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Modeling Volatility-Based Aerosol Phase State Predictions in the Amazon Rainforest

Rasool, Quazi Z.; Shrivastava, Manish; Octaviani, Mega ORCID iD icon; Zhao, Bin; Gaudet, Brian; Liu, Ying


Organic aerosol (OA) is a complex matrix of various constituents—fresh (primary organic aerosols—POA) and aged via oxidation (secondary organic aerosols—SOA), generated from biogenic, anthropogenic, and biomass burning sources. The viscosity of OA can be critical in influencing new particle formation, reactive uptake processes that impact evaporation-growth kinetics, and the lifetime of particles in the atmosphere. This work utilizes a well-defined relationship between volatility and viscosity for pure compounds, which we incorporated within the Weather Research and Forecasting Model coupled to chemistry (WRF-Chem) to simulate the phase state and viscosity of bulk OA during the dry-to-wet transition season (September–October) in the Amazon rainforest during 2014. Our simulations indicate spatial and temporal heterogeneity in aerosol phase state often not captured by global-scale models. We show the strong role of water associated with organic aerosol (ws) as the dominant factor that can be used to quantitatively estimate OA viscosity. Analysis of WRF-Chem simulations across the entire atmospheric column indicates a strong inverse log-linear relationship between ws and OA viscosity with a correlation coefficient approaching 1, in the background and biomass burning-influenced conditions. ... mehr

Postprint §
DOI: 10.5445/IR/1000141257
Veröffentlicht am 30.09.2022
DOI: 10.1021/acsearthspacechem.1c00255
Zitationen: 6
Web of Science
Zitationen: 6
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2021
Sprache Englisch
Identifikator ISSN: 2472-3452, 2472-3452
KITopen-ID: 1000141257
HGF-Programm 12.11.32 (POF IV, LK 01) Advancing atmospheric and Earth system models
Erschienen in ACS earth and space chemistry
Verlag American Chemical Society (ACS)
Band 5
Heft 10
Seiten 2910–2924
Vorab online veröffentlicht am 29.09.2021
Nachgewiesen in Dimensions
Web of Science
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