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Implications of new anthropogenic-biogenic interaction pathways on SOA formation during the GoAmazon 2014/5 field campaign

 

Authors

Manishkumar Shrivastava — Pacific Northwest National Laboratory
Jerome D Fast — Pacific Northwest National Laboratory
John E Shilling — Pacific Northwest National Laboratory
Joel Thornton — University of Washington
Rahul Zaveri — Pacific Northwest National Laboratory
Dick C Easter — Pacific Northwest National Laboratory
Alla Zelenyuk-Imre — Pacific Northwest National Laboratory
Henrique de Melo Jorge Barbosa — University of Maryland, Baltimore County
Helber Gomes — National Institute for Space Research (INPE)
Alex B Guenther — University of California - Irvine
Chun Zhao — Pacific Northwest National Laboratory
Dasa Gu — Pacific Northwest National Laboratory
Jiwen Fan — Pacific Northwest National Laboratory
Scot T. Martin — Harvard University
Allen Goldstein — University of California, Berkeley
Gabriel Isaacman-VanWertz — Massachusetts Institute of Technology
Lindsay Yee — University of California Berkeley
Lizabeth M Alexander — Pacific Northwest National Laboratory
Larry Berg — Pacific Northwest National Laboratory
Jose D Fuentes — Pennsylvania State University
Paulo Artaxo — University of Sao Paulo
Joel Brito —
Jiumeng Liu — Pacific Northwest National Laboratory
Ying Liu — Pacific Northwest National Laboratory
Suzane Simoes De Sa — Harvard University
V. Faye McNeill — Columbia University
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Category

GoAmazon – Clouds and aerosols in Amazonia

Description

Latest laboratory and field measurements have identified several pathways by which anthropogenic emissions influence the formation and evolution of secondary organic aerosols (SOA) in the atmosphere. In this study, we perform coupled chemistry-cloud-meteorology simulations using the Weather Research and Forecasting model (WRF-Chem) at a horizontal grid spacing of 2 km. We explore new chemical pathways for SOA formation that are affected by the mixing of anthropogenic emissions such as sulfate and nitrogen oxides (NOx) with the regional background dominated by biogenic volatile organic compound (VOC) emissions. These new chemistry pathways are based on some of the latest measurements of anthropogenic-biogenic interactions such as influence of a new low NOx particle-phase isoprene oxidation product on SOA formation, multiphase chemistry of isoprene epoxydiols (IEPOX) affected by sulfate and nitric oxide (NO), and the impacts of relative reaction rates of peroxy-peroxy and peroxy-NO radicals on SOA formation yields. In addition, we also investigate the implications of low SOA volatility due to particle-phase processes such as oligomerization on simulated SOA loadings. We use the extensive ground- and aircraft- based measurements of gas and particle-phase chemical composition collected during GoAmazon2014/5 to evaluate model predictions. Preliminary simulations using WRF-Chem show the Manaus plume mixing with the regional background, and the simulated SOA is dominated by biogenic VOCs during the wet season. Similar to analysis of other measurements during GoAmazon, we find that oxidants (such as hydroxyl (OH) radicals and ozone (O3)) and SOA formation are both enhanced in areas where the Manaus plume and biomass burning mix with the regional background. Sensitivity simulations that turn the Manaus emissions on/off are performed to quantify the impacts of anthropogenic-biogenic interactions on SOA formation. This study provides insights about what processes and model parameters could be most important for simulating SOA in the pristine atmosphere of the Amazon.