Evidence map›Paper›PMID 40612495›Full record

ArticleNPJ climate and atmospheric science2025

Photochemistry of iron-containing secondary organic aerosol is impacted by relative humidity during formation.

Natasha M Garner, Fabian Mahrt, Jens Top, Virginia Tadei, Kevin Kilchhofer, Satoshi Takahama, Imad El Haddad, David M Bell, Markus Ammann, Peter A Alpert

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in NPJ climate and atmospheric science, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors.

Natasha M GarnerPSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland.
Fabian MahrtPSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland.
Jens TopPSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland.
Virginia TadeiLaboratory of Atmospheric Processes and their Impacts, School of Architecture, Civil & Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Kevin KilchhoferPSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland.
Satoshi TakahamaLaboratory of Atmospheric Processes and their Impacts, School of Architecture, Civil & Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Imad El HaddadPSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland.
David M BellPSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland.
Markus AmmannPSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland.
Peter A AlpertPSI Center for Energy and Environmental Sciences, Paul Scherrer Institute, Villigen, Switzerland.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Secondary organic aerosol (SOA) comprises most of the submicron atmospheric particle mass, and often becomes internally mixed with other particles. When SOA mixes with transition metal (e.g., iron) containing particles, metal-organic complexes can form, enabling photochemical reactions that change aerosol physicochemical properties. We studied the photochemistry of α-pinene SOA formed on iron-containing ammonium sulfate seed particles at varying relative humidities (RH). Chemical composition and photochemical reduction of particles were analyzed by X-ray spectromicroscopy and infrared spectroscopy. SOA formed at low vs. high RH had different chemical functionality, including abundant carboxylic acids and alcohols. Following photolysis, carboxylic acids and unsubstituted alkanes decreased, and alcohols increased, consistent with decarboxylation reactions. Iron in SOA formed at high RH was readily photochemically reduced, but iron in SOA formed at low RH was not. Overall, RH conditions at SOA formation affect not only chemical composition but also iron-complex formation and hence photochemical processing of aerosols.

Indexed as

Atmospheric chemistryAtmospheric science

Identifiers

PMID40612495
PMCPMC12213612

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.