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Effects of solid aerosols on partially glaciated clouds

Kudzotsa, Innocent LU ; Phillips, Vaughan T.J. LU and Dobbie, Steven (2018) In Quarterly Journal of the Royal Meteorological Society 144(717). p.2634-2649
Abstract

Sensitivity tests were conducted using a state-of-the-art aerosol–cloud to investigate the key microphysical and dynamical mechanisms by which solid aerosols affect glaciated clouds. The tests involved simulations of two contrasting cases of deep convection—a tropical maritime case and a midlatitude continental case, in which solid aerosol concentrations were increased from their pre-industrial (1850) to their present-day (2010) levels. In the midlatitude continental case, the boosting of the number concentrations of solid aerosols weakened the updrafts in deep convective clouds, resulting in reduced snow and graupel production. Consequently, the cloud fraction and the cloud optical thickness increased with increasing ice nuclei (IN),... (More)

Sensitivity tests were conducted using a state-of-the-art aerosol–cloud to investigate the key microphysical and dynamical mechanisms by which solid aerosols affect glaciated clouds. The tests involved simulations of two contrasting cases of deep convection—a tropical maritime case and a midlatitude continental case, in which solid aerosol concentrations were increased from their pre-industrial (1850) to their present-day (2010) levels. In the midlatitude continental case, the boosting of the number concentrations of solid aerosols weakened the updrafts in deep convective clouds, resulting in reduced snow and graupel production. Consequently, the cloud fraction and the cloud optical thickness increased with increasing ice nuclei (IN), causing a negative radiative flux change at the top of the atmosphere (TOA), that is, a cooling effect of −1.96 ± 0.29 W/m2. On the other hand, in the tropical maritime case, increased ice nuclei invigorated upper-tropospheric updrafts in both deep convective and stratiform clouds, causing cloud tops to shift upwards. Snow production was also intensified, resulting in reduced cloud fraction and cloud optical thickness, hence a positive radiative flux change at the TOA—a warming effect of 1.02 ± 0.36 W/m2 was predicted.

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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
aerosol–cloud interactions, cloud microphysics, cloud-resolving models, clouds, glaciated clouds, indirect effects
in
Quarterly Journal of the Royal Meteorological Society
volume
144
issue
717
pages
16 pages
publisher
Royal Meteorological Society
external identifiers
  • scopus:85058536082
ISSN
0035-9009
DOI
10.1002/qj.3376
language
English
LU publication?
yes
id
ce52f5cd-6d89-48cd-a8ac-23946ed02782
date added to LUP
2019-01-04 14:10:58
date last changed
2019-03-08 02:52:08
@article{ce52f5cd-6d89-48cd-a8ac-23946ed02782,
  abstract     = {<p>Sensitivity tests were conducted using a state-of-the-art aerosol–cloud to investigate the key microphysical and dynamical mechanisms by which solid aerosols affect glaciated clouds. The tests involved simulations of two contrasting cases of deep convection—a tropical maritime case and a midlatitude continental case, in which solid aerosol concentrations were increased from their pre-industrial (1850) to their present-day (2010) levels. In the midlatitude continental case, the boosting of the number concentrations of solid aerosols weakened the updrafts in deep convective clouds, resulting in reduced snow and graupel production. Consequently, the cloud fraction and the cloud optical thickness increased with increasing ice nuclei (IN), causing a negative radiative flux change at the top of the atmosphere (TOA), that is, a cooling effect of −1.96 ± 0.29 W/m<sup>2</sup>. On the other hand, in the tropical maritime case, increased ice nuclei invigorated upper-tropospheric updrafts in both deep convective and stratiform clouds, causing cloud tops to shift upwards. Snow production was also intensified, resulting in reduced cloud fraction and cloud optical thickness, hence a positive radiative flux change at the TOA—a warming effect of 1.02 ± 0.36 W/m<sup>2</sup> was predicted.</p>},
  author       = {Kudzotsa, Innocent and Phillips, Vaughan T.J. and Dobbie, Steven},
  issn         = {0035-9009},
  keyword      = {aerosol–cloud interactions,cloud microphysics,cloud-resolving models,clouds,glaciated clouds,indirect effects},
  language     = {eng},
  number       = {717},
  pages        = {2634--2649},
  publisher    = {Royal Meteorological Society},
  series       = {Quarterly Journal of the Royal Meteorological Society},
  title        = {Effects of solid aerosols on partially glaciated clouds},
  url          = {http://dx.doi.org/10.1002/qj.3376},
  volume       = {144},
  year         = {2018},
}