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| Titel |
Mass spectrometric airborne measurements of submicron aerosol and cloud residual composition in tropic deep convection during ACRIDICON-CHUVA |
| VerfasserIn |
Christiane Schulz, Johannes Schneider, Stephan Mertes, Udo Kästner, Bernadett Weinzierl, Daniel Sauer, Daniel Fütterer, Adrian Walser, Stephan Borrmann |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250108959
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| Publikation (Nr.) |
 EGU/EGU2015-8803.pdf |
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| Zusammenfassung |
| Airborne measurements of submicron aerosol and cloud particles were conducted in the
region of Manaus (Amazonas, Brazil) during the ACRIDICON-CHUVA campaign in
September 2014. ACRIDICON-CHUVA aimed at the investigation of convective cloud
systems in order to get a better understanding and quantification of aerosol-cloud-interactions
and radiative effects of convective clouds. For that, data from airborne measurements
within convective cloud systems are combined with satellite and ground-based
data.
We used a C-ToF-AMS (Compact-Time-of-Flight-Aerosol-Mass-Spectrometer) to obtain
information on aerosol composition and vertical profiles of different aerosol species, like
organics, sulphate, nitrate, ammonium and chloride. The instrument was operated behind
two different inlets: The HASI (HALO Aerosol Submicrometer Inlet) samples
aerosol particles, whereas the CVI (Counterflow Virtual Impactor) samples cloud
droplets and ice particles during in-cloud measurements, such that cloud residual
particles can be analyzed. Differences in aerosol composition inside and outside of
clouds and cloud properties over forested or deforested region were investigated.
Additionally, the in- and outflow of convective clouds was sampled on dedicated cloud
missions in order to study the evolution of the clouds and the processing of aerosol
particles.
First results show high organic aerosol mass concentrations (typically 15 μg/m3 and during
one flight up to 25 μg/m3). Although high amounts of organic aerosol in tropic air over
rainforest regions were expected, such high mass concentrations were not anticipated. Next to
that, high sulphate aerosol mass concentrations (about 4 μg/m3) were measured at low
altitudes (up to 5 km). During some flights organic and nitrate aerosol was observed with
higher mass concentrations at high altitudes (10-12 km) than at lower altitudes, indicating
redistribution of boundary layer particles by convection. The cloud residuals measured during
in-cloud sampling through the CVI contained mainly organic material and, to a lesser extent,
nitrate. |
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