Reactive nitrogen fluxes over peatland (Bourtanger Moor) and forest (Bavarian Forest National Park) using micrometeorological measurement techniques

Within the framework of the research projects NITROSPHERE and FORESTFLUX, field campaigns were carried out to investigate the biosphere-atmosphere exchange of reactive nitrogen compounds. We applied novel fast-response instruments in eddy-covariance setups for continuous determination of surface ammonia (NH₃) and total reactive nitrogen (\(\Sigma\)N_r) fluxes using two different analytical devices. While high-frequency measurements of ammonia were measured with a quantum cascade laser absorption spectrometer (QCL), a custom-built converter called TRANC coupled to a chemiluminescence detector was used for the determination of total reactive nitrogen. High-resolution data of surface-atmosphere fluxes of reactive compounds are still scarce, but highly desired for testing and validating local inferential and larger scale models. We provide access to campaign data including concentrations, fluxes and ancillary measurements of meteorological data. Campaigns were conducted in natural (forest) and semi-natural (peatland) ecosystem types. The published datasets stress the importance of recent advancements in laser spectrometry and help improve our understanding of the temporal variability of surface-atmosphere exchange in different ecosystems, thereby providing validation opportunities for inferential models simulating the exchange of reactive nitrogen.本数据集依托NITROSPHERE与FORESTFLUX两项研究项目的框架，通过野外实地观测实验探究生物圈与大气间活性氮化合物的交换过程。研究采用涡度相关法（eddy-covariance）观测装置中的新型快速响应仪器，依托两套不同分析设备，实现地表氨（NH₃）与总活性氮（ΣNᵣ）通量的连续测定。 其中，氨的高频观测采用量子级联激光吸收光谱仪（quantum cascade laser absorption spectrometer，QCL）完成；总活性氮的测定则借助一款名为TRANC的定制化转换器，搭配化学发光检测器（chemiluminescence detector）实现。 目前，地表-大气间活性化合物通量的高分辨率数据仍较为稀缺，但此类数据对于检验与验证局地推估模型及大尺度模型具有极高需求。 本数据集开放本次观测实验的相关数据，涵盖浓度、通量及气象辅助观测数据。实验分别在自然（森林）与半自然（泥炭地）生态系统类型中开展。 本已发表的数据集凸显了激光光谱技术近期进展的重要价值，有助于深化我们对不同生态系统中地表-大气交换过程时间变异性的认知，同时为模拟活性氮交换的推估模型提供了验证契机。