Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics
The last glacial period was punctuated by abrupt climatic events with extrema known as Heinrich and Dansgaard–Oeschger events. These millennial events have been the subject of many paleoreconstructions and model experiments in the past decades, but yet the hydrological processes involved remain elus...
Published in: | Climate of the Past |
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Language: | English |
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Copernicus Gesellschaft Mbh
2015
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Online Access: | https://doi.org/10.5194/cp-11-1507-2015 https://archimer.ifremer.fr/doc/00296/40767/39770.pdf https://archimer.ifremer.fr/doc/00296/40767/39771.pdf https://archimer.ifremer.fr/doc/00296/40767/48240.pdf https://archimer.ifremer.fr/doc/00296/40767/ |
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fttriple:oai:gotriple.eu:NSKo7bLpMFyH01JX_ETia 2023-05-15T16:00:05+02:00 Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics Wary, M. Eynaud, F. Sabine, M. Zaragosi, S. Rossignol, L. Malaize, B. Palis, E. Zumaque, J. Caulle, C. Penaud, A. Michel, E. Charlier, K. 2015-01-01 https://doi.org/10.5194/cp-11-1507-2015 https://archimer.ifremer.fr/doc/00296/40767/39770.pdf https://archimer.ifremer.fr/doc/00296/40767/39771.pdf https://archimer.ifremer.fr/doc/00296/40767/48240.pdf https://archimer.ifremer.fr/doc/00296/40767/ en eng Copernicus Gesellschaft Mbh Copernicus Publications doi:10.5194/cp-11-1507-2015 10670/1.63d3t9 1814-9324 1814-9332 https://archimer.ifremer.fr/doc/00296/40767/39770.pdf https://archimer.ifremer.fr/doc/00296/40767/39771.pdf https://archimer.ifremer.fr/doc/00296/40767/48240.pdf https://archimer.ifremer.fr/doc/00296/40767/ lic_creative-commons other undefined Archimer, archive institutionnelle de l'Ifremer Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2015 , Vol. 11 , N. 11 , P. 1507-1525 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2015 fttriple https://doi.org/10.5194/cp-11-1507-2015 2023-01-22T17:54:45Z The last glacial period was punctuated by abrupt climatic events with extrema known as Heinrich and Dansgaard–Oeschger events. These millennial events have been the subject of many paleoreconstructions and model experiments in the past decades, but yet the hydrological processes involved remain elusive. In the present work, high-resolution analyses were conducted on the 12–42 ka BP section of core MD99-2281 retrieved southwest of the Faeroe Islands, and combined with analyses conducted in two previous studies (Zumaque et al., 2012; Caulle et al., 2013). Such a multiproxy approach, coupling micropaleontological, geochemical and sedimentological analyses, allows us to track surface, subsurface, and deep hydrological processes occurring during these rapid climatic changes. Records indicate that the coldest episodes of the studied period (Greenland stadials and Heinrich stadials) were characterized by a strong stratification of surface waters. This surface stratification seems to have played a key role in the dynamics of subsurface and deep-water masses. Indeed, periods of high surface stratification are marked by a coupling of subsurface and deep circulations which sharply weaken at the beginning of stadials, while surface conditions progressively deteriorate throughout these cold episodes; conversely, periods of decreasing surface stratification (Greenland interstadials) are characterized by a coupling of surface and deep hydrological processes, with progressively milder surface conditions and gradual intensification of the deep circulation, while the vigor of the subsurface northward Atlantic flow remains constantly high. Our results also reveal different and atypical hydrological signatures during Heinrich stadials (HSs): while HS1 and HS4 exhibit a "usual" scheme with reduced overturning circulation, a relatively active North Atlantic circulation seems to have prevailed during HS2, and HS3 seems to have experienced a re-intensification of this circulation during the middle of the event. Our findings thus bring ... Article in Journal/Newspaper Dansgaard-Oeschger events Greenland North Atlantic Unknown Greenland Climate of the Past 11 11 1507 1525 |
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language |
English |
topic |
geo envir |
spellingShingle |
geo envir Wary, M. Eynaud, F. Sabine, M. Zaragosi, S. Rossignol, L. Malaize, B. Palis, E. Zumaque, J. Caulle, C. Penaud, A. Michel, E. Charlier, K. Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
topic_facet |
geo envir |
description |
The last glacial period was punctuated by abrupt climatic events with extrema known as Heinrich and Dansgaard–Oeschger events. These millennial events have been the subject of many paleoreconstructions and model experiments in the past decades, but yet the hydrological processes involved remain elusive. In the present work, high-resolution analyses were conducted on the 12–42 ka BP section of core MD99-2281 retrieved southwest of the Faeroe Islands, and combined with analyses conducted in two previous studies (Zumaque et al., 2012; Caulle et al., 2013). Such a multiproxy approach, coupling micropaleontological, geochemical and sedimentological analyses, allows us to track surface, subsurface, and deep hydrological processes occurring during these rapid climatic changes. Records indicate that the coldest episodes of the studied period (Greenland stadials and Heinrich stadials) were characterized by a strong stratification of surface waters. This surface stratification seems to have played a key role in the dynamics of subsurface and deep-water masses. Indeed, periods of high surface stratification are marked by a coupling of subsurface and deep circulations which sharply weaken at the beginning of stadials, while surface conditions progressively deteriorate throughout these cold episodes; conversely, periods of decreasing surface stratification (Greenland interstadials) are characterized by a coupling of surface and deep hydrological processes, with progressively milder surface conditions and gradual intensification of the deep circulation, while the vigor of the subsurface northward Atlantic flow remains constantly high. Our results also reveal different and atypical hydrological signatures during Heinrich stadials (HSs): while HS1 and HS4 exhibit a "usual" scheme with reduced overturning circulation, a relatively active North Atlantic circulation seems to have prevailed during HS2, and HS3 seems to have experienced a re-intensification of this circulation during the middle of the event. Our findings thus bring ... |
format |
Article in Journal/Newspaper |
author |
Wary, M. Eynaud, F. Sabine, M. Zaragosi, S. Rossignol, L. Malaize, B. Palis, E. Zumaque, J. Caulle, C. Penaud, A. Michel, E. Charlier, K. |
author_facet |
Wary, M. Eynaud, F. Sabine, M. Zaragosi, S. Rossignol, L. Malaize, B. Palis, E. Zumaque, J. Caulle, C. Penaud, A. Michel, E. Charlier, K. |
author_sort |
Wary, M. |
title |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_short |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_full |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_fullStr |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_full_unstemmed |
Stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
title_sort |
stratification of surface waters during the last glacial millennial climatic events: a key factor in subsurface and deep-water mass dynamics |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2015 |
url |
https://doi.org/10.5194/cp-11-1507-2015 https://archimer.ifremer.fr/doc/00296/40767/39770.pdf https://archimer.ifremer.fr/doc/00296/40767/39771.pdf https://archimer.ifremer.fr/doc/00296/40767/48240.pdf https://archimer.ifremer.fr/doc/00296/40767/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Dansgaard-Oeschger events Greenland North Atlantic |
genre_facet |
Dansgaard-Oeschger events Greenland North Atlantic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Climate Of The Past (1814-9324) (Copernicus Gesellschaft Mbh), 2015 , Vol. 11 , N. 11 , P. 1507-1525 |
op_relation |
doi:10.5194/cp-11-1507-2015 10670/1.63d3t9 1814-9324 1814-9332 https://archimer.ifremer.fr/doc/00296/40767/39770.pdf https://archimer.ifremer.fr/doc/00296/40767/39771.pdf https://archimer.ifremer.fr/doc/00296/40767/48240.pdf https://archimer.ifremer.fr/doc/00296/40767/ |
op_rights |
lic_creative-commons other undefined |
op_doi |
https://doi.org/10.5194/cp-11-1507-2015 |
container_title |
Climate of the Past |
container_volume |
11 |
container_issue |
11 |
container_start_page |
1507 |
op_container_end_page |
1525 |
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1766395958885613568 |