# Ammonia in Paris derived from ground-based open-path and satellite observations

Camille Viatte, Nadir Guendouz, Clarisse Dufaux, Arjan Hensen, Daan Swart, Martin van Damme, Lieven Clarisse, Pierre-François Coheur, Cathy Clerbaux

► To cite this version:

Camille Viatte, Nadir Guendouz, Clarisse Dufaux, Arjan Hensen, Daan Swart, et al. Ammonia in Paris derived from ground-based open-path and satellite observations. EGU General Assembly 2024, Apr 2024, Vienna, Austria. pp.EGU24-8072, 2024, 10.5194/egusphere-egu24-8072 . insu-04517156

HAL Id: insu-04517156

https://insu.hal.science/insu-04517156

Submitted on 31 May 2024

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# Ammonia in Paris derived from ground-based open-path and satellite observations

Camille Viatte, Nadir Guendouz, Clarisse Dufaux, Arjan Hensen, Daan Swart, Martin van Damme, Lieven Clarisse, Pierre-François Coheur, Cathy Clerbaux

► To cite this version:

Camille Viatte, Nadir Guendouz, Clarisse Dufaux, Arjan Hensen, Daan Swart, et al. Ammonia in Paris derived from ground-based open-path and satellite observations. EGU General Assembly 2024, Apr 2024, Vienna, Austria. pp.EGU24-8072, 2024, 10.5194/egusphere-egu24-8072 . insu-04517156

HAL Id: insu-04517156

https://insu.hal.science/insu-04517156v1

Submitted on 31 May 2024

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

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<figure><img src="image_2.png" /></figure>

# Ammonia in Paris derived from ground-based open-path and satellite observations

Camille Viatte<fnref n="1" />, Nadir Guendouz<fnref n="1" />, Clarisse Dufaux<fnref n="1" />, Arjan Hensen<fnref n="2" />, Daan Swart<fnref n="3" />, Martin Van Damme<fnref n="4" />,<fnref n="5" />, Lieven Clarisse<fnref n="4" />, Pierre Coheur<fnref n="4" />, and Cathy Clerbaux<fnref n="1" />,<fnref n="4" />

Ammonia (NH₃) is an important air pollutant which, as precursor of fine particulate matter, raises public health issues. This study analyzes 2.5-years of NH₃ observations derived from ground-based (miniDOAS) and satellite (IASI) remote sensing instruments to quantify, for the first time, temporal variabilities (from interannual to diurnal) of NH₃ concentrations in Paris.

The IASI and miniDOAS datasets are found to be in relatively good agreement (R>0.70) when atmospheric NH₃ concentrations are high and driven by regional agricultural activities. Over the investigated period (January 2020 – June 2022), NH₃ average concentrations in Paris measured by the miniDOAS and IASI are 2.23 µg.m⁻<fnref n="3" /> and 7.10x10¹<fnref n="5" /> molecules.cm⁻<fnref n="2" />, respectively, which are lower or equivalent to those documented in other urban areas. The seasonal and monthly variabilities of NH₃ concentrations in Paris are driven by sporadic agricultural emissions influenced by meteorological conditions, with NH₃ concentrations in spring up to 2 times higher than in other seasons.

The potential source contribution function (PSCF) reveals that the close (100-200km) east and northeast regions of Paris constitute the most important potential emission source areas of NH₃ in the megacity.

Weekly cycles of NH₃ derived from satellite and ground-based observations show different ammonia sources in Paris. In spring, agriculture has a major influence on ammonia concentrations and, in the other seasons, multi-platform observations suggest that ammonia is also controlled by traffic-related emissions.

In Paris, the diurnal cycle of NH₃ concentrations is very similar to the one of NO₂, with morning enhancements coincident with intensified road traffic. NH₃ evening enhancements synchronous with rush hours are also monitored in winter and fall. NH₃ concentrations measured during the weekends are consistently lower than NH₃ concentrations measured during weekdays in summer

<footnote n="1">¹LATMOS, Sorbonne Université, Paris cedex 05, France (camille.viatte@latmos.ipsl.fr)</footnote>

<footnote n="2">²Netherlands Organisation for Applied Scientific Research (TNO), P.O. Box 15, 1755 ZG, Petten, the Netherlands</footnote>

<footnote n="3">³National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands</footnote>

<footnote n="4">⁴Université libre de Bruxelles (ULB), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Brussels, Belgium</footnote>

<footnote n="5">⁵BIRA-IASB - Belgian Institute for Space Aeronomy, Brussels, Belgium</footnote>
<figure><img src="image_2.png" /></figure>

# Ammonia in Paris derived from ground-based open-path and satellite observations

**Camille Viatte**<fnref n="1" />, Nadir Guendouz<fnref n="1" />, Clarisse Dufaux<fnref n="1" />, Arjan Hensen<fnref n="2" />, Daan Swart<fnref n="3" />, Martin Van Damme<fnref n="4" />,<fnref n="5" />, Lieven Clarisse<fnref n="4" />, Pierre Coheur<fnref n="4" />, and Cathy Clerbaux<fnref n="1" />,<fnref n="4" />

Ammonia (NH₃) is an important air pollutant which, as precursor of fine particulate matter, raises public health issues. This study analyzes 2.5-years of NH₃ observations derived from ground-based (miniDOAS) and satellite (IASI) remote sensing instruments to quantify, for the first time, temporal variabilities (from interannual to diurnal) of NH₃ concentrations in Paris.

The IASI and miniDOAS datasets are found to be in relatively good agreement (R>0.70) when atmospheric NH₃ concentrations are high and driven by regional agricultural activities. Over the investigated period (January 2020 – June 2022), NH₃ average concentrations in Paris measured by the miniDOAS and IASI are 2.23 µg.m⁻<fnref n="3" /> and 7.10x10¹<fnref n="5" /> molecules.cm⁻<fnref n="2" />, respectively, which are lower or equivalent to those documented in other urban areas. The seasonal and monthly variabilities of NH₃ concentrations in Paris are driven by sporadic agricultural emissions influenced by meteorological conditions, with NH₃ concentrations in spring up to 2 times higher than in other seasons.

The potential source contribution function (PSCF) reveals that the close (100-200km) east and northeast regions of Paris constitute the most important potential emission source areas of NH₃ in the megacity.

Weekly cycles of NH₃ derived from satellite and ground-based observations show different ammonia sources in Paris. In spring, agriculture has a major influence on ammonia concentrations and, in the other seasons, multi-platform observations suggest that ammonia is also controlled by traffic-related emissions.

In Paris, the diurnal cycle of NH₃ concentrations is very similar to the one of NO₂, with morning enhancements coincident with intensified road traffic. NH₃ evening enhancements synchronous with rush hours are also monitored in winter and fall. NH₃ concentrations measured during the weekends are consistently lower than NH₃ concentrations measured during weekdays in summer

<footnote n="1">¹LATMOS, Sorbonne Université, Paris cedex 05, France (camille.viatte@latmos.ipsl.fr)</footnote>

<footnote n="2">²Netherlands Organisation for Applied Scientific Research (TNO), P.O. Box 15, 1755 ZG, Petten, the Netherlands</footnote>

<footnote n="3">³National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands</footnote>

<footnote n="4">⁴Université libre de Bruxelles (ULB), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Brussels, Belgium</footnote>

<footnote n="5">⁵BIRA-IASB - Belgian Institute for Space Aeronomy, Brussels, Belgium</footnote>
and fall. This is a further evidence of a significant traffic source of NH₃ in Paris.
and fall. This is a further evidence of a significant traffic source of NH₃ in Paris.