Aerosol-cloud interactions in mixed-phase convective clouds - Part 1: Aerosol perturbations

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • Annette K Miltenberger
  • Paul R Field
  • Adrian A Hill
  • Phil Rosenberg
  • Ben J Shipway
  • Jonathan M Wilkinson
  • Robert Scovell
  • Alan M Blyth
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000426721500002&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/acp-18-3119-2018
eISSN
1680-7324
Externe Identifier
  • Clarivate Analytics Document Solution ID: FY3LN
ISSN
1680-7316
Ausgabe der Veröffentlichung
5
Zeitschrift
ATMOSPHERIC CHEMISTRY AND PHYSICS
Paginierung
3119 - 3145
Datum der Veröffentlichung
2018
Status
Published
Titel
Aerosol-cloud interactions in mixed-phase convective clouds - Part 1: Aerosol perturbations
Sub types
  • Article
Ausgabe der Zeitschrift
18

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:p>Abstract. Changes induced by perturbed aerosol conditions in moderately deep mixed-phase convective clouds (cloud top height ∼ 5 km) developing along sea-breeze convergence lines are investigated with high-resolution numerical model simulations. The simulations utilise the newly developed Cloud–AeroSol Interacting Microphysics (CASIM) module for the Unified Model (UM), which allows for the representation of the two-way interaction between cloud and aerosol fields. Simulations are evaluated against observations collected during the COnvective Precipitation Experiment (COPE) field campaign over the southwestern peninsula of the UK in 2013. The simulations compare favourably with observed thermodynamic profiles, cloud base cloud droplet number concentrations (CDNC), cloud depth, and radar reflectivity statistics. Including the modification of aerosol fields by cloud microphysical processes improves the correspondence with observed CDNC values and spatial variability, but reduces the agreement with observations for average cloud size and cloud top height. Accumulated precipitation is suppressed for higher-aerosol conditions before clouds become organised along the sea-breeze convergence lines. Changes in precipitation are smaller in simulations with aerosol processing. The precipitation suppression is due to less efficient precipitation production by warm-phase microphysics, consistent with parcel model predictions. In contrast, after convective cells organise along the sea-breeze convergence zone, accumulated precipitation increases with aerosol concentrations. Condensate production increases with the aerosol concentrations due to higher vertical velocities in the convective cores and higher cloud top heights. However, for the highest-aerosol scenarios, no further increase in the condensate production occurs, as clouds grow into an upper-level stable layer. In these cases, the reduced precipitation efficiency (PE) dominates the precipitation response and no further precipitation enhancement occurs. Previous studies of deep convective clouds have related larger vertical velocities under high-aerosol conditions to enhanced latent heating from freezing. In the presented simulations changes in latent heating above the 0∘C are negligible, but latent heating from condensation increases with aerosol concentrations. It is hypothesised that this increase is related to changes in the cloud field structure reducing the mixing of environmental air into the convective core. The precipitation response of the deeper mixed-phase clouds along well-established convergence lines can be the opposite of predictions from parcel models. This occurs when clouds interact with a pre-existing thermodynamic environment and cloud field structural changes occur that are not captured by simple parcel model approaches. </jats:p>
Autoren
  • Annette K Miltenberger
  • Paul R Field
  • Adrian A Hill
  • Phil Rosenberg
  • Ben J Shipway
  • Jonathan M Wilkinson
  • Robert Scovell
  • Alan M Blyth
DOI
10.5194/acp-18-3119-2018
eISSN
1680-7324
Ausgabe der Veröffentlichung
5
Zeitschrift
Atmospheric Chemistry and Physics
Sprache
en
Online publication date
2018
Paginierung
3119 - 3145
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/acp-18-3119-2018
Datum der Datenerfassung
2020
Titel
Aerosol–cloud interactions in mixed-phase convective clouds – Part 1: Aerosol perturbations
Ausgabe der Zeitschrift
18

Datenquelle: Crossref

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