Exchange processes in mountainous regions; Reactive trace gases and plant ecology

这些项目旨在利用Eger IOP1&2期间的测量结果和Wedenbrunnen/Clear Cut站点的现有基础设施，研究排水流量和(次)冠层平流效应。我们的目标是使用观测到的湍流积分尺度、通量以及重要标量(CO2、H2O、NO、NO2、O3)的水平梯度，这些标量是模拟冠层-大气交换的关键。为了更好地解释观测到的通量，这项工作将把STANDFLUX模型从非反应性微量气体扩展到反应性痕量气体，以用于(亚)冠层CO2、NO、NO2和O3浓度的3D模型估计。模拟的一维和三维湍流交换系数将被同化在一个冠层气体交换模式中。在这方面，项目目标是a)将现有的树冠气体交换模型STANDFLUX与由Max-Planck化学研究所(MPIC)大气化学部开发的化学盒模型Mecca相结合，b)利用Eger I数据以更好地了解(次)树冠湍流的特性c)将IOP1&2数据库扩展到砍伐空地和森林边缘，以研究有助于森林/空旷大气二氧化碳交换的现象，HONO，而NO-NO2-O3三元组，这些重点目标显然符合魏登布朗宁/Clear Cut地点了解该地区交换过程的更广泛的努力。

The projects aims to study the drainage flows and (sub)canopy advection effects by taking advantage of the measurements made during EGER IOP1&2 and the existing infrastructure at the Weidenbrunnen/clear cut site. Our ambition is to use the observed turbulent integral scales, fluxes as well as horizontal gradients of the important scalars (CO2, H2O, NO, NO2, O3) that are key to modeling canopy-atmosphere exchange. In order to better interpret observed fluxes, this work will extend the STANDFLUX model from non-reactive to reactive trace gases for 3D model estimates of (sub)canopy CO2, NO, NO2 and O3 concentrations. Modeled 1D and 3D turbulent exchange coefficients will be assimilated in a canopy gas exchange model. In this respect, the project goals are a) to couple the existing canopy gas exchange model STANDFLUX with the chemical box model MECCA developed by the Atmospheric Chemistry Department of the Max-Planck-Institute for Chemistry (MPIC),b) to exploit EGER I data to achieve better understanding of the properties of (sub)canopy turbulent flows c) to extend the IOP1 & 2 data bases to the clear cut site and forest edge to study phenomena that contribute to forest/clear cut-atmosphere exchange of carbon dioxide, HONO, and the NO-NO2-O3 triad These focused goals fit clearly into the wider effort at the Weidenbrunnen/clear cut site to understand exchange processes in the region.