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). Particle shape accounts for instrumental discrepancy in ice core dust size distributions. Climate of the past, 14(5), pp. 601-608. Copernicus Publications 10.5194/cp-14-601-2018

[img]
Preview
Text
simonson18clp.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (751kB) | Preview

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 Coul- ter 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Erhardt, Tobias

Subjects:

500 Science > 530 Physics

ISSN:

1814-9324

Publisher:

Copernicus Publications

Language:

English

Submitter:

Doris Rätz

Date Deposited:

24 May 2018 10:41

Last Modified:

28 Oct 2019 04:40

Publisher DOI:

10.5194/cp-14-601-2018

BORIS DOI:

10.7892/boris.116544

URI:

https://boris.unibe.ch/id/eprint/116544

Actions (login required)

Edit item Edit item
Provide Feedback