 |
| Titel |
Assessment of cloud supersaturation by size-resolved aerosol particle and cloud condensation nuclei (CCN) measurements |
| VerfasserIn |
M. L. Krüger, S. Mertes, T. Klimach, Y. F. Cheng, H. Su, J. Schneider, M. O. Andreae, U. Pöschl, D. Rose |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 8 ; Nr. 7, no. 8 (2014-08-19), S.2615-2629 |
| Datensatznummer |
250115877
|
| Publikation (Nr.) |
 copernicus.org/amt-7-2615-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
In this study we show how size-resolved measurements of aerosol particles
and cloud condensation nuclei (CCN) can be used to characterize the
supersaturation of water vapor in a cloud. The method was developed and
applied during the ACRIDICON-Zugspitze campaign (17 September to 4 October 2012) at
the high-Alpine research station Schneefernerhaus (German Alps, 2650 m a.s.l.).
Number size distributions of total and interstitial aerosol particles were
measured with a scanning mobility particle sizer (SMPS), and size-resolved
CCN efficiency spectra were recorded with a CCN counter system operated at
different supersaturation levels.
During the evolution of a cloud, aerosol particles are exposed to different
supersaturation levels. We outline and compare different estimates for the
lower and upper bounds (Slow, Shigh) and the average value
(Savg) of peak supersaturation encountered by the particles in the
cloud. A major advantage of the derivation of Slow and Savg from
size-resolved CCN efficiency spectra is that it does not require the
specific knowledge or assumptions about aerosol hygroscopicity that are
needed to derive estimates of Slow, Shigh, and Savg from aerosol
size distribution data. For the investigated cloud event, we derived
Slow ≈ 0.07–0.25%, Shigh ≈ 0.86–1.31% and Savg ≈ 0.42–0.68%. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|