Effects of entrainment and mixing on the Wegener-Bergeron-Findeisen process

Hoffmann, Fabian

doi:10.1175/JAS-D-19-0289.1

Advanced Search

Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

Advanced Search
Custom Query

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Effects of entrainment and mixing on the Wegener-Bergeron-Findeisen process

2020
By Hoffmann, Fabian
Source: Journal of the Atmospheric Sciences, 77(6), 2279-2296.

[PDF-2.13 MB]

Details Related Documents You May Also Like

Details:

Journal Title:

Journal of Atmospheric Sciences
Personal Author:

Hoffmann, Fabian
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CSL (Chemical Sciences Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences)

OAR (Oceanic and Atmospheric Research) ; CSL (Chemical Sciences Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) Less -
Description:

The growth of ice crystals at the expense of water droplets, the Wegener–Bergeron–Findeisen (WBF) process, is of major importance for the production of precipitation in mixed-phase clouds. The effects of entrainment and mixing on WBF, however, are not well understood, and small-scale inhomogeneities in the thermodynamic and hydrometeor fields are typically neglected in current models. By applying the linear eddy model, a millimeter-resolution representation of turbulent deformation and molecular diffusion, we investigate these small-scale effects on WBF. While we show that entrainment is accelerating WBF by contributing to the evaporation of liquid droplets, entrainment may also cause aforementioned inhomogeneities, particularly regions filled with exclusively ice or liquid hydrometeors, which tend to decelerate WBF if the ice crystal concentration exceeds 100 L−1. At lower ice crystal concentrations, even weak turbulence can homogenize hydrometeor and thermodynamic fields sufficiently fast so as to not affect WBF. Independent of the ice crystal concentration, it is shown that a fully resolved entrainment and mixing process may delay the nucleation of entrained aerosols to ice crystals, thereby delaying the uptake of water vapor by the ice phase, further slowing down WBF. All in all, this study indicates that, under specific conditions, small-scale inhomogeneities associated with entrainment and mixing counteract the accelerated WBF in entraining clouds. However, further research is required to assess the importance of the newly discovered processes more broadly in fully coupled, evolving mixed-phase cloud systems.
Keywords:

[+]

Cloud Microphysics Clouds Turbulence
Source:

Journal of the Atmospheric Sciences, 77(6), 2279-2296.
DOI:

https://doi.org/10.1175/JAS-D-19-0289.1
Document Type:

Journal Article
Rights Information:

Other
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:e103b14986ba2c6581a5fd85553fe69942f04424af934e17b415093ec10b779a
Download URL:

https://repository.library.noaa.gov/view/noaa/29412/noaa_29412_DS1.pdf
File Type:

No Additional Files

More +

Effects of entrainment and mixing on the Wegener-Bergeron-Findeisen process

Details:

Supporting Files

Related Documents

You May Also Like