Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change
PP21B-1330 During the last postglacial evolution of the shallow northern Siberian shelf systems regional sea level in the Arctic came to its Holocene highstand some time between 5 to 6 ka. After that time a general stabilization of the sedimentary regime occurred. That is well noted in a drastic dec...
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ftoceanrep:oai:oceanrep.geomar.de:27653 2023-05-15T14:24:19+02:00 Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change Bauch, Henning Abramova, Ekaterina Alenius, Teija Saarnisto, Matti 2014 https://oceanrep.geomar.de/id/eprint/27653/ unknown Bauch, H. , Abramova, E., Alenius, T. and Saarnisto, M. (2014) Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change. [Poster] In: AGU Fall Meeting 2014. , 15.12.-19.12.2014, San Francisco, California, USA . Conference or Workshop Item NonPeerReviewed 2014 ftoceanrep 2023-04-07T15:17:43Z PP21B-1330 During the last postglacial evolution of the shallow northern Siberian shelf systems regional sea level in the Arctic came to its Holocene highstand some time between 5 to 6 ka. After that time a general stabilization of the sedimentary regime occurred. That is well noted in a drastic decrease in sedimentation rates observed in all sediment cores taken from middle to outer shelf water depths of the Laptev Sea. But, at water depths lower than 30 meters – i.e., in the inner shelf and nearer to the coasts – sedimentation continued at relatively higher rates, presumably due to input of terrigenous material from river runoff as well as coastal erosion. Compared with that latter process, the huge Lena Delta should comprise a region of sediment catchment where aggradation wins over erosion. However, little is known about the detailed history of this delta during the second half of the Holocene. In order to gain more insight into this issue we have investigated three islands within the Lena Delta. All of these are comprised of massive peat of several meters in thickness. Picking discrete specimens of water mosses (Sphagnum) only, we have radiocarbon-dated these peat sections. The depth/age relation of the sampled profiles reflect the growth rate of peat. It shows that the islands’ history above the present-day delta-sea level is about 4000 yrs. old. Moreover, a significant change in peat growth occurred after 2500 yrs BP in both, accumulation and composition, and allows the conclusion of a major shift in Arctic environmental conditions since then. Thus, our results may add further information also for other coastal studies, as the ongoing degradation of the rather vulnerable permafrost coast in the Laptev Sea and elsewhere along the North Siberian margin is often mentioned in context with recent Arctic climate change due to global warming. Conference Object Arctic Arctic Climate change Global warming laptev Laptev Sea lena delta permafrost OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Laptev Sea |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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PP21B-1330 During the last postglacial evolution of the shallow northern Siberian shelf systems regional sea level in the Arctic came to its Holocene highstand some time between 5 to 6 ka. After that time a general stabilization of the sedimentary regime occurred. That is well noted in a drastic decrease in sedimentation rates observed in all sediment cores taken from middle to outer shelf water depths of the Laptev Sea. But, at water depths lower than 30 meters – i.e., in the inner shelf and nearer to the coasts – sedimentation continued at relatively higher rates, presumably due to input of terrigenous material from river runoff as well as coastal erosion. Compared with that latter process, the huge Lena Delta should comprise a region of sediment catchment where aggradation wins over erosion. However, little is known about the detailed history of this delta during the second half of the Holocene. In order to gain more insight into this issue we have investigated three islands within the Lena Delta. All of these are comprised of massive peat of several meters in thickness. Picking discrete specimens of water mosses (Sphagnum) only, we have radiocarbon-dated these peat sections. The depth/age relation of the sampled profiles reflect the growth rate of peat. It shows that the islands’ history above the present-day delta-sea level is about 4000 yrs. old. Moreover, a significant change in peat growth occurred after 2500 yrs BP in both, accumulation and composition, and allows the conclusion of a major shift in Arctic environmental conditions since then. Thus, our results may add further information also for other coastal studies, as the ongoing degradation of the rather vulnerable permafrost coast in the Laptev Sea and elsewhere along the North Siberian margin is often mentioned in context with recent Arctic climate change due to global warming. |
format |
Conference Object |
author |
Bauch, Henning Abramova, Ekaterina Alenius, Teija Saarnisto, Matti |
spellingShingle |
Bauch, Henning Abramova, Ekaterina Alenius, Teija Saarnisto, Matti Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change |
author_facet |
Bauch, Henning Abramova, Ekaterina Alenius, Teija Saarnisto, Matti |
author_sort |
Bauch, Henning |
title |
Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change |
title_short |
Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change |
title_full |
Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change |
title_fullStr |
Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change |
title_full_unstemmed |
Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change |
title_sort |
late holocene peat growth at the northern siberian periphery and its relation to arctic climate change |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/27653/ |
geographic |
Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
genre |
Arctic Arctic Climate change Global warming laptev Laptev Sea lena delta permafrost |
genre_facet |
Arctic Arctic Climate change Global warming laptev Laptev Sea lena delta permafrost |
op_relation |
Bauch, H. , Abramova, E., Alenius, T. and Saarnisto, M. (2014) Late Holocene Peat growth at the northern Siberian periphery and its relation to Arctic climate change. [Poster] In: AGU Fall Meeting 2014. , 15.12.-19.12.2014, San Francisco, California, USA . |
_version_ |
1766296752145563648 |