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Vaughan Phillips

Research in the Area of Clouds, Aerosols and Climate

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

Author

  • Sachin Patade
  • Deepak Waman
  • Akash Deshmukh
  • Ashok Kumar Gupta
  • Arti Jadav
  • Vaughan T.J. Phillips
  • Aaron Bansemer
  • Jacob Carlin
  • Alexander Ryzhkov

Summary, in English

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 cloud microphysical parameters are investigated. The changes in warm microphysical parameters, including liquid water content and cloud droplet number concentration, are minimal (<10 %). Overall, PBAPs have little effect on the ice number concentration (<6 %) in the convective region. In the stratiform region, increasing the initial PBAP loadings by a factor of 1000 resulted in less than 40 % change in ice number concentrations. The total ice concentration is mostly controlled by various mechanisms of secondary ice production (SIP). However, when SIP is intentionally shut down in sensitivity tests, increasing the PBAP loading by a factor of 100 has an effect of less than 3 % on the ice phase. Further sensitivity tests revealed that PBAPs have little effect on surface precipitation and on the shortwave and longwave flux (<4 %) for a 100-fold perturbation in PBAPs.

Department/s

  • Dept of Physical Geography and Ecosystem Science
  • MERGE: ModElling the Regional and Global Earth system
  • eSSENCE: The e-Science Collaboration

Publishing year

2022-09-16

Language

English

Pages

12055-12075

Publication/Series

Atmospheric Chemistry and Physics

Volume

22

Issue

18

Document type

Journal article

Publisher

Copernicus GmbH

Topic

  • Meteorology and Atmospheric Sciences

Status

Published

Project

  • Mechanisms for the Ice Nucleus Aerosols and their Indirect Effects: Cloud Modelling
  • Secondary ice production in simulated cloud-types
  • Mechanisms for the Influence from Ice Nucleus Aerosols on Clouds and their Indirect Effects: Cloud Modelling

ISBN/ISSN/Other

  • ISSN: 1680-7316