Experimental determination of energy and matter exchange processes and their modelling on stand scale

能量和物质交换过程的实验确定及其在展台规模上的建模

• 批准号: 31825096
• 负责人: Professor Dr. Thomas Foken
• 金额: --
• 依托单位: Abteilung Mikrometeorologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/31825096?language=en
• 关键词: Experimental; determination; energy; matter; exchange

Within this sub-project the physical and partly also chemical processes on the stand scale will be investigated by experimental and modelling activities. Different experiments for summer, autumn, winter, and spring and a long term observing programme in the forest are planned to observe the following processes: advection, turbulence structure, flux gradients of meteorological and chemical quantities, boundary layer. Eddy-covariance and different REA techniques for energy and matter fluxes (including trace gases and isotopes) will be used. All data and especially the flux data are quality controlled with recently developed tools (similar as developed for CarboEuroflux). Pdfs (probability density functions) will be created for state variables and higher moments on the basis of the footprint, QA/QC and the meso- and microscale meteorological conditions. The current use of wavelet analysis to investigate coherent structures will be continued with conditional sample tools to be employed for more quantitative investigations and for determining the influence on forcing parameters to develop a more extended parameterization of the transilient matrix of the FLAME model (Forest-Land-Atmosphere Model). FLAME is actually applied to model exchange processes on the stand scale. In the first phase of the project, the 1D/2D-version, coupled to a detailed soil-plant model, is applied to predict the influences of detailed stand hydrology, physiology and advection on the cycles of water, energy, and trace substances. The sensitivity towards external and internal forcings will be studied. Pdfs for state variables and turbulent moments will be compared to those from experiments and extended for the application on landscape scale. The development of a 3D-version – first on stand scale – also requires the development and evaluation of the 3D transilient theory to describe the turbulent and convective mixing from the forest floor to the top of the atmospheric boundary layer. Based on the BayCEER monitoring programme with meteorological data und carbon dioxide and water vapour fluxes (http://www.bayceer.uni-bayreuth.de/), the relevant data will be made available for all sub-projects, with a focus on mainly on the modelling and remote sensing parts.

在这一分项目内，将通过实验和模拟活动调查林分规模的物理过程和部分化学过程。计划在森林中进行夏季、秋季、冬季和春季的不同实验和长期观测方案，以观测以下过程：平流、湍流结构、气象和化学量的通量梯度、边界层。将使用涡度协方差和不同的能量和物质通量（包括痕量气体和同位素）REA技术。所有数据，特别是通量数据，均采用最近开发的工具进行质量控制（与CarboEuroflux开发的工具相似）。将根据足迹、质量保证/质量控制以及中尺度和微尺度气象条件为状态变量和高阶矩创建概率密度函数。目前使用小波分析来研究相干结构的工作将继续进行，条件取样工具将用于更多的定量研究，并确定对强迫参数的影响，以便对火焰模式（森林-陆地-大气模式）的过渡矩阵进行更广泛的参数化。FLAME实际上被应用于模拟林分尺度上的交换过程。在该项目的第一阶段，1D/2D版本，再加上详细的土壤-植物模型，应用于预测详细的立场水文，生理和平流对水，能量和微量物质循环的影响。将研究对外部和内部作用力的敏感性。状态变量和湍流矩的Pdfs将与实验结果进行比较，并扩展到景观尺度上的应用。三维版本的开发-首先在林分尺度上-还需要开发和评估三维瞬态理论，以描述从森林地面到大气边界层顶部的湍流和对流混合。根据BayCEER监测方案的气象数据以及二氧化碳和水蒸气通量（http：//www.bayceer.uni-bayreuth.de/），将为所有分项目提供相关数据，重点主要放在建模和遥感部分。