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Nitrous acid (HONO) source and sink processes in a disturbed forest ecosystem - interactions of heterogeneous chemistry and turbulent transport

受干扰的森林生态系统中的亚硝酸 (HONO) 源和汇过程 - 异质化学和湍流传输的相互作用

基本信息

批准号：
187047602
负责人：
Professor Dr. Andreas B. Held
金额：
--
依托单位：
Fachgebiet Umweltchemie und Luftreinhaltung
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/187047602?language=en
关键词：
Nitrous acid HONO source sink

项目摘要

Within this project, the complex interplay of source and sink processes of nitrous acid (HONO) will be studied in a disturbed forest ecosystem. In previous field experiments, a tight correlation of the atmospheric mixing ratios of HONO and NO2, the most probable precursor, was not observed, while the interaction of heterogeneous chemistry (with a strong dependence on humidity conditions) and turbulent transport was found to play a significant role. The proposed measurements extend the previous field measurements of HONO within the forest to a second contrasting site in a forest clear cut. New near-surface profile measurements of HONO, NO, NO2 and O3 within the lowest two meters above the ground both in the trunk space and the clear cut will contribute to an advanced assessment of the temporal evolution and spatial distribution of relevant HONO sources and sinks. The proposed research tasks are designed to fill the scientific gaps that became evident from analyzing HONO field data from our forest ecosystem research site. In particular, we aim at untangling interactions of heterogeneous chemistry (influenced by radiation and humidity conditions) and turbulent transport under different atmospheric coupling regimes. This project will also contribute to the fundamental understanding of turbulent transport in a disturbed forest ecosystem, and provide basic observational data to evaluate and enhance reactive trace gas modeling on the canopy scale.

在本项目范围内，将研究受干扰森林生态系统中亚硝酸源和汇过程的复杂相互作用。在以前的现场实验中，HONO和NO2，最可能的前体的大气混合比的紧密相关性，没有观察到，而非均相化学（具有很强的依赖于湿度条件）和湍流运输的相互作用被发现发挥了重要作用。建议的测量扩展了以前的实地测量HONO森林内的第二个对比网站在森林皆伐。新的近地表剖面测量HONO，NO，NO2和O3在最低的两米以上的地面无论是在树干空间和清除将有助于先进的时间演变和空间分布的相关HONO源和汇的评估。拟议的研究任务旨在填补科学空白，从我们的森林生态系统研究网站分析HONO现场数据变得明显。特别是，我们的目标是解开非均相化学（辐射和湿度条件的影响）和湍流运输在不同的大气耦合制度下的相互作用。该项目还将有助于从根本上了解扰动森林生态系统中的湍流输送，并提供基本的观测数据，以评估和加强冠层尺度上的活性痕量气体建模。