Spatial variability in tropospheric peroxyacetyl nitrate in the tropics from infrared satellite observations in 2005 and 2006

Payne, Vivienne H.; Fischer, Emily V.; Worden, J.; Jiang, Zhe; Zhu, Liye; Kurosu, Thomas P.; Kulawik, S. S.

doi:10.5194/acp-17-6341-2017

Cited by 13 publications

(11 citation statements)

References 44 publications

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“…Our goal is to assess the potential for mountaintop PAN measurements to discriminate among model estimates of PAN and O 3 produced by regional anthropogenic emissions and transported to the mountaintop sites. We thus focus our analysis on April when measured PAN reaches its seasonal maximum (Penkett and Brice, 1986;Singh and Salas, 1989;Bottenheim et al, 1994;Schmitt and Volz-Thomas, 1997; Fig. S1) and when the HTAP1 models indicate that the production of PAN from the EA, EU, and NA source regions dominates total simulated PAN ( Fig.…”

Section: Multiyear Pan Measurements At Mountaintop Sites and Model Samentioning

confidence: 99%

Peroxy acetyl nitrate (PAN) measurements at northern midlatitude mountain sites in April: a constraint on continental source–receptor relationships

et al. 2018

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Abstract. Abundance-based model evaluations with observations provide critical tests for the simulated mean state in models of intercontinental pollution transport, and under certain conditions may also offer constraints on model responses to emission changes. We compile multiyear measurements of peroxy acetyl nitrate (PAN) available from five mountaintop sites and apply them in a proof-of-concept approach that exploits an ensemble of global chemical transport models (HTAP1) to identify an observational “emergent constraint”. In April, when the signal from anthropogenic emissions on PAN is strongest, simulated PAN at northern midlatitude mountaintops correlates strongly with PAN source–receptor relationships (the response to 20 % reductions in precursor emissions within northern midlatitude continents; hereafter, SRRs). This finding implies that PAN measurements can provide constraints on PAN SRRs by limiting the SRR range to that spanned by the subset of models simulating PAN within the observed range. In some cases, regional anthropogenic volatile organic compound (AVOC) emissions, tracers of transport from different source regions, and SRRs for ozone also correlate with PAN SRRs. Given the large observed interannual variability in the limited available datasets, establishing strong constraints will require matching meteorology in the models to the PAN measurements. Application of this evaluation approach to the chemistry–climate models used to project changes in atmospheric composition will require routine, long-term mountaintop PAN measurements to discern both the climatological SRR signal and its interannual variability.

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Section: Multiyear Pan Measurements At Mountaintop Sites and Model Samentioning

confidence: 99%

Peroxy acetyl nitrate (PAN) measurements at northern midlatitude mountain sites in April: a constraint on continental source–receptor relationships

et al. 2018

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“…Nonetheless, their geometry prevents the sampling of the lowest altitudes and hence does not allow direct investigation of VOC emissions and other processes affecting the bulk of their atmospheric content, which resides in the lower troposphere. The nadir-viewing TES (Tropospheric Emission Spectrometer) satellite sensor probes the low troposphere and allows retrieval of CH 3 OH, HCOOH, and PAN (e.g., Alvarado et al, 2011;Beer et al, 2008;Cady-Pereira et al, 2014Payne et al, 2014Payne et al, , 2017Shephard et al, 2015;Wells et al, 2012). However, sounders embarked on meteorological platforms offer a denser spatial sampling, more suitable for investigating the spatial heterogeneity and short-term evolution of highly variable VOCs.…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, these products have limitations in terms of reliability and error characterization, which are not easily addressed. Although IASI measurements of PAN have been reported in concentrated biomass burning and pollution plumes (Clarisse, Fromm, et al, 2011;Clarisse, R'Honi, et al, 2011;Coheur et al, 2009), and PAN TES data have been used to study Northern Eurasian and North American fires, long-range pollution transport, and year-to-year variations in the Tropics (Fischer et al, 2018;Jiang et al, 2016;Payne et al, 2017;Zhu et al, 2015Zhu et al, , 2017, no global daily distributions of PAN have been retrieved until now.…”

Section: Introductionmentioning

confidence: 99%

A General Framework for Global Retrievals of Trace Gases From IASI: Application to Methanol, Formic Acid, and PAN

et al. 2018

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Retrieving concentrations of minor atmospheric trace gases from satellite observations is challenging due to their weak spectral signature. Here we present a new version of the ANNI (Artificial Neural Network for Infrared Atmospheric Sounding Interferometer, IASI) retrieval framework, which relies on a hyperspectral range index (HRI) for the quantification of the gas spectral signature and on an artificial feedforward neural network to convert the HRI into a gas total column. We detail the different steps of the retrieval method, especially where they differ from previous work, and apply the retrieval to three important volatile organic compounds: methanol (CH3OH), formic acid (HCOOH), and peroxyacetyl nitrate (PAN). The comparison of the retrieved columns with those from an optimal estimation inversion retrieval shows an overall excellent agreement: differences occur mainly when the sensitivity to the target gas is low and are consistent with the conceptual differences between the two approaches. We present retrieval examples over selected regions, comparison with previously developed products, and the global seasonal distributions including the first global distributions of PAN on a daily basis. The ANNI retrieval has been carried out on the whole time series of IASI observations (2007–2018), so that currently over 10 years of twice‐daily global CH3OH, HCOOH, and PAN total column distributions have been produced. This unique data set opens avenues for tackling important questions related to sources, transport, and transformation of volatile organic compounds in the global atmosphere.

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“…Peroxyacetyl nitrate (PAN), a powerful pollutant formed in biomass-burning plumes (Wayne, 2000), is a secondary pollutant produced through the oxidation of hydrocarbons released from anthropogenic and biogenic sources. It is a reservoir of reactive nitrogen and plays a fundamental role in the global ozone budget (Tereszchuk et al, 2013;Payne et al, 2017). PAN can also be formed in the upper troposphere through the production of NO x from lightning (Zhao et al, 2009).…”

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confidence: 99%

Transport of trace gases via eddy shedding from the Asian summer monsoon anticyclone and associated impacts on ozone heating rates

et al. 2018

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Abstract. The highly vibrant Asian summer monsoon (ASM) anticyclone plays an important role in efficient transport of Asian tropospheric air masses to the extratropical upper troposphere and lower stratosphere (UTLS). In this paper, we demonstrate long-range transport of Asian trace gases via eddy-shedding events using MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) satellite observations, ERA-Interim reanalysis data and the ECHAM5-HAMMOZ global chemistry-climate model. Model simulations and observations consistently show that Asian boundary layer trace gases are lifted to UTLS altitudes in the monsoon anticyclone and are further transported horizontally eastward and westward by eddies detached from the anticyclone. We present an event of eddy shedding during 1-8 July 2003 and discuss a 1995-2016 climatology of eddy-shedding events. Our analysis indicates that eddies detached from the anticyclone contribute to the transport of Asian trace gases away from the Asian region to the western Pacific (20-30 • N, 120-150 • E) and western Africa (20-30 • N, 0-30 • E). Over the last two decades, the estimated frequency of occurrence of eddy-shedding events is ∼ 68 % towards western Africa and ∼ 25 % towards the western Pacific.Model sensitivity experiments considering a 10 % reduction in Asian emissions of non-methane volatile organic compounds (NMVOCs) and nitrogen oxides (NO x ) were performed with ECHAM5-HAMMOZ to understand the impact of Asian emissions on the UTLS. The model simulations show that transport of Asian emissions due to eddy shedding significantly affects the chemical composition of the upper troposphere (∼ 100-400 hPa) and lower stratosphere (∼ 100-80 hPa) over western Africa and the western Pacific. The 10 % reduction of NMVOCs and NO x Asian emissions leads to decreases in peroxyacetyl nitrate (PAN) (2 %-10 % near 200-80 hPa), ozone (1 %-4.5 % near ∼ 150 hPa) and ozone heating rates (0.001-0.004 K day −1 near 300-150 hPa) in the upper troposphere over western Africa and the western Pacific.

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Spatial variability in tropospheric peroxyacetyl nitrate in the tropics from infrared satellite observations in 2005 and 2006

Cited by 13 publications

References 44 publications

Peroxy acetyl nitrate (PAN) measurements at northern midlatitude mountain sites in April: a constraint on continental source–receptor relationships

Peroxy acetyl nitrate (PAN) measurements at northern midlatitude mountain sites in April: a constraint on continental source–receptor relationships

A General Framework for Global Retrievals of Trace Gases From IASI: Application to Methanol, Formic Acid, and PAN

Transport of trace gases via eddy shedding from the Asian summer monsoon anticyclone and associated impacts on ozone heating rates

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