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| Titel |
Size-resolved aerosol water uptake and cloud condensation nuclei measurements as measured above a Southeast Asian rainforest during OP3 |
| VerfasserIn |
M. Irwin, N. Robinson, J. D. Allan, H. Coe, G. McFiggans |
| 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 ; 11, no. 21 ; Nr. 11, no. 21 (2011-11-10), S.11157-11174 |
| Datensatznummer |
250010180
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| Publikation (Nr.) |
 copernicus.org/acp-11-11157-2011.pdf |
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| Zusammenfassung |
The influence of the properties of fine particles on the formation of clouds
and precipitation in the tropical atmosphere is of primary importance to
their impacts on radiative forcing and the hydrological cycle. Measurements
of aerosol number size distribution, hygroscopicity in both sub- and
supersaturated regimes and composition were taken between March and July 2008
in the tropical rainforest in Borneo, Malaysia, marking the first study of
this type in an Asian tropical rainforest. Hygroscopic growth factors (GF) at
90 % relative humidity (RH) for the dry diameter range D0 = 32–258 nm,
supersaturated water uptake behaviour for the dry diameter range
D0 = 45–300 nm and aerosol chemical composition were simultaneously
measured using a Hygroscopicity Tandem Differential Mobility Analyser
(HTDMA), a Droplet Measurement Technologies Cloud Condensation Nuclei counter
(CCNc) and an Aerodyne Aerosol Mass Spectrometer (AMS) respectively.
The hygroscopicity parameter κ was derived from both CCNc and HTDMA
measurements, with the resulting values of κ ranging from 0.05–0.37,
and 0.17–0.37, respectively. Although the total range of κ
values is in good agreement, there are inconsistencies between CCNc and HTDMA
derived κ values at different dry diameters. Results from a study with
similar methodology performed in the Amazon rainforest report values for
κ within a similar range to those reported in this work, indicating
that the aerosol as measured from both sites shows similar hygroscopic
properties. However, the derived number of cloud condensation nuclei
(NCCN) were much higher in the present experiment than the Amazon,
resulting in part from the increased total particle number concentrations
observed in the Bornean rainforest. This contrast between the two
environments may be of substantial importance in describing the impacts of
particles in the tropical atmosphere. |
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