Acetylene (C&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;) and hydrogen cyanide (HCN) from IASI satellite observations: global distributions, validation, and comparison with model

Duflot, Valentin; Wespes, Catherine; Clarisse, Lieven; Hurtmans, Daniel; Ngadi, Yasmine; Jones, Nicholas; Paton-Walsh, Clare; Hadji‐Lazaro, Juliette; Vigouroux, Corinne; Mazière, Martine De; Metzger, Jean‐Marc; Mahieu, Emmanuel; Servais, Christian; Hase, Frank; Schneider, Mat­thias; Clerbaux, Cathy; Coheur, Pierre‐François

doi:10.5194/acp-15-10509-2015

Cited by 10 publications

(11 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the Montreal Protocol has been implemented in 1989, a slowdown of the anthropogenic stratospheric depletion was observed (Strahan and Douglass, 2018). Even though O 3 recovers in the upper-and mid-stratosphere, a decline in lower stratospheric O 3 is observed by remote sensing measurements (Kyrölä et al, 2013;Nair et al, 2015;Vigouroux et al, 2015). Recently, a lower stratospheric O 3 decline of about 1.5 DU has been reported between 2001 and 2016 by Ball et al (2018, their Fig.…”

Section: The Influence Of In-cloud Ovoc Oxidation During the Indonesian Peatland Firesmentioning

confidence: 96%

“…The CO 2 line mixing in that range is accounted for as described by Duflot et al (2013). A first HRI of HCN was already set up for the IASI observations by Duflot et al (2015), but here we set up a new more sensitive one following the iterative procedure presented by Franco et al (2018).…”

Section: Appendix A: Hcn Retrievals From Iasi Observationsmentioning

confidence: 99%

“…In contrast to Duflot et al (2015), who used pre-calculated coefficients to link the HRI to the HCN total column, the ANNI v3 procedure implements an artificial feedforward NN for this purpose. Such a NN is set up to mimic in a comprehensive way the complex connections that exist between the HRI, the state of the atmosphere and Earth's surface, and the gas abundance.…”

Section: Appendix A: Hcn Retrievals From Iasi Observationsmentioning

confidence: 99%

See 2 more Smart Citations

Organic pollutants from tropical peatland fires: regional influences and its impact on lower stratospheric ozone

Rosanka

Franco

Clarisse

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. The particularly strong dry season in Indonesia in 2015, caused by an exceptional strong El Niño, led to severe peatland fires resulting in high volatile organic compound (VOC) biomass burning emissions. At the same time, the developing Asian monsoon anticyclone (ASMA) and the general upward transport in the intertropical convergence zone (ITCZ) efficiently transported the resulting primary and secondary pollutants to the upper troposphere/lower stratosphere (UTLS). In this study, we assess the importance of these VOC emissions for the composition of the lower troposphere and the UTLS, and we investigate the effect of in-cloud oxygenated VOC (OVOC) oxidation during such a strong pollution event. This is achieved by performing multiple chemistry simulations using the global atmospheric model ECHAM/MESSy (EMAC). By comparing modelled columns of the biomass burning marker hydrogen cyanide (HCN) to spaceborne measurements from the Infrared Atmospheric Sounding Interferometer (IASI), we find that EMAC properly captures the exceptional strength of the Indonesian fires. In the lower troposphere, the increase in VOC levels is higher in Indonesia compared to other biomass burning regions. This has a direct impact on the oxidation capacity, resulting in the largest regional reduction in hydroxyl radicals (OH) and nitrogen oxides (NOx). Even though an increase in ozone (O3) is predicted close to the peatland fires, particular high concentrations of phenols lead to an O3 depletion in eastern Indonesia. By employing the detailed in-cloud OVOC oxidation scheme Jülich Aqueous-phase Mechanism of Organic Chemistry (JAMOC), we find that the predicted changes are dampened and that by ignoring these processes, global models tend to overestimate the impact of such extreme pollution events. In the ASMA and the ITCZ, the upward transport leads to elevated VOC concentrations in the UTLS region, which results in a depletion of lower stratospheric O3. We find that this is caused by a high destruction of O3 by phenoxy radicals and by the increased formation of NOx reservoir species, which dampen the chemical production of O3. The Indonesian peatland fires regularly occur during El Niño years and contribute to the depletion of O3. In the time period from 2001 to 2016, we find that the lower stratospheric O3 is reduced by about 0.38 DU and contributes to about 25 % to the lower stratospheric O3 reduction observed by remote sensing. By not considering these processes, global models might not be able to reproduce this variability in lower stratospheric O3.

show abstract

Section: The Influence Of In-cloud Ovoc Oxidation During the Indonesian Peatland Firesmentioning

confidence: 96%

Section: Appendix A: Hcn Retrievals From Iasi Observationsmentioning

confidence: 99%

Section: Appendix A: Hcn Retrievals From Iasi Observationsmentioning

confidence: 99%

See 1 more Smart Citation

Organic pollutants from tropical peatland fires: regional influences and its impact on lower stratospheric ozone

Rosanka

Franco

Clarisse

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…This IASI dataset may also be used in the future to study a single plume at different times to inform on the loss during transport. Further insight into the transport and chemistry may be gained by using IASI's capability to measure several fire species simultaneously, such as HCN or C 2 H 2 (e.g., Duflot et al, 2015). This would be useful for the characterization of the chemistry ongoing in a fire plume outflow.…”

Section: Discussionmentioning

confidence: 99%

Determination of enhancement ratios of HCOOH relative to CO in biomass burning plumes by the Infrared Atmospheric Sounding Interferometer (IASI)

2017

View full text Add to dashboard Cite

Abstract. Formic acid (HCOOH) concentrations are often underestimated by models, and its chemistry is highly uncertain. HCOOH is, however, among the most abundant atmospheric volatile organic compounds, and it is potentially responsible for rain acidity in remote areas. HCOOH data from the Infrared Atmospheric Sounding Interferometer (IASI) are analyzed from 2008 to 2014 to estimate enhancement ratios from biomass burning emissions over seven regions. Fire-affected HCOOH and CO total columns are defined by combining total columns from IASI, geographic location of the fires from Moderate Resolution Imaging Spectroradiometer (MODIS), and the surface wind speed field from the European Centre for Medium-Range Weather Forecasts (ECMWF). Robust correlations are found between these fire-affected HCOOH and CO total columns over the selected biomass burning regions, allowing the calculation of enhancement ratios equal to 7.30 × 10 −3 ± 0.08 × 10 −3 mol mol −1 over Amazonia (AMA), 11.10 × 10 −3 ± 1.37 × 10 −3 mol mol −1 over Australia (AUS), 6.80 × 10 −3 ± 0.44 × 10 −3 mol mol −1 over India (IND), 5.80 × 10 −3 ± 0.15 × 10 −3 mol mol −1 over Southeast Asia (SEA), 4.00 × 10 −3 ± 0.19 × 10 −3 mol mol −1 over northern Africa (NAF), 5.00 × 10 −3 ± 0.13 × 10 −3 mol mol −1 over southern Africa (SAF), and 4.40 × 10 −3 ± 0.09 × 10 −3 mol mol −1 over Siberia (SIB), in a fair agreement with previous studies. In comparison with referenced emission ratios, it is also shown that the selected agricultural burning plumes captured by IASI over India and Southeast Asia correspond to recent plumes where the chemistry or the sink does not occur. An additional classification of the enhancement ratios by type of fuel burned is also provided, showing a diverse origin of the plumes sampled by IASI, especially over Amazonia and Siberia. The variability in the enhancement ratios by biome over the different regions show that the levels of HCOOH and CO do not only depend on the fuel types.

show abstract

“…Rosanka et al (2021a) showed that the in-cloud OVOC oxidation has a significant impact on the predicted concentrations of VOCs, key oxidants, and O 3 . In the past, global atmospheric chemistry models were not capable of representing this process explicitly or in its full complexity (Ervens, 2015). However, the recently developed Jülich Aqueous-phase Mechanism of Organic Chemistry (JAMOC, Rosanka et al, 2021a, b) comprises an advanced in-cloud OVOC oxidation scheme suitable to be used in the ECHAM/MESSy Atmospheric Chemistry (EMAC, Jöckel et al, 2010) model.…”

mentioning

confidence: 99%

The impact of organic pollutants from Indonesian peatland fires on the tropospheric and lower stratospheric composition

Rosanka¹,

Franco

Clarisse

et al. 2021

Atmos. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

Abstract. The particularly strong dry season in Indonesia in 2015, caused by an exceptionally strong El Niño, led to severe peatland fires resulting in high volatile organic compound (VOC) biomass burning emissions. At the same time, the developing Asian monsoon anticyclone (ASMA) and the general upward transport in the Intertropical Convergence Zone (ITCZ) efficiently transported the resulting primary and secondary pollutants to the upper troposphere and lower stratosphere (UTLS). In this study, we assess the importance of these VOC emissions for the composition of the lower troposphere and the UTLS and investigate the effect of in-cloud oxygenated VOC (OVOC) oxidation during such a strong pollution event. This is achieved by performing multiple chemistry simulations using the global atmospheric model ECHAM/MESSy (EMAC). By comparing modelled columns of the biomass burning marker hydrogen cyanide (HCN) and carbon monoxide (CO) to spaceborne measurements from the Infrared Atmospheric Sounding Interferometer (IASI), we find that EMAC properly captures the exceptional strength of the Indonesian fires. In the lower troposphere, the increase in VOC levels is higher in Indonesia compared to other biomass burning regions. This has a direct impact on the oxidation capacity, resulting in the largest regional reduction in the hydroxyl radical (OH) and nitrogen oxides (NOx). While an increase in ozone (O3) is predicted close to the peatland fires, simulated O3 decreases in eastern Indonesia due to particularly high phenol concentrations. In the ASMA and the ITCZ, the upward transport leads to elevated VOC concentrations in the lower stratosphere, which results in the reduction of OH and NOx and the increase in the hydroperoxyl radical (HO2). In addition, the degradation of VOC emissions from the Indonesian fires becomes a major source of lower stratospheric nitrate radicals (NO3), which increase by up to 20 %. Enhanced phenol levels in the upper troposphere result in a 20 % increase in the contribution of phenoxy radicals to the chemical destruction of O3, which is predicted to be as large as 40 % of the total chemical O3 loss in the UTLS. In the months following the fires, this loss propagates into the lower stratosphere and potentially contributes to the variability of lower stratospheric O3 observed by satellite retrievals. The Indonesian peatland fires regularly occur during El Niño years, and the largest perturbations of radical concentrations in the lower stratosphere are predicted for particularly strong El Niño years. By activating the detailed in-cloud OVOC oxidation scheme Jülich Aqueous-phase Mechanism of Organic Chemistry (JAMOC), we find that the predicted changes are dampened. Global models that neglect in-cloud OVOC oxidation tend to overestimate the impact of such extreme pollution events on the atmospheric composition.

show abstract

Acetylene (C<sub>2</sub>H<sub>2</sub>) and hydrogen cyanide (HCN) from IASI satellite observations: global distributions, validation, and comparison with model

Cited by 10 publications

References 70 publications

Organic pollutants from tropical peatland fires: regional influences and its impact on lower stratospheric ozone

Organic pollutants from tropical peatland fires: regional influences and its impact on lower stratospheric ozone

Determination of enhancement ratios of HCOOH relative to CO in biomass burning plumes by the Infrared Atmospheric Sounding Interferometer (IASI)

The impact of organic pollutants from Indonesian peatland fires on the tropospheric and lower stratospheric composition

Contact Info

Product

Resources

About