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| Titel |
Regional-scale simulations of fungal spore aerosols using an emission parameterization adapted to local measurements of fluorescent biological aerosol particles |
| VerfasserIn |
M. Hummel, C. Hoose, M. Gallagher, D. A. Healy, J. A. Huffman, D. O'Connor, U. Pöschl, C. Pöhlker, N. H. Robinson, M. Schnaiter, J. R. Sodeau, M. Stengel, E. Toprak, H. Vogel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 11 ; Nr. 15, no. 11 (2015-06-04), S.6127-6146 |
| Datensatznummer |
250119789
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| Publikation (Nr.) |
 copernicus.org/acp-15-6127-2015.pdf |
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| Zusammenfassung |
| Fungal spores as a prominent type of primary biological aerosol particles
(PBAP) have been incorporated into the COSMO-ART (Consortium for Small-scale Modelling-Aerosols and Reactive
Trace gases) regional atmospheric model.
Two literature-based emission rates for fungal spores derived from fungal
spore colony counts and chemical tracer measurements were used as a
parameterization baseline for this study. A third, new emission
parameterization for fluorescent biological aerosol particles (FBAP) was
adapted to field measurements from four locations across Europe. FBAP
concentrations can be regarded as a lower estimate of total PBAP
concentrations. Size distributions of FBAP often show a distinct mode at
approx. 3 μm, corresponding to a diameter range characteristic for
many fungal spores. Previous studies for several locations have suggested
that FBAP are in many cases dominated by fungal spores. Thus, we suggest that
simulated FBAP and fungal spore concentrations obtained from the three
different emission parameterizations can be compared to FBAP measurements.
The comparison reveals that simulated fungal spore concentrations based on
literature emission parameterizations are lower than measured FBAP
concentrations. In agreement with the measurements, the model results show a
diurnal cycle in simulated fungal spore concentrations, which may develop
partially as a consequence of a varying boundary layer height between day and
night. Temperature and specific humidity, together with leaf area index (LAI), were
chosen to drive the new emission parameterization which is fitted to the FBAP
observations. The new parameterization results in similar root mean square
errors (RMSEs) and correlation coefficients compared to the FBAP observations as the
previously existing fungal spore emission parameterizations, with some
improvements in the bias. Using the new emission parameterization on a model
domain covering western Europe, FBAP in the lowest model layer comprise a
fraction of 15% of the total aerosol mass over land and reach average
number concentrations of 26 L−1. The results confirm that fungal spores
and biological particles may account for a major fraction of supermicron
aerosol particle number and mass concentration over vegetated continental
regions and should thus be explicitly considered in air quality and climate
studies. |
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