The high Arctic summer aerosol : Size, chemical composition, morphology and evolution over the pack-ice
Aerosol particles, especially in the high Arctic are still not very well represented in climate models. Particle size and number concentrations are strongly under-predicted and temporal variations of aerosol composition and size are still not very well understood, mainly due to the sparsity of obser...
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Stockholms universitet, Meteorologiska institutionen (MISU)
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ftstockholmuniv:oai:DiVA.org:su-136211 2023-05-15T14:48:43+02:00 The high Arctic summer aerosol : Size, chemical composition, morphology and evolution over the pack-ice Hamacher-Barth, Evelyne 2017 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-136211 eng eng Stockholms universitet, Meteorologiska institutionen (MISU) Stockholm : Department of Meteorology, Stockholm University orcid:0000-0002-0299-5510 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-136211 urn:isbn:978-91-7649-624-4 urn:isbn:978-91-7649-625-1 info:eu-repo/semantics/openAccess Arctic aerosol marine gel electron microscopy EDX-spectroscopy chemical composition morphology size distribution Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2017 ftstockholmuniv 2023-02-23T21:43:34Z Aerosol particles, especially in the high Arctic are still not very well represented in climate models. Particle size and number concentrations are strongly under-predicted and temporal variations of aerosol composition and size are still not very well understood, mainly due to the sparsity of observations. The main objective of this thesis is the characterization of the high Arctic summer aerosol by means of electron microscopy in order to extend the existing data set from previous expeditions by size resolved data on aerosol number, morphology and chemical composition and to gain a better understanding of the evolution of the aerosol in the atmosphere. Ambient aerosol was collected over the pack ice during the Arctic Summer Cloud and Ocean (ASCOS) campaign to the high Arctic in summer 2008. Aerosol particles were evaluated with scanning electron microscopy and subsequent digital image processing to assess particle size and morphology. More than 3900 aerosol particles from 9 sampling events were imaged with scanning electron microscopy and merged into groups of similar morphology which contributed to different degrees to the total aerosol: single particles (82%), gel particles (11%) and halo particles (7%). Single particles were observed over the whole size range with a maximum at 64 nm in diameter, gel particles appeared > 45 nm with a maximum in number at 174 nm, halo particles appeared > 75 nm with a maximum in number at 161 nm. The majority of particles showed the morphology of marine gels, no sea salt or otherwise crystalline particles were observed. Transmission electron microscopy enabled more subtle insights into particle morphology and allowed further subdivision of gel particles into aggregates, aggregates with film and mucus-like particles. Energy dispersive X-ray spectroscopy of individual particles revealed a gradual transition in the content of Na+/K+ and Ca2+/Mg2+ between particle morphologies. Single particles and aggregate particles preferentially contained Na+/K+ whereas aggregate with ... Doctoral or Postdoctoral Thesis Arctic Stockholm University: Publications (DiVA) Arctic |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Arctic aerosol marine gel electron microscopy EDX-spectroscopy chemical composition morphology size distribution Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning |
spellingShingle |
Arctic aerosol marine gel electron microscopy EDX-spectroscopy chemical composition morphology size distribution Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning Hamacher-Barth, Evelyne The high Arctic summer aerosol : Size, chemical composition, morphology and evolution over the pack-ice |
topic_facet |
Arctic aerosol marine gel electron microscopy EDX-spectroscopy chemical composition morphology size distribution Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning |
description |
Aerosol particles, especially in the high Arctic are still not very well represented in climate models. Particle size and number concentrations are strongly under-predicted and temporal variations of aerosol composition and size are still not very well understood, mainly due to the sparsity of observations. The main objective of this thesis is the characterization of the high Arctic summer aerosol by means of electron microscopy in order to extend the existing data set from previous expeditions by size resolved data on aerosol number, morphology and chemical composition and to gain a better understanding of the evolution of the aerosol in the atmosphere. Ambient aerosol was collected over the pack ice during the Arctic Summer Cloud and Ocean (ASCOS) campaign to the high Arctic in summer 2008. Aerosol particles were evaluated with scanning electron microscopy and subsequent digital image processing to assess particle size and morphology. More than 3900 aerosol particles from 9 sampling events were imaged with scanning electron microscopy and merged into groups of similar morphology which contributed to different degrees to the total aerosol: single particles (82%), gel particles (11%) and halo particles (7%). Single particles were observed over the whole size range with a maximum at 64 nm in diameter, gel particles appeared > 45 nm with a maximum in number at 174 nm, halo particles appeared > 75 nm with a maximum in number at 161 nm. The majority of particles showed the morphology of marine gels, no sea salt or otherwise crystalline particles were observed. Transmission electron microscopy enabled more subtle insights into particle morphology and allowed further subdivision of gel particles into aggregates, aggregates with film and mucus-like particles. Energy dispersive X-ray spectroscopy of individual particles revealed a gradual transition in the content of Na+/K+ and Ca2+/Mg2+ between particle morphologies. Single particles and aggregate particles preferentially contained Na+/K+ whereas aggregate with ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Hamacher-Barth, Evelyne |
author_facet |
Hamacher-Barth, Evelyne |
author_sort |
Hamacher-Barth, Evelyne |
title |
The high Arctic summer aerosol : Size, chemical composition, morphology and evolution over the pack-ice |
title_short |
The high Arctic summer aerosol : Size, chemical composition, morphology and evolution over the pack-ice |
title_full |
The high Arctic summer aerosol : Size, chemical composition, morphology and evolution over the pack-ice |
title_fullStr |
The high Arctic summer aerosol : Size, chemical composition, morphology and evolution over the pack-ice |
title_full_unstemmed |
The high Arctic summer aerosol : Size, chemical composition, morphology and evolution over the pack-ice |
title_sort |
high arctic summer aerosol : size, chemical composition, morphology and evolution over the pack-ice |
publisher |
Stockholms universitet, Meteorologiska institutionen (MISU) |
publishDate |
2017 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-136211 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
orcid:0000-0002-0299-5510 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-136211 urn:isbn:978-91-7649-624-4 urn:isbn:978-91-7649-625-1 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766319802352140288 |