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Interactions between aerosol absorption, thermodynamics, dynamics, and microphysics and their impacts on a multiple-cloud system

Title
Interactions between aerosol absorption, thermodynamics, dynamics, and microphysics and their impacts on a multiple-cloud system
Authors
Lee S.S.Li Z.Mok J.Ahn M.-H.Kim B.-G.Choi Y.-S.Jung C.-H.Yoo H.L.
Ewha Authors
최용상안명환
SCOPUS Author ID
최용상scopus; 안명환scopus
Issue Date
2017
Journal Title
Climate Dynamics
ISSN
0930-7575JCR Link
Citation
vol. 49, no. 43416.0, pp. 3905 - 3921
Keywords
AerosolEvaporationGust frontMesoscale convective systemStability
Publisher
Springer Verlag
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
This study investigates how the increasing concentration of black carbon aerosols, which act as radiation absorbers as well as agents for the cloud-particle nucleation, affects stability, dynamics and microphysics in a multiple-cloud system using simulations. Simulations show that despite increases in stability due to increasing concentrations of black carbon aerosols, there are increases in the averaged updraft mass fluxes (over the whole simulation domain and period). This is because aerosol-enhanced evaporative cooling intensifies convergence near the surface. This increase in the intensity of convergence induces an increase in the frequency of updrafts with the low range of speeds, leading to the increase in the averaged updraft mass fluxes. The increase in the frequency of updrafts induces that in the number of condensation entities and this leads to more condensation and cloud liquid that acts to be a source of the accretion of cloud liquid by precipitation. Hence, eventually, there is more accretion that offsets suppressed autoconversion, which results in negligible changes in cumulative precipitation as aerosol concentrations increase. The increase in the frequency of updrafts with the low range of speeds alters the cloud-system organization (represented by cloud-depth spatiotemporal distributions and cloud-cell population) by supporting more low-depth clouds. The altered organization in turn alters precipitation spatiotemporal distributions by generating more weak precipitation events. Aerosol-induced reduction in solar radiation that reaches the surface induces more occurrences of small-value surface heat fluxes, which in turn supports the more low-depth clouds and weak precipitation together with the greater occurrence of low-speed updrafts. © 2017, Springer-Verlag Berlin Heidelberg.
DOI
10.1007/s00382-017-3552-x
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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