| Zugriffsnummer | 42382 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | No anomalous supersaturation in ultracold cirrus laboratory experiments |
| Autor(in); Institution |
Clouser, Benjamin W.; University of Chicago, Chicago, USA
Lamb, Kara D.; University of Chicago, Chicago, USA
Sarkozy, Laszlo; University of Chicago, Chicago, USA
Nisenoff, Alexandra; University of Chicago, Chicago, USA
Habig, Jan; Karlsruhe Institute of Technology, Karlsruhe, GERMANY
Ebert, Volker; 3.4, Analytische Chemie der Gasphase, PTB-Braunschweig
Saathoff, Harald; Karlsruhe Institute of Technology, Karlsruhe, GERMANY
Möhler, Ottmar; Karlsruhe Institute of Technology, Karlsruhe, GERMANY
Moyer, Elisabeth J.; University of Chicago, Chicago, USA
|
| Quelle/Jahr | Atmospheric Chemistry and Physics: 20 (2019), 2, 1089 - 1103 |
| Availability | [online only] |
| ISSN | 1680-7316 (PRINT) ; 1680-7324 (ONLINE) |
| DOI | |
| Verlag | Göttingen: Copernicus Publications |
| Zusammenfassung | High-altitude cirrus clouds are climatically important: their formation freeze-dries air ascending to the stratosphere to its final value, and their radiative impact is disproportionately large. However, their formation and growth are not fully understood, and multiple in-situ aircraft campaigns have observed frequent and persistent apparent water vapor supersaturations of 5 %-25 % in ultracold cirrus (T < 205 K), even in the presence of ice particles. A variety of explanations for these observations have been put forth, including that ultracold cirrus are dominated by metastable ice whose vapor pressure exceeds that of hexagonal ice. The 2013 IsoCloud campaign at the AIDA cloud and aerosol chamber allowed explicit testing of cirrus formation dynamics at these low temperatures. A series of 28 experiments allow robust estimation of the saturation vapor pressure over ice for temperatures between 189 and 235 K, with a variety of ice nucleating particles. Experiments are rapid enough (˜ 10 minutes) to allow detection of any metastable ice that may form, as the timescale for annealing to hexagonal ice is hours or longer over the whole experimental temperature range. We show that in all experiments, saturation vapor pressures are fully consistent with expected values for hexagonal ice and inconsistent with the highest values postulated for metastable ice, with no temperature-dependent deviations from expected saturation vapor pressure. If metastable ice forms in ultracold cirrus clouds, it appears to lack the defects and interfaces that are assumed to produce differences in vapor pressure from hexagonal ice. |
| Kostenfreier Zugang | Open Access Gold |
| Rechteinformation | CC BY 4.0 ; Creative Commons Attribution 4.0 License |
| Themenbereich der Metrologie | Metrologie in der Chemie und Stoffeigenschaften |
| Forschungsprojekt | International Collaboration in Chemistry: Development and application of a tuneable diode laser spectrometer for water isotope measurement and scientific studies during cloud simulation experiments in the AIDA chamber |
| Förderinformationen (1) |
Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829 Förderer ID Typ: ISNI Förderprogramm: DFG EB 235/4-1 Titel der Förderung: International Collaboration in Chemistry: Development and application of a tuneable diode laser spectrometer for water isotope measurement and scientific studies during cloud simulation experiments in the AIDA chamber Förderungsnummer: 181901664 URI der Förderung: http://gepris.dfg.de/gepris/projekt/181901664 |
Zitierung
Clouser, B. W., Lamb, K. D., Sarkozy, L., Nisenoff, A., Habig, J., Ebert, V., Saathoff, H., Möhler, O., & Moyer, E. J. (2019). No anomalous supersaturation in ultracold cirrus laboratory experiments. Atmospheric Chemistry and Physics, 20(2), 1089–1103. https://doi.org/10.5194/acp-2019-150