The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years
Two piston cores, one located far from the continents (The North Pacific Ocean: ES core), and another located comparatively closer to the continents (The Bering Sea: BOW-8a core) were investigated to reconstruct environmental changes on source land areas. The results show significant contribution of...
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Online Access: | http://hdl.handle.net/2115/13695 https://doi.org/10.1016/j.chemgeo.2005.10.005 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/13695 2023-05-15T15:43:03+02:00 The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years Ratnayake, Nalin Prasanna Suzuki, Noriyuki Okada, Makoto Takagi, Miyuki http://hdl.handle.net/2115/13695 https://doi.org/10.1016/j.chemgeo.2005.10.005 eng eng Elsevier http://www.sciencedirect.com/science/journal/00092541 http://hdl.handle.net/2115/13695 Chemical geology, 228(4): 197-208 http://dx.doi.org/10.1016/j.chemgeo.2005.10.005 Bering Sea Pacific Ocean n-alkanes stable carbon isotope deep-sea sediments higher plants average chain length 452 article (author version) fthokunivhus https://doi.org/10.1016/j.chemgeo.2005.10.005 2022-11-18T01:01:17Z Two piston cores, one located far from the continents (The North Pacific Ocean: ES core), and another located comparatively closer to the continents (The Bering Sea: BOW-8a core) were investigated to reconstruct environmental changes on source land areas. The results show significant contribution of terrestrial organic matter to sediments in both cores. The δ13C values of n-C27, n-C29, and n-C31 alkanes in sediments from the North Pacific ES core show significant glacial to interglacial variation whereas those from the Bering Sea core do not. Variations of δ13C values of land plant n-alkanes are related to the environmental or vegetational changes in the source land areas. Environmental changes, especially, aridity, rainfall, and pCO2 during glacial/interglacial transitional periods can affect vegetation, and therefore C3 / C4 plant ratios, resulting in δ13C changes in the preserved land plant biomarkers. Maximum values of δ13C as well as maximum average chain length values of long chain n-alkanes in the ES core occur mostly at the interglacial to glacial transition zones reflecting a time lag related to incorporation of living organic matter into soil and transportation into ocean basins via wind and/or ability of C4 plants to adapt for a longer period before being replaced by C3 plants when subjected to gradual climatic changes. Irregular variations with no clear glacial to interglacial trends in the BOW-8a core may result from complex mixture of aerosols from westerly winds and riverine organic matter from the Bering Sea catchments. In addition, terrestrial organic matter entering the Bering Sea could originate from multiple pathways including eolian, riverine, and ice rafted debris, and possibly be disturbed by turbidity and other local currents which can induce re-suspension and re-sedimentation causing an obliterated time relation in the Bering Sea biomarker records. Article in Journal/Newspaper Bering Sea Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Bering Sea Pacific Chemical Geology 228 4 197 208 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Bering Sea Pacific Ocean n-alkanes stable carbon isotope deep-sea sediments higher plants average chain length 452 |
spellingShingle |
Bering Sea Pacific Ocean n-alkanes stable carbon isotope deep-sea sediments higher plants average chain length 452 Ratnayake, Nalin Prasanna Suzuki, Noriyuki Okada, Makoto Takagi, Miyuki The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years |
topic_facet |
Bering Sea Pacific Ocean n-alkanes stable carbon isotope deep-sea sediments higher plants average chain length 452 |
description |
Two piston cores, one located far from the continents (The North Pacific Ocean: ES core), and another located comparatively closer to the continents (The Bering Sea: BOW-8a core) were investigated to reconstruct environmental changes on source land areas. The results show significant contribution of terrestrial organic matter to sediments in both cores. The δ13C values of n-C27, n-C29, and n-C31 alkanes in sediments from the North Pacific ES core show significant glacial to interglacial variation whereas those from the Bering Sea core do not. Variations of δ13C values of land plant n-alkanes are related to the environmental or vegetational changes in the source land areas. Environmental changes, especially, aridity, rainfall, and pCO2 during glacial/interglacial transitional periods can affect vegetation, and therefore C3 / C4 plant ratios, resulting in δ13C changes in the preserved land plant biomarkers. Maximum values of δ13C as well as maximum average chain length values of long chain n-alkanes in the ES core occur mostly at the interglacial to glacial transition zones reflecting a time lag related to incorporation of living organic matter into soil and transportation into ocean basins via wind and/or ability of C4 plants to adapt for a longer period before being replaced by C3 plants when subjected to gradual climatic changes. Irregular variations with no clear glacial to interglacial trends in the BOW-8a core may result from complex mixture of aerosols from westerly winds and riverine organic matter from the Bering Sea catchments. In addition, terrestrial organic matter entering the Bering Sea could originate from multiple pathways including eolian, riverine, and ice rafted debris, and possibly be disturbed by turbidity and other local currents which can induce re-suspension and re-sedimentation causing an obliterated time relation in the Bering Sea biomarker records. |
format |
Article in Journal/Newspaper |
author |
Ratnayake, Nalin Prasanna Suzuki, Noriyuki Okada, Makoto Takagi, Miyuki |
author_facet |
Ratnayake, Nalin Prasanna Suzuki, Noriyuki Okada, Makoto Takagi, Miyuki |
author_sort |
Ratnayake, Nalin Prasanna |
title |
The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years |
title_short |
The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years |
title_full |
The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years |
title_fullStr |
The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years |
title_full_unstemmed |
The variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the Bering Sea and the North Pacific Ocean during the last 250,000 years |
title_sort |
variations of stable carbon isotope ratio of land plant-derived n-alkanes in deep-sea sediments from the bering sea and the north pacific ocean during the last 250,000 years |
publisher |
Elsevier |
url |
http://hdl.handle.net/2115/13695 https://doi.org/10.1016/j.chemgeo.2005.10.005 |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_relation |
http://www.sciencedirect.com/science/journal/00092541 http://hdl.handle.net/2115/13695 Chemical geology, 228(4): 197-208 http://dx.doi.org/10.1016/j.chemgeo.2005.10.005 |
op_doi |
https://doi.org/10.1016/j.chemgeo.2005.10.005 |
container_title |
Chemical Geology |
container_volume |
228 |
container_issue |
4 |
container_start_page |
197 |
op_container_end_page |
208 |
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1766377059718791168 |