Patrick Dewald
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View article: Impacts of summertime photochemical aging on the physicochemical properties of aerosols in a Paris suburban forest region
Impacts of summertime photochemical aging on the physicochemical properties of aerosols in a Paris suburban forest region Open
Organic Aerosols (OA), which significantly affect the climate system and human health, often contain a substantial fraction of atmospherically processed species known as Oxygenated Organic Aerosol (OOA). However, the formation pathways and…
View article: Short-lived organic nitrates in a suburban temperate forest: an indication of efficient assimilation of reactive nitrogen by the biosphere?
Short-lived organic nitrates in a suburban temperate forest: an indication of efficient assimilation of reactive nitrogen by the biosphere? Open
Alkyl nitrates (ANs) and peroxycarboxylic nitric anhydrides (PANs) are important reservoirs of reactive nitrogen that contribute significantly to the rate of formation and growth of secondary organic aerosols and support the transport of r…
View article: Influence of ambient NO and NO <sub>2</sub> on the quantification of total peroxy nitrates (ΣPNs) and total alkyl nitrates (ΣANs) by thermal dissociation cavity ring-down spectroscopy (TD-CRDS)
Influence of ambient NO and NO <sub>2</sub> on the quantification of total peroxy nitrates (ΣPNs) and total alkyl nitrates (ΣANs) by thermal dissociation cavity ring-down spectroscopy (TD-CRDS) Open
Measurement of total peroxy nitrates (ΣPNs) and alkyl nitrates (ΣANs) by instruments that use thermal dissociation (TD) inlets to convert the organic nitrate to detectable NO2 may suffer from systematic bias (both positive and negative) re…
View article: Influence of ambient NO and NO <sub>2</sub> on the quantification of total peroxy nitrates (∑PNs) and total alkyl nitrates (∑ANs) by thermal dissociation cavity ring-down spectroscopy (TD-CRDS)
Influence of ambient NO and NO <sub>2</sub> on the quantification of total peroxy nitrates (∑PNs) and total alkyl nitrates (∑ANs) by thermal dissociation cavity ring-down spectroscopy (TD-CRDS) Open
Measurement of total peroxy nitrates (∑PNs) and alkyl nitrates (∑ANs) by instruments that use thermal dissociation (TD) inlets to convert the organic nitrate to detectable NO2 may suffer from systematic bias (both positive and negative) re…
View article: Short lifetimes of organic nitrates in a sub-urban temperate forest indicate efficient assimilation of reactive nitrogen by the biosphere
Short lifetimes of organic nitrates in a sub-urban temperate forest indicate efficient assimilation of reactive nitrogen by the biosphere Open
Alkyl nitrates (ANs) and peroxycarboxylic nitric anhydrides (PANs) are important reservoirs of reactive nitrogen that contribute significantly to the rate of formation and growth of secondary organic aerosols and support the transport of r…
View article: Measurement report: Sources, sinks, and lifetime of NO <sub> <i>x</i> </sub> in a suburban temperate forest at night
Measurement report: Sources, sinks, and lifetime of NO <sub> <i>x</i> </sub> in a suburban temperate forest at night Open
The budget of reactive nitrogen species, which play a central role in atmospheric chemistry (e.g. in photochemical O3 production), is poorly understood in forested regions. In this study, through observations of NO, NO2, NOy, and O3 in the…
View article: NO <sub>3</sub> reactivity during a summer period in a temperate forest below and above the canopy
NO <sub>3</sub> reactivity during a summer period in a temperate forest below and above the canopy Open
We present direct measurements of biogenic volatile organic compound (BVOC)-induced nitrate radical (NO3) reactivity (kVOC) through the diel cycle in the suburban, temperate forest of Rambouillet near Paris (France). The data were obtained…
View article: NO <sub>3</sub> reactivity during a summer period in a temperate forest below and above the canopy
NO <sub>3</sub> reactivity during a summer period in a temperate forest below and above the canopy Open
We present direct measurements of BVOC-induced nitrate radical (NO3) reactivity (kVOC) through the diel cycle in the suburban, temperate forest of Rambouillet near Paris (France). The data were obtained in a six-week summer period in 2022 …
View article: Measurement report: Sources, sinks and lifetime of NO <sub>X</sub> in a sub-urban temperate forest at night
Measurement report: Sources, sinks and lifetime of NO <sub>X</sub> in a sub-urban temperate forest at night Open
Through observations of NO, NO2, NOY and O3 in the Rambouillet forest near Paris, France, (as part of the ACROSS campaign, 2022) we have gained insight into nighttime processes controlling NOX in an anthropogenically impacted forest enviro…
View article: Comparison of isoprene chemical mechanisms under atmospheric night-time conditions in chamber experiments: evidence of hydroperoxy aldehydes and epoxy products from NO <sub>3</sub> oxidation
Comparison of isoprene chemical mechanisms under atmospheric night-time conditions in chamber experiments: evidence of hydroperoxy aldehydes and epoxy products from NO <sub>3</sub> oxidation Open
The gas-phase reaction of isoprene with the nitrate radical (NO3) was investigated in experiments in the outdoor SAPHIR chamber under atmospherically relevant conditions specifically with respect to the chemical lifetime and fate of nitrat…
View article: Data quality enhancement for field experiments in atmospheric chemistry via sequential Monte Carlo filters
Data quality enhancement for field experiments in atmospheric chemistry via sequential Monte Carlo filters Open
In this study, we explore the applications and limitations of sequential Monte Carlo (SMC) filters to field experiments in atmospheric chemistry. The proposed algorithm is simple, fast, versatile and returns a complete probability distribu…
View article: Investigation of Organic Nitrates in a European Temperate Forest
Investigation of Organic Nitrates in a European Temperate Forest Open
Biogenic volatile organic compounds (BVOCs) are to a great extent oxidized by NO3 radicals at night leading to the formation of organic nitrates and secondary organic aerosols (SOA), which have an impact on human health and air quality. On…
View article: First ground-deployment of a new small-footprintcavity-ring-down spectrometer for NO3 and N2O5 in a temperate forest during the ACROSS campaign
First ground-deployment of a new small-footprintcavity-ring-down spectrometer for NO3 and N2O5 in a temperate forest during the ACROSS campaign Open
At nighttime, when concentrations of the OH-radical are low, the nitrate radical, NO3, over takes the role of major initiator of the oxidation of many organic trace gases, especially those containing one or more double bonds. In contrast t…
View article: NO3 reactivity in a temperate forest impacted by anthropogenic and biogenic emissions during the ACROSS campaign
NO3 reactivity in a temperate forest impacted by anthropogenic and biogenic emissions during the ACROSS campaign Open
Terpenoids are readily released into the environment via biogenic emissions. One of their major nighttime oxidizing agent is the nitrate radical (NO3), which is formed from the reaction between ozone (O3) and nitrogen dioxide (NO2). The NO…
View article: NO <sub>3</sub> reactivity measurements in an indoor environment: a pilot study
NO <sub>3</sub> reactivity measurements in an indoor environment: a pilot study Open
First indoor NO 3 reactivity measurement confirms that NO 3 is a significant indoor oxidizing agent.
View article: Comment on egusphere-2022-1080
Comment on egusphere-2022-1080 Open
Abstract. In this study we explore the applications and limitations of Sequential Monte Carlo filters (SMC) to atmospheric chemistry field experiments. The proposed algorithm is simple, fast, versatile and returns a complete probability di…
View article: Data Quality Enhancement for Atmospheric Chemistry Field Experiments via Sequential Monte Carlo Filters
Data Quality Enhancement for Atmospheric Chemistry Field Experiments via Sequential Monte Carlo Filters Open
In this study we explore the applications and limitations of Sequential Monte Carlo filters (SMC) to atmospheric chemistry field experiments. The proposed algorithm is simple, fast, versatile and returns a complete probability distribution…
View article: Comment on egusphere-2022-587
Comment on egusphere-2022-587 Open
Abstract. The gas-phase reaction of isoprene with the nitrate radical (NO3) was investigated in experiments in the outdoor SAPHIR chamber at atmospherically relevant conditions specifically with respect to the chemical lifetime and fate of…
View article: Modelled OH reactivity
Modelled OH reactivity Open
Abstract. The gas-phase reaction of isoprene with the nitrate radical (NO3) was investigated in experiments in the outdoor SAPHIR chamber at atmospherically relevant conditions specifically with respect to the chemical lifetime and fate of…
View article: Comment on egusphere-2022-587
Comment on egusphere-2022-587 Open
Abstract. The gas-phase reaction of isoprene with the nitrate radical (NO3) was investigated in experiments in the outdoor SAPHIR chamber at atmospherically relevant conditions specifically with respect to the chemical lifetime and fate of…
View article: Comparison of isoprene chemical mechanisms at atmospheric night-time conditions in chamber experiments: Evidence of hydroperoxy aldehydes and epoxy products from NO <sub>3</sub> oxidation
Comparison of isoprene chemical mechanisms at atmospheric night-time conditions in chamber experiments: Evidence of hydroperoxy aldehydes and epoxy products from NO <sub>3</sub> oxidation Open
The gas-phase reaction of isoprene with the nitrate radical (NO3) was investigated in experiments in the outdoor SAPHIR chamber at atmospherically relevant conditions specifically with respect to the chemical lifetime and fate of nitrato-o…
View article: Fate of the nitrate radical at the summit of a semi-rural mountain site in Germany assessed with direct reactivity measurements
Fate of the nitrate radical at the summit of a semi-rural mountain site in Germany assessed with direct reactivity measurements Open
The reactivity of NO3 plays an important role in modifying the fate of reactive nitrogen species at nighttime. High reactivity (e.g. towards unsaturated volatile organic compounds – VOCs) can lead to formation of organic nitrates and secon…
View article: Reply on RC1
Reply on RC1 Open
Abstract. The reactivity of NO3 plays an important role in modifying the fate of reactive nitrogen species at nighttime. High reactivity (e.g. towards unsaturated volatile organic compounds – VOCs) can lead to formation of organic nitrates…
View article: Reply on RC2
Reply on RC2 Open
Abstract. The reactivity of NO3 plays an important role in modifying the fate of reactive nitrogen species at nighttime. High reactivity (e.g. towards unsaturated volatile organic compounds â VOCs) can lead to formation of organic nitrat…