Turbulent activation of cloud condensation nuclei

This dataset contains selected codes and data from simulations investigating the impact of cloud-base turbulence on activation of cloud condensation nuclei (CCN). Activation of two monodisperse CCN are studied within an adiabatic parcel rising through the cloud base and filled with homogeneous isotropic turbulence. We apply a forced implicit large eddy simulation methodology (Grabowski and Thomas Atmospheric Chemistry and Physics, 2021) within a triply periodic computational domain of 64^3 m^3. Small CCN are assumed to have a dry radius of 0.01 micron and a corresponding activation (critical) radius and activation supersaturation of 0.6 micron and 1.3%, respectively. Large CCN have a dry radius of 0.2 micron and feature activation radius of 5.4 micron and activation supersaturation 0.15 %. CCN are assumed in 200 cm^-3 concentration in all cases. Mean cloud base updraft velocities of 0.33, 1, and 3 m/s are considered. Turbulence can lead to activation of only a fraction of all CCN and lead to a non-zero droplet spectral width just above the cloud base, of the order of 1 micron, especially in the case of small CCN and weak mean cloud base ascent. The simulations document an important role of cloud base turbulence on cloud base CCN activation.

To Access Resource:

Questions? Email Resource Support Contact:

  • Wojciech Grabowski
    UCAR/NCAR - Mesoscale and Microscale Meteorology Laboratory


Resource Type dataset
Temporal Range Begin N/A
Temporal Range End N/A
Temporal Resolution N/A
Bounding Box North Lat N/A
Bounding Box South Lat N/A
Bounding Box West Long N/A
Bounding Box East Long N/A
Spatial Representation N/A
Spatial Resolution N/A
Related Links N/A
Additional Information N/A
Resource Format application/octet-stream
Standardized Resource Format Binary
Asset Size N/A
Legal Constraints

Creative Commons Attribution 4.0 International License.

Access Constraints None
Software Implementation Language N/A

Resource Support Name Wojciech Grabowski
Resource Support Email grabow@ucar.edu
Resource Support Organization UCAR/NCAR - Mesoscale and Microscale Meteorology Laboratory
Distributor N/A
Metadata Contact Name GDEX Curator
Metadata Contact Email datahelp@ucar.edu
Metadata Contact Organization UCAR/NCAR - GDEX

Author Grabowski, Wojciech W.
Publisher UCAR/NCAR - GDEX
Publication Date 2021-07-14
Digital Object Identifier (DOI) https://doi.org/10.5065/z9wk-1x22
Alternate Identifier N/A
Resource Version N/A
Topic Category N/A
Progress N/A
Metadata Date 2022-07-21T12:26:43-06:00
Metadata Record Identifier edu.ucar.gdex::9676eeec-373c-4fb1-a53d-c8dd1e1200fa
Metadata Language eng; USA
Suggested Citation Grabowski, Wojciech W.. (2021). Turbulent activation of cloud condensation nuclei. UCAR/NCAR - GDEX. https://doi.org/10.5065/z9wk-1x22. Accessed 22 September 2023.

Harvest Source