NDLI: Ocean-atmosphere climate shift during the mid-to-late Holocene transition

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Ocean-atmosphere climate shift during the mid-to-late Holocene transition

Content Provider	Semantic Scholar
Author	Morley, Audrey Rosenthal, Yair Menocal, Peter B. De
Copyright Year	2014
Abstract	Article history: 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 )f rom as ediment core off NW Africa (889 md epth) between 0t o 5.5 ka. Our results show that Eastern North Atlantic Central Waters (ENACW) cooled by ∼1 ◦ ±0.7 ◦ Ca nd densities decreased by σθ = 0.4 ± 0. 2b etween 3.3 and 2.6 ka. This shift in ENACW hydrography illustrates at ransition 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. Published by Elsevier B.V.
Starting Page	18
Ending Page	26
Page Count	9
File Format	PDF HTM / HTML
DOI	10.1016/j.epsl.2013.11.039
Volume Number	388
Alternate Webpage(s)	http://meetingorganizer.copernicus.org/EGU2014/EGU2014-662.pdf
Alternate Webpage(s)	http://www.ldeo.columbia.edu/~peter/site/Papers_files/Morley.etal.2013.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.epsl.2013.11.039
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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