A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years
On the basis of various lithological, micropaleontological and isotopic proxy records covering the last 30,000 calendar years (cal kyr) the paleoenvironmental evolution of the deep and surface water circulation in the subarctic Nordic seas was reconstructed for a climate interval characterized by in...
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2001
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Online Access: | https://epic.awi.de/id/eprint/3705/ https://doi.org/10.1016/S0277-3791(00)00098-6 https://hdl.handle.net/10013/epic.14282 |
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ftawi:oai:epic.awi.de:3705 2023-09-05T13:17:44+02:00 A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years Bauch, H. A. Erlenkeuser, H. Spielhagen, Robert F. Struck, U. Matthießen, Jens Thiede, Jörn Heinemeier, J. 2001 https://epic.awi.de/id/eprint/3705/ https://doi.org/10.1016/S0277-3791(00)00098-6 https://hdl.handle.net/10013/epic.14282 unknown Bauch, H. A. , Erlenkeuser, H. , Spielhagen, R. F. , Struck, U. , Matthießen, J. orcid:0000-0002-6952-2494 , Thiede, J. and Heinemeier, J. (2001) A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years , Quaternary Science Reviews, 20 , pp. 659-678 . doi:10.1016/S0277-3791(00)00098-6 <https://doi.org/10.1016/S0277-3791%2800%2900098-6> , hdl:10013/epic.14282 EPIC3Quaternary Science Reviews, 20, pp. 659-678 Article isiRev 2001 ftawi https://doi.org/10.1016/S0277-3791(00)00098-6 2023-08-22T19:44:11Z On the basis of various lithological, micropaleontological and isotopic proxy records covering the last 30,000 calendar years (cal kyr) the paleoenvironmental evolution of the deep and surface water circulation in the subarctic Nordic seas was reconstructed for a climate interval characterized by intensive ice-sheet growth and subsequent decay on the surrounding land masses. The data revealconsiderable temporal changes in the type of thermohaline circulation. Open-water convection prevailed in the early record,providing moisture for the Fennoscandian-Barents ice sheets to grow until they reached the shelf break at &26 cal. kyr and started to deliver high amounts of ice-rafted debris (IRD) into the ocean via melting icebergs. Low epibenthic d 18O values and small-sized subpolar foraminifera observed after 26 cal. kyr may implicate that advection of Atlantic water into the Nordic seas occurred at the subsurface until 15 cal. kyr. Although modern-like surface and deep-water conditions first developed at ca. 13.5 cal. kyr, thermohaline circulation remained unstable, switching between a subsurface and surface advection of Atlantic water until 10 cal. kyr when IRDdeposition and major input of meltwater ceased. During this time, two depletions in epibenthic d 13 C are recognized just before and after the Younger Dryas indicating a notable reduction in convectional processes. Despite an intermittent cooling at ca 8 cal. kyr,warmest surface conditions existed in the central Nordic seas between 10 and 6 cal. kyr. However, already after 7 cal. kyr the present day situation gradually evolved, verified by a strong water mass exchange with the Arctic Ocean and an intensifying deep convection as well as surface temperature decrease in the central Nordic seas. This process led to the development of the modern distribution of water masses and associated oceanographic fronts after 5 cal. kyr and, eventually, to today's steep east}west surface temperaturegradient. The time discrepancy between intensive vertical convection ... Article in Journal/Newspaper Arctic Arctic Ocean Fennoscandian Foraminifera* Ice Sheet Iceberg* Nordic Seas Subarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Quaternary Science Reviews 20 4 659 678 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
On the basis of various lithological, micropaleontological and isotopic proxy records covering the last 30,000 calendar years (cal kyr) the paleoenvironmental evolution of the deep and surface water circulation in the subarctic Nordic seas was reconstructed for a climate interval characterized by intensive ice-sheet growth and subsequent decay on the surrounding land masses. The data revealconsiderable temporal changes in the type of thermohaline circulation. Open-water convection prevailed in the early record,providing moisture for the Fennoscandian-Barents ice sheets to grow until they reached the shelf break at &26 cal. kyr and started to deliver high amounts of ice-rafted debris (IRD) into the ocean via melting icebergs. Low epibenthic d 18O values and small-sized subpolar foraminifera observed after 26 cal. kyr may implicate that advection of Atlantic water into the Nordic seas occurred at the subsurface until 15 cal. kyr. Although modern-like surface and deep-water conditions first developed at ca. 13.5 cal. kyr, thermohaline circulation remained unstable, switching between a subsurface and surface advection of Atlantic water until 10 cal. kyr when IRDdeposition and major input of meltwater ceased. During this time, two depletions in epibenthic d 13 C are recognized just before and after the Younger Dryas indicating a notable reduction in convectional processes. Despite an intermittent cooling at ca 8 cal. kyr,warmest surface conditions existed in the central Nordic seas between 10 and 6 cal. kyr. However, already after 7 cal. kyr the present day situation gradually evolved, verified by a strong water mass exchange with the Arctic Ocean and an intensifying deep convection as well as surface temperature decrease in the central Nordic seas. This process led to the development of the modern distribution of water masses and associated oceanographic fronts after 5 cal. kyr and, eventually, to today's steep east}west surface temperaturegradient. The time discrepancy between intensive vertical convection ... |
format |
Article in Journal/Newspaper |
author |
Bauch, H. A. Erlenkeuser, H. Spielhagen, Robert F. Struck, U. Matthießen, Jens Thiede, Jörn Heinemeier, J. |
spellingShingle |
Bauch, H. A. Erlenkeuser, H. Spielhagen, Robert F. Struck, U. Matthießen, Jens Thiede, Jörn Heinemeier, J. A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years |
author_facet |
Bauch, H. A. Erlenkeuser, H. Spielhagen, Robert F. Struck, U. Matthießen, Jens Thiede, Jörn Heinemeier, J. |
author_sort |
Bauch, H. A. |
title |
A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years |
title_short |
A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years |
title_full |
A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years |
title_fullStr |
A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years |
title_full_unstemmed |
A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years |
title_sort |
multiproxy reconstruction of the evolution of deep and surface waters in the nordic seas over the last 30,000 years |
publishDate |
2001 |
url |
https://epic.awi.de/id/eprint/3705/ https://doi.org/10.1016/S0277-3791(00)00098-6 https://hdl.handle.net/10013/epic.14282 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Fennoscandian Foraminifera* Ice Sheet Iceberg* Nordic Seas Subarctic |
genre_facet |
Arctic Arctic Ocean Fennoscandian Foraminifera* Ice Sheet Iceberg* Nordic Seas Subarctic |
op_source |
EPIC3Quaternary Science Reviews, 20, pp. 659-678 |
op_relation |
Bauch, H. A. , Erlenkeuser, H. , Spielhagen, R. F. , Struck, U. , Matthießen, J. orcid:0000-0002-6952-2494 , Thiede, J. and Heinemeier, J. (2001) A multiproxy reconstruction of the evolution of deep and surface waters in the Nordic Seas over the last 30,000 years , Quaternary Science Reviews, 20 , pp. 659-678 . doi:10.1016/S0277-3791(00)00098-6 <https://doi.org/10.1016/S0277-3791%2800%2900098-6> , hdl:10013/epic.14282 |
op_doi |
https://doi.org/10.1016/S0277-3791(00)00098-6 |
container_title |
Quaternary Science Reviews |
container_volume |
20 |
container_issue |
4 |
container_start_page |
659 |
op_container_end_page |
678 |
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1776198794478616576 |