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Modeled aerosol-cloud indirect effects and processes based on an observed partially glaciated marine deep convective cloud case

Kudzotsa, Innocent LU ; Dobbie, Steven and Phillips, Vaughan LU (2019) In Atmospheric Environment 204. p.12-21
Abstract


A tropical maritime case of deep convective clouds was studied using a state-of-the-art aerosol-cloud model in order to evaluate the microphysical mechanisms of aerosol indirect effects (AIE). The aerosol-cloud scheme used is a hybrid bin/bulk model, which treats all phases of clouds and precipitation allowing a detailed analysis of process-level aerosol indirect effects on targeted cloud types. From the simulations, a substantially huge total AIE on maritime clouds of −17.44 ± 6.1 Wm
−2
was predicted primarily because maritime clouds are... (More)


A tropical maritime case of deep convective clouds was studied using a state-of-the-art aerosol-cloud model in order to evaluate the microphysical mechanisms of aerosol indirect effects (AIE). The aerosol-cloud scheme used is a hybrid bin/bulk model, which treats all phases of clouds and precipitation allowing a detailed analysis of process-level aerosol indirect effects on targeted cloud types. From the simulations, a substantially huge total AIE on maritime clouds of −17.44 ± 6.1 Wm
−2
was predicted primarily because maritime clouds are highly sensitive to perturbations in aerosol concentrations because of their low background aerosol concentrations. This was evidenced by the conspicuous increases in droplet and ice number concentrations and the subsequent reductions in particle mean sizes in the present-day. Both the water-only (−9.08 ± 3.18 Wm
−2
) and the partially glaciated clouds (−8.36 ± 2.93 Wm
−2
) contributed equally to the net AIE of these maritime clouds. As for the partially glaciated clouds, the mixed-phase component (−14.12 ± 4.94 Wm
−2
) of partially glaciated clouds was dominant, whilst the ice-only component (5.76 ± 1.84 Wm
−2
) actually exhibited a positive radiative forcing at the top of the atmosphere (TOA). This was primarily because ice water contents aloft were diminished significantly owing to increased snow production in the present-day.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aerosol-cloud interactions, Atmospheric modelling, Cloud microphysics, Partially glaciated clouds, WRF model
in
Atmospheric Environment
volume
204
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85061835292
ISSN
1352-2310
DOI
10.1016/j.atmosenv.2019.02.010
language
English
LU publication?
yes
id
0260f800-0f86-492c-b2e4-16b0825b71ba
date added to LUP
2019-03-01 10:54:36
date last changed
2019-03-27 04:39:28
@article{0260f800-0f86-492c-b2e4-16b0825b71ba,
  abstract     = {<p><br>
                                                         A tropical maritime case of deep convective clouds was studied using a state-of-the-art aerosol-cloud model in order to evaluate the microphysical mechanisms of aerosol indirect effects (AIE). The aerosol-cloud scheme used is a hybrid bin/bulk model, which treats all phases of clouds and precipitation allowing a detailed analysis of process-level aerosol indirect effects on targeted cloud types. From the simulations, a substantially huge total AIE on maritime clouds of −17.44 ± 6.1 Wm                             <br>
                            <sup>−2</sup><br>
                                                          was predicted primarily because maritime clouds are highly sensitive to perturbations in aerosol concentrations because of their low background aerosol concentrations. This was evidenced by the conspicuous increases in droplet and ice number concentrations and the subsequent reductions in particle mean sizes in the present-day. Both the water-only (−9.08 ± 3.18 Wm                             <br>
                            <sup>−2</sup><br>
                                                         ) and the partially glaciated clouds (−8.36 ± 2.93 Wm                             <br>
                            <sup>−2</sup><br>
                                                         ) contributed equally to the net AIE of these maritime clouds. As for the partially glaciated clouds, the mixed-phase component (−14.12 ± 4.94 Wm                             <br>
                            <sup>−2</sup><br>
                                                         ) of partially glaciated clouds was dominant, whilst the ice-only component (5.76 ± 1.84 Wm                             <br>
                            <sup>−2</sup><br>
                                                         ) actually exhibited a positive radiative forcing at the top of the atmosphere (TOA). This was primarily because ice water contents aloft were diminished significantly owing to increased snow production in the present-day.                         <br>
                        </p>},
  author       = {Kudzotsa, Innocent and Dobbie, Steven and Phillips, Vaughan},
  issn         = {1352-2310},
  keyword      = {Aerosol-cloud interactions,Atmospheric modelling,Cloud microphysics,Partially glaciated clouds,WRF model},
  language     = {eng},
  pages        = {12--21},
  publisher    = {Elsevier},
  series       = {Atmospheric Environment},
  title        = {Modeled aerosol-cloud indirect effects and processes based on an observed partially glaciated marine deep convective cloud case},
  url          = {http://dx.doi.org/10.1016/j.atmosenv.2019.02.010},
  volume       = {204},
  year         = {2019},
}