Aerosol Inorganic Composition at a Tropical Site: Discrepancies Between Filter-Based Sampling and a Semi-Continuous Method

Trebs, Ivonne; Andreae, Meinrat O.; Elbert, Wolfgang; Mayol-Bracero, O. L.; Soto-Garcia, Lydia; Rudich, Yinon; Falkovich, Alla H.; Maenhaut, Willy; Artaxo, Paulo; Otjes, R.P.; Slanina, J.

doi:10.1080/02786820801992899

Cited by 15 publications

(14 citation statements)

References 61 publications

(98 reference statements)

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“… b References are as follows: 1, Artaxo et al [1990]; 2, Formenti et al [2001]; 3, Artaxo et al [2002]; 4, Guyon et al [2003c]; 5, Trebs et al [2005]; 6, Fuzzi et al [2007]; 7, Trebs et al [2008]; 8, Echalar et al [1998]; 9, Gerab et al [1998]; 10, Maenhaut et al [2002]; 11, Talbot et al [1990]; 12, Mace et al [2003]; 13, Artaxo et al [1988]; 14, Talbot et al [1988]; 15, Graham et al [2003a]; 16, Artaxo et al [1998]. …”

Section: Propertiesmentioning

confidence: 99%

“…1. In terms of instrumentation, positive and negative sampling artifacts can be introduced, especially for semivolatile compounds like ammonium nitrate, by swings in temperature and relative humidity during the long sampling periods required by many techniques when employed at the low particle mass concentrations characteristic of the Amazon Basin [ Solomon and Sioutas , 2008; Trebs et al , 2008]. The development of instrumentation that can overcome these obstacles in tropical environments is needed.…”

Section: Propertiesmentioning

confidence: 99%

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Sources and properties of Amazonian aerosol particles

et al. 2010

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[1] This review provides a comprehensive account of what is known presently about Amazonian aerosol particles and concludes by formulating outlook and priorities for further research. The review is organized to follow the life cycle of Amazonian aerosol particles. It begins with a discussion of the primary and secondary sources relevant to the Amazonian particle burden, followed by a presentation of the particle properties that characterize the mixed populations present over the Amazon Basin at different times and places. These properties include number and mass concentrations and distributions, chemical composition, hygroscopicity, and cloud nucleation ability. The review presents Amazonian aerosol particles in the context of natural compared to anthropogenic sources as well as variability with season and meteorology. This review is intended to facilitate an understanding of the current state of knowledge on Amazonian aerosol particles specifically and tropical continental aerosol particles in general and thereby to enhance future research in this area.

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Section: Propertiesmentioning

confidence: 99%

Section: Propertiesmentioning

confidence: 99%

Sources and properties of Amazonian aerosol particles

et al. 2010

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“…These studies rely on the hypothesis that the concentration reduction of one specific compound does not affect the others, which is not true due to lifetime differences between gas and aerosol phases induced by contrasted deposition rates; for instance, a reduction of sulfate increases the amount of FNH x available for the formation of nitrate that deposit less than HNO 3 (Davidson and Wu, 1990), which finally increases the TNO 3 reservoir. These difficulties may be overcome through the combined use of observations and deposition parameterizations in observation-based box models (Vayenas et al, 2005). As these models cannot integrate the whole complexity at stake in the atmosphere, CTMs are still needed to assess the nitrate formation regime and the PM response to precursors changes, but they require in turn validation by experimental data.…”

Section: Introductionmentioning

confidence: 99%

Assessing the ammonium nitrate formation regime in the Paris megacity and its representation in the CHIMERE model

et al. 2016

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Abstract. Secondary inorganic compounds represent a major fraction of fine aerosol in the Paris megacity. The thermodynamics behind their formation is now relatively well constrained but, due to sparse direct measurements of their precursors (in particular NH3 and HNO3), uncertainties remain on their concentrations and variability as well as the formation regime of ammonium nitrate (in terms of limited species among NH3 and HNO3) in urban environments such as Paris. This study presents the first urban background measurements of both inorganic aerosol compounds and their gaseous precursors during several months within the city of Paris. Intense agriculture-related NH3 episodes are observed in spring/summer while HNO3 concentrations remain relatively low, even during summer, which leads to a NH3-rich regime in Paris. The local formation of ammonium nitrate within the city appears low, despite high NOx emissions. The data set also allows evaluating the CHIMERE chemistry-transport model (CTM). Interestingly, the rather good results obtained on ammonium nitrates hide significant errors on gaseous precursors (e.g., mean bias of −75 and +195 % for NH3 and HNO3, respectively). This leads to a misrepresentation of the nitrate formation regime through a highly underestimated gas ratio metric (introduced by Ansari and Pandis, 1998) and a much higher sensitivity of nitrate concentrations to ammonia changes. Several uncertainty sources are investigated, pointing out the importance of better assessing both NH3 agricultural emissions and OH concentrations in the future. These results remind us of the caution required when using of CTMs for emission scenario analysis, highlighting the importance of prior diagnostic and dynamic evaluations.

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“…There are published comparisons between filter sampling and semicontinuous methods (e.g., Nie et al, 2010) but not with the commercially available MARGA. Trebs et al (2008) compared Amazonian ammonium, nitrate, chloride, and sulphate concentrations analyzed from filter samples with those measured with an instrument similar to MARGA. In the comparison, ammonium was the only cation, and in that instrument it was analyzed with FIA.…”

Section: U Makkonen Et Al: Semi-continuous Gas and Inorganic Aerosomentioning

confidence: 99%

Semi-continuous gas and inorganic aerosol measurements at a Finnish urban site: comparisons with filters, nitrogen in aerosol and gas phases, and aerosol acidity

et al. 2012

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Abstract. Concentrations of 5 gases (HCl, HNO 3 , HONO, NH 3 , SO 2 ) and 8 major inorganic ions in particles (Cl − , NO for Na + , 3.0 for Mg 2+ , and 3.0 for Ca 2+ and 0.90 for the MARGA vs. SO 2 monitor. For K + there were not enough data points to calculate a statistically significant linear regression. There were clear seasonal cycles in the concentrations of the nitrogen-containing gases: the median concentrations of HNO 3 , HONO, and NH 3 were 0.09 ppb, 0.37 ppb, and 0.01 ppb in winter, respectively, and 0.15, 0.15, and 0.14 in spring, respectively. The gas-phase fraction of nitrogen decreased roughly with decreasing temperature, so that in the coldest period from January to February the median contribution was 28 % but in April to May was 53 %. There were also large fractionation variations that temperature alone cannot explain. HONO correlated well with NO x but a large fraction of the HONO-to-NO x ratios were larger than published ratios in a road traffic tunnel, suggesting that a large amount of HONO had other sources than vehicle exhaust. Aerosol acidity was estimated by calculating ion equivalent ratios. The sources of acidic aerosols were studied with trajectory statistics that showed that continental aerosol is mainly neutralized and marine aerosol acidic.

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Aerosol Inorganic Composition at a Tropical Site: Discrepancies Between Filter-Based Sampling and a Semi-Continuous Method

Cited by 15 publications

References 61 publications

Sources and properties of Amazonian aerosol particles

Sources and properties of Amazonian aerosol particles

Assessing the ammonium nitrate formation regime in the Paris megacity and its representation in the CHIMERE model

Semi-continuous gas and inorganic aerosol measurements at a Finnish urban site: comparisons with filters, nitrogen in aerosol and gas phases, and aerosol acidity

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