Particle shape accounts for instrumental discrepancy in ice core dust size distributions
The Klotz Abakus laser sensor and the Coulter counter are both used for measuring the size distribution of insoluble mineral dust particles in ice cores. While the Coulter counter measures particle volume accurately, the equivalent Abakus instrument measurement deviates substantially from the Coulte...
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ftcopernicus:oai:publications.copernicus.org:cp63336 2023-05-15T16:38:46+02:00 Particle shape accounts for instrumental discrepancy in ice core dust size distributions Simonsen, Marius Folden Cremonesi, Llorenç Baccolo, Giovanni Bosch, Samuel Delmonte, Barbara Erhardt, Tobias Kjær, Helle Astrid Potenza, Marco Svensson, Anders Vallelonga, Paul 2018-09-27 application/pdf https://doi.org/10.5194/cp-14-601-2018 https://cp.copernicus.org/articles/14/601/2018/ eng eng doi:10.5194/cp-14-601-2018 https://cp.copernicus.org/articles/14/601/2018/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cp-14-601-2018 2020-07-20T16:23:19Z The Klotz Abakus laser sensor and the Coulter counter are both used for measuring the size distribution of insoluble mineral dust particles in ice cores. While the Coulter counter measures particle volume accurately, the equivalent Abakus instrument measurement deviates substantially from the Coulter counter. We show that the difference between the Abakus and the Coulter counter measurements is mainly caused by the irregular shape of dust particles in ice core samples. The irregular shape means that a new calibration routine based on standard spheres is necessary for obtaining fully comparable data. This new calibration routine gives an increased accuracy to Abakus measurements, which may improve future ice core record intercomparisons. We derived an analytical model for extracting the aspect ratio of dust particles from the difference between Abakus and Coulter counter data. For verification, we measured the aspect ratio of the same samples directly using a single-particle extinction and scattering instrument. The results demonstrate that the model is accurate enough to discern between samples of aspect ratio 0.3 and 0.4 using only the comparison of Abakus and Coulter counter data. Text ice core Copernicus Publications: E-Journals Coulter ENVELOPE(-58.033,-58.033,-83.283,-83.283) Climate of the Past 14 5 601 608 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The Klotz Abakus laser sensor and the Coulter counter are both used for measuring the size distribution of insoluble mineral dust particles in ice cores. While the Coulter counter measures particle volume accurately, the equivalent Abakus instrument measurement deviates substantially from the Coulter counter. We show that the difference between the Abakus and the Coulter counter measurements is mainly caused by the irregular shape of dust particles in ice core samples. The irregular shape means that a new calibration routine based on standard spheres is necessary for obtaining fully comparable data. This new calibration routine gives an increased accuracy to Abakus measurements, which may improve future ice core record intercomparisons. We derived an analytical model for extracting the aspect ratio of dust particles from the difference between Abakus and Coulter counter data. For verification, we measured the aspect ratio of the same samples directly using a single-particle extinction and scattering instrument. The results demonstrate that the model is accurate enough to discern between samples of aspect ratio 0.3 and 0.4 using only the comparison of Abakus and Coulter counter data. |
format |
Text |
author |
Simonsen, Marius Folden Cremonesi, Llorenç Baccolo, Giovanni Bosch, Samuel Delmonte, Barbara Erhardt, Tobias Kjær, Helle Astrid Potenza, Marco Svensson, Anders Vallelonga, Paul |
spellingShingle |
Simonsen, Marius Folden Cremonesi, Llorenç Baccolo, Giovanni Bosch, Samuel Delmonte, Barbara Erhardt, Tobias Kjær, Helle Astrid Potenza, Marco Svensson, Anders Vallelonga, Paul Particle shape accounts for instrumental discrepancy in ice core dust size distributions |
author_facet |
Simonsen, Marius Folden Cremonesi, Llorenç Baccolo, Giovanni Bosch, Samuel Delmonte, Barbara Erhardt, Tobias Kjær, Helle Astrid Potenza, Marco Svensson, Anders Vallelonga, Paul |
author_sort |
Simonsen, Marius Folden |
title |
Particle shape accounts for instrumental discrepancy in ice core dust size distributions |
title_short |
Particle shape accounts for instrumental discrepancy in ice core dust size distributions |
title_full |
Particle shape accounts for instrumental discrepancy in ice core dust size distributions |
title_fullStr |
Particle shape accounts for instrumental discrepancy in ice core dust size distributions |
title_full_unstemmed |
Particle shape accounts for instrumental discrepancy in ice core dust size distributions |
title_sort |
particle shape accounts for instrumental discrepancy in ice core dust size distributions |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-14-601-2018 https://cp.copernicus.org/articles/14/601/2018/ |
long_lat |
ENVELOPE(-58.033,-58.033,-83.283,-83.283) |
geographic |
Coulter |
geographic_facet |
Coulter |
genre |
ice core |
genre_facet |
ice core |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-14-601-2018 https://cp.copernicus.org/articles/14/601/2018/ |
op_doi |
https://doi.org/10.5194/cp-14-601-2018 |
container_title |
Climate of the Past |
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14 |
container_issue |
5 |
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601 |
op_container_end_page |
608 |
_version_ |
1766029100211765248 |