Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front
We present preliminary results of shipboard measurements using the Queensland University of Technology Neutral Cluster and Air Ion Spectrometer (NAIS) carried on-board the research vessel Investigator on the Southern Ocean in February 2015. The NAIS detects both charged and neutral particles below 4...
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ftqueensland:oai:eprints.qut.edu.au:98544 2023-07-30T03:57:56+02:00 Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front Jayaratne, Rohan Cravigan, Luke Alroe, Joel Ristovski, Zoran 2016-08-05 application/pdf https://eprints.qut.edu.au/98544/ unknown https://eprints.qut.edu.au/98544/1/Jayaratne_ANZAA2016_Investigator.pdf Jayaratne, Rohan, Cravigan, Luke, Alroe, Joel, & Ristovski, Zoran (2016) Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front. In Australia and New Zealand Aerosol Assembly, 2016-08-04 - 2016-08-05. (Unpublished) https://eprints.qut.edu.au/98544/ Institute of Health and Biomedical Innovation; Science & Engineering Faculty free_to_read Copyright 2016 [please consult the authors] This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au Australia and New Zealand Aerosol Assembly Aerosols Air Pollution Charged Particles Ions Contribution to conference 2016 ftqueensland 2023-07-10T22:21:23Z We present preliminary results of shipboard measurements using the Queensland University of Technology Neutral Cluster and Air Ion Spectrometer (NAIS) carried on-board the research vessel Investigator on the Southern Ocean in February 2015. The NAIS detects both charged and neutral particles below 42 nm in diameter. During its voyage from Hobart to the Antarctic ice edge, the Investigator made two passes across the southern polar front - southbound on 6/7 Feb and northbound on 9/10 Feb. During each of the two passes, we observed significant increases in particle number concentration as the vessel entered the polar front. The particle data was ‘cleaned’ by removing the data at those times when the sampled air was affected by emissions from the ship’s exhaust, as identified by the corresponding black carbon data and obvious sharp spikes in concentration. After excluding such data, we determined that the number concentrations of the larger particle in the size range 7.5 to 42 nm outside and inside the frontal region were 618 ± 92 cm-3 and 1006 ± 348 cm-3, respectively. This difference was statistically significant at a confidence level of 99%. The particle size distribution was bimodal with peaks around 3 nm and 25 nm. A large fraction of the number of particles, approximately 50% of the total number in the NAIS range, was smaller than 5 nm both inside and outside the frontal band. We do not see this mode in land-based measurements. While accepting that it is unlikely to be a consequence of sea salt owing to the small particle sizes, we have no viable explanation for this observation at present. Conference Object Antarc* Antarctic Southern Ocean Queensland University of Technology: QUT ePrints Antarctic Queensland Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Queensland University of Technology: QUT ePrints |
op_collection_id |
ftqueensland |
language |
unknown |
topic |
Aerosols Air Pollution Charged Particles Ions |
spellingShingle |
Aerosols Air Pollution Charged Particles Ions Jayaratne, Rohan Cravigan, Luke Alroe, Joel Ristovski, Zoran Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front |
topic_facet |
Aerosols Air Pollution Charged Particles Ions |
description |
We present preliminary results of shipboard measurements using the Queensland University of Technology Neutral Cluster and Air Ion Spectrometer (NAIS) carried on-board the research vessel Investigator on the Southern Ocean in February 2015. The NAIS detects both charged and neutral particles below 42 nm in diameter. During its voyage from Hobart to the Antarctic ice edge, the Investigator made two passes across the southern polar front - southbound on 6/7 Feb and northbound on 9/10 Feb. During each of the two passes, we observed significant increases in particle number concentration as the vessel entered the polar front. The particle data was ‘cleaned’ by removing the data at those times when the sampled air was affected by emissions from the ship’s exhaust, as identified by the corresponding black carbon data and obvious sharp spikes in concentration. After excluding such data, we determined that the number concentrations of the larger particle in the size range 7.5 to 42 nm outside and inside the frontal region were 618 ± 92 cm-3 and 1006 ± 348 cm-3, respectively. This difference was statistically significant at a confidence level of 99%. The particle size distribution was bimodal with peaks around 3 nm and 25 nm. A large fraction of the number of particles, approximately 50% of the total number in the NAIS range, was smaller than 5 nm both inside and outside the frontal band. We do not see this mode in land-based measurements. While accepting that it is unlikely to be a consequence of sea salt owing to the small particle sizes, we have no viable explanation for this observation at present. |
format |
Conference Object |
author |
Jayaratne, Rohan Cravigan, Luke Alroe, Joel Ristovski, Zoran |
author_facet |
Jayaratne, Rohan Cravigan, Luke Alroe, Joel Ristovski, Zoran |
author_sort |
Jayaratne, Rohan |
title |
Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front |
title_short |
Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front |
title_full |
Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front |
title_fullStr |
Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front |
title_full_unstemmed |
Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front |
title_sort |
neutral cluster and air ion spectrometer (nais) measurements during the passage across the southern polar front |
publishDate |
2016 |
url |
https://eprints.qut.edu.au/98544/ |
geographic |
Antarctic Queensland Southern Ocean The Antarctic |
geographic_facet |
Antarctic Queensland Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Australia and New Zealand Aerosol Assembly |
op_relation |
https://eprints.qut.edu.au/98544/1/Jayaratne_ANZAA2016_Investigator.pdf Jayaratne, Rohan, Cravigan, Luke, Alroe, Joel, & Ristovski, Zoran (2016) Neutral Cluster and Air Ion Spectrometer (NAIS) measurements during the passage across the southern polar front. In Australia and New Zealand Aerosol Assembly, 2016-08-04 - 2016-08-05. (Unpublished) https://eprints.qut.edu.au/98544/ Institute of Health and Biomedical Innovation; Science & Engineering Faculty |
op_rights |
free_to_read Copyright 2016 [please consult the authors] This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
_version_ |
1772820354039808000 |