Environmental history of the Laptev Sea : present status and future perspective
Empirical data as well as modelling experiments show that the stability of the Arctic cryosphere is today under threat due to global warming. Along the circum-arctic ocean periphery this cryosphere is comprised of terrestrial permafrost. However, during Quaternary times this frozen landscape was rep...
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ftoceanrep:oai:oceanrep.geomar.de:187 2024-09-30T14:28:30+00:00 Environmental history of the Laptev Sea : present status and future perspective Bauch, Henning Kassens, Heidemarie Klyuvitkina, Tatyana Meyer, Hanno Müller-Lupp, Thomas Polyakova, Yelena Rekant, Pavel Taldenkova, Ekaterina 2006 https://oceanrep.geomar.de/id/eprint/187/ unknown Bauch, H. , Kassens, H., Klyuvitkina, T., Meyer, H., Müller-Lupp, T., Polyakova, Y., Rekant, P. and Taldenkova, E. (2006) Environmental history of the Laptev Sea : present status and future perspective. [Talk] In: 8. Workshop on Russian-German Cooperation: Laptev Sea System. , 07.02.-09.02.2006, St. Petersburg, Russia . Conference or Workshop Item NonPeerReviewed 2006 ftoceanrep 2024-09-04T05:04:40Z Empirical data as well as modelling experiments show that the stability of the Arctic cryosphere is today under threat due to global warming. Along the circum-arctic ocean periphery this cryosphere is comprised of terrestrial permafrost. However, during Quaternary times this frozen landscape was repeatedly changed due to global sea-level fluctuations which particularly affected the wide and shallow Siberian shelves. As western part of the Beringian landmass the entire Laptev Sea shelf was subaerially exposed in last glacial times. During the ensuing postglacial global sea-level rise this region gradually changed from a terrestrial permafrost landscape into a shallow marine shelf environment. Various geochemical, micropaleontological, palynological, and sedimentological data obtained from both conventional gravity cores and drill cores reveal the strong influence of this tranformation process on the shelf environment. Our previous scientific drilling campaign (2000), conducted to the outer Laptev Sea shelf with the goal to recover pre-Holocene sediments from acoustically transparent sections, confirmed the existence of frozen, and ice-bearing terrestrial sediments below a soft, marine sediment package of Holocene age. However, oxygen isotope composition of the ice unveiled that these frozen sediments must have been altered by re-freezing processes during and after the transgression. This assumption seems now corroborated by new high-resolution acoustic data from the mid- to inner shelf region gained during the latest expeditions in 2004. Although the overall scenario of shelf transformation for the time since the last sea level rise seems to be reasonably well understood now, there is no information available so far from older climatic intervals with conditions comparable to the Holocene. But such information from Holocene-like climate intervals will contribute useful insight for predictive purposes, since these records would then provide a longer time frame within which to evaluate natural variability in ... Conference Object arctic cryosphere Arctic Arctic Ocean Global warming Ice laptev Laptev Sea permafrost OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Laptev Sea |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
unknown |
description |
Empirical data as well as modelling experiments show that the stability of the Arctic cryosphere is today under threat due to global warming. Along the circum-arctic ocean periphery this cryosphere is comprised of terrestrial permafrost. However, during Quaternary times this frozen landscape was repeatedly changed due to global sea-level fluctuations which particularly affected the wide and shallow Siberian shelves. As western part of the Beringian landmass the entire Laptev Sea shelf was subaerially exposed in last glacial times. During the ensuing postglacial global sea-level rise this region gradually changed from a terrestrial permafrost landscape into a shallow marine shelf environment. Various geochemical, micropaleontological, palynological, and sedimentological data obtained from both conventional gravity cores and drill cores reveal the strong influence of this tranformation process on the shelf environment. Our previous scientific drilling campaign (2000), conducted to the outer Laptev Sea shelf with the goal to recover pre-Holocene sediments from acoustically transparent sections, confirmed the existence of frozen, and ice-bearing terrestrial sediments below a soft, marine sediment package of Holocene age. However, oxygen isotope composition of the ice unveiled that these frozen sediments must have been altered by re-freezing processes during and after the transgression. This assumption seems now corroborated by new high-resolution acoustic data from the mid- to inner shelf region gained during the latest expeditions in 2004. Although the overall scenario of shelf transformation for the time since the last sea level rise seems to be reasonably well understood now, there is no information available so far from older climatic intervals with conditions comparable to the Holocene. But such information from Holocene-like climate intervals will contribute useful insight for predictive purposes, since these records would then provide a longer time frame within which to evaluate natural variability in ... |
format |
Conference Object |
author |
Bauch, Henning Kassens, Heidemarie Klyuvitkina, Tatyana Meyer, Hanno Müller-Lupp, Thomas Polyakova, Yelena Rekant, Pavel Taldenkova, Ekaterina |
spellingShingle |
Bauch, Henning Kassens, Heidemarie Klyuvitkina, Tatyana Meyer, Hanno Müller-Lupp, Thomas Polyakova, Yelena Rekant, Pavel Taldenkova, Ekaterina Environmental history of the Laptev Sea : present status and future perspective |
author_facet |
Bauch, Henning Kassens, Heidemarie Klyuvitkina, Tatyana Meyer, Hanno Müller-Lupp, Thomas Polyakova, Yelena Rekant, Pavel Taldenkova, Ekaterina |
author_sort |
Bauch, Henning |
title |
Environmental history of the Laptev Sea : present status and future perspective |
title_short |
Environmental history of the Laptev Sea : present status and future perspective |
title_full |
Environmental history of the Laptev Sea : present status and future perspective |
title_fullStr |
Environmental history of the Laptev Sea : present status and future perspective |
title_full_unstemmed |
Environmental history of the Laptev Sea : present status and future perspective |
title_sort |
environmental history of the laptev sea : present status and future perspective |
publishDate |
2006 |
url |
https://oceanrep.geomar.de/id/eprint/187/ |
geographic |
Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Laptev Sea |
genre |
arctic cryosphere Arctic Arctic Ocean Global warming Ice laptev Laptev Sea permafrost |
genre_facet |
arctic cryosphere Arctic Arctic Ocean Global warming Ice laptev Laptev Sea permafrost |
op_relation |
Bauch, H. , Kassens, H., Klyuvitkina, T., Meyer, H., Müller-Lupp, T., Polyakova, Y., Rekant, P. and Taldenkova, E. (2006) Environmental history of the Laptev Sea : present status and future perspective. [Talk] In: 8. Workshop on Russian-German Cooperation: Laptev Sea System. , 07.02.-09.02.2006, St. Petersburg, Russia . |
_version_ |
1811634145123631104 |