 |
| Titel |
Ground based chemical characterization of submicron aerosol during the South American Biomass Burning Analysis (SAMBBA) field experiment |
| VerfasserIn |
Joel Brito, Paulo Artaxo, Luciana Varanda Rizzo, Ben Johnson, Jim Haywood, Karla Longo, Saulo Freitas, Hugh Coe |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250082013
|
|
|
|
|
|
| Zusammenfassung |
| This work presents the results of an Aerosol Chemical Speciation Monitor (ACSM) which
was successfully operated at a ground station in Porto Velho, Brazil, during the South
American Biomass Burning Analysis (SAMBBA). SAMBBA is an international research
project based on experimental and modeling activities designed to investigate the impacts of
biomass burning emissions on climate, air quality and numerical weather prediction over
South America. The measurement program was headed by the deployment of UK’s Facility
for Airborne Atmospheric Measurements (FAAM) BAe-146 research aircraft over Brazil
during the dry season of 2012. The aircraft operation was coordinated with ground-based
measurements at Porto Velho, operated by the University of Sao Paulo. Besides the aerosol
chemical speciation, continuous measurements of aerosol size distribution and
optical properties were carried out at the ground station, together with CO, CO2
and O3. Filters for trace elements measured by XRF and for OC/EC determined
using a Sunset instrument were also collected at the ground based component of
SAMBBA.
The ACSM collected data for three weeks during September 2012. This period included a
strong biomass burning event which showed a marked peak in f60, linked with
Levoglucosan, a well-known biomass burning marker. During the biomass burning event,
organics concentrations rose up to 80 μg/m3, black carbon close to 6 μg/m3 and
CO mixing ratio above 2 ppmv. Fast biomass burning aerosol processing in the
atmosphere could be observed through the relative contributions of C2H3O+ vs. CO2+
relative to total organic mass (f44 vs. f43). A clear diurnal variation throughout the
sampling period has been observed for organic aerosols with a median peak of
9 μg/m3 at 04:00 LT and a minima of 5 μg/m3 at 18:00 LT. Preliminary results
indicate that organics are responsible for 85% of PM1 non-refractory aerosols. The
data set will allow the study of interactions between biomass burning and biogenic
emissions, focusing on changes in the radiation balance, atmospheric chemistry and
effects on the terrestrial biosphere including carbon uptake by the Amazonian forest. |
|
|
|
|
|
|