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模拟气候系统状况和未来的一个日益重要的组成部分，以加强气候和天气预报。由于陆地表面的巨大非均质性和大气运动的不同尺度依赖特征，目前的测量和模拟方法在处理这些过程时存在尺度鸿沟：没有明确的概念来连接发生在陆地表面附近和在陆地表面发生交换过程的局部尺度，到适合描述和模拟大气环境中的这些输送的尺度，例如用涡旋协方差方法和公共边界层模式。该项目将通过一套不同的当地测量技术与边界层规模估计相结合的综合方法处理这一问题，范围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缩小刻度间隙的磁通室概念。

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.