Urban-to-downwind variations in aerosol composition and optical properties in the Paris urban plume from coordinated airborne and ground-based observations

Yu, Chenjie; Di Antonio, Ludovico; DeCarlo, Peter F.; Nault, Benjamin A.; Velazquez-Garcia, Alejandra; Aruffo, Eleonora; Di Carlo, Piero; Denjean, Cyrielle; Tinorua, Sarah; Bourrianne, Thierry; Pereira, Diana L.; Tu, Kevin; Pangui, Edouard; Cazaunau, Mathieu; Bauville, Astrid; Grand, Noël; Bergé, Antonin; Di Biagio, Claudia; Gratien, Aline; Beekmann, Matthias; Siour, Guillaume; Foret, Gilles; D'Anna, Barbara; Kammer, Julien; Wu, Huihui; Cantrell, Christopher; Formenti, Paola; Michoud, Vincent

doi:10.5194/acp-26-15055-2026

Articles | Volume 26, issue 20

https://doi.org/10.5194/acp-26-15055-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Atmospheric Chemistry of the Suburban Forest – multiplatform...

https://doi.org/10.5194/acp-26-15055-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 26, issue 20

Research article

|

27 Oct 2026

Research article |

| 27 Oct 2026

Urban-to-downwind variations in aerosol composition and optical properties in the Paris urban plume from coordinated airborne and ground-based observations

Chenjie Yu, Ludovico Di Antonio, Peter F. DeCarlo, Benjamin A. Nault, Alejandra Velazquez-Garcia, Eleonora Aruffo, Piero Di Carlo, Cyrielle Denjean, Sarah Tinorua, Thierry Bourrianne, Diana L. Pereira, Kevin Tu, Edouard Pangui, Mathieu Cazaunau, Astrid Bauville, Noël Grand, Antonin Bergé, Claudia Di Biagio, Aline Gratien, Matthias Beekmann, Guillaume Siour, Gilles Foret, Barbara D'Anna, Julien Kammer, Huihui Wu, Christopher Cantrell, Paola Formenti, and Vincent Michoud

Supplement

https://doi.org/10.5194/acp-26-15055-2026-supplement

Data sets

ACROSS_LISA_SAFIRE-ATR42_A2S2-Ext-Scatt-450_20220618-20220705 C. Yu and P. Formenti https://doi.org/10.25326/526

ACROSS_LISA_SAFIRE-ATR42_A2S2-Ext-Scatt-630_20220618-20220705 C. Yu and P. Formenti https://doi.org/10.25326/525

ACROSS_LISA_SAFIRE-ATR42_AMS_20220618-20220705 C. Yu et al. https://doi.org/10.25326/686

ACROSS-2022_SAFIRE-ATR42_SAFIRE_CORE_TDYN thermodynamic and dynamic data 1Hz C. Cantrell https://doi.org/10.25326/380

ACROSS_ATR42_SAFIRE_CHEMISTRY_O3TEI49I_5SEC in situ measurements C. Cantrell https://doi.org/10.25326/629

ACROSS_CNRM_SAFIRE-ATR42_rBC A. Velazquez-Garcia et al. https://doi.org/10.25326/504

ACROSS_LCE_PRG_SMPS_5 min_L2 J. Kammer et al. https://doi.org/10.25326/658

ACROSS_LISA_PRG_ACSM-nrPM1comp_6-min_v1_L2 C. Di Biagio et al. https://doi.org/10.25326/775

ACROSS_LISA_PRG_AETH-Abs_PM1_1-Min_L2 L. Di Antonio et al. https://doi.org/10.25326/574

ACROSS_LISA_PRG_NEPH_Scatt-Backscatt_PM1_1-Min_L2 L. Di Antonio et al. https://doi.org/10.25326/538

ACROSS_LISA_PRG_NOx_1-Min_L2 L. Di Antonio et al. https://doi.org/10.25326/859

ACROSS_LISA_PRG_O3_1-Min_L2 L. Di Antonio et al. https://doi.org/10.25326/860

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Short summary

Coordinated ground-based and airborne measurements in Paris revealed urban-to-downwind aerosol differences over transport times of 2–6 h. Downwind organic aerosol was more oxidized, and aerosols exhibited higher single-scattering albedo, higher real and lower imaginary refractive indices, and stronger wavelength dependence of absorption. These findings highlight the need to represent evolving aerosol properties in atmospheric models and remote-sensing retrievals.