Recommendations for reporting &amp;quot;black carbon&amp;quot; measurements

Petzold, A.; Ogren, J. A.; Fiebig, Markus; Laj, P.; Li, Samuel; Baltensperger, Urs; Popp, Thomas; Kinne, Stefan; Pappalardo, Gelsomina; Sugimoto, Naoki; Wehrli, Christoph; Wiedensohler, Alfred; Zhang, Xiaoye

doi:10.5194/acp-13-8365-2013

Cited by 953 publications

(845 citation statements)

References 112 publications

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“…The mentioned nomenclature is in accordance with the one compiled by Petzold et al (2013). A list of frequently used acronyms and symbols can be found in Table 1.…”

mentioning

confidence: 83%

Black and brown carbon over central Amazonia: Long-term aerosol measurements at the ATTO site

Saturno¹,

Holanda²,

Pöhlker³

et al. 2017

Preprint

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Abstract. The Amazon rain forest is considered a very sensitive ecosystem that could be significantly affected by a changing climate. It is still one of the few places on Earth where the atmosphere in the continent approaches near-pristine conditions for some periods of the year. The Amazon Tall Tower Observatory (ATTO) has been built in central Amazonia to monitor the atmospheric and forest ecosystem conditions. The atmospheric conditions at the ATTO site oscillate between biogenic and biomass burning (BB) dominated states. By using a comprehensive ground-based aerosol measurement setup, we studied the physical and chemical properties of aerosol particles at the ATTO site. This parameterization of å abs as a function of the BC to OA mass ratio was investigated and was found applicable to tropical forest emissions but further investigation is required, especially by segregating fuel types. Additionally, important enhancements of the BC mass absorption cross-section (α abs ) were found over the measurement period. This enhancement could be linked to heavy coating of the BC aerosol particles. In the future, the BC mixing state should be systematically investigated by using different instrumental approaches.

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“…The mentioned nomenclature is in accordance with the one compiled by Petzold et al (2013). A list of frequently used acronyms and symbols can be found in Table 1.…”

mentioning

confidence: 83%

Black and brown carbon over central Amazonia: Long-term aerosol measurements at the ATTO site

Saturno¹,

Holanda²,

Pöhlker³

et al. 2017

Preprint

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“…The instrumentation used was the micro-aethalometer (MicroAeth Model AE51, Aethlabs) to monitor BC. This instrument measures the concentration of optically absorbing aerosol particles (equivalent black carbon (EBC, in µg m −3 ) using a mass-specific absorption cross-section (MAC) of 12.47 m 2 g −1 at 880 nm (Petzold et al, 2013)) by the rate of change in light attenuation of a particle spot on a filter through which air is pumped. The filter ticket was changed at the start of each measurement day, the inlet flow rate was set at 150 mL min −1 and measurements were made at a temporal resolution of one second.…”

Section: Mobile Monitoring Campaignmentioning

confidence: 99%

Mobile monitoring for mapping spatial variation in urban air quality: Development and validation of a methodology based on an extensive dataset

Bossche

Peters

Verwaeren

et al. 2015

Atmospheric Environment

195

132

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Mobile monitoring is increasingly used as an additional tool to acquire air quality data at a high spatial resolution. However, given the high temporal variability of urban air quality, a limited number of mobile measurements may only represent a snapshot and not be representative. In this study, the impact of this temporal variability on the representativeness is investigated and a methodology to map urban air quality using mobile monitoring is developed and evaluated.A large set of black carbon (BC) measurements was collected in Antwerp, Belgium, using a bicycle equipped with a portable BC monitor (micro-aethalometer). The campaign consisted of 256 and 96 runs along two fixed routes (2 and 5 km long). Large gradients over short distances and differences up to a factor of 10 in mean BC concentrations aggregated at a resolution of 20 m are observed. Mapping at such a high resolution is possible, but a lot of repeated measurements are required. After computing a trimmed mean and applying background normalisation, depending on the location 24 to 94 repeated measurement runs (median of 41) are required to map the BC concentrations at a 50 m resolution with an uncertainty of 25 %. When relaxing the uncertainty to 50 %, these numbers reduce to 5 to 11 (median of 8) runs. We conclude that mobile monitoring is a suitable approach for mapping the urban air quality at a high spatial resolution, and can provide insight into the spatial variability that would not be possible with stationary monitors. A careful set-up is needed with a sufficient number of repetitions in relation to the desired reliability and spatial resolution. Specific data processing methods such as background normalisation and event detection have to be applied.

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“…The micro-aethalometer measures the concentration of optically absorbing aerosol particles (equivalent black carbon (EBC, in µg m −3 ) using a mass-specific absorption crosssection (MAC) of 12.47 m 2 g −1 at 880 nm (Petzold et al, 2013)) by the rate of change in light attenuation of a particle spot on a filter through which air is pumped. The inlet flow rate was set at 100 mL min −1 and measurements were made at a temporal resolution of one second.…”

Section: Quality Control and Processing Of The Bc Datamentioning

confidence: 99%

Opportunistic mobile air pollution monitoring: A case study with city wardens in Antwerp

Bossche

Theunis

Elen

et al. 2016

Atmospheric Environment

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The goal of this paper is to explore the potential of opportunistic mobile monitoring to map the exposure to air pollution in the urban environment at a high spatial resolution. Opportunistic mobile monitoring makes use of existing mobile infrastructure or people's common daily routines to move measurement devices around. Opportunistic mobile monitoring can also play a crucial role in participatory monitoring campaigns as a typical way to gather data.A case study to measure black carbon was set up in Antwerp, Belgium, with the collaboration of city employees (city wardens). The Antwerp city wardens are outdoors for a large part of the day on surveillance tours by bicycle or on foot, and gathered a total of 393 hours of measurements. The data collection is unstructured both in space and time, leading to sampling bias. A temporal adjustment can only partly counteract this bias. Although a high spatial coverage was obtained, there is still a rather large uncertainty on the average concentration levels at a spatial resolution of 50 m due to a limited number of measurements and sampling bias. Despite of this uncertainty, large spatial patterns within the city are clearly captured.This study illustrates the potential of campaigns with unstructured opportunistic mobile monitoring, including participatory monitoring campaigns. The results demonstrate that such an approach can indeed be used to identify broad spatial trends over a wider area, enabling applications including hotspot identification, personal exposure studies, regression mapping, etc. But, they also emphasize the need for repeated measurements and careful processing and interpretation of the data.

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Recommendations for reporting "black carbon" measurements

Cited by 953 publications

References 112 publications

Black and brown carbon over central Amazonia: Long-term aerosol measurements at the ATTO site

Black and brown carbon over central Amazonia: Long-term aerosol measurements at the ATTO site

Mobile monitoring for mapping spatial variation in urban air quality: Development and validation of a methodology based on an extensive dataset

Opportunistic mobile air pollution monitoring: A case study with city wardens in Antwerp

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