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...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://hdl.handle.net/11590/468661 https://doi.org/10.5194/cp-14-601-2018 |
id |
ftunivroma3iris:oai:iris.uniroma3.it:11590/468661 |
---|---|
record_format |
openpolar |
spelling |
ftunivroma3iris:oai:iris.uniroma3.it:11590/468661 2024-04-28T08:24:07+00:00 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 Simonsen, Marius Folden Cremonesi, Llorenç Baccolo, Giovanni Bosch, Samuel Delmonte, Barbara Erhardt, Tobia Kjær, Helle Astrid Potenza, Marco Svensson, Ander Vallelonga, Paul 2018 https://hdl.handle.net/11590/468661 https://doi.org/10.5194/cp-14-601-2018 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000431447200002 volume:14 issue:5 firstpage:601 lastpage:608 numberofpages:8 journal:CLIMATE OF THE PAST https://hdl.handle.net/11590/468661 doi:10.5194/cp-14-601-2018 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85046749966 info:eu-repo/semantics/article 2018 ftunivroma3iris https://doi.org/10.5194/cp-14-601-2018 2024-04-02T16:59:54Z 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. Article in Journal/Newspaper ice core Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) Climate of the Past 14 5 601 608 |
institution |
Open Polar |
collection |
Anagrafe della Ricerca d'Ateneo (Universitá degli studi Roma Tre) |
op_collection_id |
ftunivroma3iris |
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. |
author2 |
Simonsen, Marius Folden Cremonesi, Llorenç Baccolo, Giovanni Bosch, Samuel Delmonte, Barbara Erhardt, Tobia Kjær, Helle Astrid Potenza, Marco Svensson, Ander Vallelonga, Paul |
format |
Article in Journal/Newspaper |
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://hdl.handle.net/11590/468661 https://doi.org/10.5194/cp-14-601-2018 |
genre |
ice core |
genre_facet |
ice core |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000431447200002 volume:14 issue:5 firstpage:601 lastpage:608 numberofpages:8 journal:CLIMATE OF THE PAST https://hdl.handle.net/11590/468661 doi:10.5194/cp-14-601-2018 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85046749966 |
op_doi |
https://doi.org/10.5194/cp-14-601-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
5 |
container_start_page |
601 |
op_container_end_page |
608 |
_version_ |
1797584633118851072 |