Observations of fluorescent aerosol–cloud interactions in the free troposphere at the High-Altitude Research Station Jungfraujoch
The fluorescent nature of aerosol at a high-altitude Alpine site was studied using a wide-band integrated bioaerosol (WIBS-4) single particle multi-channel ultraviolet – light-induced fluorescence (UV-LIF) spectrometer. This was supported by comprehensive cloud microphysics and meteorolo...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-02-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/16/2273/2016/acp-16-2273-2016.pdf |
| _version_ | 1818139227918958592 |
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| author | I. Crawford G. Lloyd G. Lloyd E. Herrmann C. R. Hoyle C. R. Hoyle K. N. Bower P. J. Connolly M. J. Flynn P. H. Kaye T. W. Choularton M. W. Gallagher |
| author_facet | I. Crawford G. Lloyd G. Lloyd E. Herrmann C. R. Hoyle C. R. Hoyle K. N. Bower P. J. Connolly M. J. Flynn P. H. Kaye T. W. Choularton M. W. Gallagher |
| author_sort | I. Crawford |
| collection | DOAJ |
| description | The fluorescent nature of aerosol at a high-altitude Alpine site was studied using a
wide-band integrated bioaerosol (WIBS-4) single particle multi-channel ultraviolet – light-induced fluorescence (UV-LIF) spectrometer. This was supported
by comprehensive cloud microphysics and meteorological measurements with the
aims of cataloguing concentrations of bio-fluorescent aerosols at this high-altitude site and also investigating possible influences of UV–fluorescent
particle types on cloud–aerosol processes.
<br><br>
Analysis of background free tropospheric air masses, using a total aerosol
inlet, showed there to be a minor increase in the fluorescent aerosol
fraction during in-cloud cases compared to out-of-cloud cases. The size
dependence of the fluorescent aerosol fraction showed the larger aerosol to
be more likely to be fluorescent with 80 % of 10 μm particles
being fluorescent. Whilst the fluorescent particles were in the minority
(<i>N</i><sub>Fl</sub>∕<i>N</i><sub>All</sub> = 0.27 ± 0.19), a new hierarchical
agglomerative cluster analysis approach, Crawford et al. (2015) revealed the
majority of the fluorescent aerosols were likely to be representative of
fluorescent mineral dust. A minor episodic contribution from a cluster likely
to be representative of primary biological aerosol particles (PBAP) was also
observed with a wintertime baseline concentration of
0.1 ± 0.4 L<sup>−1</sup>. Given the low concentration of this cluster and
the typically low ice-active fraction of studied PBAP
(e.g. <i>pseudomonas syringae</i>), we suggest that the contribution to the
observed ice crystal concentration at this location is not significant during
the wintertime. |
| first_indexed | 2024-12-11T10:24:45Z |
| format | Article |
| id | doaj.art-73b8bd9885f04d50bf60fb38f3f16abd |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-11T10:24:45Z |
| publishDate | 2016-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-73b8bd9885f04d50bf60fb38f3f16abd2022-12-22T01:11:12ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242016-02-01162273228410.5194/acp-16-2273-2016Observations of fluorescent aerosol–cloud interactions in the free troposphere at the High-Altitude Research Station JungfraujochI. Crawford0G. Lloyd1G. Lloyd2E. Herrmann3C. R. Hoyle4C. R. Hoyle5K. N. Bower6P. J. Connolly7M. J. Flynn8P. H. Kaye9T. W. Choularton10M. W. Gallagher11Centre for Atmospheric Science, SEAES, University of Manchester, Manchester, UKCentre for Atmospheric Science, SEAES, University of Manchester, Manchester, UKNCAS, National Centre for Atmospheric Science, University of Manchester, Manchester, UKLaboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, SwitzerlandLaboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, SwitzerlandWSL Institute for Snow and Avalanche Research SLF, Davos, SwitzerlandCentre for Atmospheric Science, SEAES, University of Manchester, Manchester, UKCentre for Atmospheric Science, SEAES, University of Manchester, Manchester, UKCentre for Atmospheric Science, SEAES, University of Manchester, Manchester, UKScience and Technology Research Institute, University of Hertfordshire, Hatfield, UKCentre for Atmospheric Science, SEAES, University of Manchester, Manchester, UKCentre for Atmospheric Science, SEAES, University of Manchester, Manchester, UKThe fluorescent nature of aerosol at a high-altitude Alpine site was studied using a wide-band integrated bioaerosol (WIBS-4) single particle multi-channel ultraviolet – light-induced fluorescence (UV-LIF) spectrometer. This was supported by comprehensive cloud microphysics and meteorological measurements with the aims of cataloguing concentrations of bio-fluorescent aerosols at this high-altitude site and also investigating possible influences of UV–fluorescent particle types on cloud–aerosol processes. <br><br> Analysis of background free tropospheric air masses, using a total aerosol inlet, showed there to be a minor increase in the fluorescent aerosol fraction during in-cloud cases compared to out-of-cloud cases. The size dependence of the fluorescent aerosol fraction showed the larger aerosol to be more likely to be fluorescent with 80 % of 10 μm particles being fluorescent. Whilst the fluorescent particles were in the minority (<i>N</i><sub>Fl</sub>∕<i>N</i><sub>All</sub> = 0.27 ± 0.19), a new hierarchical agglomerative cluster analysis approach, Crawford et al. (2015) revealed the majority of the fluorescent aerosols were likely to be representative of fluorescent mineral dust. A minor episodic contribution from a cluster likely to be representative of primary biological aerosol particles (PBAP) was also observed with a wintertime baseline concentration of 0.1 ± 0.4 L<sup>−1</sup>. Given the low concentration of this cluster and the typically low ice-active fraction of studied PBAP (e.g. <i>pseudomonas syringae</i>), we suggest that the contribution to the observed ice crystal concentration at this location is not significant during the wintertime.https://www.atmos-chem-phys.net/16/2273/2016/acp-16-2273-2016.pdf |
| spellingShingle | I. Crawford G. Lloyd G. Lloyd E. Herrmann C. R. Hoyle C. R. Hoyle K. N. Bower P. J. Connolly M. J. Flynn P. H. Kaye T. W. Choularton M. W. Gallagher Observations of fluorescent aerosol–cloud interactions in the free troposphere at the High-Altitude Research Station Jungfraujoch Atmospheric Chemistry and Physics |
| title | Observations of fluorescent aerosol–cloud interactions in the free troposphere at the High-Altitude Research Station Jungfraujoch |
| title_full | Observations of fluorescent aerosol–cloud interactions in the free troposphere at the High-Altitude Research Station Jungfraujoch |
| title_fullStr | Observations of fluorescent aerosol–cloud interactions in the free troposphere at the High-Altitude Research Station Jungfraujoch |
| title_full_unstemmed | Observations of fluorescent aerosol–cloud interactions in the free troposphere at the High-Altitude Research Station Jungfraujoch |
| title_short | Observations of fluorescent aerosol–cloud interactions in the free troposphere at the High-Altitude Research Station Jungfraujoch |
| title_sort | observations of fluorescent aerosol ndash cloud interactions in the free troposphere at the high altitude research station jungfraujoch |
| url | https://www.atmos-chem-phys.net/16/2273/2016/acp-16-2273-2016.pdf |
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