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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fttriple:oai:gotriple.eu:_ClSZBiGwfMMUtjijBQ4U 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 https://doi.org/10.5194/cp-14-601-2018 https://cp.copernicus.org/articles/14/601/2018/ en eng doi:10.5194/cp-14-601-2018 10670/1.zfxkr0 https://cp.copernicus.org/articles/14/601/2018/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2018 fttriple https://doi.org/10.5194/cp-14-601-2018 2023-01-22T17:51:54Z 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 Unknown Coulter ENVELOPE(-58.033,-58.033,-83.283,-83.283) Climate of the Past 14 5 601 608 |
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geo envir 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 |
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geo envir |
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 |
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 |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-14-601-2018 10670/1.zfxkr0 https://cp.copernicus.org/articles/14/601/2018/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-14-601-2018 |
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Climate of the Past |
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14 |
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5 |
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601 |
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608 |
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1766029098971299840 |