@Article{AndreaeABBFGLMWW:2012:CaMoRe,
author = "Andreae, MO and Artaxo, P and Beck, V and Bela, M and Freitas, S
and Gerbig, C and Longo, K and Munger, J. and Wiedemann, K. T. and
Wofsy, S. C",
affiliation = "Max Planck Inst Chem, Biogeochem Dept, Mainz, Germany and Univ Sao
Paulo, Inst Phys, Sao Paulo, Brazil and Max Planck Inst
Biogeochem, Jena, Germany and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and Max Planck Inst Biogeochem, Jena, Germany and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and Harvard
Univ, Dept Earth \& Planetary Sci, Div Engn \& Appl Sci,
Cambridge, MA 02138 USA and Harvard Univ, Dept Earth \& Planetary
Sci, Div Engn \& Appl Sci, Cambridge, MA 02138 USA and Harvard
Univ, Dept Earth \& Planetary Sci, Div Engn \& Appl Sci,
Cambridge, MA 02138 USA",
title = "Carbon monoxide and related trace gases and aerosols over the
Amazon Basin during the wet and dry seasons",
journal = "Atmospheric Chemistry and Physics",
year = "2012",
volume = "12",
number = "13",
pages = "6041--6065",
keywords = "BIOMASS-BURNING EMISSIONS, BOUNDARY-LAYER EXPERIMENT, TROPICAL
SOUTH-ATLANTIC, LONG-RANGE TRANSPORT, NORTH-AFRICAN DUST, SYSTEM
CATT-BRAMS, ATMOSPHERIC CHEMISTRY, PLANT MATTER, RAIN-FOREST,
BRAZILIAN DEVELOPMENTS.",
abstract = "We present the results of airborne measurements of carbon monoxide
(CO) and aerosol particle number concentration (CN) made during
the Balan double dagger o Atmosf,rico Regional de Carbono na
Amazonia (BARCA) program. The primary goal of BARCA is to address
the question of basin-scale sources and sinks of CO2 and other
atmospheric carbon species, a central issue of the Large-scale
Biosphere-Atmosphere (LBA) program. The experiment consisted of
two aircraft campaigns during November-December 2008 (BARCA-A) and
May-June 2009 (BARCA-B), which covered the altitude range from the
surface up to about 4500 m, and spanned most of the Amazon Basin.
Based on meteorological analysis and measurements of the tracer,
SF6, we found that airmasses over the Amazon Basin during the late
dry season (BARCA-A, November 2008) originated predominantly from
the Southern Hemisphere, while during the late wet season
(BARCA-B, May 2009) low-level airmasses were dominated by
northern-hemispheric inflow and mid-tropospheric airmasses were of
mixed origin. In BARCA-A we found strong influence of biomass
burning emissions on the composition of the atmosphere over much
of the Amazon Basin, with CO enhancements up to 300 ppb and CN
concentrations approaching 10 000 cm(-3); the highest values were
in the southern part of the Basin at altitudes of 1-3 km. The
Delta CN/Delta CO ratios were diagnostic for biomass burning
emissions, and were lower in aged than in fresh smoke. Fresh
emissions indicated CO/CO2 and CN/CO emission ratios in good
agreement with previous work, but our results also highlight the
need to consider the residual smoldering combustion that takes
place after the active flaming phase of deforestation fires.
During the late wet season, in contrast, there was little evidence
for a significant presence of biomass smoke. Low CN concentrations
(300-500 cm(-3)) prevailed basinwide, and CO mixing ratios were
enhanced by only similar to 10 ppb above the mixing line between
Northern and Southern Hemisphere air. There was no detectable
trend in CO with distance from the coast, but there was a small
enhancement of CO in the boundary layer suggesting diffuse
biogenic sources from photochemical degradation of biogenic
volatile organic compounds or direct biological emission.
Simulations of CO distributions during BARCA-A using a range of
models yielded general agreement in spatial distribution and
confirm the important contribution from biomass burning emissions,
but the models evidence some systematic quantitative differences
compared to observed CO concentrations. These mismatches appear to
be related to problems with the accuracy of the global background
fields, the role of vertical transport and biomass smoke injection
height, the choice of model resolution, and reliability and
temporal resolution of the emissions data base.",
doi = "10.5194/acp-12-6041-2012",
url = "http://dx.doi.org/10.5194/acp-12-6041-2012",
issn = "1680-7316",
language = "en",
targetfile = "acp-12-6041-2012.pdf",
url = "www.atmos-chem-phys.net/12/6041/2012/",
urlaccessdate = "19 abr. 2024"
}