Links between local scale and catchment scale measurements and modelling of gas exchange processes over land surfaces

陆地表面和大气之间的气体交换正在成为气候系统的状态和未来建模的一个日益重要的组成部分，以加强气候和天气预测。由于陆地表面的巨大不均匀性和大气运动的不同尺度依赖特征，在当前的测量和建模方法中，在解决这些过程方面存在尺度差距：没有明确的概念存在，从当地规模的交换过程发生在接近和在陆地表面，适用于描述和模拟大气环境中这些输送的尺度，例如分别采用涡动协方差方法和通用边界层模型。该项目将通过一种综合方法来处理这一问题，这种方法将一套不同的当地测量技术与边界层尺度估计结合起来，从传统技术到现代遥感工具，以及一套涵盖整个大气边界层的建模方法。将设计和应用一种特别适合于从测量方面关闭刻度间隙的通量室概念。

Gas exchange between the land surface and the atmosphere is becoming an increasingly important component in modelling the state and the future of the climate system for enhanced climate and weather prediction. Due to the vast inhomogeneity of the land surface and the different scale-dependent characteristics of atmospheric motions there exists a scale gap in addressing these processes in current measurement and modelling methods: No clear concept exists to bridge from the local scale where exchange processes happen close to and at the land surface, to the scales which are suitable to describe and model these transports in the atmospheric environment e.g. by eddy-covariance methods and common boundary layer models, respectively. This project will approach this problem by an integrated methodology combining a set of different local measurement techniques with boundary layer scale estimates ranging from traditional techniques up to modern remote sensing tools and a suite of modelling approaches encompassing the whole atmospheric boundary layer. A flux chamber concept especially adapted to closing the scale gap from the measurement aspect will be designed and applied.