Abstract/Details

Aerosol, cloud, and precipitation interactions: A numerical study of the effects of regenerated aerosols on orographic clouds and precipitation


2009 2009

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Abstract (summary)

Atmospheric aerosols affect cloud and precipitation features, and further impact the climate system through the interactions between aerosols, clouds, and precipitation. On the other hand, aerosols are modulated by clouds and precipitation. The aerosol particles processed and redistributed by clouds and precipitation affect the subsequent development of clouds and precipitation. The complexities and uncertainties associated with the observational studies on aerosol-cloud-precipitation interactions (ACPI) justify the use of numerical models. However, most numerical studies investigate ACPI without considering the regeneration of aerosol particles from evaporated cloud droplets, which is a real process in clouds. Thus, their results seem to be inconclusive. This study applies a detailed bin microphysics scheme coupled with the Weather Research and Forecasting model (WRF) to investigate the regenerated aerosol effects on orographic clouds and precipitation. Both warm-phase and mixed-phase clouds have been simulated over two 2D idealized bell-shaped mountains. The results showed that (1) the exclusion of aerosol regeneration in the model results in more precipitation on the ground. (2) The cloud and precipitation properties are very sensitive to the size distributions of regenerated aerosols. (3) The riming rates of ice and snow are not sensitive to regenerated aerosols but that of graupel is very sensitive. (4) The ground precipitation of mixed-phase clouds are not as sensitive as that of the warm-phase clouds to regenerated aerosols. (5) The qualitative effects of regenerated aerosols on mixed-phase orographic clouds and precipitation properties do not change with the choices of different ice nucleation parameterizations. (6) The spatial-temporal variabilities of the background aerosol concentration are reduced when regeneration is considered.

Indexing (details)


Subject
Atmospheric Chemistry;
Meteorology;
Atmospheric sciences
Classification
0371: Atmospheric Chemistry
0557: Meteorology
0725: Atmospheric sciences
Identifier / keyword
Earth sciences; Aerosol-cloud interaction; Bin microphysics; Orographic clouds; Precipitation; Regenerated aerosols; Riming; WRF
Title
Aerosol, cloud, and precipitation interactions: A numerical study of the effects of regenerated aerosols on orographic clouds and precipitation
Author
Xue, Lulin
Number of pages
101
Publication year
2009
Degree date
2009
School code
0193
Source
DAI-B 71/04, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781109719857
Advisor
Pan, Zaitao
University/institution
Saint Louis University
University location
United States -- Missouri
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3405706
ProQuest document ID
250132960
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/250132960
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