Ocean-atmosphere climate shift during the mid-to-late Holocene transition
Climate records of the mid-to-late Holocene transition, between 3–4 thousand years before present (ka), often exhibit a rapid change in response to the gradual change in orbital insolation. Here we investigate North Atlantic Central Water circulation as a possible mechanism regulating the latitudina...
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2014
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ftdatacite:10.7916/d82v2d6p 2023-05-15T17:29:13+02:00 Ocean-atmosphere climate shift during the mid-to-late Holocene transition Morely, Audrey Rosenthal, Yair DeMenocal, Peter B. 2014 https://dx.doi.org/10.7916/d82v2d6p https://academiccommons.columbia.edu/doi/10.7916/D82V2D6P unknown Columbia University https://dx.doi.org/10.1016/j.epsl.2013.11.039 Oceanography Paleoclimatology Hydrology Text Articles article-journal ScholarlyArticle 2014 ftdatacite https://doi.org/10.7916/d82v2d6p https://doi.org/10.1016/j.epsl.2013.11.039 2021-11-05T12:55:41Z Climate records of the mid-to-late Holocene transition, between 3–4 thousand years before present (ka), often exhibit a rapid change in response to the gradual change in orbital insolation. Here we investigate North Atlantic Central Water circulation as a possible mechanism regulating the latitudinal temperature gradient (LTG), which, in turn, amplifies climate sensitivity to small changes in solar irradiance. Through this mechanism, sharp climate events and transitions are the result of a positive feedback process that propagates and amplifies climate events in the North Atlantic region. We explore these linkages using an intermediate water temperature record reconstructed from Mg/Ca measurements of benthic foraminifera (Hyalinea balthica) from a sediment core off NW Africa (889 m depth) between 0 to 5.5 ka. Our results show that Eastern North Atlantic Central Waters (ENACW) cooled by ~1°±0.7 °C~1°±0.7 °C and densities decreased by σθ=0.4±0.2σθ=0.4±0.2 between 3.3 and 2.6 ka. This shift in ENACW hydrography illustrates a transition towards enhanced mid-latitude atmospheric circulation after 2.7 ka in particular during cold events of the late-Holocene. The presented records demonstrate the important role of ENACW circulation in propagating the climate signatures of the LTG by reducing the meridional heat transfer from high to low latitudes during the transition from the Holocene Thermal Maximum to the late-Holocene. In addition, the dynamic response of ENACW circulation to the gradual climate forcing of LTGs provides a prime example of an amplifying climate feedback mechanism. Text North Atlantic DataCite Metadata Store (German National Library of Science and Technology) |
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Oceanography Paleoclimatology Hydrology |
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Oceanography Paleoclimatology Hydrology Morely, Audrey Rosenthal, Yair DeMenocal, Peter B. Ocean-atmosphere climate shift during the mid-to-late Holocene transition |
topic_facet |
Oceanography Paleoclimatology Hydrology |
description |
Climate records of the mid-to-late Holocene transition, between 3–4 thousand years before present (ka), often exhibit a rapid change in response to the gradual change in orbital insolation. Here we investigate North Atlantic Central Water circulation as a possible mechanism regulating the latitudinal temperature gradient (LTG), which, in turn, amplifies climate sensitivity to small changes in solar irradiance. Through this mechanism, sharp climate events and transitions are the result of a positive feedback process that propagates and amplifies climate events in the North Atlantic region. We explore these linkages using an intermediate water temperature record reconstructed from Mg/Ca measurements of benthic foraminifera (Hyalinea balthica) from a sediment core off NW Africa (889 m depth) between 0 to 5.5 ka. Our results show that Eastern North Atlantic Central Waters (ENACW) cooled by ~1°±0.7 °C~1°±0.7 °C and densities decreased by σθ=0.4±0.2σθ=0.4±0.2 between 3.3 and 2.6 ka. This shift in ENACW hydrography illustrates a transition towards enhanced mid-latitude atmospheric circulation after 2.7 ka in particular during cold events of the late-Holocene. The presented records demonstrate the important role of ENACW circulation in propagating the climate signatures of the LTG by reducing the meridional heat transfer from high to low latitudes during the transition from the Holocene Thermal Maximum to the late-Holocene. In addition, the dynamic response of ENACW circulation to the gradual climate forcing of LTGs provides a prime example of an amplifying climate feedback mechanism. |
format |
Text |
author |
Morely, Audrey Rosenthal, Yair DeMenocal, Peter B. |
author_facet |
Morely, Audrey Rosenthal, Yair DeMenocal, Peter B. |
author_sort |
Morely, Audrey |
title |
Ocean-atmosphere climate shift during the mid-to-late Holocene transition |
title_short |
Ocean-atmosphere climate shift during the mid-to-late Holocene transition |
title_full |
Ocean-atmosphere climate shift during the mid-to-late Holocene transition |
title_fullStr |
Ocean-atmosphere climate shift during the mid-to-late Holocene transition |
title_full_unstemmed |
Ocean-atmosphere climate shift during the mid-to-late Holocene transition |
title_sort |
ocean-atmosphere climate shift during the mid-to-late holocene transition |
publisher |
Columbia University |
publishDate |
2014 |
url |
https://dx.doi.org/10.7916/d82v2d6p https://academiccommons.columbia.edu/doi/10.7916/D82V2D6P |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://dx.doi.org/10.1016/j.epsl.2013.11.039 |
op_doi |
https://doi.org/10.7916/d82v2d6p https://doi.org/10.1016/j.epsl.2013.11.039 |
_version_ |
1766122873606373376 |