Cloud condensation nuclei activation properties of Mediterranean pollen types considering organic chemical composition and surface tension effects

被引：8

作者：

Casans, A. ^{[1
,2
]}

Rejano, F. ^{[1
,2
]}

Maldonado-Valderrama, J. ^{[2
,3
]}

Casquero-Vera, J. A. ^{[1
,4
,5
]}

Ruiz-Penuela, S. ^{[1
,2
]}

van Drooge, B. L. ^{[5
]}

Lyamani, H. ^{[1
,6
]}

Cazorla, A. ^{[1
,2
]}

Andrews, E. ^{[7
,8
]}

Lin, Jack J. ^{[9
]}

Mirza-Montoro, F. ^{[10
]}

Perez-Ramirez, D. ^{[1
,2
]}

Olmo, F. J. ^{[1
,2
]}

Alados-Arboledas, L. ^{[1
,2
]}

Carinanos, P. ^{[1
,11
]}

Titos, G. ^{[1
,2
]}

机构：

[1] Univ Granada, Andalusian Inst Earth Syst Res IISTA, Granada 18006, Spain

[2] Univ Granada, Dept Appl Phys, Granada 18071, Spain

[3] Univ Granada, Unidad Excelencia Int Modeling Nat MNat, Granada, Spain

[4] Univ Helsinki, Inst Atmospher & Earth Syst Res INAR Phys, Fac Sci, Helsinki, Finland

[5] CSIC, Inst Environm Assessment & Water Res IDAEA, Barcelona 08034, Spain

[6] Univ Malaga, Dept Appl Phys, Malaga 29010, Spain

[7] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

[8] NOAA, Global Monitoring Lab, Boulder, CO 80305 USA

[9] Univ Oulu, Ctr Atmospher Res, POB 4500, Oulu 90014, Finland

[10] Univ Warsaw, Inst Geophys, Fac Phys, PL-00927 Warsaw, Poland

[11] Univ Granada, Dept Bot, Granada 18071, Spain

来源：

ATMOSPHERIC ENVIRONMENT | 2023年 / 310卷

基金：

欧盟地平线“2020”;

关键词：

Aerosol; Pollen; Cloud condensation nuclei; Hygroscopicity; Surface tension; SINGLE-PARAMETER REPRESENTATION; DROP SHAPE-ANALYSIS; AEROSOL-PARTICLES; PART; HYGROSCOPIC GROWTH; WATER-UPTAKE; SUBPOLLEN PARTICLES; MOLECULAR-WEIGHT; CCN ACTIVATION; RAIN-FOREST;

D O I：

10.1016/j.atmosenv.2023.119961

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Wind-dispersed pollen grains emitted from vegetation are directly injected into the atmosphere being an important source of natural aerosols globally. These coarse particles of pollen can rupture into smaller particles, known as subpollen particles (SPPs), that may act as cloud condensation nuclei (CCN) and affect the climate. In this study, we characterize and investigate the ability of SPPs of 10 Mediterranean-climate pollen types to activate as CCN. A continuous flow CCN counter (CCNC) was used to measure the activation of size-selected (80, 100 and 200 nm dry mobility diameter) particles at different supersaturations (SS). Hygroscopicity parameter (x) for each SPP type and size has been calculated using x-Ko & BULL;hler theory. Organic chemical speciation and protein content has been determined to further characterize pollen solutions. Furthermore, the surface activity of SPPs has also been investigated by using pendant drop tensiometry. All studied SPP samples show critical supersaturation (SSCrit) values that are atmospherically relevant SS conditions. Hygroscopicity x values are in the range characteristic of organic compounds (0.1-0.3). We found that organic speciation and protein content vary substantially among pollen types, with saccharides and fatty acids being the only organic compounds found in all pollen types. A clear relationship between SPP activation and its organic composition was not observed. This study also reveals that all SPPs investigated reduce the surface tension of water at high concentrations but at diluted concentrations (such as those of activation in the CCNC), the water surface tension value is a good

引用

页数：15

共 110 条

[11] Isolation of subpollen particles (SPPs) of birch: SPPs are potential carriers of ice nucleating macromolecules [J].