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

Journal metrics

Journal metrics

  • IF value: 5.668 IF 5.668
  • IF 5-year value: 6.201 IF 5-year
    6.201
  • CiteScore value: 6.13 CiteScore
    6.13
  • SNIP value: 1.633 SNIP 1.633
  • IPP value: 5.91 IPP 5.91
  • SJR value: 2.938 SJR 2.938
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 174 Scimago H
    index 174
  • h5-index value: 87 h5-index 87
Preprints
https://doi.org/10.5194/acp-2019-742
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-742
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 17 Sep 2019

Submitted as: research article | 17 Sep 2019

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

Estimation of Cloud Condensation Nuclei number concentrations and comparison to in-situ and lidar observations during the HOPE experiments

Christa Genz1,a,*, Roland Schrödner1, Bernd Heinold1, Silvia Henning1, Holger Baars1, Gerald Spindler1, and Ina Tegen1 Christa Genz et al.
  • 1Leibniz Institute for Tropospheric Research (TROPOS), Permoserstraße 15, 04318 Leipzig, Germany
  • anow at: University of Leipzig, Institute for Meteorology (LIM), Stephanstraße 3, 04103 Leipzig, Germany
  • *previously published under the name Christa Engler

Abstract. Atmospheric aerosols are the precondition for the formation of cloud droplets and have thus large influence on the microphysical and radiative properties of clouds. In this work four different methods to derive potential cloud condensation nuclei (CCN) number concentrations were analyzed and compared: A model parameterization based on simulated particle concentrations, the same parameterization based on gravimetrical particle measurements, direct CCN measurements with a CCN counter at a certain observation site and lidar derived CCN profiles. In order to allow for sensitivity studies of the anthropogenic impact, a scenario for the maximum CCN concentration under peak aerosol conditions (1985) was estimated as well. In general, the simulations are in good agreement with the observation. At ground level, an average value of around 1 × 109 CCN/m3 at a supersaturation of 0.2 % was found with all methods. The discrimination of the chemical species revealed an almost equal contribution of ammonium sulfate and ammonium nitrate to the total number of potential CCN. This was not the case for the peak aerosol scenario, where almost no nitrate particles were formed. The potential activation at five different supersaturation values has been compared to the measurements. The discrepancies were lowest for the lowest and highest supersaturations, since chemical composition and the size distribution of the particles are less important in this range. In the mid supersaturation regime, the model overestimated the potentially activated particle fraction by around 30 %. The analysis of the modern (2013) and the peak aerosol scenario (1985) resulted in a scaling factor, which was defined as the quotient of the average vertical profile of the peak aerosol and present day CCN concentration. This factor was found to be around 2 close to the ground, increasing to around 3.5 between 2 and 5 km and approaching 1 (i.e., no difference between present day and peak aerosol conditions) with increasing height. By comparing the simulation with observed profiles, the vertical distribution of the potential CCN was found to be reasonable.

Christa Genz et al.

Interactive discussion

Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Login for Authors/Editors] [Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Christa Genz et al.

Christa Genz et al.

Viewed

Total article views: 420 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
304 108 8 420 5 10
  • HTML: 304
  • PDF: 108
  • XML: 8
  • Total: 420
  • BibTeX: 5
  • EndNote: 10
Views and downloads (calculated since 17 Sep 2019)
Cumulative views and downloads (calculated since 17 Sep 2019)

Viewed (geographical distribution)

Total article views: 362 (including HTML, PDF, and XML) Thereof 357 with geography defined and 5 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 30 May 2020
Publications Copernicus
Download
Short summary
Atmospheric aerosols are the precondition for the formation of cloud droplets and have thus large influence on cloud properties. In this work four different methods to derive potential cloud condensation nuclei (CCN) numbers were analyzed and compared. In order to allow for sensitivity studies of the anthropogenic impact, a scenario for the maximum CCN concentration under peak aerosol conditions was estimated as well. In general, the simulations are in good agreement with the observations.
Atmospheric aerosols are the precondition for the formation of cloud droplets and have thus...
Citation