Artículos de revistas
Relationship between Amazon biomass burning aerosols and rainfall over the La Plata Basin
Fecha
2014Registro en:
Atmospheric Chemistry and Physics, v. 14, p. 4397-4407, 2014
1680-7367
10.5194/acp-14-4397-2014
Autor
Camponogara, Eduardo
Dias, Maria Assuncao Faus da Silva
Carrió, G. G.
Institución
Resumen
High aerosol loads are discharged into the atmosphere
by biomass burning in the Amazon and central
Brazil during the dry season. These particles can interact with
clouds as cloud condensation nuclei (CCN) changing cloud
microphysics and radiative properties and, thereby, affecting
the radiative budget of the region. Furthermore, the biomass
burning aerosols can be transported by the low-level jet (LLJ)
to the La Plata Basin, where many mesoscale convective
systems (MCS) are observed during spring and summer.
This work proposes to investigate whether the aerosols from
biomass burning may affect the MCS in terms of rainfall over
the La Plata Basin during spring. Aerosol effects are very difficult
to isolate because convective clouds are very sensitive
to small environment disturbances; for that reason, detailed
analyses using different techniques are used. The binplot,
2-D histograms and combined empirical orthogonal function
(EOF) methods are used to identify certain environmental
conditions with the possible effects of aerosol loading. Reanalysis
2, TRMM-3B42 and AERONET data are used from
1999 up to 2012 during September–December. The results
show that there are two patterns associated with rainfall–
aerosol interaction in the La Plata Basin: one in which the
dynamic conditions are more important than aerosols to generation
of rain; and a second one where the aerosol particles
have a more important role in rain formation, acting mainly
to suppress rainfall over the La Plata Basin. However, these
results need further investigation to strengthen conclusions,
especially because there are limitations and uncertainties in
the methodology and data set used