Soluble Fe in Aerosols Sustained by Gaseous HO2 Uptake

Mao, Jingqiu; Fan, Songmiao; Horowitz, Larry W.

doi:10.1021/acs.estlett.7b00017

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

i

Soluble Fe in Aerosols Sustained by Gaseous HO2 Uptake

2017
By Mao, Jingqiu ; Fan, Songmiao ; Horowitz, Larry W.
Source: Environmental Science & Technology Letters, 4(3), 98-104

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Details:

Journal Title:

Environmental Science & Technology Letters
Personal Author:

Mao, Jingqiu ; Fan, Songmiao ; Horowitz, Larry W.

Mao, Jingqiu ; Fan, Songmiao ; Horowitz, Larry W. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory)

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) Less -
Description:

The soluble fraction of aerosol Fe, mainly Fe(II), represents a large source of nutrient iron to the open ocean. Fe(II) may also play an important role in the adverse health effects of ambient aerosols. Our current understanding of the reduction of Fe(III) to Fe(II) in aerosols suggests that the major pathway is the photoreduction of Fe(III)–oxalate complexes, but this pathway cannot explain the observed nighttime Fe(II) in ambient aerosols and is also limited by the supply of oxalate. Here we propose a new pathway initiated by gaseous HO2 uptake, followed by Cu–Fe redox coupling, which can sustain nighttime Fe(II) and also dominate Fe(III) reduction in the absence of Fe(III)–oxalate complexes. Consequently, aqueous OH production is substantially enhanced via the Fenton reaction and sustained by the influx of HO2 from the gas phase. This mechanism is potentially the major mechanism for sustaining soluble Fe(II) in ambient aerosols and can be tested by a combination of modeling and aerosol Fe speciation measurements. We hypothesize that this mechanism may also be relevant to mineral Fe dissolution in dust aerosols.
Keywords:

[+]

Ecology Environmental Chemistry Health, Toxicology And Mutagenesis Pollution Waste Management And Disposal Water Science And Technology
Source:

Environmental Science & Technology Letters, 4(3), 98-104
DOI:

https://doi.org/10.1021/acs.estlett.7b00017
ISSN:

2328-8930;2328-8930;
Format:

PDF
Publisher:

American Chemical Society (ACS)
Document Type:

Journal Article
Funding:

Grant no. NA13OAR4310071
Rights Information:

Other
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Library
Main Document Checksum:

[+]

urn:sha256:0908e2e0751a78a646d9ed90284e2e00c82ec188f53de07a1b72e31efec91e40
Download URL:

https://repository.library.noaa.gov/view/noaa/60543/noaa_60543_DS1.pdf
File Type:

[PDF-877.04 KB]