Enhancement of the aerosol direct radiative effect by semi-volatile aerosol components: airborne measurements in North-Western Europe

Morgan, William T.; Allan, J. D.; Bower, Keith; Esselborn, Michael; Harris, Bethan L.; Henzing, Bas; Highwood, Eleanor J.; Kiendler‐Scharr, Astrid; McMeeking, G. R.; Mensah, A. A.; Northway, M. J.; Osborne, S.; Williams, P. I.; Krejci, Radovan; Coe, Hugh

doi:10.5194/acp-10-8151-2010

Cited by 113 publications

(118 citation statements)

References 74 publications

(89 reference statements)

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“…9a) were uncorrelated (R 2 = 0.14), while γ and Fo (OM / (OM + NO Yangtze River Delta) (Shi et al, 2014) and Beijing (Sun et al, 2012). This may partly result from the increasing availability of NH 3 to form NH 4 NO 3 (Morgan et al, 2010) due to the decrease of SO 2 . The Chinese government has put an emphasis on the control of SO 2 emissions in recent years, and desulfurization technology has been installed at coal-fired power units as well as certain steel and cement production facilities.…”

Section: The Relationship Of Scattering Enhancement Factor With Chemimentioning

confidence: 94%

Observations of relative humidity effects on aerosol light scattering in the Yangtze River Delta of China

et al. 2015

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Abstract. Scattering of solar radiation by aerosol particles is highly dependent on relative humidity (RH) as hygroscopic particles take up water with increasing RH. To achieve a better understanding of the effect of aerosol hygroscopic growth on light scattering properties and radiative forcing, the aerosol scattering coefficients at RH in the range of 40 to ∼ 90 % were measured using a humidified nephelometer system in the Yangtze River Delta of China in March 2013. In addition, the aerosol size distribution and chemical composition were measured. During the observation period, the mean and standard deviation (SD) of enhancement factors at RH = 85 % for the scattering coefficient (f (85 %)), backscattering coefficient (f b (85 %)), and hemispheric backscatter fraction (f β (85 %)) were 1.58 ± 0.12, 1.25 ± 0.07, and 0.79 ± 0.04, respectively, i.e., aerosol scattering coefficient and backscattering coefficient increased by 58 and 25 % as the RH increased from 40 to 85 %. Concurrently, the aerosol hemispheric backscatter fraction decreased by 21 %. The relative amount of organic matter (OM) or inorganics in PM 1 was found to be a main factor determining the magnitude of f (RH). The highest values of f (RH) corresponded to the aerosols with a small fraction of OM, and vice versa. The relative amount of NO − 3 in fine particles was strongly correlated with f (85 %), which suggests that NO − 3 played a vital role in aerosol hygroscopic growth during this study. The mass fraction of nitrate also had a close relationship to the curvature of the humidograms; higher mass fractions of nitrate were associated with humidograms that had the least curvature. Aerosol hygroscopic growth caused a 47 % increase in the calculated aerosol direct radiative forcing at 85 % RH, compared to the forcing at 40 % RH.

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Section: The Relationship Of Scattering Enhancement Factor With Chemimentioning

confidence: 94%

Observations of relative humidity effects on aerosol light scattering in the Yangtze River Delta of China

et al. 2015

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“…Airborne measurements revealed complex partitioning of the semi-volatile aerosol components in the planetary boundary layer. Measurements revealed an increase in secondary aerosol mass with an increasing altitude in the boundary layer, causing an increase of the aerosol direct radiative forcing (Morgan et al, 2010a). Specifically, in-situ measurements in the vicinity of a ground-based measurement site at Cabauw, the Netherlands, showed that ammonium nitrate was the dominant chemical component aloft, while at the ground OA dominated.…”

Section: Sub-micron Aerosol Chemical Compositionmentioning

confidence: 99%

General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales

et al. 2011

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Abstract. In this paper we describe and summarize the main achievements of the European Aerosol Cloud Climate and Air Quality Interactions project (EUCAARI). EUCAARI started on 1 January 2007 and ended on 31 December 2010 leaving a rich legacy including: (a) a comprehensive database with a year of observations of the physical, chemical and optical properties of aerosol particles over Europe, (b) comprehensive aerosol measurements in four developing countries, (c) a database of airborne measurements of aerosols and clouds over Europe during May 2008, (d) comprehensive modeling tools to study aerosol processes fron nano to global scale and their effects on climate and air quality. In addition a new Pan-European aerosol emissions inventory was developed and evaluated, a new cluster spectrometer was built and tested in the field and several new aerosol parameterizations and computations modules for chemical transport and global climate models were developed and evaluated. These achievements and related studies have substantially improved our understanding and reduced the uncertainties of aerosol radiative forcing and air quality-climate interactions. The EUCAARI results can be utilized in European and global environmental policy to assess the aerosol impacts and the corresponding abatement strategies.

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“…While the M 30 may be due to nitro-aromatics that have been associated with biomass burning (Mohr et al, 2013), the vertical trends presented here do not match with the rBC, so it is not thought to be the case here. The structure in B744-5 is probably due to the ammonium nitrate present during these flights, which will peak in concentration at the top of the boundary layer (Morgan et al, 2010a;Morgan et al, 2009) and suppress the ratio through an inorganic NO + contribution to M 30 .…”

Section: Vertical Structurementioning

confidence: 99%

“…The positive gradient through the boundary layer (featuring a doubling of Org 82 from 20 to 40 ng m −3 ) could be as a result of the repartitioning of semivolatile material into the aqueous phase due to the reduced temperature and increased particulate water content (Morgan et al, 2010a). This would be consistent with the observations of Fu et al (2010), who found an increase in isoprene SOA tracers at night-time at an elevated site in China, and the modelling work of Henze and Seinfeld (2006), who predict enhanced partitioning to the particle phase at higher altitudes.…”

Section: Boundary Layer Profilementioning

confidence: 99%

Airborne observations of IEPOX-derived isoprene SOA in the Amazon during SAMBBA

et al. 2014

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Abstract. Isoprene is a potentially highly significant but currently poorly quantified source of secondary organic aerosols (SOA). This is especially important in the tropics, where large rainforests act as significant sources of isoprene. Methylfuran, produced through thermal decomposition during analysis, has recently been suggested as a marker for isoprene SOA formation through the isoprene epoxydiol (IEPOX) route, which mostly occurs under low NO x conditions. This is manifested as a peak at m/z = 82 in Aerodyne Aerosol Mass Spectrometer (AMS) data. Here we present a study of this marker measured during five flights over the Amazon rainforest on board the UK Facility for Airborne Atmospheric Measurement (FAAM) BAe-146 research aircraft during the South American Biomass Burning Analysis (SAMBBA) campaign. Cases where this marker is and is not present are contrasted and linked to the presence of acidic seed particles, lower NO x concentrations and higher humidities. There are also data to suggest a role of organic nitrogen in the particulate composition. Furthermore, an inspection of the vertical trends of the marker indicates that concentrations are highest at the top of the boundary layer (possibly due to semivolatile repartitioning) and that upwards through the free troposphere, the mass spectral profile evolves towards that of low volatility oxygenated aerosol. These observations offer insights into the behaviour of IEPOX-derived SOA formation above the Amazon rainforest and the suitability of methylfuran as a marker for this process.

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Enhancement of the aerosol direct radiative effect by semi-volatile aerosol components: airborne measurements in North-Western Europe

Abstract: Abstract.A case study of atmospheric aerosol mea-

Cited by 113 publications

References 74 publications

Observations of relative humidity effects on aerosol light scattering in the Yangtze River Delta of China

Observations of relative humidity effects on aerosol light scattering in the Yangtze River Delta of China

General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales

Airborne observations of IEPOX-derived isoprene SOA in the Amazon during SAMBBA

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