 |
| Titel |
Aerosol effects on the cloud-field properties of tropical convective clouds |
| VerfasserIn |
S.-S. Lee, G. Feingold |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 14 ; Nr. 13, no. 14 (2013-07-17), S.6713-6726 |
| Datensatznummer |
250018762
|
| Publikation (Nr.) |
 copernicus.org/acp-13-6713-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Aerosol effects on condensed water and precipitation in a tropical cloud
system driven by deep convective clouds are investigated for two-dimensional
simulations of 2-day duration. Although an assumed 10-fold increase in
aerosol concentration results in a similar temporal evolution of mean
precipitation and a small (9%) difference in cumulative precipitation
between the high- and low-aerosol cases, the characteristics of the
convection are much more sensitive to aerosol. The convective mass flux, and
temporal evolution and frequency distribution of the condensed water path WP
(sum of liquid- and ice-water paths) differ significantly between unperturbed
and aerosol-perturbed simulations. There are concomitant differences in the
relative importance of individual microphysical processes and the frequency
distribution of the precipitation rate (P). With increasing aerosol (i) the
convective mass flux increases, leading to increases in condensation, cloud
liquid, and accretion of cloud liquid by precipitation; (ii) autoconversion
of cloud water to rain water decreases; (iii) the WP spatial distribution
becomes more homogeneous; and (iv) there is an increase in the frequencies of
high and low WP and P, and a decrease in these frequencies at the mid-range
of WP and P. Thus, while aerosol perturbations have a small influence on total
precipitation amount, for the case considered, they do have substantial
influence on the spatiotemporal distribution of convection and
precipitation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|