Preprints
https://doi.org/10.5194/acp-2022-529
https://doi.org/10.5194/acp-2022-529
 
04 Aug 2022
04 Aug 2022
Status: this preprint is currently under review for the journal ACP.

A global climatology of ice nucleating particles at cirrus conditions derived from model simulations with EMAC-MADE3

Christof Gerhard Beer, Johannes Hendricks, and Mattia Righi Christof Gerhard Beer et al.
  • Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany

Abstract. Atmospheric aerosols can act as ice nucleating particles (INPs) and thereby influence the formation and the microphysical properties of cirrus clouds resulting in distinct climate modifications. From laboratory experiments several types of aerosol particles have been identified as effective INPs at cirrus conditions. However, the global atmospheric distribution of INPs in the cirrus regime is still highly uncertain as in situ observations are scarce and limited in space and time. To study the influence of INPs on cirrus clouds and climate on the global scale these particles have been simulated with global chemistry-climate models. Typically, mineral dust and soot particles, which are known to initiate ice nucleation in cirrus clouds, have been considered in these models. In addition, laboratory studies suggest crystalline ammonium sulfate and glassy organic particles as effective INPs in the cirrus regime. However, the representation of these particles in global models is challenging as their phase state, i.e. crystalline or glassy, needs to be simulated. In turn, crystalline ammonium sulfate and glassy organics have only rarely been considered in global model studies and their impact on the global scale is still uncertain. Here, we present and analyse a global climatology of INPs derived from global model simulations performed with the ECHAM/MESSy Atmospheric Chemistry (EMAC) general circulation model including the aerosol microphysics submodel MADE3 (Modal Aerosol Dynamics model for Europe, adapted for global applications, third generation) coupled to a two-moment cloud microphysical scheme and a parametrization for aerosol-induced ice formation in cirrus clouds. This global INP-climatology comprises mineral dust and soot particles, as well as crystalline ammonium sulfate and glassy organics, including a simplified formulation of the particle phase state for the latter. By coupling the different INP-types to the microphysical cirrus cloud scheme, their ice nucleation potential at cirrus conditions is analysed, considering possible competition mechanisms between different INPs. The simulated INP concentrations in the range of about 1 to 100 L−1 agree well with in situ observations and other global model studies. We show that INP concentrations of glassy organics and crystalline ammonium sulfate are strongly related to the ambient conditions which often inhibit the glassy or crystalline phase, respectively. Our model results suggest that glassy organic particles probably have only minor influence, as typical INP concentrations are mostly low in the cirrus regime. On the other hand, crystalline ammonium sulfate often shows large INP concentrations, has the potential to influence ice nucleation in cirrus clouds, and should be taken into account in future model applications.

Christof Gerhard Beer et al.

Status: open (until 15 Sep 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Christof Gerhard Beer et al.

Data sets

Model simulation data used in "A global climatology of ice nucleating particles at cirrus conditions derived from model simulations with EMAC-MADE3" (Beer et al., Atmos. Chem. Phys., 2022) Christof G. Beer http://doi.org/10.5281/zenodo.6834299

Christof Gerhard Beer et al.

Viewed

Total article views: 145 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
110 32 3 145 12 1 2
  • HTML: 110
  • PDF: 32
  • XML: 3
  • Total: 145
  • Supplement: 12
  • BibTeX: 1
  • EndNote: 2
Views and downloads (calculated since 04 Aug 2022)
Cumulative views and downloads (calculated since 04 Aug 2022)

Viewed (geographical distribution)

Total article views: 143 (including HTML, PDF, and XML) Thereof 143 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 08 Aug 2022
Download
Short summary
Ice nucleating aerosol particles (INPs) have important influences on cirrus clouds and the climate system. However, their global atmospheric distribution in the cirrus regime is still very uncertain. We present a global climatology of INPs at cirrus conditions derived from model simulations, considering the INP-types mineral dust, soot, crystalline ammonium sulfate and glassy organics. The comparison of respective INP concentrations indicates a large importance of ammonium sulfate particles.
Altmetrics