 |
| Titel |
Bi-directional exchange of ammonia in a pine forest ecosystem – a model sensitivity analysis |
| VerfasserIn |
Alexander Moravek, Amy Hrdina, Jennifer Murphy |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250130042
|
| Publikation (Nr.) |
 EGU/EGU2016-10229.pdf |
|
|
|
|
|
| Zusammenfassung |
| Ammonia (NH3) is a key component in the global nitrogen cycle and of great importance for
atmospheric chemistry, neutralizing atmospheric acids and leading to the formation of aerosol
particles. For understanding the role of NH3 in both natural and anthropogenically influenced
environments, the knowledge of processes regulating its exchange between ecosystems and
the atmosphere is essential. A two-layer canopy compensation point model is used to evaluate
the NH3 exchange in a pine forest in the Colorado Rocky Mountains. The net flux comprises
the NH3 exchange of leaf stomata, its deposition to leaf cuticles and exchange with the
forest ground. As key parameters the model uses in-canopy NH3 mixing ratios as
well as leaf and soil emission potentials measured at the site in summer 2015. A
sensitivity analysis is performed to evaluate the major exchange pathways as well as the
model’s constraints. In addition, the NH3 exchange is examined for an extended
range of environmental conditions, such as droughts or varying concentrations of
atmospheric pollutants, in order to investigate their influence on the overall net exchange. |
|
|
|
|
|
|