@Article{YeeIWMRKHBGUBTGOLKKSMAPHCDJLMAVMOSMLG:2018:ObSeOx,
author = "Yee, Lindsay D. and Isaacman-VanWertz, Gabriel and Wernis, Rebecca
A. and Meng, Meng and Rivera, Ventura and Kreisberg, Nathan M. and
Hering, Susanne V. and Bering, Mads S. and Glasius, Marianne and
Upshur, Mary Alice and B{\'e}, Ariana Gray and Thomson, Regan J.
and Geiger, Franz M. and Offenberg, John H. and Lewandowski,
Michael and Kourtchev, Ivan and Kalberer, Markus and S{\'a},
Suzane de and Martin, Scot T. and Alexander, M. Lizabeth and Palm,
Brett B. and Hu, Weiwei and Campuzano-Jost, Pedro and Day, Douglas
A. and Jimenez, Jose L. and Liu, Yingjun and McKinney, Karena A.
and Artaxo, Paulo and Viegas, Juarez and Manzi, Antonio and
Oliveira, Maria B. and Souza, Rodrigo de and Machado, Luiz Augusto
Toledo and Longo, Karla Maria and Goldstein, Allen H.",
affiliation = "{University of California} and {University of California} and
{University of California} and {University of California} and
{University of California} and {Aerosol Dynamics Inc} and {Aerosol
Dynamics Inc} and {Aarhus University} and {Aarhus University} and
{Northwestern University} and {Northwestern University} and
{Northwestern University} and {Northwestern University} and
{United States Environmental Protection Agency} and {United States
Environmental Protection Agency} and {University of Cambridge} and
{University of Cambridge} and {Harvard University} and {Harvard
University} and {Pacific Northwest National Laboratory} and
{Cooperative Institute for Research in Environmental Sciences
(CIRES)} and {Cooperative Institute for Research in Environmental
Sciences (CIRES)} and {Cooperative Institute for Research in
Environmental Sciences (CIRES)} and {Cooperative Institute for
Research in Environmental Sciences (CIRES)} and {Cooperative
Institute for Research in Environmental Sciences (CIRES)} and
{Harvard University} and {Harvard University} and {Universidade de
S{\~a}o Paulo (USP)} and {Instituto Nacional de Pesquisas da
Amazonia (INPA)} and {Instituto Nacional de Pesquisas da Amazonia
(INPA)} and {Universidade do Estado do Amazonas (UEAM)} and
{Universidade do Estado do Amazonas (UEAM)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {University of California}",
title = "Observations of sesquiterpenes and their oxidation products in
central Amazonia during the wet and dry seasons",
journal = "Atmospheric Chemistry and Physics Discussion",
year = "2018",
volume = "2018",
month = "Feb.",
abstract = "Biogenic volatile organic compounds (BVOCs) from the Amazon forest
region represent the largest source of organic carbon emissions to
the atmosphere globally. These BVOC emissions dominantly consist
of volatile and intermediate volatility terpenoid compounds that
undergo chemical transformations in the atmosphere to form
oxygenated condensable gases and secondary organic aerosol (SOA).
We collected quartz filter samples with 12-hour time resolution
and performed hourly in-situ measurements with the Semi-Volatile
Thermal desorption Aerosol Gas chromatograph (SV-TAG) at a rural
site (T3) located to the west of the urban center of Manaus,
Brazil as part of the Green Ocean Amazon (GoAmazon2014/5) field
campaign to measure intermediate volatility and semi-volatile
BVOCs and their oxidation products during the wet and dry seasons.
We speciated and quantified 30 sesquiterpenes and four diterpenes
with concentrations in the range
0.016.04\ ng\ m\−3 (1670\ ppqv). We
estimate that sesquiterpenes contribute approximately 14\ %
and 12\ % to the total reactive loss of O3 via reaction
with isoprene or terpenes during the wet and dry seasons,
respectively. This is reduced from ~\ 5070\ % for
within-canopy reactive O3 loss, attributed to ozonolysis of highly
reactive sesquiterpenes (e.g. \β-caryophyllene) that are
reacted away before reaching our measurement site. We further
identify a suite of their oxidation products in the gas and
particle phases and explore their role in biogenic SOA formation
in the Central Amazon region. Synthesized authentic standards were
also used to quantify gas- and particle-phase oxidation products
derived from \β-caryophyllene. Using tracer-based scaling
methods for these products, we roughly estimate that sesquiterpene
oxidation contributes at least 118\ % (median 5\ %)
of total submicron OA mass. However, this is likely a low-end
estimate, as evidence for additional unaccounted sesquiterpenes
and their oxidation products clearly exists. By comparing our
field data to laboratory-based sesquiterpene oxidation experiments
we confirm more than 40 additional observed compounds produced
through sesquiterpene oxidation are present in Amazonian SOA,
warranting further efforts towards more complete quantification.",
doi = "10.5194/acp-2018-191",
url = "http://dx.doi.org/10.5194/acp-2018-191",
issn = "1680-7367",
language = "en",
targetfile = "yee_observations.pdf",
urlaccessdate = "28 mar. 2024"
}