Articles | Volume 19, issue 2
https://doi.org/10.5194/cp-19-477-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-19-477-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
| 
21 Feb 2023
Research article | Highlight paper |
| 21 Feb 2023
| 21 Feb 2023
Non-spherical microparticle shape in Antarctica during the last glacial period affects dust volume-related metrics
Aaron Chesler
CORRESPONDING AUTHOR
Climate Change Institute, University of Maine, Orono, Maine 04469, USA
School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469, USA
now at: Environmental Studies Department, Goucher College, Towson, Maryland 21204, USA
Dominic Winski
Climate Change Institute, University of Maine, Orono, Maine 04469, USA
School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469, USA
Karl Kreutz
Climate Change Institute, University of Maine, Orono, Maine 04469, USA
School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469, USA
Bess Koffman
Department of Geology, Colby College, Waterville, Maine 04901, USA
Erich Osterberg
Department of Earth Science, Dartmouth College, Hanover, New Hampshire 03755, USA
David Ferris
Department of Earth Science, Dartmouth College, Hanover, New Hampshire 03755, USA
Zayta Thundercloud
Department of Earth Science, Dartmouth College, Hanover, New Hampshire 03755, USA
Joseph Mohan
Climate Change Institute, University of Maine, Orono, Maine 04469, USA
Ecology and Environmental Sciences Program, University of Maine, Orono, Maine 04469, USA
School of Biology and Ecology, University of Maine, Orono, Maine 04469, USA
Jihong Cole-Dai
Department of Chemistry and Biochemistry, South Dakota State University, Brookings, South Dakota 57007, USA
Mark Wells
School of Marine Sciences, University of Maine, Orono, Maine 04469, USA
Michael Handley
Climate Change Institute, University of Maine, Orono, Maine 04469, USA
Aaron Putnam
Climate Change Institute, University of Maine, Orono, Maine 04469, USA
School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469, USA
Katherine Anderson
Department of Earth Science, Dartmouth College, Hanover, New Hampshire 03755, USA
Natalie Harmon
School of Earth and Climate Sciences, University of Maine, Orono, Maine 04469, USA
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Co-editor-in-chief
Knowledge of microparticle geometry is essential for accurate calculation of ice core volume-related dust metrics (mass, flux, and particle size distributions) and subsequent paleoclimate interpretations, yet particle shape data remain sparse in most of ice core records. The approach and results of this work are of interest for the broad geoscience community, since it potentially enables a better characterization of all data obtained from the dust in ice cores. This study of samples from South Pole ice core (SPC14) indicates that coarser particles (>5.0 μm diameter) show greater variation in measured aspect ratios than finer particles (<5.0 μm). While fine particle volumes can be accurately estimated using the spherical assumption, applying the same assumption to coarse particles has a large effect on inferred particle volumes.
Knowledge of microparticle geometry is essential for accurate calculation of ice core...
Short summary
Ice core microparticle data typically use geometry assumptions to calculate particle mass and flux. We use dynamic particle imaging, a novel technique for ice core dust analyses, combined with traditional laser particle counting and Coulter counter techniques to assess particle shape in the South Pole Ice Core (SPC14) spanning 50–16 ka. Our results suggest that particles are dominantly ellipsoidal in shape and that spherical assumptions overestimate particle mass and flux.
Ice core microparticle data typically use geometry assumptions to calculate particle mass and...
