11 Jan 2022

11 Jan 2022

Review status: this preprint is currently under review for the journal ACP.

The influence of multiple groups of biological ice nucleating particles on microphysical properties of mixed-phase clouds observed during MC3E

Sachin Patade1, Vaughan Phillips1, Deepak Waman1, Akash Deshmukh1, Ashok Kumar Gupta2, Arti Jadav1, Aaron Bansemer4, Jacob Carlin3, and Alexander Ryzhkov3 Sachin Patade et al.
  • 1Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden
  • 2Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN, 37240, USA
  • 3Cooperative Institute for Severe and High-Impact Weather Research and Operations, The University of Oklahoma, and NOAA/OAR National Severe Storms Laboratory, Norman, Oklahoma, USA
  • 4National Center for Atmospheric Research, Boulder, Colorado, USA

Abstract. A new empirical parameterization (EP) for multiple groups of primary biological aerosol particles (PBAPs) is implemented in the aerosol cloud model (AC) to investigate their roles as ice-nucleating particles (INPs). The EP describes the heterogeneous ice nucleation by (1) fungal spores, (2) bacteria, (3) pollen, (4) detritus of plants, animals, and viruses, and (5) algae. Each group includes fragments from the originally emitted particles. A high-resolution simulation of a midlatitude mesoscale squall line by AC is validated against airborne and ground observations.

Sensitivity tests are carried out by varying the initial vertical profiles of the loadings of individual PBAP groups. The resulting changes in warm and ice microphysical parameters are investigated. Overall, PBAPs have little effect on the ice phase, especially in the convective region. In the stratiform region, increasing the initial PBAP loadings by a factor of 100 resulted in less than 60 % change in ice number concentrations. The total ice concentration is mostly controlled by various mechanisms of secondary ice production (SIP). However, when SIP is artificially prohibited in sensitivity tests, increasing the PBAP loading by a factor of 100 has no significant effect on the ice phase. Further sensitivity tests revealed that PBAPs have little effect on surface precipitation as well as on shortwave and longwave flux.

Sachin Patade et al.

Status: open (until 22 Feb 2022)

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

Sachin Patade et al.

Sachin Patade et al.


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Short summary
The modeling study focuses on the role of multiple groups of primary biological aerosol particles as ice nuclei on cloud properties and precipitation. This was done by implementing a more realistic scheme for biological ice nucleating particles in the aerosol cloud model. Results show that biological ice nucleating particles have a limited role in altering the ice phase and precipitation in deep convective clouds.