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

该项目旨在利用埃格IOP 1&2期间的测量结果以及Weidenbrunnen/皆伐场地的现有基础设施，研究排水流量和（子）冠层平流效应。我们的目标是使用所观察到的湍流积分尺度，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，这项工作将扩展STANDFLUX模型从非反应活性痕量气体（分）冠层CO2，NO，NO2和O3浓度的三维模型估计。模拟的一维和三维湍流交换系数将被同化在冠层气体交换模式中。在这方面，项目的目标是a） 将现有的冠层气体交换模型STANDFLUX与由马克斯-普朗克化学研究所（MPIC）大气化学系开发的化学箱模型MECCA相结合，B） 利用埃格I数据，更好地了解（亚）冠层湍流的特性c） 将IOP 1和2数据库扩展到皆伐地和森林边缘，以研究有助于森林/皆伐地-大气二氧化碳、HONO和NO-NO2-O3三元组交换的现象。这些重点目标显然与Weidenbrunnen/皆伐地更广泛的努力相吻合，以了解该地区的交换过程。

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.