Aerosol–stratocumulus interactions: towards a better process understanding using closures between observations and large eddy simulations

Abstract cm - 3 up to 1000 cm - 3. Different aerosol loadings affected supersaturation at the cloud base, and thus the size of aerosol particles activating to cloud droplets. Due to higher CDNC, the mean size of cloud droplets in the diurnal high aerosol case was lower. Thus, droplet evaporation in downdraughts affected more the observed CDNC at Puijo altitude compared to the low aerosol case. In addition, in the low aerosol case, the presence of large aerosol particles in the accumulation mode played a significant role in the droplet spectrum evolution as it promoted the drizzle formation through collision and coalescence processes. Also, during the event, the formation of ice particles was observed due to subzero temperature at the cloud top. Although the modelled number concentration of ice hydrometeors was too low to be directly measured, the retrieval of hydrometeor sedimentation velocities with cloud radar allowed us to assess the realism of modelled ice particles. The studied cases are presented in detail and can be further used by the cloud modellers to test and validate their models in a well-characterized modelling setup. We also provide recommendations on how increasing amount of information on aerosol properties could improve the understanding of processes affecting cloud droplet number and liquid water content in stratiform clouds.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Aerosol–stratocumulus interactions: towards a better process understanding using closures between observations and large eddy simulations ; volume:22 ; number:18 ; year:2022 ; pages:12417-12441 ; extent:25 ; Atmospheric chemistry and physics ; 22, Heft 18 (2022), 12417-12441 (gesamt 25)

Contributors, Places and Time

• Creator: Calderón, Silvia ; Tonttila, Juha ; Buchholz, Angela ; Joutsensaari, Jorma ; Komppula, Mika ; Leskinen, Ari ; Hao, Liqing ; Moisseev, Dmitri ; Pullinen, Iida ; Tiitta, Petri ; Xu, Jian ; Virtanen, Annele ; Kokkola, Harri ; Romakkaniemi, Sami

Further information

• DOI: 10.5194/acp-22-12417-2022
• URN: urn:nbn:de:101:1-2022092905241866574150
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:23 AM CEST