 |
| Titel |
The environmental impact of the Puyehue–Cordon Caulle 2011 volcanic eruption on Buenos Aires |
| VerfasserIn |
G. B. Raga, D. Baumgardner, A. G. Ulke, M. Torres Brizuela, B. Kucienska |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 9 ; Nr. 13, no. 9 (2013-09-23), S.2319-2330 |
| Datensatznummer |
250085517
|
| Publikation (Nr.) |
 copernicus.org/nhess-13-2319-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
On 4 June 2011, the volcanic complex Puyehue–Cordon Caulle located in the
Chilean Andes erupted, producing a plume of gases and particles that
eventually circled the Southern Hemisphere, disrupting air travel and
depositing ash in large quantities. On eight occasions, the plume passed
over the city of Buenos Aires, Argentina, leading local authorities to close
the two international airports.
The eruption occurred during an on-going field campaign when measurements of
the properties of atmospheric aerosol particles were being made in Buenos
Aires as part of a year-long study of the concentration and optical
properties of aerosol at one site in the city. The suite of instruments
deployed in Buenos Aires were not tailored to measurements of volcanic ash,
but were designed to characterize urban conditions. Nevertheless, these
measurements were analysed for periods when vertical profiles of aerosol
backscatter, made with a ceilometer, clearly showed the presence of the
volcano plume over the research site and resulted in airport closure.
Aerosol optical thickness derived from AERONET, MODIS and a ceilometer at
our research site, all show enhanced values clearly indicating that the
three platforms identified the volcanic plume simultaneously. However, a
quantitative comparison of the different estimates proves difficult,
suggesting large spatial and temporal variability of the plume.
Our results indicate that the number concentration of condensation nuclei
(CN), the mass concentration of particle-bound polycyclic aromatic
hydrocarbons (PPAH) and the light absorption coefficient exceeded the
average background values by more than one standard deviation during the
events of volcanic plume. The anomalous concentrations of CN suggest new
particle formation, presumably from the conversion of SO2, while the
anomalous concentrations of PPAH may come from the uptake of PAHs on the
plume particles or from chemical reactions on the surface of plume
particles. The anomalous absorption coefficients indicate that plume
particles may contain certain compounds that can absorb radiation at 550 nm.
Another possible explanation consistent with the observations is the
scavenging of black carbon from urban sources as the plume descends through
the boundary layer to the surface. In addition, the volcanic plume
influenced the local meteorology resulting in a decrease of the temperature
when compared to the average temperature during days with no plume present. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|