Single particle analysis of ice crystal residuals observed in orographic wave clouds over Scandinavia during INTACC experiment
Individual ice crystal residual particles collected over Scandinavia during the INTACC (INTeraction of Aerosol and Cold Clouds) experiment in October 1999 were analyzed by Scanning Electron Microscopy (SEM) equipped with Energy-Dispersive X-ray Analysis (EDX). Samples were collected onboard the Brit...
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ftdoajarticles:oai:doaj.org/article:a94ea874da314a6f86f663eded7b50e8 2023-05-15T15:16:30+02:00 Single particle analysis of ice crystal residuals observed in orographic wave clouds over Scandinavia during INTACC experiment A. C. Targino R. Krejci K. J. Noone P. Glantz 2006-01-01T00:00:00Z https://doaj.org/article/a94ea874da314a6f86f663eded7b50e8 EN eng Copernicus Publications http://www.atmos-chem-phys.net/6/1977/2006/acp-6-1977-2006.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/a94ea874da314a6f86f663eded7b50e8 Atmospheric Chemistry and Physics, Vol 6, Iss 7, Pp 1977-1990 (2006) Physics QC1-999 Chemistry QD1-999 article 2006 ftdoajarticles 2022-12-31T00:50:56Z Individual ice crystal residual particles collected over Scandinavia during the INTACC (INTeraction of Aerosol and Cold Clouds) experiment in October 1999 were analyzed by Scanning Electron Microscopy (SEM) equipped with Energy-Dispersive X-ray Analysis (EDX). Samples were collected onboard the British Met Office Hercules C-130 aircraft using a Counterflow Virtual Impactor (CVI). This study is based on six samples collected in orographic clouds. The main aim of this study is to characterize cloud residual elemental composition in conditions affected by different airmasses. In total 609 particles larger than 0.1 μm diameter were analyzed and their elemental composition and morphology were determined. Thereafter a hierarchical cluster analysis was performed on the signal detected with SEM-EDX in order to identify the major particle classes and their abundance. A cluster containing mineral dust, represented by aluminosilicates, Fe-rich and Si-rich particles, was the dominating class of particles, accounting for about 57.5% of the particles analyzed, followed by low-Z particles, 23.3% (presumably organic material) and sea salt (6.7%). Sulfur was detected often across all groups, indicating ageing and in-cloud processing of particles. A detailed inspection of samples individually unveiled a relationship between ice crystal residual composition and airmass origin. Cloud residual samples from clean airmasses (that is, trajectories confined to the Atlantic and Arctic Oceans and/or with source altitude in the free troposphere) were dominated primarily by low-Z and sea salt particles, while continentally-influenced airmasses (with trajectories that originated or traveled over continental areas and with source altitude in the continental boundary layer) contained mainly mineral dust residuals. Comparison of residual composition for similar cloud ambient temperatures around –27°C revealed that supercooled clouds are more likely to persist in conditions where low-Z particles represent significant part of the analyzed cloud ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Hercules ENVELOPE(161.450,161.450,-77.483,-77.483) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 A. C. Targino R. Krejci K. J. Noone P. Glantz Single particle analysis of ice crystal residuals observed in orographic wave clouds over Scandinavia during INTACC experiment |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Individual ice crystal residual particles collected over Scandinavia during the INTACC (INTeraction of Aerosol and Cold Clouds) experiment in October 1999 were analyzed by Scanning Electron Microscopy (SEM) equipped with Energy-Dispersive X-ray Analysis (EDX). Samples were collected onboard the British Met Office Hercules C-130 aircraft using a Counterflow Virtual Impactor (CVI). This study is based on six samples collected in orographic clouds. The main aim of this study is to characterize cloud residual elemental composition in conditions affected by different airmasses. In total 609 particles larger than 0.1 μm diameter were analyzed and their elemental composition and morphology were determined. Thereafter a hierarchical cluster analysis was performed on the signal detected with SEM-EDX in order to identify the major particle classes and their abundance. A cluster containing mineral dust, represented by aluminosilicates, Fe-rich and Si-rich particles, was the dominating class of particles, accounting for about 57.5% of the particles analyzed, followed by low-Z particles, 23.3% (presumably organic material) and sea salt (6.7%). Sulfur was detected often across all groups, indicating ageing and in-cloud processing of particles. A detailed inspection of samples individually unveiled a relationship between ice crystal residual composition and airmass origin. Cloud residual samples from clean airmasses (that is, trajectories confined to the Atlantic and Arctic Oceans and/or with source altitude in the free troposphere) were dominated primarily by low-Z and sea salt particles, while continentally-influenced airmasses (with trajectories that originated or traveled over continental areas and with source altitude in the continental boundary layer) contained mainly mineral dust residuals. Comparison of residual composition for similar cloud ambient temperatures around –27°C revealed that supercooled clouds are more likely to persist in conditions where low-Z particles represent significant part of the analyzed cloud ... |
format |
Article in Journal/Newspaper |
author |
A. C. Targino R. Krejci K. J. Noone P. Glantz |
author_facet |
A. C. Targino R. Krejci K. J. Noone P. Glantz |
author_sort |
A. C. Targino |
title |
Single particle analysis of ice crystal residuals observed in orographic wave clouds over Scandinavia during INTACC experiment |
title_short |
Single particle analysis of ice crystal residuals observed in orographic wave clouds over Scandinavia during INTACC experiment |
title_full |
Single particle analysis of ice crystal residuals observed in orographic wave clouds over Scandinavia during INTACC experiment |
title_fullStr |
Single particle analysis of ice crystal residuals observed in orographic wave clouds over Scandinavia during INTACC experiment |
title_full_unstemmed |
Single particle analysis of ice crystal residuals observed in orographic wave clouds over Scandinavia during INTACC experiment |
title_sort |
single particle analysis of ice crystal residuals observed in orographic wave clouds over scandinavia during intacc experiment |
publisher |
Copernicus Publications |
publishDate |
2006 |
url |
https://doaj.org/article/a94ea874da314a6f86f663eded7b50e8 |
long_lat |
ENVELOPE(161.450,161.450,-77.483,-77.483) |
geographic |
Arctic Hercules |
geographic_facet |
Arctic Hercules |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 6, Iss 7, Pp 1977-1990 (2006) |
op_relation |
http://www.atmos-chem-phys.net/6/1977/2006/acp-6-1977-2006.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/a94ea874da314a6f86f663eded7b50e8 |
_version_ |
1766346799194308608 |