Aerosol particles during the Innsbruck Air Quality Study (INNAQS): The impact of transient fluxes on total aerosol number exchange

Heyden, Lisa von der; Deventer, M. J.; Graus, M.; Karl, T.; Lamprecht, Christian; Held, Andreas

doi:10.1016/j.atmosenv.2018.07.041

Cited by 6 publications

(9 citation statements)

References 62 publications

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“…The median random flux error varies between 27 and 40 % for the different size channels (25 % for FUFP and FTNC) and generally increases towards the boundary size regions of the PNSD. This coincides with random flux errors of between 28 and 39 % as reported by Deventer et al (2018).…”

Section: Quantification Of Measurement Uncertaintysupporting

confidence: 91%

“…Table 1). Total number fluxes of the studies in Stockholm (Mårtensson et al, 2006), Innsbruck (Deventer et al, 2018;Heyden et al, 2018) or Lecce (Conte et al, 2018) are in a similar range.…”

Section: Discussionmentioning

confidence: 68%

“…The strongest emission fluxes occur during daytime with a maximum of smallest particles in the early afternoon (e.g. Schmidt and Klemm, 2008;Deventer et al, 2018). The diurnal courses of particle fluxes coincided with traffic intensity demonstrating strong influence of traffic on FNUC.…”

Section: Discussionmentioning

confidence: 91%

“…Following other urban particle flux studies, we applied linear detrending (e.g. Mårtensson et al, 2006;Vogt et al, 2011a;Deventer et al, 2013;Deventer et al, 2018;Heyden et al, 2018). The particle flux calculation was performed using the software EddyPro® v6.2.2.…”

Section: Data Handlingmentioning

confidence: 99%

“…over non-urban and urban terrain to quantify gaseous pollutant and particle fluxes (e.g. Buzorius et al, 1998;Suni et al, 2003;Damay et al, 2009;Ripamonti et al, 2013;Gioli et al, 2013;Deventer et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Measurement report: Three years of size-resolved eddy-covariance particle number flux measurements in an urban environment

Straaten

Weber

2021

Preprint

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Abstract. Size-resolved particle number fluxes in the size range 10 nm < particle diameter (Dp) < 200 nm were measured over a 3-year period (April 2017–March 2020) using the eddy covariance technique at an urban site in Berlin, Germany. The observations indicated the site as a net source of particles with a median total particle number flux of FTNC = 0.86 × 108 m−2 s−1. The turbulent surface-atmosphere exchange of particles was clearly dominated by ultrafine particles (Dp < 100 nm) with a share of 96 % of total particle number flux (FUFP = 0.83 × 108 m−2 s−1). Annual estimates of median FTNC and FUFP slightly decreased by −9.6 % (−8.9 % for FUFP) from the first to the second observation year and a further −5.9 % (−6.1 % for FUFP) from the second to the third year. The annual variation might be due to different reasons such as variation of flux footprints in the individual years, a slight reduction of traffic intensity in the third year or a progressive transition of the vehicle fleet towards a higher share of low-emission standards or electric drive. Size-resolved measurements illustrated events of bidirectional fluxes, i.e. simultaneous emission and deposition fluxes within the size spectrum, which occurred more often in spring, late summer and autumn than in winter. Multi-year observations of size-resolved particle fluxes proved to be important for deeper understanding of particle exchange processes with the urban surface and the pronounced influence of traffic at this urban site.

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Section: Quantification Of Measurement Uncertaintysupporting

confidence: 91%