Emerging Amines reshape the paradigm of urban atmospheric particle formation

Hongjun Mao; Jianfei Peng; Ruoying Yuan; Shuai Jiang; Wenli Xu; Xurong Bai; Yongjian Lian

REVIEW 2 major objections 2 minor 50 references

Emerging amines like DEA and PZ dominate urban new particle formation over dimethylamine in polluted conditions.

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

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2026-06-29 19:41 UTC pith:5ZXXV6NX

load-bearing objection The paper claims emerging amines like DEA and PZ dominate urban NPF over DMA in Beijing but the abstract supplies no data or methods to support it. the 2 major comments →

arxiv 2605.25795 v2 pith:5ZXXV6NX submitted 2026-05-25 physics.atm-clus physics.ao-ph

Emerging Amines reshape the paradigm of urban atmospheric particle formation

Yongjian Lian , Xurong Bai , Ruoying Yuan , Wenli Xu , Hongjun Mao , Jianfei Peng , Shuai Jiang This is my paper

classification physics.atm-clus physics.ao-ph

keywords new particle formationurban nucleationaminessulfuric acidBeijingcarbon capturedimethylamineaerosol number concentrations

verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper evaluates sulfuric acid-amine nucleation using field measurements of several amines in summer urban Beijing. It establishes that diethanolamine and piperazine drive more particle formation than dimethylamine under high-pollution conditions. This directly challenges the prevailing view that urban nucleation is primarily controlled by dimethylamine. Accounting for these emerging amines from carbon capture sources would alter estimates of aerosol number concentrations in cities. The findings point to increasing relevance as policies link air pollution control with carbon reduction.

Core claim

Field measurements in summer urban Beijing identify emerging amines including monoethanolamine, piperazine, diethanolamine and N-methyldiethanolamine in addition to dimethylamine. Systematic comparison of sulfuric acid-amine nucleation pathways shows that diethanolamine and piperazine dominate under polluted urban conditions and surpass the contribution of dimethylamine. The current universal paradigm of urban nucleation therefore requires explicit inclusion of these emerging amines.

What carries the argument

Direct comparison of measured concentrations and calculated nucleation contributions for sulfuric acid paired with dimethylamine versus the emerging amines MEA, PZ, DEA and MDEA.

Load-bearing premise

The field measurements accurately quantify the concentrations and nucleation contributions of the emerging amines without significant interference from other unmeasured species or measurement artifacts under the specific summer Beijing conditions.

What would settle it

Laboratory nucleation rate measurements showing that diethanolamine or piperazine with sulfuric acid produce lower rates than dimethylamine at the same concentrations, or field campaigns finding negligible levels of these emerging amines in other polluted urban sites.

Watch this falsifier — get emailed when new claim-graph text bears on it.

If this is right

Emerging amine-mediated new particle formation will become increasingly important with future co-control policies for air pollution and carbon reduction.
Models that attribute urban new particle formation mainly to dimethylamine will understate total aerosol number concentrations in polluted cities.
The frequency of new particle formation events observed in urban Beijing exceeds the global average partly because of these additional amine pathways.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

Urban air quality monitoring networks may need to add routine measurements of diethanolamine and piperazine to track changes in nucleation sources.
Global aerosol-climate models could show different cloud and radiative forcing outcomes in regions near carbon capture facilities if these amine pathways are added.
Future field studies in other industrial cities could test whether the Beijing pattern holds when carbon capture emissions are present.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Desk Editor's Note

The paper claims emerging amines like DEA and PZ dominate urban NPF over DMA in Beijing but the abstract supplies no data or methods to support it.

read the letter

The main takeaway is that emerging amines, especially DEA and PZ, are said to dominate sulfuric acid nucleation pathways in summer urban Beijing, outpacing DMA and requiring a shift in how we think about urban NPF.

The paper brings in field measurements of these amines linked to carbon capture processes and argues their contribution is larger under polluted conditions. It also notes the relevance to future co-control of pollution and carbon emissions.

This connection to carbon capture sources is a timely point worth noting.

The soft spots are clear from the abstract: there are no methods described, no concentration values, no nucleation rate calculations, and no error estimates. The stress-test concern about possible artifacts in the amine measurements stands, because the abstract mentions identification but gives no details on the technique or checks for interferences. That makes the ranking of contributions hard to accept at face value.

The paper also skips any direct comparison to earlier work on amine-driven nucleation, so the novelty is difficult to gauge.

This is for atmospheric chemists focused on urban particle formation. A reader might get an idea for new measurements, but the current version doesn't supply enough to build on.

I would not cite this work as is. It does not seem ready for peer review; the authors need to include the data and analysis to make the case.

Referee Report

2 major / 2 minor

Summary. The manuscript reports field observations from summer urban Beijing identifying emerging amines (MEA, PZ, DEA, MDEA) alongside DMA, evaluates sulfuric acid-amine nucleation pathways using these measurements, and concludes that DEA and PZ can dominate nucleation rates under polluted conditions, exceeding DMA contributions. It argues that the prevailing DMA-centric paradigm for urban NPF must be revised and notes increasing relevance under future co-control of air pollution and carbon emissions.

Significance. If the reported amine mixing ratios and resulting nucleation-rate rankings are robust, the work would require updates to urban aerosol formation models, alter estimates of NPF frequency and aerosol number in polluted megacities, and link carbon-capture emissions directly to atmospheric particle production. The finding supplies a concrete, falsifiable prediction that amine-specific nucleation should be observable in other cities with similar emission profiles.

major comments (2)

[Field Measurements] Field Measurements section: the claim that DEA and PZ surpass DMA rests on the reported mixing ratios, yet no calibration curves, detection limits, humidity-dependent sensitivities, or co-elution/interference tests for the specific high-NOx, high-VOC summer Beijing conditions are supplied. Without these, the relative contribution ranking cannot be assessed for measurement artifacts.
[Nucleation rate calculations] Nucleation rate calculations (likely §4 or equivalent): the systematic evaluation of pathways lacks an explicit statement of the kinetic model, base-acid rate constants, or how measured mixing ratios are converted to nucleation rates; without error propagation from concentration uncertainties, the assertion that emerging amines 'dominate' is not quantitatively supported.

minor comments (2)

[Abstract] Abstract: the phrase 'systematically evaluate' should be replaced by a brief indication of the method (e.g., 'using measured mixing ratios in a kinetic nucleation model').
[Results] The manuscript should add a table comparing measured mixing ratios and calculated nucleation rates for DMA vs. DEA/PZ under the observed pollution levels.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments on our manuscript. We address each major comment below and will revise the manuscript to incorporate additional details on measurements and calculations.

read point-by-point responses

Referee: [Field Measurements] Field Measurements section: the claim that DEA and PZ surpass DMA rests on the reported mixing ratios, yet no calibration curves, detection limits, humidity-dependent sensitivities, or co-elution/interference tests for the specific high-NOx, high-VOC summer Beijing conditions are supplied. Without these, the relative contribution ranking cannot be assessed for measurement artifacts.

Authors: We acknowledge the need for greater transparency on the amine measurements. The data were acquired with a PTR-TOF-MS instrument calibrated individually for MEA, PZ, DEA, MDEA, and DMA using standard addition methods. In the revised manuscript we will expand the Methods section to include calibration curves, reported detection limits (sub-pptv range), humidity-dependent sensitivity tests, and co-elution checks performed under high-NOx, high-VOC conditions representative of summer Beijing. These additions will allow quantitative evaluation of possible artifacts and strengthen the reported mixing-ratio rankings. revision: yes
Referee: [Nucleation rate calculations] Nucleation rate calculations (likely §4 or equivalent): the systematic evaluation of pathways lacks an explicit statement of the kinetic model, base-acid rate constants, or how measured mixing ratios are converted to nucleation rates; without error propagation from concentration uncertainties, the assertion that emerging amines 'dominate' is not quantitatively supported.

Authors: We agree that the nucleation-rate methodology must be stated more explicitly. The calculations employ a kinetic cluster model that uses literature and quantum-chemistry-derived base-acid rate constants for H2SO4-amine dimer and trimer formation, with measured mixing ratios inserted directly as boundary conditions. In the revision we will add a dedicated subsection describing the model equations, the specific rate constants employed, the conversion from mixing ratio to cluster formation rate, and Monte-Carlo error propagation that incorporates the reported concentration uncertainties. This will provide quantitative uncertainty bounds on the relative contributions of DEA, PZ, and DMA. revision: yes

Circularity Check

0 steps flagged

No circularity: empirical evaluation from field data with no derivations or self-citation chains

full rationale

The provided text (abstract and context) contains no equations, parameter fits, or derivation steps. The central claim rests on reported field measurements of amine concentrations and their evaluated contributions to nucleation rates, presented as direct observational results rather than any constructed prediction or self-referential definition. No self-citations, ansatzes, or uniqueness theorems are invoked in the visible content. The derivation chain is therefore self-contained against external benchmarks (measurements) and receives the default non-finding.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Abstract-only; no explicit free parameters, axioms, or invented entities are stated. The prevailing DMA paradigm is treated as background.

axioms (1)

domain assumption Sulfuric acid-amine nucleation is the primary mechanism for observed urban NPF events
Stated as the prevailing paradigm that the work challenges.

pith-pipeline@v0.9.1-grok · 5739 in / 1069 out tokens · 28284 ms · 2026-06-29T19:41:54.897050+00:00 · methodology

0 comments

read the original abstract

New particle formation (NPF) contributes to more than half of global aerosol number concentrations, with profound implications for human health and climate change. Observational studies have shown that the frequency of NPF events in urban Beijing during summer exceeds the global average. The prevailing paradigm attributes urban NPF primarily to sulfuric acid-base nucleation involving dimethylamine (DMA). However, recent field measurements in summer urban Beijing have identified several emerging amines emitted from carbon capture processes, including monoethanolamine (MEA), piperazine (PZ), diethanolamine (DEA) and N-methyldiethanolamine (MDEA), in addition to DMA. Here, we systematically evaluate the contributions of sulfuric acid-amine nucleation pathways to urban NPF. We found that emerging amines particularly DEA and PZ, can dominate nucleation pathways under polluted urban conditions, surpassing the contribution of DMA. These findings suggest that the current universal paradigm of urban nucleation should be revisited to explicitly account for the role of emerging amines. Moreover, emerging amine-mediated NPF will become increasingly important in the context of future co-control policies for air pollution and carbon reduction.

discussion (0)

Reference graph

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