 |
| Titel |
Links between satellite-retrieved aerosol and precipitation |
| VerfasserIn |
E. Gryspeerdt, P. Stier, D. G. Partridge |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 18 ; Nr. 14, no. 18 (2014-09-16), S.9677-9694 |
| Datensatznummer |
250119035
|
| Publikation (Nr.) |
 copernicus.org/acp-14-9677-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
Many theories have been proposed detailing how aerosols might impact
precipitation, predicting both increases and decreases depending on the
prevailing meteorological conditions and aerosol type. In convective clouds,
increased aerosol concentrations have been speculated to invigorate convective
activity. Previous studies have shown large increases in precipitation with
increasing aerosol optical depth, concluding an aerosol effect on
precipitation. Our analysis reveals that these studies may have been
influenced by cloud effects on the retrieved aerosol, as well as by
meteorological covariations.
We use a regime-based approach to separate out different cloud regimes,
allowing for the study of aerosol–cloud interactions in individual cloud regimes.
We account for the influence of cloud properties on the aerosol retrieval and
make use of the diurnal sampling of the TRMM satellite and the TRMM merged
precipitation product to investigate the precipitation development.
We find that whilst there is little effect on precipitation at the time of the
aerosol retrieval, in the 6 h after the aerosol retrieval, there is an
increase in precipitation from cloud in high-aerosol environments, consistent
with the invigoration hypothesis. Increases in lightning flash count with
increased aerosol are also observed in this period. The invigoration effect
appears to be dependent on the cloud-top temperature, with clouds with tops
colder than 0 °C showing increases in precipitation at times after
the retrieval, as well as increases in wet scavenging. Warm clouds show little
change in precipitation development with increasing aerosol, suggesting ice
processes are important for the invigoration of precipitation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|