Cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals

This study reports laboratory measurements of particle size distributions, cloud condensation nuclei (CCN) activity, and droplet activation kinetics of wet generated aerosols from clays, calcite, quartz, and desert soil samples from Northern Africa, East Asia/China, and Northern America. The dependence of critical supersaturation, sc, on particle dry diameter, Ddry, is used to characterize particle-water interactions and assess the ability of Frenkel-Halsey-Hill adsorption activation theory (FHH-AT) and Köhler theory (KT) to describe the CCN activity of the considered samples. Wet generated regional dust samples produce unimodal size distributions with particle sizes as small as 40 nm, CCN activation consistent with KT, and exhibit hygroscopicity similar to inorganic salts. Wet generated clays and minerals produce a bimodal size distribution; the CCN activity of the smaller mode is consistent with KT, while the larger mode is less hydrophilic, follows activation by FHH-AT, and displays almost identical CCN activity to dry generated dust. Ion Chromatography (IC) analysis performed on regional dust samples indicates a soluble fraction that cannot explain the CCN activity of dry or wet generated dust. A mass balance and hygroscopicity closure suggests that the small amount of ions (from low solubility compounds like calcite) present in the dry dust dissolve in the aqueous suspension during the wet generation process and give rise to the observed small hygroscopic mode. Overall these results identify an artifact that may question the atmospheric relevance of dust CCN activity studies using the wet generation method. Based on the method of threshold droplet growth analysis, wet generated mineral aerosols display similar activation kinetics compared to ammonium sulfate calibration aerosol. Finally, a unified CCN activity framework that accounts for concurrent effects of solute and adsorption is developed to describe the CCN activity of aged or hygroscopic dusts. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	P. Kumar [verfasserIn] I. N. Sokolik [verfasserIn] A. Nenes [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2011

Übergeordnetes Werk:	In: Atmospheric Chemistry and Physics - Copernicus Publications, 2003, 11(2011), 16, Seite 8661-8676
Übergeordnetes Werk:	volume:11 ; year:2011 ; number:16 ; pages:8661-8676

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc Journal toc

DOI / URN:	10.5194/acp-11-8661-2011

Katalog-ID:	DOAJ044641435

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spelling	10.5194/acp-11-8661-2011 doi (DE-627)DOAJ044641435 (DE-599)DOAJ5d2c11a10b5f47de8a45f05a6f883d00 DE-627 ger DE-627 rakwb eng QC1-999 QD1-999 P. Kumar verfasserin aut Cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This study reports laboratory measurements of particle size distributions, cloud condensation nuclei (CCN) activity, and droplet activation kinetics of wet generated aerosols from clays, calcite, quartz, and desert soil samples from Northern Africa, East Asia/China, and Northern America. The dependence of critical supersaturation, <i>s</i><sub>c</sub>, on particle dry diameter, <i>D</i><sub>dry</sub>, is used to characterize particle-water interactions and assess the ability of Frenkel-Halsey-Hill adsorption activation theory (FHH-AT) and Köhler theory (KT) to describe the CCN activity of the considered samples. Wet generated regional dust samples produce unimodal size distributions with particle sizes as small as 40 nm, CCN activation consistent with KT, and exhibit hygroscopicity similar to inorganic salts. Wet generated clays and minerals produce a bimodal size distribution; the CCN activity of the smaller mode is consistent with KT, while the larger mode is less hydrophilic, follows activation by FHH-AT, and displays almost identical CCN activity to dry generated dust. Ion Chromatography (IC) analysis performed on regional dust samples indicates a soluble fraction that cannot explain the CCN activity of dry or wet generated dust. A mass balance and hygroscopicity closure suggests that the small amount of ions (from low solubility compounds like calcite) present in the dry dust dissolve in the aqueous suspension during the wet generation process and give rise to the observed small hygroscopic mode. Overall these results identify an artifact that may question the atmospheric relevance of dust CCN activity studies using the wet generation method. <br><br> Based on the method of threshold droplet growth analysis, wet generated mineral aerosols display similar activation kinetics compared to ammonium sulfate calibration aerosol. Finally, a unified CCN activity framework that accounts for concurrent effects of solute and adsorption is developed to describe the CCN activity of aged or hygroscopic dusts. Physics Chemistry I. N. Sokolik verfasserin aut A. Nenes verfasserin aut In Atmospheric Chemistry and Physics Copernicus Publications, 2003 11(2011), 16, Seite 8661-8676 (DE-627)092499996 16807324 nnns volume:11 year:2011 number:16 pages:8661-8676 https://doi.org/10.5194/acp-11-8661-2011 kostenfrei https://doaj.org/article/5d2c11a10b5f47de8a45f05a6f883d00 kostenfrei http://www.atmos-chem-phys.net/11/8661/2011/acp-11-8661-2011.pdf kostenfrei https://doaj.org/toc/1680-7316 Journal toc kostenfrei https://doaj.org/toc/1680-7324 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_381 AR 11 2011 16 8661-8676
allfields_unstemmed	10.5194/acp-11-8661-2011 doi (DE-627)DOAJ044641435 (DE-599)DOAJ5d2c11a10b5f47de8a45f05a6f883d00 DE-627 ger DE-627 rakwb eng QC1-999 QD1-999 P. Kumar verfasserin aut Cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This study reports laboratory measurements of particle size distributions, cloud condensation nuclei (CCN) activity, and droplet activation kinetics of wet generated aerosols from clays, calcite, quartz, and desert soil samples from Northern Africa, East Asia/China, and Northern America. The dependence of critical supersaturation, <i>s</i><sub>c</sub>, on particle dry diameter, <i>D</i><sub>dry</sub>, is used to characterize particle-water interactions and assess the ability of Frenkel-Halsey-Hill adsorption activation theory (FHH-AT) and Köhler theory (KT) to describe the CCN activity of the considered samples. Wet generated regional dust samples produce unimodal size distributions with particle sizes as small as 40 nm, CCN activation consistent with KT, and exhibit hygroscopicity similar to inorganic salts. Wet generated clays and minerals produce a bimodal size distribution; the CCN activity of the smaller mode is consistent with KT, while the larger mode is less hydrophilic, follows activation by FHH-AT, and displays almost identical CCN activity to dry generated dust. Ion Chromatography (IC) analysis performed on regional dust samples indicates a soluble fraction that cannot explain the CCN activity of dry or wet generated dust. A mass balance and hygroscopicity closure suggests that the small amount of ions (from low solubility compounds like calcite) present in the dry dust dissolve in the aqueous suspension during the wet generation process and give rise to the observed small hygroscopic mode. Overall these results identify an artifact that may question the atmospheric relevance of dust CCN activity studies using the wet generation method. <br><br> Based on the method of threshold droplet growth analysis, wet generated mineral aerosols display similar activation kinetics compared to ammonium sulfate calibration aerosol. Finally, a unified CCN activity framework that accounts for concurrent effects of solute and adsorption is developed to describe the CCN activity of aged or hygroscopic dusts. Physics Chemistry I. N. Sokolik verfasserin aut A. Nenes verfasserin aut In Atmospheric Chemistry and Physics Copernicus Publications, 2003 11(2011), 16, Seite 8661-8676 (DE-627)092499996 16807324 nnns volume:11 year:2011 number:16 pages:8661-8676 https://doi.org/10.5194/acp-11-8661-2011 kostenfrei https://doaj.org/article/5d2c11a10b5f47de8a45f05a6f883d00 kostenfrei http://www.atmos-chem-phys.net/11/8661/2011/acp-11-8661-2011.pdf kostenfrei https://doaj.org/toc/1680-7316 Journal toc kostenfrei https://doaj.org/toc/1680-7324 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_381 AR 11 2011 16 8661-8676
allfieldsGer	10.5194/acp-11-8661-2011 doi (DE-627)DOAJ044641435 (DE-599)DOAJ5d2c11a10b5f47de8a45f05a6f883d00 DE-627 ger DE-627 rakwb eng QC1-999 QD1-999 P. Kumar verfasserin aut Cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This study reports laboratory measurements of particle size distributions, cloud condensation nuclei (CCN) activity, and droplet activation kinetics of wet generated aerosols from clays, calcite, quartz, and desert soil samples from Northern Africa, East Asia/China, and Northern America. The dependence of critical supersaturation, <i>s</i><sub>c</sub>, on particle dry diameter, <i>D</i><sub>dry</sub>, is used to characterize particle-water interactions and assess the ability of Frenkel-Halsey-Hill adsorption activation theory (FHH-AT) and Köhler theory (KT) to describe the CCN activity of the considered samples. Wet generated regional dust samples produce unimodal size distributions with particle sizes as small as 40 nm, CCN activation consistent with KT, and exhibit hygroscopicity similar to inorganic salts. Wet generated clays and minerals produce a bimodal size distribution; the CCN activity of the smaller mode is consistent with KT, while the larger mode is less hydrophilic, follows activation by FHH-AT, and displays almost identical CCN activity to dry generated dust. Ion Chromatography (IC) analysis performed on regional dust samples indicates a soluble fraction that cannot explain the CCN activity of dry or wet generated dust. A mass balance and hygroscopicity closure suggests that the small amount of ions (from low solubility compounds like calcite) present in the dry dust dissolve in the aqueous suspension during the wet generation process and give rise to the observed small hygroscopic mode. Overall these results identify an artifact that may question the atmospheric relevance of dust CCN activity studies using the wet generation method. <br><br> Based on the method of threshold droplet growth analysis, wet generated mineral aerosols display similar activation kinetics compared to ammonium sulfate calibration aerosol. Finally, a unified CCN activity framework that accounts for concurrent effects of solute and adsorption is developed to describe the CCN activity of aged or hygroscopic dusts. Physics Chemistry I. N. Sokolik verfasserin aut A. Nenes verfasserin aut In Atmospheric Chemistry and Physics Copernicus Publications, 2003 11(2011), 16, Seite 8661-8676 (DE-627)092499996 16807324 nnns volume:11 year:2011 number:16 pages:8661-8676 https://doi.org/10.5194/acp-11-8661-2011 kostenfrei https://doaj.org/article/5d2c11a10b5f47de8a45f05a6f883d00 kostenfrei http://www.atmos-chem-phys.net/11/8661/2011/acp-11-8661-2011.pdf kostenfrei https://doaj.org/toc/1680-7316 Journal toc kostenfrei https://doaj.org/toc/1680-7324 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_381 AR 11 2011 16 8661-8676
allfieldsSound	10.5194/acp-11-8661-2011 doi (DE-627)DOAJ044641435 (DE-599)DOAJ5d2c11a10b5f47de8a45f05a6f883d00 DE-627 ger DE-627 rakwb eng QC1-999 QD1-999 P. Kumar verfasserin aut Cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This study reports laboratory measurements of particle size distributions, cloud condensation nuclei (CCN) activity, and droplet activation kinetics of wet generated aerosols from clays, calcite, quartz, and desert soil samples from Northern Africa, East Asia/China, and Northern America. The dependence of critical supersaturation, <i>s</i><sub>c</sub>, on particle dry diameter, <i>D</i><sub>dry</sub>, is used to characterize particle-water interactions and assess the ability of Frenkel-Halsey-Hill adsorption activation theory (FHH-AT) and Köhler theory (KT) to describe the CCN activity of the considered samples. Wet generated regional dust samples produce unimodal size distributions with particle sizes as small as 40 nm, CCN activation consistent with KT, and exhibit hygroscopicity similar to inorganic salts. Wet generated clays and minerals produce a bimodal size distribution; the CCN activity of the smaller mode is consistent with KT, while the larger mode is less hydrophilic, follows activation by FHH-AT, and displays almost identical CCN activity to dry generated dust. Ion Chromatography (IC) analysis performed on regional dust samples indicates a soluble fraction that cannot explain the CCN activity of dry or wet generated dust. A mass balance and hygroscopicity closure suggests that the small amount of ions (from low solubility compounds like calcite) present in the dry dust dissolve in the aqueous suspension during the wet generation process and give rise to the observed small hygroscopic mode. Overall these results identify an artifact that may question the atmospheric relevance of dust CCN activity studies using the wet generation method. <br><br> Based on the method of threshold droplet growth analysis, wet generated mineral aerosols display similar activation kinetics compared to ammonium sulfate calibration aerosol. Finally, a unified CCN activity framework that accounts for concurrent effects of solute and adsorption is developed to describe the CCN activity of aged or hygroscopic dusts. Physics Chemistry I. N. Sokolik verfasserin aut A. Nenes verfasserin aut In Atmospheric Chemistry and Physics Copernicus Publications, 2003 11(2011), 16, Seite 8661-8676 (DE-627)092499996 16807324 nnns volume:11 year:2011 number:16 pages:8661-8676 https://doi.org/10.5194/acp-11-8661-2011 kostenfrei https://doaj.org/article/5d2c11a10b5f47de8a45f05a6f883d00 kostenfrei http://www.atmos-chem-phys.net/11/8661/2011/acp-11-8661-2011.pdf kostenfrei https://doaj.org/toc/1680-7316 Journal toc kostenfrei https://doaj.org/toc/1680-7324 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_381 AR 11 2011 16 8661-8676
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author	P. Kumar
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topic_title	QC1-999 QD1-999 Cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals
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title	Cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals
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title_sort	cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals
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title_auth	Cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals
abstract	This study reports laboratory measurements of particle size distributions, cloud condensation nuclei (CCN) activity, and droplet activation kinetics of wet generated aerosols from clays, calcite, quartz, and desert soil samples from Northern Africa, East Asia/China, and Northern America. The dependence of critical supersaturation, <i>s</i><sub>c</sub>, on particle dry diameter, <i>D</i><sub>dry</sub>, is used to characterize particle-water interactions and assess the ability of Frenkel-Halsey-Hill adsorption activation theory (FHH-AT) and Köhler theory (KT) to describe the CCN activity of the considered samples. Wet generated regional dust samples produce unimodal size distributions with particle sizes as small as 40 nm, CCN activation consistent with KT, and exhibit hygroscopicity similar to inorganic salts. Wet generated clays and minerals produce a bimodal size distribution; the CCN activity of the smaller mode is consistent with KT, while the larger mode is less hydrophilic, follows activation by FHH-AT, and displays almost identical CCN activity to dry generated dust. Ion Chromatography (IC) analysis performed on regional dust samples indicates a soluble fraction that cannot explain the CCN activity of dry or wet generated dust. A mass balance and hygroscopicity closure suggests that the small amount of ions (from low solubility compounds like calcite) present in the dry dust dissolve in the aqueous suspension during the wet generation process and give rise to the observed small hygroscopic mode. Overall these results identify an artifact that may question the atmospheric relevance of dust CCN activity studies using the wet generation method. <br><br> Based on the method of threshold droplet growth analysis, wet generated mineral aerosols display similar activation kinetics compared to ammonium sulfate calibration aerosol. Finally, a unified CCN activity framework that accounts for concurrent effects of solute and adsorption is developed to describe the CCN activity of aged or hygroscopic dusts.
abstractGer	This study reports laboratory measurements of particle size distributions, cloud condensation nuclei (CCN) activity, and droplet activation kinetics of wet generated aerosols from clays, calcite, quartz, and desert soil samples from Northern Africa, East Asia/China, and Northern America. The dependence of critical supersaturation, <i>s</i><sub>c</sub>, on particle dry diameter, <i>D</i><sub>dry</sub>, is used to characterize particle-water interactions and assess the ability of Frenkel-Halsey-Hill adsorption activation theory (FHH-AT) and Köhler theory (KT) to describe the CCN activity of the considered samples. Wet generated regional dust samples produce unimodal size distributions with particle sizes as small as 40 nm, CCN activation consistent with KT, and exhibit hygroscopicity similar to inorganic salts. Wet generated clays and minerals produce a bimodal size distribution; the CCN activity of the smaller mode is consistent with KT, while the larger mode is less hydrophilic, follows activation by FHH-AT, and displays almost identical CCN activity to dry generated dust. Ion Chromatography (IC) analysis performed on regional dust samples indicates a soluble fraction that cannot explain the CCN activity of dry or wet generated dust. A mass balance and hygroscopicity closure suggests that the small amount of ions (from low solubility compounds like calcite) present in the dry dust dissolve in the aqueous suspension during the wet generation process and give rise to the observed small hygroscopic mode. Overall these results identify an artifact that may question the atmospheric relevance of dust CCN activity studies using the wet generation method. <br><br> Based on the method of threshold droplet growth analysis, wet generated mineral aerosols display similar activation kinetics compared to ammonium sulfate calibration aerosol. Finally, a unified CCN activity framework that accounts for concurrent effects of solute and adsorption is developed to describe the CCN activity of aged or hygroscopic dusts.
abstract_unstemmed	This study reports laboratory measurements of particle size distributions, cloud condensation nuclei (CCN) activity, and droplet activation kinetics of wet generated aerosols from clays, calcite, quartz, and desert soil samples from Northern Africa, East Asia/China, and Northern America. The dependence of critical supersaturation, <i>s</i><sub>c</sub>, on particle dry diameter, <i>D</i><sub>dry</sub>, is used to characterize particle-water interactions and assess the ability of Frenkel-Halsey-Hill adsorption activation theory (FHH-AT) and Köhler theory (KT) to describe the CCN activity of the considered samples. Wet generated regional dust samples produce unimodal size distributions with particle sizes as small as 40 nm, CCN activation consistent with KT, and exhibit hygroscopicity similar to inorganic salts. Wet generated clays and minerals produce a bimodal size distribution; the CCN activity of the smaller mode is consistent with KT, while the larger mode is less hydrophilic, follows activation by FHH-AT, and displays almost identical CCN activity to dry generated dust. Ion Chromatography (IC) analysis performed on regional dust samples indicates a soluble fraction that cannot explain the CCN activity of dry or wet generated dust. A mass balance and hygroscopicity closure suggests that the small amount of ions (from low solubility compounds like calcite) present in the dry dust dissolve in the aqueous suspension during the wet generation process and give rise to the observed small hygroscopic mode. Overall these results identify an artifact that may question the atmospheric relevance of dust CCN activity studies using the wet generation method. <br><br> Based on the method of threshold droplet growth analysis, wet generated mineral aerosols display similar activation kinetics compared to ammonium sulfate calibration aerosol. Finally, a unified CCN activity framework that accounts for concurrent effects of solute and adsorption is developed to describe the CCN activity of aged or hygroscopic dusts.
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title_short	Cloud condensation nuclei activity and droplet activation kinetics of wet processed regional dust samples and minerals
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