 |
| Titel |
Calibration of LACIS as a CCN detector and its use in measuring activation and hygroscopic growth of atmospheric aerosol particles |
| VerfasserIn |
H. Wex, A. Kiselev, M. Ziese, F. Stratmann |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 12 ; Nr. 6, no. 12 (2006-10-06), S.4519-4527 |
| Datensatznummer |
250004133
|
| Publikation (Nr.) |
 copernicus.org/acp-6-4519-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| A calibration for LACIS (Leipzig Aerosol Cloud Interaction
Simulator) for its use as a CCN (cloud condensation nuclei)
detector has been developed. For this purpose, sodium chloride and
ammonium sulfate particles of known sizes were generated and their
grown sizes were detected at the LACIS outlet. From these signals,
the effective critical super-saturation was derived as a function
of the LACIS wall temperature. With this, LACIS is calibrated for
its use as a CCN detector. The applicability of LACIS for
measurements of the droplet activation, and also of the
hygroscopic growth of atmospheric aerosol particles was tested.
The activation of the urban aerosol particles used in the
measurements was found to occur at a critical super-saturation of
0.46% for particles with a dry diameter of 75 nm, and at 0.42%
for 85 nm, respectively. Hygroscopic growth was measured for
atmospheric aerosol particles with dry diameters of 150, 300 and
350 nm at relative humidities of 98 and 99%, and it was found
that the larger dry particles contained a larger soluble volume
fraction of about 0.85, compared to about 0.6 for the 150 nm
particles. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|