correct interpretation of such measurements requires assessment of the actual source area (footprint) contributing to the eddy fluxes (latent and sensible heat). Many different approaches have been developed to estimate the source area function but there is no general consensus on the accuracy and applicability of these methods. The objective of this work is to demonstrate the existence of a relationship between the representative source area for eddy covariance measurements, and the large eddies responsible for the transport of turbulent kinetic energy (TKE). Moreover, the energy balance closure was used to analyze the possible effects of the different lengths of the source area on the heat fluxes. A series of measurements were carried out in a micrometeorological eddy covariance station located in a maize field in Landriano in Po Valley (PV), Italy. The results show that the dimension of the large eddies is tightly bound to the footprint size, leading to a new approach to study the eddy covariance measure based on the assessment of the turbulence scale.
机译:行星边界层(PBL)中的大气湍流控制着土壤-植被-大气系统的质量和能量交换。最近已经开发出基于涡度协方差技术的微气象站,用于通过对PBL中风速,温度和空气含水量的波动分量进行高频测量来评估潜热通量和感热通量。正确解释此类测量需要评估造成涡流(潜热和显热)的实际辐射源面积(足迹)。已经开发出许多不同的方法来估计源区域功能,但是对于这些方法的准确性和适用性尚无普遍共识。这项工作的目的是证明涡流协方差测量的代表性源区域与负责湍流动能(TKE)传输的大涡流之间是否存在关系。此外,使用能量平衡闭合来分析源区域的不同长度对热通量的可能影响。在位于意大利波谷(PV)的兰德里阿诺(Landriano)玉米田的微气象涡流协方差站进行了一系列测量。结果表明,大涡的尺寸与足迹的大小紧密相关,从而导致了一种基于湍流尺度评估研究涡协方差度量的新方法。

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