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| Titel |
Mineral dust indirect effects and cloud radiative feedbacks of a simulated idealized nocturnal squall line |
| VerfasserIn |
R. B. Seigel, S. C. Heever, S. M. Saleeby |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 8 ; Nr. 13, no. 8 (2013-04-30), S.4467-4485 |
| Datensatznummer |
250018620
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| Publikation (Nr.) |
 copernicus.org/acp-13-4467-2013.pdf |
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| Zusammenfassung |
Mineral dust is arguably the most abundant aerosol species in the world and
as such potentially plays a large role in aerosol indirect effects (AIEs).
This study assesses and isolates the individual responses in a squall line
that arise (1) from radiation, (2) from dust altering the microphysics, as
well as (3) from the synergistic effects between (1) and (2). To accomplish
these tasks, we use the Regional Atmospheric Modeling System (RAMS) set up
as a cloud-resolving model (CRM). The CRM contains aerosol and microphysical
schemes that allow mineral dust particles to nucleate as cloud drops and ice
crystals, replenish upon evaporation and sublimation, be tracked throughout
hydrometeor transition, and be scavenged by precipitation and dry
sedimentation.
Factor separation is used on four simulations of the squall line in order to
isolate the individual roles of radiation (RADIATION), microphysically
active dust (DUST MICRO), and the nonlinear interactions of those factors
(SYNERGY). Results indicate that RADIATION acts to increase precipitation,
intensify the cold pool, and enhance the mesoscale organization of the
squall line due to changes in microphysics originating from cloud top
cooling. Conversely, DUST MICRO decreases precipitation, weakens the cold
pool, and weakens the mesoscale organization of the squall line due to an
enhancement of the warm rain process. SYNERGY shows little impact on the
squall line, except near the freezing level, where an increase in mesoscale
organization takes place. The combined effect of the mineral dust AIE due to
both DUST MICRO and SYNERGY is to weaken the squall line. |
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