 |
| Titel |
Sampling the chemical composition during the morning transition of the boundary layer with a Zeppelin |
| VerfasserIn |
Maarten Krol, Fred Bosveld, Laurens Ganzeveld, Jordi Vila, Roy Laurijsse, Dimitra Kalosynaki, Stefano Decesari, Thomas Mentel |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093102
|
| Publikation (Nr.) |
 EGU/EGU2014-7510.pdf |
|
|
|
|
|
| Zusammenfassung |
| During 2012, a zeppelin platform was used to sample the developing convective boundary layer in PEGASOS project. In the month of May the zeppelin was based in the Netherlands and performed measurements around the 200 m high Cabauw measurement tower. In July the air in the Po valley was sampled. The focus was on measurements during the morning transition: the conversion of a stably stratified boundary layer into a well-developed convective boundary layer in the afternoon. During the early morning hours, the measurement strategy was to alternatively sample the composition of the air above and below the height of the developing convective layer. In this way, the air that is entrained into the developing boundary layer has been characterized.
During this presentation, the focus will be on two “golden” days: May 27 around the Cabauw tower, and July 12 in the Po valley. The development of the convective layer will be characterized with a simple slab model that describes the growth of the convective boundary layer. Growth of the layer is driven by surface heating and influenced by the temperature inversion on top of the layer and the temperature lapse rate in the overlying atmosphere. We will show that such a simple model is generally able to simulate observed temperature and moisture profiles relatively well. As a next step, we add atmospheric photochemistry to the model, and drive the chemistry by emissions of nitrogen oxides and hydrocarbons, as well as by other boundary conditions. The aim of these simulations is to better understand the processes that determine the concentrations of e.g. ozone in the convective boundary layer. We will address the relative roles of chemistry, entrainment, advection, and surface deposition on the ozone budget, and will make use of measurements made by the zeppelin and surface observations to validate the model. |
|
|
|
|
|
|