Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic
Reconstructions of the postglacial evolution of the Laptev Sea shelf have shown that regional sea level came to its Holocene highstand some time between 5 to 6 ka. During the time after a general stabilization of the sedimentary regime occurred. That is well noted in a drastic decrease in sedimentat...
Main Author: | |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
2014
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/27629/ |
id |
ftoceanrep:oai:oceanrep.geomar.de:27629 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:27629 2023-05-15T14:27:08+02:00 Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic Bauch, Henning A. 2014 https://oceanrep.geomar.de/id/eprint/27629/ unknown Bauch, H. A. (2014) Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic. [Talk] In: 2. PAST Gateways International Conference and Workshop. , 19.05.-23.05.2014, Trieste, Italy . Proceedings of the II PAST Gateways International Conference and Workshop : Trieste, May 19-23, 2014 / Istituto Nazionale di Oceanografia e di Geofisica Sperimentale. Eds.: Renata G. Lucchi Colm O’Cofaigh Michele Rebesco Carlo Barbante. pp. 49-50 . Conference or Workshop Item NonPeerReviewed 2014 ftoceanrep 2023-04-07T15:17:43Z Reconstructions of the postglacial evolution of the Laptev Sea shelf have shown that regional sea level came to its Holocene highstand some time between 5 to 6 ka. During the time after 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. 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 radiocarbondated 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 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
unknown |
description |
Reconstructions of the postglacial evolution of the Laptev Sea shelf have shown that regional sea level came to its Holocene highstand some time between 5 to 6 ka. During the time after 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. 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 radiocarbondated 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 A. |
spellingShingle |
Bauch, Henning A. Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic |
author_facet |
Bauch, Henning A. |
author_sort |
Bauch, Henning A. |
title |
Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic |
title_short |
Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic |
title_full |
Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic |
title_fullStr |
Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic |
title_full_unstemmed |
Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic |
title_sort |
peat growth in the lena delta and its relation to late holocene climate change in the arctic |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/27629/ |
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. A. (2014) Peat growth in the Lena Delta and its relation to late Holocene climate change in the Arctic. [Talk] In: 2. PAST Gateways International Conference and Workshop. , 19.05.-23.05.2014, Trieste, Italy . Proceedings of the II PAST Gateways International Conference and Workshop : Trieste, May 19-23, 2014 / Istituto Nazionale di Oceanografia e di Geofisica Sperimentale. Eds.: Renata G. Lucchi Colm O’Cofaigh Michele Rebesco Carlo Barbante. pp. 49-50 . |
_version_ |
1766300743910817792 |