Heterogeneous ice nucleation of [alpha]-pinene SOA particles before and after ice cloud processing
The ice nucleation ability of [alpha]-pinene secondary organic aerosol (SOA) particles was investigated at temperatures between 253 and 205 K in the Aerosol Interaction and Dynamics in the Atmosphere cloud simulation chamber. Pristine SOA particles were nucleated and grown from pure gas precursors a...
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| Veröffentlicht in: | Journal of geophysical research. Atmospheres 2017-05, Vol.122 (9), p.4924 |
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| creator | Wagner, Robert Hohler, Kristina Huang, Wei Kiselev, Alexei Mohler, Ottmar Mohr, Claudia Pajunoja, Aki Saathoff, Harald Schiebel, Thea Shen, Xiaoli Virtanen, Annele |
| description | The ice nucleation ability of [alpha]-pinene secondary organic aerosol (SOA) particles was investigated at temperatures between 253 and 205 K in the Aerosol Interaction and Dynamics in the Atmosphere cloud simulation chamber. Pristine SOA particles were nucleated and grown from pure gas precursors and then subjected to repeated expansion cooling cycles to compare their intrinsic ice nucleation ability during the first nucleation event with that observed after ice cloud processing. The unprocessed [alpha]-pinene SOA particles were found to be inefficient ice-nucleating particles at cirrus temperatures, with nucleation onsets (for an activated fraction of 0.1%) as high as for the homogeneous freezing of aqueous solution droplets. Ice cloud processing at temperatures below 235 K only marginally improved the particles' ice nucleation ability and did not significantly alter their morphology. In contrast, the particles' morphology and ice nucleation ability was substantially modified upon ice cloud processing in a simulated convective cloud system, where the [alpha]-pinene SOA particles were first activated to supercooled cloud droplets and then froze homogeneously at about 235 K. As evidenced by electron microscopy, the [alpha]-pinene SOA particles adopted a highly porous morphology during such a freeze-drying cycle. When probing the freeze-dried particles in succeeding expansion cooling runs in the mixed-phase cloud regime up to 253 K, the increase in relative humidity led to a collapse of the porous structure. Heterogeneous ice formation was observed after the droplet activation of the collapsed, freeze-dried SOA particles, presumably caused by ice remnants in the highly viscous material or the larger surface area of the particles. Key Points Pristine [alpha]-pinene SOA particles reveal poor heterogeneous ice nucleation ability in the cirrus cloud regime of the upper troposphere Ice cloud processing of [alpha]-pinene SOA particles in a convective cloud system leads to formation of highly porous particles Freeze-dried SOA particles show heterogeneous ice formation in the mixed-phase cloud regime via the CCN-induced ice growth mode |
| doi_str_mv | 10.1002/2016JD026401 |
| format | Article |
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Pristine SOA particles were nucleated and grown from pure gas precursors and then subjected to repeated expansion cooling cycles to compare their intrinsic ice nucleation ability during the first nucleation event with that observed after ice cloud processing. The unprocessed [alpha]-pinene SOA particles were found to be inefficient ice-nucleating particles at cirrus temperatures, with nucleation onsets (for an activated fraction of 0.1%) as high as for the homogeneous freezing of aqueous solution droplets. Ice cloud processing at temperatures below 235 K only marginally improved the particles' ice nucleation ability and did not significantly alter their morphology. In contrast, the particles' morphology and ice nucleation ability was substantially modified upon ice cloud processing in a simulated convective cloud system, where the [alpha]-pinene SOA particles were first activated to supercooled cloud droplets and then froze homogeneously at about 235 K. As evidenced by electron microscopy, the [alpha]-pinene SOA particles adopted a highly porous morphology during such a freeze-drying cycle. When probing the freeze-dried particles in succeeding expansion cooling runs in the mixed-phase cloud regime up to 253 K, the increase in relative humidity led to a collapse of the porous structure. Heterogeneous ice formation was observed after the droplet activation of the collapsed, freeze-dried SOA particles, presumably caused by ice remnants in the highly viscous material or the larger surface area of the particles. Key Points Pristine [alpha]-pinene SOA particles reveal poor heterogeneous ice nucleation ability in the cirrus cloud regime of the upper troposphere Ice cloud processing of [alpha]-pinene SOA particles in a convective cloud system leads to formation of highly porous particles Freeze-dried SOA particles show heterogeneous ice formation in the mixed-phase cloud regime via the CCN-induced ice growth mode</description><identifier>ISSN: 2169-897X</identifier><identifier>EISSN: 2169-8996</identifier><identifier>DOI: 10.1002/2016JD026401</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Aerosol particles ; Aerosol-cloud interactions ; Aerosols ; Alpha rays ; Atmosphere ; Cirrus clouds ; Cloud condensation nuclei ; Cloud droplets ; Cloud systems ; Cloud-climate relationships ; Clouds ; Convective clouds ; Cooling ; Droplets ; Drying ; Dynamics ; Electron microscopy ; Freeze drying ; Freezing ; Geophysics ; Growth ; Ice ; Ice clouds ; Ice formation ; Ice nucleation ; Morphology ; Nucleation ; Organic aerosols in atmosphere ; Particle physics ; Relative humidity ; Secondary aerosols ; Simulation ; Studies ; Temperature ; Troposphere ; Upper troposphere ; α-Pinene</subject><ispartof>Journal of geophysical research. Atmospheres, 2017-05, Vol.122 (9), p.4924</ispartof><rights>2017. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Wagner, Robert</creatorcontrib><creatorcontrib>Hohler, Kristina</creatorcontrib><creatorcontrib>Huang, Wei</creatorcontrib><creatorcontrib>Kiselev, Alexei</creatorcontrib><creatorcontrib>Mohler, Ottmar</creatorcontrib><creatorcontrib>Mohr, Claudia</creatorcontrib><creatorcontrib>Pajunoja, Aki</creatorcontrib><creatorcontrib>Saathoff, Harald</creatorcontrib><creatorcontrib>Schiebel, Thea</creatorcontrib><creatorcontrib>Shen, Xiaoli</creatorcontrib><creatorcontrib>Virtanen, Annele</creatorcontrib><title>Heterogeneous ice nucleation of [alpha]-pinene SOA particles before and after ice cloud processing</title><title>Journal of geophysical research. Atmospheres</title><description>The ice nucleation ability of [alpha]-pinene secondary organic aerosol (SOA) particles was investigated at temperatures between 253 and 205 K in the Aerosol Interaction and Dynamics in the Atmosphere cloud simulation chamber. Pristine SOA particles were nucleated and grown from pure gas precursors and then subjected to repeated expansion cooling cycles to compare their intrinsic ice nucleation ability during the first nucleation event with that observed after ice cloud processing. The unprocessed [alpha]-pinene SOA particles were found to be inefficient ice-nucleating particles at cirrus temperatures, with nucleation onsets (for an activated fraction of 0.1%) as high as for the homogeneous freezing of aqueous solution droplets. Ice cloud processing at temperatures below 235 K only marginally improved the particles' ice nucleation ability and did not significantly alter their morphology. In contrast, the particles' morphology and ice nucleation ability was substantially modified upon ice cloud processing in a simulated convective cloud system, where the [alpha]-pinene SOA particles were first activated to supercooled cloud droplets and then froze homogeneously at about 235 K. As evidenced by electron microscopy, the [alpha]-pinene SOA particles adopted a highly porous morphology during such a freeze-drying cycle. When probing the freeze-dried particles in succeeding expansion cooling runs in the mixed-phase cloud regime up to 253 K, the increase in relative humidity led to a collapse of the porous structure. Heterogeneous ice formation was observed after the droplet activation of the collapsed, freeze-dried SOA particles, presumably caused by ice remnants in the highly viscous material or the larger surface area of the particles. Key Points Pristine [alpha]-pinene SOA particles reveal poor heterogeneous ice nucleation ability in the cirrus cloud regime of the upper troposphere Ice cloud processing of [alpha]-pinene SOA particles in a convective cloud system leads to formation of highly porous particles Freeze-dried SOA particles show heterogeneous ice formation in the mixed-phase cloud regime via the CCN-induced ice growth mode</description><subject>Aerosol particles</subject><subject>Aerosol-cloud interactions</subject><subject>Aerosols</subject><subject>Alpha rays</subject><subject>Atmosphere</subject><subject>Cirrus clouds</subject><subject>Cloud condensation nuclei</subject><subject>Cloud droplets</subject><subject>Cloud systems</subject><subject>Cloud-climate relationships</subject><subject>Clouds</subject><subject>Convective clouds</subject><subject>Cooling</subject><subject>Droplets</subject><subject>Drying</subject><subject>Dynamics</subject><subject>Electron microscopy</subject><subject>Freeze drying</subject><subject>Freezing</subject><subject>Geophysics</subject><subject>Growth</subject><subject>Ice</subject><subject>Ice clouds</subject><subject>Ice formation</subject><subject>Ice nucleation</subject><subject>Morphology</subject><subject>Nucleation</subject><subject>Organic aerosols in atmosphere</subject><subject>Particle physics</subject><subject>Relative humidity</subject><subject>Secondary aerosols</subject><subject>Simulation</subject><subject>Studies</subject><subject>Temperature</subject><subject>Troposphere</subject><subject>Upper troposphere</subject><subject>α-Pinene</subject><issn>2169-897X</issn><issn>2169-8996</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNo9jU1LAzEYhIMoWGpv_oCA59V8b3Is9aNKoYdWEERKkn1TtyzJutn9_wYV5zJzeGYGoWtKbikh7I4Rql7uCVOC0DM0Y1SZShujzv9z_XaJFjmfSJEmXEgxQ24NIwzpCBHSlHHrAcfJd2DHNkWcAn63Xf9pP6q-jYXBu-0S93YY28Jk7CCkAbCNDbah7Pz0fZemBvdD8pBzG49X6CLYLsPiz-fo9fFhv1pXm-3T82q5qXpK-VgFoZi3RkhXk0YFzozgqvYiaEeZlsoJrb0zIHkTLDWEOMWY9lRYL1WoNZ-jm9_dcv01QR4PpzQNsVweCs4oFZIJ_g1G-1cZ</recordid><startdate>20170516</startdate><enddate>20170516</enddate><creator>Wagner, Robert</creator><creator>Hohler, Kristina</creator><creator>Huang, Wei</creator><creator>Kiselev, Alexei</creator><creator>Mohler, Ottmar</creator><creator>Mohr, Claudia</creator><creator>Pajunoja, Aki</creator><creator>Saathoff, Harald</creator><creator>Schiebel, Thea</creator><creator>Shen, Xiaoli</creator><creator>Virtanen, Annele</creator><general>Blackwell Publishing Ltd</general><scope>7TG</scope><scope>7UA</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope></search><sort><creationdate>20170516</creationdate><title>Heterogeneous ice nucleation of [alpha]-pinene SOA particles before and after ice cloud processing</title><author>Wagner, Robert ; Hohler, Kristina ; Huang, Wei ; Kiselev, Alexei ; Mohler, Ottmar ; Mohr, Claudia ; Pajunoja, Aki ; Saathoff, Harald ; Schiebel, Thea ; Shen, Xiaoli ; Virtanen, Annele</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-p113t-f462ca945b70d6f3294367c4f8b12856b488cb9e53dfa1900b6228c14ac56f783</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Aerosol particles</topic><topic>Aerosol-cloud interactions</topic><topic>Aerosols</topic><topic>Alpha rays</topic><topic>Atmosphere</topic><topic>Cirrus clouds</topic><topic>Cloud condensation nuclei</topic><topic>Cloud droplets</topic><topic>Cloud systems</topic><topic>Cloud-climate relationships</topic><topic>Clouds</topic><topic>Convective clouds</topic><topic>Cooling</topic><topic>Droplets</topic><topic>Drying</topic><topic>Dynamics</topic><topic>Electron microscopy</topic><topic>Freeze drying</topic><topic>Freezing</topic><topic>Geophysics</topic><topic>Growth</topic><topic>Ice</topic><topic>Ice clouds</topic><topic>Ice formation</topic><topic>Ice nucleation</topic><topic>Morphology</topic><topic>Nucleation</topic><topic>Organic aerosols in atmosphere</topic><topic>Particle physics</topic><topic>Relative humidity</topic><topic>Secondary aerosols</topic><topic>Simulation</topic><topic>Studies</topic><topic>Temperature</topic><topic>Troposphere</topic><topic>Upper troposphere</topic><topic>α-Pinene</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wagner, Robert</creatorcontrib><creatorcontrib>Hohler, Kristina</creatorcontrib><creatorcontrib>Huang, Wei</creatorcontrib><creatorcontrib>Kiselev, Alexei</creatorcontrib><creatorcontrib>Mohler, Ottmar</creatorcontrib><creatorcontrib>Mohr, Claudia</creatorcontrib><creatorcontrib>Pajunoja, Aki</creatorcontrib><creatorcontrib>Saathoff, Harald</creatorcontrib><creatorcontrib>Schiebel, Thea</creatorcontrib><creatorcontrib>Shen, Xiaoli</creatorcontrib><creatorcontrib>Virtanen, Annele</creatorcontrib><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of geophysical research. Atmospheres</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wagner, Robert</au><au>Hohler, Kristina</au><au>Huang, Wei</au><au>Kiselev, Alexei</au><au>Mohler, Ottmar</au><au>Mohr, Claudia</au><au>Pajunoja, Aki</au><au>Saathoff, Harald</au><au>Schiebel, Thea</au><au>Shen, Xiaoli</au><au>Virtanen, Annele</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Heterogeneous ice nucleation of [alpha]-pinene SOA particles before and after ice cloud processing</atitle><jtitle>Journal of geophysical research. Atmospheres</jtitle><date>2017-05-16</date><risdate>2017</risdate><volume>122</volume><issue>9</issue><spage>4924</spage><pages>4924-</pages><issn>2169-897X</issn><eissn>2169-8996</eissn><abstract>The ice nucleation ability of [alpha]-pinene secondary organic aerosol (SOA) particles was investigated at temperatures between 253 and 205 K in the Aerosol Interaction and Dynamics in the Atmosphere cloud simulation chamber. Pristine SOA particles were nucleated and grown from pure gas precursors and then subjected to repeated expansion cooling cycles to compare their intrinsic ice nucleation ability during the first nucleation event with that observed after ice cloud processing. The unprocessed [alpha]-pinene SOA particles were found to be inefficient ice-nucleating particles at cirrus temperatures, with nucleation onsets (for an activated fraction of 0.1%) as high as for the homogeneous freezing of aqueous solution droplets. Ice cloud processing at temperatures below 235 K only marginally improved the particles' ice nucleation ability and did not significantly alter their morphology. In contrast, the particles' morphology and ice nucleation ability was substantially modified upon ice cloud processing in a simulated convective cloud system, where the [alpha]-pinene SOA particles were first activated to supercooled cloud droplets and then froze homogeneously at about 235 K. As evidenced by electron microscopy, the [alpha]-pinene SOA particles adopted a highly porous morphology during such a freeze-drying cycle. When probing the freeze-dried particles in succeeding expansion cooling runs in the mixed-phase cloud regime up to 253 K, the increase in relative humidity led to a collapse of the porous structure. Heterogeneous ice formation was observed after the droplet activation of the collapsed, freeze-dried SOA particles, presumably caused by ice remnants in the highly viscous material or the larger surface area of the particles. Key Points Pristine [alpha]-pinene SOA particles reveal poor heterogeneous ice nucleation ability in the cirrus cloud regime of the upper troposphere Ice cloud processing of [alpha]-pinene SOA particles in a convective cloud system leads to formation of highly porous particles Freeze-dried SOA particles show heterogeneous ice formation in the mixed-phase cloud regime via the CCN-induced ice growth mode</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2016JD026401</doi></addata></record> |
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| ispartof | Journal of geophysical research. Atmospheres, 2017-05, Vol.122 (9), p.4924 |
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| subjects | Aerosol particles Aerosol-cloud interactions Aerosols Alpha rays Atmosphere Cirrus clouds Cloud condensation nuclei Cloud droplets Cloud systems Cloud-climate relationships Clouds Convective clouds Cooling Droplets Drying Dynamics Electron microscopy Freeze drying Freezing Geophysics Growth Ice Ice clouds Ice formation Ice nucleation Morphology Nucleation Organic aerosols in atmosphere Particle physics Relative humidity Secondary aerosols Simulation Studies Temperature Troposphere Upper troposphere α-Pinene |
| title | Heterogeneous ice nucleation of [alpha]-pinene SOA particles before and after ice cloud processing |
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