Bitte benutzen Sie diese Kennung, um auf die Ressource zu verweisen: https://doi.org/10.21256/zhaw-3312
Publikationstyp: Beitrag in wissenschaftlicher Zeitschrift
Art der Begutachtung: Peer review (Publikation)
Titel: Pore condensation and freezing is responsible for ice formation below water saturation for porous particles
Autor/-in: David, Robert O.
Marcolli, Claudia
Fahrni, Jonas
Qiu, Yuqing
Perez Sirkin, Yamila A.
Molinero, Valeria
Mahrt, Fabian
Brühwiler, Dominik
Lohmann, Ulrike
Kanji, Zamin A.
DOI: 10.21256/zhaw-3312
10.1073/pnas.1813647116
Erschienen in: Proceedings of the National Academy of Sciences of the United States of America
Band(Heft): 116
Heft: 17
Seite(n): 8184
Seiten bis: 8189
Erscheinungsdatum: 2019
Verlag / Hrsg. Institution: National Academy of Sciences
ISSN: 0027-8424
1091-6490
Sprache: Englisch
Schlagwörter: Cirrus; Cloud; Deposition nucleation; Ice nucleation; Pore condensation and freezing
Fachgebiet (DDC): 551: Geologie und Hydrologie
Zusammenfassung: Ice nucleation in the atmosphere influences cloud properties, altering precipitation and the radiative balance, ultimately regulating Earth's climate. An accepted ice nucleation pathway, known as deposition nucleation, assumes a direct transition of water from the vapor to the ice phase, without an intermediate liquid phase. However, studies have shown that nucleation occurs through a liquid phase in porous particles with narrow cracks or surface imperfections where the condensation of liquid below water saturation can occur, questioning the validity of deposition nucleation. We show that deposition nucleation cannot explain the strongly enhanced ice nucleation efficiency of porous compared with nonporous particles at temperatures below -40 °C and the absence of ice nucleation below water saturation at -35 °C. Using classical nucleation theory (CNT) and molecular dynamics simulations (MDS), we show that a network of closely spaced pores is necessary to overcome the barrier for macroscopic ice-crystal growth from narrow cylindrical pores. In the absence of pores, CNT predicts that the nucleation barrier is insurmountable, consistent with the absence of ice formation in MDS. Our results confirm that pore condensation and freezing (PCF), i.e., a mechanism of ice formation that proceeds via liquid water condensation in pores, is a dominant pathway for atmospheric ice nucleation below water saturation. We conclude that the ice nucleation activity of particles in the cirrus regime is determined by the porosity and wettability of pores. PCF represents a mechanism by which porous particles like dust could impact cloud radiative forcing and, thus, the climate via ice cloud formation.
URI: https://digitalcollection.zhaw.ch/handle/11475/16910
Volltext Version: Publizierte Version
Lizenz (gemäss Verlagsvertrag): CC BY-NC-ND 4.0: Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International
Departement: Life Sciences und Facility Management
Organisationseinheit: Institut für Chemie und Biotechnologie (ICBT)
Publiziert im Rahmen des ZHAW-Projekts: Untersuchung der Eisbildungsmechanismen in der Atmosphäre
Enthalten in den Sammlungen:Publikationen Life Sciences und Facility Management

Dateien zu dieser Ressource:
Datei Beschreibung GrößeFormat 
8184.full.pdf1.47 MBAdobe PDFMiniaturbild
Öffnen/Anzeigen
Zur Langanzeige
David, R. O., Marcolli, C., Fahrni, J., Qiu, Y., Perez Sirkin, Y. A., Molinero, V., Mahrt, F., Brühwiler, D., Lohmann, U., & Kanji, Z. A. (2019). Pore condensation and freezing is responsible for ice formation below water saturation for porous particles. Proceedings of the National Academy of Sciences of the United States of America, 116(17), 8184–8189. https://doi.org/10.21256/zhaw-3312
David, R.O. et al. (2019) ‘Pore condensation and freezing is responsible for ice formation below water saturation for porous particles’, Proceedings of the National Academy of Sciences of the United States of America, 116(17), pp. 8184–8189. Available at: https://doi.org/10.21256/zhaw-3312.
R. O. David et al., “Pore condensation and freezing is responsible for ice formation below water saturation for porous particles,” Proceedings of the National Academy of Sciences of the United States of America, vol. 116, no. 17, pp. 8184–8189, 2019, doi: 10.21256/zhaw-3312.
DAVID, Robert O., Claudia MARCOLLI, Jonas FAHRNI, Yuqing QIU, Yamila A. PEREZ SIRKIN, Valeria MOLINERO, Fabian MAHRT, Dominik BRÜHWILER, Ulrike LOHMANN und Zamin A. KANJI, 2019. Pore condensation and freezing is responsible for ice formation below water saturation for porous particles. Proceedings of the National Academy of Sciences of the United States of America. 2019. Bd. 116, Nr. 17, S. 8184–8189. DOI 10.21256/zhaw-3312
David, Robert O., Claudia Marcolli, Jonas Fahrni, Yuqing Qiu, Yamila A. Perez Sirkin, Valeria Molinero, Fabian Mahrt, Dominik Brühwiler, Ulrike Lohmann, and Zamin A. Kanji. 2019. “Pore Condensation and Freezing Is Responsible for Ice Formation below Water Saturation for Porous Particles.” Proceedings of the National Academy of Sciences of the United States of America 116 (17): 8184–89. https://doi.org/10.21256/zhaw-3312.
David, Robert O., et al. “Pore Condensation and Freezing Is Responsible for Ice Formation below Water Saturation for Porous Particles.” Proceedings of the National Academy of Sciences of the United States of America, vol. 116, no. 17, 2019, pp. 8184–89, https://doi.org/10.21256/zhaw-3312.


Alle Ressourcen in diesem Repository sind urheberrechtlich geschützt, soweit nicht anderweitig angezeigt.