Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus
The climate of the last 150 kyr is mainly driven by orbital forcing leading to long-lasting glacial conditions framed by the short warm periods Eemian and Holocene. To understand this climate variability it is crucial to investigate the response of the Atlantic Meridional Overturning Circulation (AM...
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ftunivheidelb:oai:archiv.ub.uni-heidelberg.de:16524 2023-11-05T03:44:15+01:00 Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus Böhm, Evelyn 2014 application/pdf https://archiv.ub.uni-heidelberg.de/volltextserver/16524/ https://archiv.ub.uni-heidelberg.de/volltextserver/16524/1/Diss_EvelynBoehm.pdf https://doi.org/10.11588/heidok.00016524 https://nbn-resolving.org/urn:nbn:de:bsz:16-heidok-165244 ger ger https://archiv.ub.uni-heidelberg.de/volltextserver/16524/1/Diss_EvelynBoehm.pdf doi:10.11588/heidok.00016524 urn:nbn:de:bsz:16-heidok-165244 Böhm, Evelyn (2014) Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus. [Dissertation] info:eu-repo/semantics/openAccess http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html 500 500 Natural sciences and mathematics 550 550 Earth sciences Dissertation info:eu-repo/semantics/doctoralThesis NonPeerReviewed 2014 ftunivheidelb https://doi.org/10.11588/heidok.00016524 2023-10-10T12:06:58Z The climate of the last 150 kyr is mainly driven by orbital forcing leading to long-lasting glacial conditions framed by the short warm periods Eemian and Holocene. To understand this climate variability it is crucial to investigate the response of the Atlantic Meridional Overturning Circulation (AMOC) on the insolation and the consequent effect it has on the climate by redistributing heat and CO2. However, the mechanisms that determine changes of the AMOC are poorly understood within the investigated time period. In this study the strength and direction of the AMOC is examined by temporal high-resolution measurements of the two proxies 231Pa/230Th and eNd from the marine sediment core ODP 1063 which is situated in the North West Atlantic. Despite the short half life of 231Pa, significant 231Pa/230Th ratios were obtained until 134 kyr which extends the so far released scope by 9 kyr. During Dansgaard-Oeschger warm events variations in the northern deep water formation and circulation dynamics are found. Further, rarely detected Heinrich cold events from the early glacial (H7, H9 and H10) are identified. It is demonstrated that the Termination II lacks a Younger Dryas-like cold event due to differences in the summer insolation. Instead to the widely perceped view of a generally shallow and weak AMOC during full glacial conditions, a reduced circulation strength associated with northern sourced water in the deep Atlantic during MIS 4 and the early MIS 3 are found. Due to the significant difference of this pattern to the so far described circulation modes, the new `intermediate mode' is defined. Doctoral or Postdoctoral Thesis North West Atlantic Heidelberg University: HeiDok |
institution |
Open Polar |
collection |
Heidelberg University: HeiDok |
op_collection_id |
ftunivheidelb |
language |
German |
topic |
500 500 Natural sciences and mathematics 550 550 Earth sciences |
spellingShingle |
500 500 Natural sciences and mathematics 550 550 Earth sciences Böhm, Evelyn Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus |
topic_facet |
500 500 Natural sciences and mathematics 550 550 Earth sciences |
description |
The climate of the last 150 kyr is mainly driven by orbital forcing leading to long-lasting glacial conditions framed by the short warm periods Eemian and Holocene. To understand this climate variability it is crucial to investigate the response of the Atlantic Meridional Overturning Circulation (AMOC) on the insolation and the consequent effect it has on the climate by redistributing heat and CO2. However, the mechanisms that determine changes of the AMOC are poorly understood within the investigated time period. In this study the strength and direction of the AMOC is examined by temporal high-resolution measurements of the two proxies 231Pa/230Th and eNd from the marine sediment core ODP 1063 which is situated in the North West Atlantic. Despite the short half life of 231Pa, significant 231Pa/230Th ratios were obtained until 134 kyr which extends the so far released scope by 9 kyr. During Dansgaard-Oeschger warm events variations in the northern deep water formation and circulation dynamics are found. Further, rarely detected Heinrich cold events from the early glacial (H7, H9 and H10) are identified. It is demonstrated that the Termination II lacks a Younger Dryas-like cold event due to differences in the summer insolation. Instead to the widely perceped view of a generally shallow and weak AMOC during full glacial conditions, a reduced circulation strength associated with northern sourced water in the deep Atlantic during MIS 4 and the early MIS 3 are found. Due to the significant difference of this pattern to the so far described circulation modes, the new `intermediate mode' is defined. |
format |
Doctoral or Postdoctoral Thesis |
author |
Böhm, Evelyn |
author_facet |
Böhm, Evelyn |
author_sort |
Böhm, Evelyn |
title |
Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus |
title_short |
Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus |
title_full |
Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus |
title_fullStr |
Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus |
title_full_unstemmed |
Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus |
title_sort |
rekonstruktion der atlantischen zirkulation innerhalb des letzten glazialen zyklus |
publishDate |
2014 |
url |
https://archiv.ub.uni-heidelberg.de/volltextserver/16524/ https://archiv.ub.uni-heidelberg.de/volltextserver/16524/1/Diss_EvelynBoehm.pdf https://doi.org/10.11588/heidok.00016524 https://nbn-resolving.org/urn:nbn:de:bsz:16-heidok-165244 |
genre |
North West Atlantic |
genre_facet |
North West Atlantic |
op_relation |
https://archiv.ub.uni-heidelberg.de/volltextserver/16524/1/Diss_EvelynBoehm.pdf doi:10.11588/heidok.00016524 urn:nbn:de:bsz:16-heidok-165244 Böhm, Evelyn (2014) Rekonstruktion der Atlantischen Zirkulation innerhalb des letzten Glazialen Zyklus. [Dissertation] |
op_rights |
info:eu-repo/semantics/openAccess http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html |
op_doi |
https://doi.org/10.11588/heidok.00016524 |
_version_ |
1781703676161687552 |