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HERO ID
3845102
Reference Type
Journal Article
Title
On the implications of aerosol liquid water and phase separation for organic aerosol mass
Author(s)
Pye, HOT; Murphy, BN; Xu, L; Ng, NL; Carlton, AG; Guo, H; Weber, R; Vasilakos, P; Appel, KW; Budisulistiorini, SH; Surratt, JD; Nenes, A; Hu, W; Jimenez, JL; Isaacman-Vanwertz, G; Misztal, PK; Goldstein, AH
Year
2017
Is Peer Reviewed?
Yes
Journal
Atmospheric Chemistry and Physics
ISSN:
1680-7316
EISSN:
1680-7324
Publisher
COPERNICUS GESELLSCHAFT MBH
Location
GOTTINGEN
Volume
17
Issue
1
Page Numbers
343-369
Language
English
PMID
30147709
DOI
10.5194/acp-17-343-2017
Web of Science Id
WOS:000393679100002
URL
https://acp.copernicus.org/articles/17/343/2017/
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Abstract
Organic compounds and liquid water are major aerosol constituents in the southeast United States (SE US). Water associated with inorganic constituents (inorganic water) can contribute to the partitioning medium for organic aerosol when relative humidities or organic matter to organic carbon (OM / OC) ratios are high such that separation relative humidities (SRH) are below the ambient relative humidity (RH). As OM / OC ratios in the SE US are often between 1.8 and 2.2, organic aerosol experiences both mixing with inorganic water and separation from it. Regional chemical transport model simulations including inorganic water (but excluding water uptake by organic compounds) in the partitioning medium for secondary organic aerosol (SOA) when RH > SRH led to increased SOA concentrations, particularly at night. Water uptake to the organic phase resulted in even greater SOA concentrations as a result of a positive feedback in which water uptake increased SOA, which further increased aerosol water and organic aerosol. Aerosol properties, such as the OM / OC and hygroscopicity parameter (kappa(org)), were captured well by the model compared with measurements during the Southern Oxidant and Aerosol Study (SOAS) 2013. Organic nitrates from monoterpene oxidation were predicted to be the least water-soluble semivolatile species in the model, but most biogenically derived semivolatile species in the Community Multiscale Air Quality (CMAQ) model were highly water soluble and expected to contribute to water-soluble organic carbon (WSOC). Organic aerosol and SOA precursors were abundant at night, but additional improvements in daytime organic aerosol are needed to close the model-measurement gap. When taking into account deviations from ideality, including both inorganic (when RH > SRH) and organic water in the organic partitioning medium reduced the mean bias in SOA for routine monitoring networks and improved model performance compared to observations from SOAS. Property updates from this work will be released in CMAQ v5.2.
Tags
IRIS
•
Nitrate/Nitrite
Broad LitSearch 2016/1/1 - 2017/12/5
Refs found by LitSearch but not ATSDR/IARC
WoS
Refs found only by 2017 LitSearch or Citation Mapping
Ref Types 12/2017
All Others
LitSearch Update 2016-2017
PubMed
WoS
•
ISA-PM (2019)
1st Draft
Chapter 2
Final ISA
Chapter 2
•
LitSearch-NOx (2024)
Keyword Search
Exposure
Confounding
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