Inverse Relationship of Marine Aerosol and Dust in Antarctic Ice with Fine-Grained Sediment in the South Atlantic Ocean: Implications for Sea-Ice Coverage and Wind Strength
This research seeks to test the hypothesis that natural gamma radiation (NGR) from Ocean Drilling Program Site 1094, which displays variability over the last glacial-interglacial cycle similar to dust in the Vostok ice core, reflects fine-grained terrigenous sediment delivered by eolian processes. G...
Published in: | The International Journal of Ocean and Climate Systems |
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Online Access: | http://dx.doi.org/10.1260/1759-3131.3.1.1 http://journals.sagepub.com/doi/pdf/10.1260/1759-3131.3.1.1 |
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crsagepubl:10.1260/1759-3131.3.1.1 2023-05-15T14:11:08+02:00 Inverse Relationship of Marine Aerosol and Dust in Antarctic Ice with Fine-Grained Sediment in the South Atlantic Ocean: Implications for Sea-Ice Coverage and Wind Strength Kanfoush, Sharon L. 2012 http://dx.doi.org/10.1260/1759-3131.3.1.1 http://journals.sagepub.com/doi/pdf/10.1260/1759-3131.3.1.1 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The International Journal of Ocean and Climate Systems volume 3, issue 1, page 1-15 ISSN 1759-3131 1759-314X journal-article 2012 crsagepubl https://doi.org/10.1260/1759-3131.3.1.1 2022-04-14T04:47:25Z This research seeks to test the hypothesis that natural gamma radiation (NGR) from Ocean Drilling Program Site 1094, which displays variability over the last glacial-interglacial cycle similar to dust in the Vostok ice core, reflects fine-grained terrigenous sediment delivered by eolian processes. Grain size was measured on 400 samples spanning 0–20 m in a composite core. Accumulation of the <63μ size fraction at Site 1094 and dust in Vostok exhibit a negative correlation, suggesting the fine sediments are not dominantly eolian. However the technique used for grain size measurements cannot distinguish between terrigenous and biogenous materials; therefore it is possible much fine-grained material is diatoms. An inverse correlation between fine sediments and NGR supports this interpretation, and implies terrigenous materials were at times diluted by microfossils from high biological productivity. Fine marine sediments correlate positively with temperature and negatively with marine aerosol Na+ in Vostok. One plausible explanation is extensive sea-ice of cold intervals steepened ocean-continent temperature gradients, intensified winds, and led to increased transport of dust and marine aerosol to Antarctica yet also reduced biological productivity at Site 1094. Such a reduction despite increases in NGR, potentially representing Fe-rich dust influx, would require light limitation or stratification associated with sea-ice. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Sea ice South Atlantic Ocean SAGE Publications (via Crossref) Antarctic The International Journal of Ocean and Climate Systems 3 1 1 15 |
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Open Polar |
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SAGE Publications (via Crossref) |
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crsagepubl |
language |
English |
description |
This research seeks to test the hypothesis that natural gamma radiation (NGR) from Ocean Drilling Program Site 1094, which displays variability over the last glacial-interglacial cycle similar to dust in the Vostok ice core, reflects fine-grained terrigenous sediment delivered by eolian processes. Grain size was measured on 400 samples spanning 0–20 m in a composite core. Accumulation of the <63μ size fraction at Site 1094 and dust in Vostok exhibit a negative correlation, suggesting the fine sediments are not dominantly eolian. However the technique used for grain size measurements cannot distinguish between terrigenous and biogenous materials; therefore it is possible much fine-grained material is diatoms. An inverse correlation between fine sediments and NGR supports this interpretation, and implies terrigenous materials were at times diluted by microfossils from high biological productivity. Fine marine sediments correlate positively with temperature and negatively with marine aerosol Na+ in Vostok. One plausible explanation is extensive sea-ice of cold intervals steepened ocean-continent temperature gradients, intensified winds, and led to increased transport of dust and marine aerosol to Antarctica yet also reduced biological productivity at Site 1094. Such a reduction despite increases in NGR, potentially representing Fe-rich dust influx, would require light limitation or stratification associated with sea-ice. |
format |
Article in Journal/Newspaper |
author |
Kanfoush, Sharon L. |
spellingShingle |
Kanfoush, Sharon L. Inverse Relationship of Marine Aerosol and Dust in Antarctic Ice with Fine-Grained Sediment in the South Atlantic Ocean: Implications for Sea-Ice Coverage and Wind Strength |
author_facet |
Kanfoush, Sharon L. |
author_sort |
Kanfoush, Sharon L. |
title |
Inverse Relationship of Marine Aerosol and Dust in Antarctic Ice with Fine-Grained Sediment in the South Atlantic Ocean: Implications for Sea-Ice Coverage and Wind Strength |
title_short |
Inverse Relationship of Marine Aerosol and Dust in Antarctic Ice with Fine-Grained Sediment in the South Atlantic Ocean: Implications for Sea-Ice Coverage and Wind Strength |
title_full |
Inverse Relationship of Marine Aerosol and Dust in Antarctic Ice with Fine-Grained Sediment in the South Atlantic Ocean: Implications for Sea-Ice Coverage and Wind Strength |
title_fullStr |
Inverse Relationship of Marine Aerosol and Dust in Antarctic Ice with Fine-Grained Sediment in the South Atlantic Ocean: Implications for Sea-Ice Coverage and Wind Strength |
title_full_unstemmed |
Inverse Relationship of Marine Aerosol and Dust in Antarctic Ice with Fine-Grained Sediment in the South Atlantic Ocean: Implications for Sea-Ice Coverage and Wind Strength |
title_sort |
inverse relationship of marine aerosol and dust in antarctic ice with fine-grained sediment in the south atlantic ocean: implications for sea-ice coverage and wind strength |
publisher |
SAGE Publications |
publishDate |
2012 |
url |
http://dx.doi.org/10.1260/1759-3131.3.1.1 http://journals.sagepub.com/doi/pdf/10.1260/1759-3131.3.1.1 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica ice core Sea ice South Atlantic Ocean |
genre_facet |
Antarc* Antarctic Antarctica ice core Sea ice South Atlantic Ocean |
op_source |
The International Journal of Ocean and Climate Systems volume 3, issue 1, page 1-15 ISSN 1759-3131 1759-314X |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1260/1759-3131.3.1.1 |
container_title |
The International Journal of Ocean and Climate Systems |
container_volume |
3 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
15 |
_version_ |
1766283263299551232 |