 |
| Titel |
Parametric studies of contrail ice particle formation in jet regime using microphysical parcel modeling |
| VerfasserIn |
H.-W. Wong, R. C. Miake-Lye |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 7 ; Nr. 10, no. 7 (2010-04-06), S.3261-3272 |
| Datensatznummer |
250008328
|
| Publikation (Nr.) |
 copernicus.org/acp-10-3261-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| Condensation trails (contrails) formed from water vapor emissions behind
aircraft engines are the most uncertain components of the aviation impacts
on climate change. To gain improved knowledge of contrail and
contrail-induced cirrus cloud formation, understanding of contrail ice
particle formation immediately after aircraft engines is needed. Despite
many efforts spent in modeling the microphysics of ice crystal formation in
jet regime (with a plume age <5 s), systematic understanding of
parametric effects of variables affecting contrail ice particle formation is
still limited. In this work, we apply a microphysical parcel modeling
approach to study contrail ice particle formation in near-field aircraft
plumes up to 1000 m downstream of an aircraft engine in the soot-rich regime
(soot number emission index >1×1015 (kg-fuel)−1) at
cruise. The effects of dilution history, ion-mediated nucleation, ambient
relative humidity, fuel sulfur contents, and initial soot emissions were
investigated. Our simulation results suggest that ice particles are mainly
formed by water condensation on emitted soot particles. The growth of ice
coated soot particles is driven by water vapor emissions in the first 1000 m
and by ambient relative humidity afterwards. The presence of chemi-ions does
not significantly contribute to the formation of ice particles in the
soot-rich regime, and the effect of fuel sulfur contents is small over the
range typical of standard jet fuels. The initial properties of soot
emissions play the most critical role, and our calculations suggest that
higher number concentration and smaller size of contrail particle nuclei may
be able to effectively suppress the formation of contrail ice particles.
Further modeling and experimental studies are needed to verify if our
findings can provide a possible approach for contrail mitigation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|