Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 5.414
IF5.414
IF 5-year value: 5.958
IF 5-year
5.958
CiteScore value: 9.7
CiteScore
9.7
SNIP value: 1.517
SNIP1.517
IPP value: 5.61
IPP5.61
SJR value: 2.601
SJR2.601
Scimago H <br class='widget-line-break'>index value: 191
Scimago H
index
191
h5-index value: 89
h5-index89
Preprints
https://doi.org/10.5194/acp-2020-781
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-781
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  13 Aug 2020

13 Aug 2020

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

The effect of biological particles and their ageing processes on aerosol radiative properties: Model sensitivity studies

Minghui Zhang, Amina Khaled, Pierre Amato, Anne-Marie Delort, and Barbara Ervens Minghui Zhang et al.
  • Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand, 63000 Clermont-Ferrand, France

Abstract. Biological aerosol particles (BAPs) such as bacteria, viruses, fungi and pollen, represent a small fraction of the total aerosol burden. However due to their unique properties, they have been suggested to be important in for radiative forcing by the aerosol direct and indirect effects. By means of process model studies, we compare the sensitivity of these radiative effects to various physicochemical BAP properties (e.g. number concentration, diameter, hygroscopicity, surface tension, contact angle between ice and particles). Exceeding previous sensitivity studies, we explore not only the variability of these properties among different BAP types, but also the extent to which chemical (e.g. nitration), physical (e.g. fragmentation) and biological (e.g. bacteria cell generation) ageing processes of BAPs can modify these properties. Our model results lead to a ranking of the various properties for the radiative effects: (i) Given that BAPs contribute ~ 0.1 % to total cloud condensation nuclei (CCN) number concentration, their effect on total CCN is likely small. (ii) BAPs number fraction of large particles (diameter > ~ 0.5 μm) is much higher, resulting in a relatively more important effect on direct radiative forcing. (iii) In mixed-phase clouds at T > −10 °C, BAPs can contribute ~ 100 % to ice nuclei (IN), which makes their role as IN the most important. Our study highlights the need of implementing ageing processes of different BAPs into models as BAP size, CCN and IN activity and optical properties may be sufficiently altered to affect BAP's residence time and survival in the atmosphere. In particular, we suggest the potential role of biological processes, that are currently not included in aerosol models due to the sparsity of comprehensive data, could affect physicochemical BAP properties.

Minghui Zhang et al.

Interactive discussion

Status: open (until 08 Oct 2020)
Status: open (until 08 Oct 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Minghui Zhang et al.

Minghui Zhang et al.

Viewed

Total article views: 99 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
67 30 2 99 2 2
  • HTML: 67
  • PDF: 30
  • XML: 2
  • Total: 99
  • BibTeX: 2
  • EndNote: 2
Views and downloads (calculated since 13 Aug 2020)
Cumulative views and downloads (calculated since 13 Aug 2020)

Viewed (geographical distribution)

Total article views: 114 (including HTML, PDF, and XML) Thereof 114 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 29 Sep 2020
Publications Copernicus
Download
Short summary
Biological aerosol particles (BAP) represent a small fraction of total atmospheric aerosol burden. They attracted attention due to their role for climate and public health. Our study summarizes which BAP properties are important to affect their inclusion in clouds and interaction with light and might also affect their residence time and transport in the atmosphere. Our study highlights that not only chemical and physical but also biological processes can modify these physicochemical properties.
Biological aerosol particles (BAP) represent a small fraction of total atmospheric aerosol...
Citation
Altmetrics