Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr
Knowledge on past variability of sedimentary organic carbon in the Arctic Ocean is important to assess natural carbon cycling and transport processes related to global climate changes. However, the late Pleistocene oceanographic history of the Arctic is still poorly understood. In the present study...
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ftdoajarticles:oai:doaj.org/article:9df4fd42635346f296e4cd50a4f16ba4 2023-05-15T14:48:41+02:00 Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr S. F. Rella M. Uchida 2011-12-01T00:00:00Z https://doi.org/10.5194/bg-8-3545-2011 https://doaj.org/article/9df4fd42635346f296e4cd50a4f16ba4 EN eng Copernicus Publications http://www.biogeosciences.net/8/3545/2011/bg-8-3545-2011.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-8-3545-2011 1726-4170 1726-4189 https://doaj.org/article/9df4fd42635346f296e4cd50a4f16ba4 Biogeosciences, Vol 8, Iss 12, Pp 3545-3553 (2011) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2011 ftdoajarticles https://doi.org/10.5194/bg-8-3545-2011 2023-01-08T01:34:08Z Knowledge on past variability of sedimentary organic carbon in the Arctic Ocean is important to assess natural carbon cycling and transport processes related to global climate changes. However, the late Pleistocene oceanographic history of the Arctic is still poorly understood. In the present study we show sedimentary records of total organic carbon (TOC), CaCO 3 , benthic foraminiferal δ 18 O and the coarse grain size fraction from a piston core recovered from the northern Northwind Ridge in the far western Arctic Ocean, a region potentially sensitively responding to past variability in surface current regimes and sedimentary processes such as coastal erosion. An age model based on oxygen stratigraphy, radiocarbon dating and lithological constraints suggests that the piston core records paleoenvironmental changes of the last 155 kyr. TOC shows orbital-scale increases and decreases that can be respectively correlated to the waxing and waning of large ice sheets dominating the Eurasian Arctic, suggesting advection of fine suspended matter derived from glacial erosion to the Northwind Ridge by eastward flowing intermediate water and/or surface water and sea ice during cold episodes of the last two glacial-interglacial cycles. At millennial scales, increases in TOC might correlate to a suite of Dansgaard-Oeschger Stadials between 120 and 45 ka before present (BP) indicating a possible response to abrupt northern hemispheric temperature changes. Between 70 and 45 ka BP, closures and openings of the Bering Strait could have additionally influenced TOC variability. CaCO 3 content tends to anti-correlate with TOC on both orbital and millennial time scales, which we interpret in terms of enhanced sediment advection from the carbonate-rich Canadian Arctic via an extended Beaufort Gyre during warm periods of the last two glacial-interglacial cycles and increased organic carbon advection from the Siberian Arctic during cold periods when the Beaufort Gyre contracted. We propose that this pattern may be related to orbital- ... Article in Journal/Newspaper Arctic Arctic Ocean Bering Strait Chukchi Foraminifera* Ice Sheet Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Bering Strait Chukchi Borderland ENVELOPE(-165.000,-165.000,77.000,77.000) Biogeosciences 8 12 3545 3553 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 S. F. Rella M. Uchida Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Knowledge on past variability of sedimentary organic carbon in the Arctic Ocean is important to assess natural carbon cycling and transport processes related to global climate changes. However, the late Pleistocene oceanographic history of the Arctic is still poorly understood. In the present study we show sedimentary records of total organic carbon (TOC), CaCO 3 , benthic foraminiferal δ 18 O and the coarse grain size fraction from a piston core recovered from the northern Northwind Ridge in the far western Arctic Ocean, a region potentially sensitively responding to past variability in surface current regimes and sedimentary processes such as coastal erosion. An age model based on oxygen stratigraphy, radiocarbon dating and lithological constraints suggests that the piston core records paleoenvironmental changes of the last 155 kyr. TOC shows orbital-scale increases and decreases that can be respectively correlated to the waxing and waning of large ice sheets dominating the Eurasian Arctic, suggesting advection of fine suspended matter derived from glacial erosion to the Northwind Ridge by eastward flowing intermediate water and/or surface water and sea ice during cold episodes of the last two glacial-interglacial cycles. At millennial scales, increases in TOC might correlate to a suite of Dansgaard-Oeschger Stadials between 120 and 45 ka before present (BP) indicating a possible response to abrupt northern hemispheric temperature changes. Between 70 and 45 ka BP, closures and openings of the Bering Strait could have additionally influenced TOC variability. CaCO 3 content tends to anti-correlate with TOC on both orbital and millennial time scales, which we interpret in terms of enhanced sediment advection from the carbonate-rich Canadian Arctic via an extended Beaufort Gyre during warm periods of the last two glacial-interglacial cycles and increased organic carbon advection from the Siberian Arctic during cold periods when the Beaufort Gyre contracted. We propose that this pattern may be related to orbital- ... |
format |
Article in Journal/Newspaper |
author |
S. F. Rella M. Uchida |
author_facet |
S. F. Rella M. Uchida |
author_sort |
S. F. Rella |
title |
Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr |
title_short |
Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr |
title_full |
Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr |
title_fullStr |
Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr |
title_full_unstemmed |
Sedimentary organic matter and carbonate variations in the Chukchi Borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr |
title_sort |
sedimentary organic matter and carbonate variations in the chukchi borderland in association with ice sheet and ocean-atmosphere dynamics over the last 155 kyr |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/bg-8-3545-2011 https://doaj.org/article/9df4fd42635346f296e4cd50a4f16ba4 |
long_lat |
ENVELOPE(-165.000,-165.000,77.000,77.000) |
geographic |
Arctic Arctic Ocean Bering Strait Chukchi Borderland |
geographic_facet |
Arctic Arctic Ocean Bering Strait Chukchi Borderland |
genre |
Arctic Arctic Ocean Bering Strait Chukchi Foraminifera* Ice Sheet Sea ice |
genre_facet |
Arctic Arctic Ocean Bering Strait Chukchi Foraminifera* Ice Sheet Sea ice |
op_source |
Biogeosciences, Vol 8, Iss 12, Pp 3545-3553 (2011) |
op_relation |
http://www.biogeosciences.net/8/3545/2011/bg-8-3545-2011.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-8-3545-2011 1726-4170 1726-4189 https://doaj.org/article/9df4fd42635346f296e4cd50a4f16ba4 |
op_doi |
https://doi.org/10.5194/bg-8-3545-2011 |
container_title |
Biogeosciences |
container_volume |
8 |
container_issue |
12 |
container_start_page |
3545 |
op_container_end_page |
3553 |
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1766319773189144576 |