| Zugriffsnummer | 28602 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | The accommodation coefficient of water molecules on ice-cirrus cloud studies at the AIDA simulation chamber |
| Autor(in); Institution |
Skrotzki, J.; Karlsruhe Institute of Technology (KIT), Karlsruhe, GERMANY
Connolly, P.; University of Manchester, Manchester, UK
Schnaiter, M.; Karlsruhe Institute of Technology (KIT), Karlsruhe, GERMANY
Saathoff, H.; Karlsruhe Institute of Technology (KIT), Karlsruhe, GERMANY
Möhler, O.; Karlsruhe Institute of Technology (KIT), Karlsruhe, GERMANY
Wagner, R.; Karlsruhe Institute of Technology (KIT), Karlsruhe, GERMANY
Niemand, M.; Karlsruhe Institute of Technology (KIT), Karlsruhe, GERMANY
Ebert, Volker; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Leisner, T.; Karlsruhe Institute of Technology (KIT), Karlsruhe, GERMANY
|
| Quelle/Jahr | Atmospheric Chemistry and Physics:(2012), 13, 4451 - 4466 |
| ISSN | 1680-7316 (PRINT) ; 1680-7324 (ONLINE) |
| DOI | |
| Verlag | Göttingen: Copernicus Publ. |
| Zusammenfassung | Cirrus clouds and their impact on the Earth’s radiative budget are subjects of current research. The processes governing the growth of cirrus ice particles are central to the radiative properties of cirrus clouds. At temperatures relevant to cirrus clouds, the growth of ice crystals smaller than a few microns in size is strongly influenced by the accommodation coefficient of water molecules on ice,aice making this parameter relevant for cirrus cloud modeling. However, the experimentally determined magnitude of aice for cirrus temperatures is afflicted with uncertainties of almost three orders of magnitude and values for derived from cirrus cloud data lack significance so far. This has motivated dedicatedaice experiments at the cloud chamber AIDA (Aerosol Interactions and Dynamics in the Atmosphere) to determine in the cirrus-relevant temperature interval between and under realistic cirrus ice particle growth conditions. The experimantal data sets have been evaluated independently with two model approaches: the first relying on the newly developed model SIGMA (Simple Ice Growth Model for determining Alpha), the second one on an established model, ACPIM (Aerosol-Cloud-Precipitation Interaction Model). Within both approaches, a careful uncertainty analysis of the obtained values has been carried out for each AIDA experiment. The results show no significant dependence of aiceon temperature between 190 K and 235 K. In addition, we find no evidence for a dependence of aice on ice particle size or on water vapor supersaturation for ice particles smaller than 20 and supersaturations of up to 70%. The temperature averaged and combined result from both models is aice = 0.6 -0.4+0,4 which implies that aice may only exert a minor impact on cirrus clouds and their characteristics when compared to the assumption of aice=1 . Impact on prior calculations of cirrus cloud properties, e.g. in climate models, with aice typically chosen in the range 0.2-1 is thus expected to be negligible. In any case, we provide a well constrained aice which future cirrus model studies can rely on. |
| Kostenfreier Zugang | Open Access Gold |
| Rechteinformation | CC BY 3.0 ; Creative Commons Attribution 3.0 License |
Zitierung
Skrotzki, J., Connolly, P., Schnaiter, M., Saathoff, H., Möhler, O., Wagner, R., Niemand, M., Ebert, V., & Leisner, T. (2012). The accommodation coefficient of water molecules on ice-cirrus cloud studies at the AIDA simulation chamber. Atmospheric Chemistry and Physics, 4451–4466. https://doi.org/10.5194/acpd-12-24351-2012