Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period
A novel laser microparticle detector used in conjunction with continuous sample melting has provided a more than 1500 m long record of particle concentration and size distribution of the NGRIP ice core, covering continuously the period approximately from 9.5–100 kyr before present; measurements were...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | https://boris.unibe.ch/158294/1/ruth03jgr.pdf https://boris.unibe.ch/158294/ |
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ftunivbern:oai:boris.unibe.ch:158294 2023-08-20T04:06:57+02:00 Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period Ruth, Urs Wagenbach, Dietmar Steffensen, Jørgen P. Bigler, Matthias 2003 application/pdf https://boris.unibe.ch/158294/1/ruth03jgr.pdf https://boris.unibe.ch/158294/ eng eng American Geophysical Union https://boris.unibe.ch/158294/ info:eu-repo/semantics/openAccess Ruth, Urs; Wagenbach, Dietmar; Steffensen, Jørgen P.; Bigler, Matthias (2003). Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period. Journal of Geophysical Research: Atmospheres, 108(D3), pp. 1-12. American Geophysical Union 10.1029/2002JD002376 <http://dx.doi.org/10.1029/2002JD002376> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2003 ftunivbern https://doi.org/10.1029/2002JD002376 2023-07-31T22:08:01Z A novel laser microparticle detector used in conjunction with continuous sample melting has provided a more than 1500 m long record of particle concentration and size distribution of the NGRIP ice core, covering continuously the period approximately from 9.5–100 kyr before present; measurements were at 1.65 m depth resolution, corresponding to approximately 35–200 yr. Particle concentration increased by a factor of 100 in the Last Glacial Maximum (LGM) compared to the Preboreal, and sharp variations of concentration occurred synchronously with rapid changes in the δ18O temperature proxy. The lognormal mode μ of the volume distribution shows clear systematic variations with smaller modes during warmer climates and coarser modes during colder periods. We find μ ≈ 1.7 μm diameter during LGM and μ ≈ 1.3 μm during the Preboreal. On timescales below several 100 years μ and the particle concentration exhibit a certain degree of independence present especially during warm periods, when μ generally is more variable. Using highly simplifying considerations for atmospheric transport and deposition of particles we infer that (1) the observed changes of μ in the ice largely reflect changes in the size of airborne particles above the ice sheet and (2) changes of μ are indicative of changes in long range atmospheric transport time. From the observed size changes we estimate shorter transit times by roughly 25% during LGM compared to the Preboreal. The associated particle concentration increase from more efficient long range transport is estimated to less than one order of magnitude. Article in Journal/Newspaper Greenland ice core Ice Sheet NGRIP BORIS (Bern Open Repository and Information System, University of Bern) Greenland Journal of Geophysical Research: Atmospheres 108 D3 n/a n/a |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Ruth, Urs Wagenbach, Dietmar Steffensen, Jørgen P. Bigler, Matthias Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period |
topic_facet |
530 Physics |
description |
A novel laser microparticle detector used in conjunction with continuous sample melting has provided a more than 1500 m long record of particle concentration and size distribution of the NGRIP ice core, covering continuously the period approximately from 9.5–100 kyr before present; measurements were at 1.65 m depth resolution, corresponding to approximately 35–200 yr. Particle concentration increased by a factor of 100 in the Last Glacial Maximum (LGM) compared to the Preboreal, and sharp variations of concentration occurred synchronously with rapid changes in the δ18O temperature proxy. The lognormal mode μ of the volume distribution shows clear systematic variations with smaller modes during warmer climates and coarser modes during colder periods. We find μ ≈ 1.7 μm diameter during LGM and μ ≈ 1.3 μm during the Preboreal. On timescales below several 100 years μ and the particle concentration exhibit a certain degree of independence present especially during warm periods, when μ generally is more variable. Using highly simplifying considerations for atmospheric transport and deposition of particles we infer that (1) the observed changes of μ in the ice largely reflect changes in the size of airborne particles above the ice sheet and (2) changes of μ are indicative of changes in long range atmospheric transport time. From the observed size changes we estimate shorter transit times by roughly 25% during LGM compared to the Preboreal. The associated particle concentration increase from more efficient long range transport is estimated to less than one order of magnitude. |
format |
Article in Journal/Newspaper |
author |
Ruth, Urs Wagenbach, Dietmar Steffensen, Jørgen P. Bigler, Matthias |
author_facet |
Ruth, Urs Wagenbach, Dietmar Steffensen, Jørgen P. Bigler, Matthias |
author_sort |
Ruth, Urs |
title |
Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period |
title_short |
Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period |
title_full |
Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period |
title_fullStr |
Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period |
title_full_unstemmed |
Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period |
title_sort |
continuous record of microparticle concentration and size distribution in the central greenland ngrip ice core during the last glacial period |
publisher |
American Geophysical Union |
publishDate |
2003 |
url |
https://boris.unibe.ch/158294/1/ruth03jgr.pdf https://boris.unibe.ch/158294/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet NGRIP |
genre_facet |
Greenland ice core Ice Sheet NGRIP |
op_source |
Ruth, Urs; Wagenbach, Dietmar; Steffensen, Jørgen P.; Bigler, Matthias (2003). Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period. Journal of Geophysical Research: Atmospheres, 108(D3), pp. 1-12. American Geophysical Union 10.1029/2002JD002376 <http://dx.doi.org/10.1029/2002JD002376> |
op_relation |
https://boris.unibe.ch/158294/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2002JD002376 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
108 |
container_issue |
D3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1774718331913240576 |