Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cpd-11-2649-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
01 Jul 2015
Review status
This discussion paper is a preprint. It has been under review for the journal Climate of the Past (CP). A final paper in CP is not foreseen.
Atlantic Multidecadal Oscillation (AMO) forcing on the late Holocene Cauca paleolake dynamics, northern Andes of Colombia
J. I. Martínez1, S. Obrochta2, Y. Yokoyama3, and R. W. Battarbee4 1Department Ciencias de la Tierra, Universidad EAFIT, Area de Ciencias del Mar, Medellín, Colombia
2Faculty of International Resources Science, Akita University, Akita, Japan
3Atmospheric and Ocean Research Institute, University of Tokyo, Tokyo, Japan
4ECRC, University College London, London, UK
Abstract. The Atlantic Multidecadal Oscillation (AMO), is a major driving climate mechanism, in the eastern Caribbean Sea and the South Atlantic Ocean in relation to the dynamics of the South American Monsoon System (SAMS) for the late Holocene. Here we document the AMO signal in the San Nicolás-1 core of the Cauca paleolake (Santa Fé–Sopetrán Basin) in the northern Andes. Wavelet spectrum analysis of the gray scale of the San Nicolás-1 core provides evidence for a 70 yr AMO periodicity for the 3750 to 350 yr BP time interval, whose pattern is analogous to the one documented for the Cariaco Basin. This supports a possible correlation between enhanced precipitation and ENSO variability with a positive AMO phase during the 2000 to 1500 yr BP interval, and its forcing role on the Cauca ria lake deposits, which led to increased precipitation and to the transition from a igapo (black water) to a varzea (white water) environment ca. 3000 yr BP.

Citation: Martínez, J. I., Obrochta, S., Yokoyama, Y., and Battarbee, R. W.: Atlantic Multidecadal Oscillation (AMO) forcing on the late Holocene Cauca paleolake dynamics, northern Andes of Colombia, Clim. Past Discuss., 11, 2649-2664, https://doi.org/10.5194/cpd-11-2649-2015, 2015.
J. I. Martínez et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC C1544: 'Review of "Atlantic Multidecadal Oscillation (AMO) forcing on the late Holocene Cauca paleolake dynamics, northern Andes of Colombia" by Martinez et al.', Anonymous Referee #1, 01 Sep 2015 Printer-friendly Version 
 
EC C1892: 'Close Paper Discussion', Ricardo Villalba, 03 Oct 2015 Printer-friendly Version 
J. I. Martínez et al.
J. I. Martínez et al.

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Short summary
The San Nicolás laminated sediments of the Cauca paleolake in the northern Andes were deposited in a ria lake environment at 3750-350 yr BP. Wavelet analysis of the San Nicolás-1 core evidences a 70 yr Atlantic Multidecadal Oscillation (AMO) periodicity, analogous to the Cariaco Basin. This supports a correlation between enhanced precipitation and ENSO variability with a positive AMO phase during the 2000-1500 yr BP interval. Increased precipitation occurred ca. 3000 yr BP.
The San Nicolás laminated sediments of the Cauca paleolake in the northern Andes were deposited...
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