Intercomparison of VACC- and AMS-derived nitrate, sulphate and ammonium aerosol loadings during ADRIEX

Brooks, Barbara; McQuaid, James B.; Smith, Michael H.; Crosier, Jonathan; Coe, Hugh; Osborne, S.

doi:10.1002/qj.90

Cited by 10 publications

(10 citation statements)

References 15 publications

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“…The spectra in Figure 6 show that all three aerosol counters (PCASP, GRIMM and VACC) provided a consistent and reliable measurement of aerosol size distribution. Brooks et al (2007) show a comparison of VACC and PCASID size distributions from flight B050, highlighting the good agreement between the two probes.…”

Section: Validation Of Optical Properties Using Aircraft Observationsmentioning

confidence: 81%

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In situ and remote-sensing measurements of the mean microphysical and optical properties of industrial pollution aerosol during ADRIEX

Osborne

Haywood

2007

Q.J.R. Meteorol. Soc.

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ABSTRACT:We present a summary of the principal physical and optical properties of aerosol particles using the FAAM BAE-146 instrumented aircraft during ADRIEX between 27 August and 6 September 2004, augmented by sunphotometer, lidar and satellite retrievals. Observations of anthropogenic aerosol, principally from industrial sources, were concentrated over the northern Adriatic Sea and over the Po Valley close to the aerosol sources. An additional flight was also carried out over the Black Sea to compare east and west European pollution. Measurements show the single-scattering albedo of dry aerosol particles to vary considerably between 0.89 and 0.97 at a wavelength of 0.55 µm, with a campaign mean within the polluted lower free troposphere of 0.92. Although aerosol concentrations varied significantly from day to day and during individual days, the shape of the aerosol size distribution was relatively consistent through the experiment, with no detectable change observed over land and over sea. There is evidence to suggest that the pollution aerosol within the marine boundary layer was younger than that in the elevated layer. Trends in the aerosol volume distribution show consistency with multiple-site AERONET radiometric observations. The aerosol optical depths derived from aircraft measurements show a consistent bias to lower values than both the AERONET and lidar ground-based radiometric observations, differences which can be explained by local variations in the aerosol column loading and by some aircraft instrumental artefacts. Retrievals of the aerosol optical depth and fine-mode (<0.5 µm radius) fraction contribution to the optical depth using MODIS data from the Terra and Aqua satellites show a reasonable level of agreement with the AERONET and aircraft measurements.  Crown

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Section: Validation Of Optical Properties Using Aircraft Observationsmentioning

confidence: 81%

“…Use of the VACC data with the inlet temperature between 30 and 75°C provides us with dehydrated aerosol data. Brooks et al (2007) provides further information on the VACC.…”

Section: Instrumentationmentioning

confidence: 99%

In situ and remote-sensing measurements of the mean microphysical and optical properties of industrial pollution aerosol during ADRIEX

Osborne

Haywood

2007

Q.J.R. Meteorol. Soc.

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“…A combination of in situ aerosol measurements was made during ADRIEX using the FAAM aircraft. These included: number size distributions from a Passive Cavity Aerosol Spectrometer Probe (PCASP Model 100, 0.1-3 µm radius, PMS Inc.), scattering coefficient at 450, 550 and 700 nm from an integrating nephelometer (model 3563, TSI Inc.), absorption coefficient at 567 nm from a Particle Soot Absorption Photometer (PSAP, Radiance Research), total sub-micron number concentration from a Condensation Particle Counter (CPC, model 3010, TSI Inc.), and aerosol composition from online aerosol mass spectrometry, offline filter analysis, and Volatile Aerosol Concentration and Composition (VACC; Brooks et al, 2007) thermograms. A mixture of profiles, straight and level runs and orbits were conducted over both the Po Valley and Northern Adriatic Sea, in a manner similar to that flown by the Met Office C-130 aircraft during various missions -the Southern African Regional Science Initiative (SAFARI 2000;Haywood et al, 2003), the Saharan Dust Experiment, the Tropospheric Radiative Forcing Observational Experiment, and the second Aerosol Characterization Experiment (SHADE, TARFOX, ACE-2; Osborne and Haywood, 2005).…”

Section: Methodsmentioning

confidence: 99%

“…An overview of the ADRIEX campaign can be found in Highwood et al (2007), and in situ and remotely sensed optical and radiative properties of aerosol can be found in Osborne et al (2007), Cook et al (2007) and Barnaba et al (2007). Aerosol composition measurements derived from thermograms of optical size distributions taken during ADRIEX can be found in Brooks et al (2007).…”

Section: Introductionmentioning

confidence: 99%

Chemical composition of summertime aerosol in the Po Valley (Italy), northern Adriatic and Black Sea

Crosier

Allan

Coe

et al. 2007

Q.J.R. Meteorol. Soc.

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121

107

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ABSTRACT:The Aerosol Direct Radiative Impact Experiment was conducted over the Po Valley, the northern Adriatic and the Black Sea in summer 2004, with the aim of characterizing physical, chemical and optical properties of the ambient aerosols, and calculating its direct impact on the radiative balance of the region. The UK BAE-146 FAAM aircraft sampled in situ, while surface lidar and AERONET measurements were also taken. Ammonium sulphate and organics were found to dominate sub-micron aerosol composition when air-mass trajectories showed easterly flow. Under westerly anticyclonic flow, venting and recirculation of Po Valley surface air resulted in vertical stratification over both the Po Valley and northern Adriatic. Large ammonium nitrate concentrations were found in this recirculating air due to the large NO x and ammonium sources in the Po Valley. This large amount of ammonium nitrate makes a significant contribution to the regional radiative budget. Not only is it the most significant component mass in the column when Po Valley air flows over the Adriatic Sea, but the scattering will increase substantially due to additional amounts of water on aerosol particles rich in ammonium nitrate which are found in moist air masses. Organic aerosol mass was dominated by secondary material in both easterly and westerly conditions, with a relative reduction in the number of di-and poly-acidic functional groups in the nitrate-rich westerly air masses. Black Sea aerosol composition was dominated by ammonium sulphate and organic aerosol.

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“…In this study, the maximum particle diameter sized was 0.5 µm due to configuration of the tubing to the OPC in addition to transmission limitations of the Rosemount inlet, which has a 3 µm particle diameter upper limit. The volatility analysis assumes the physico-chemical characteristics of the sampled particles are constant over the scan period (Brooks et al, 2007).…”

Section: G Allen Et Al: South East Pacific Composition During Vocalmentioning

confidence: 99%

South East Pacific atmospheric composition and variability sampled along 20° S during VOCALS-REx

et al. 2011

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Abstract. The VAMOS Ocean-Cloud-Atmosphere-Land Regional Experiment (VOCALS-REx) was conducted from 15 October to 15 November 2008 in the South East Pacific (SEP) region to investigate interactions between land, sea and atmosphere in this unique tropical eastern ocean environment and to improve the skill of global and regional models in representing the region. This study synthesises selected aircraft, ship and surface site observations from VOCALSREx to statistically summarise and characterise the atmospheric composition and variability of the Marine Boundary Layer (MBL) and Free Troposphere (FT) along the 20 • S parallel between 70 • W and 85 • W. Significant zonal gradients in mean MBL sub-micron aerosol particle size and composition, carbon monoxide, sulphur dioxide and ozone were seen over the campaign, with a generally more variable and polluted coastal environment and a less variable, more pristine remote maritime regime. Gradients in aerosol and trace gas concentrations were observed to be associated with strong gradients in cloud droplet number. The FT wasCorrespondence to: G. Allen (grant.allen@manchester.ac.uk) often more polluted in terms of trace gases than the MBL in the mean; however increased variability in the FT composition suggests an episodic nature to elevated concentrations. This is consistent with a complex vertical interleaving of airmasses with diverse sources and hence pollutant concentrations as seen by generalised back trajectory analysis, which suggests contributions from both local and longrange sources. Furthermore, back trajectory analysis demonstrates that the observed zonal gradients both in the boundary layer and the free troposphere are characteristic of marked changes in airmass history with distance offshore -coastal boundary layer airmasses having been in recent contact with the local land surface and remote maritime airmasses having resided over ocean for in excess of ten days. Boundary layer composition to the east of 75 • W was observed to be dominated by coastal emissions from sources to the west of the Andes, with evidence for diurnal pumping of the Andean boundary layer above the height of the marine capping inversion. Analysis of intra-campaign variability in atmospheric composition was not found to be significantly correlated with observed low-frequency variability in the large scale flow pattern; campaign-average interquartile ranges of Published by Copernicus Publications on behalf of the European Geosciences Union. 5238 G. Allen et al.: South East Pacific composition during VOCALS-REx CO, SO 2 and O 3 concentrations at all longitudes were observed to dominate over much smaller differences in median concentrations calculated between periods of different flow regimes. The campaign climatology presented here aims to provide a valuable dataset to inform model simulation and future process studies, particularly in the context of aerosolcloud interaction and further evaluation of dynamical processes in the SEP region for conditions analogous to those during VOCALS-REx....

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Intercomparison of VACC- and AMS-derived nitrate, sulphate and ammonium aerosol loadings during ADRIEX

Cited by 10 publications

References 15 publications

In situ and remote-sensing measurements of the mean microphysical and optical properties of industrial pollution aerosol during ADRIEX

In situ and remote-sensing measurements of the mean microphysical and optical properties of industrial pollution aerosol during ADRIEX

Chemical composition of summertime aerosol in the Po Valley (Italy), northern Adriatic and Black Sea

South East Pacific atmospheric composition and variability sampled along 20° S during VOCALS-REx

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