Observations of fluorescent aerosol-cloud interactions in the free troposphere at the High-Altitude Research Station Jungfraujoch
Observations of fluorescent aerosol-cloud interactions in the free troposphere at the High-Altitude Research Station Jungfraujoch
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DOI：
10.5194/acp-16-2273-2016
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发表时间：
2016-01-01
影响因子：
6.3
通讯作者：
Gallagher, M. W.
中科院分区：
文献类型：
--
作者：
Crawford, I.;Lloyd, G.;Gallagher, M. W.
利用宽带集成生物气溶胶（WIBS-4）单粒子多通道紫外诱导荧光（UV-LIF）光谱仪研究了高海拔地区气溶胶的荧光性质。这得到了全面的云微物理学和气象测量的支持，其目的是对这一高海拔地点的生物荧光气溶胶浓度进行编目，并调查紫外荧光粒子类型对云-气溶胶过程的可能影响。显示有一个轻微的增加，在荧光气溶胶分数在云的情况下相比，云外的情况下。荧光气溶胶部分的大小依赖性显示较大的气溶胶更可能是荧光与80%的10 μ m的颗粒是荧光。虽然荧光颗粒占少数（N-Fl / N-All = 0.27 +/- 0.19），但Crawford等人（2015）采用的一种新的分层凝聚聚类分析方法显示，大多数荧光气溶胶可能代表荧光矿物粉尘。还观察到一个可能代表初级生物气溶胶颗粒（PBAP）的簇的小插曲贡献，冬季基线浓度为0.1 +/- 0.4 L-1。考虑到这个集群的低浓度和典型的低冰活性部分的研究PBAP（例如pseudocarpingae），我们建议，在这个位置观察到的冰晶浓度的贡献是不显着的，在冬季。
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 highaltitude site and also investigating possible influences of UVfluorescent particle types on cloud-aerosol processes.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 mu m particles being fluorescent. Whilst the fluorescent particles were in the minority (N-Fl / N-All = 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-1. Given the low concentration of this cluster and the typically low ice-active fraction of studied PBAP (e.g. pseudomonas syringae), we suggest that the contribution to the observed ice crystal concentration at this location is not significant during the wintertime.