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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/cpd-11-1407-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/cpd-11-1407-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 17 Apr 2015

Research article | 17 Apr 2015

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This discussion paper is a preprint. It has been under review for the journal Climate of the Past (CP). The manuscript was not accepted for further review after discussion.

Millennial-scale precipitation variability over Easter Island (South Pacific) during MIS 3: inter-hemispheric teleconnections with North Atlantic abrupt cold events

O. Margalef1, I. Cacho2, S. Pla-Rabes1, N. Cañellas-Boltà3, J. J. Pueyo2, A. Sáez2, L. D. Pena2, B. L. Valero-Garcés4, V. Rull3, and S. Giralt3 O. Margalef et al.
  • 1Ecological Research Center and Forestry Applications (CREAF), Campus de Bellaterra (UAB) 08193 Cerdanyola del Vallès, Barcelona, Spain
  • 2Faculty of Geology, Universitat de Barcelona, Martí Franquès s/n, 08028 Barcelona, Spain
  • 3Institute of Earth Sciences Jaume Almera (ICTJA-CSIC), Sedimentary Geology and Geohazards, Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain
  • 4Pyrenean Institute of Ecology (IPCSIC), Avda, de Montañana 1005, 50059 Zaragoza, Spain

Abstract. Marine Isotope Stage 3 (MIS 3, 59.4–27.8 kyr BP) is characterized by the occurrence of rapid millennial-scale climate oscillations known as Dansgaard–Oeschger cycles (DO) and by abrupt cooling events in the North Atlantic known as Heinrich events. Although both the timing and dynamics of these events have been broadly explored in North Atlantic records, the response of the tropical and subtropical latitudes to these rapid climatic excursions, particularly in the Southern Hemisphere, still remains unclear. The Rano Aroi peat record (Easter Island, 27° S) provides a unique opportunity to understand atmospheric and oceanic changes in the South Pacific during these DO cycles because of its singular location, which is influenced by the South Pacific Anticyclone (SPA), the Southern Westerlies (SW), and the Intertropical Convergence Zone (ITCZ) linked to the South Pacific Convergence Zone (SPCZ). The Rano Aroi sequence records 6 major events of enhanced precipitation between 38 and 65 kyr BP. These events are compared with other hydrological records from the tropical and subtropical band supporting a coherent regional picture, with the dominance of humid conditions in Southern Hemisphere tropical band during Heinrich Stadials (HS) 5, 5a and 6 and other Stadials while dry conditions prevailed in the Northern tropics. This antiphased hydrological pattern between hemispheres has been attributed to ITCZ migration, which in turn might be associated with an eastward expansion of the SPCZ storm track, leading to an increased intensity of cyclogenic storms reaching Easter Island. Low Pacific Sea Surface Temperature (SST) gradients across the Equator were coincident with the here-defined Rano Aroi humid events and consistent with a reorganization of Southern Pacific atmospheric and oceanic circulation also at higher latitudes during Heinrich and Dansgaard–Oeschger stadials.

O. Margalef et al.
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Interactive discussion
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Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
O. Margalef et al.
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Short summary
The Rano Aroi peat record (Easter Island, 27ºS) is characterized by six major events of enhanced precipitation between 38 and 65 kyr BP coinciding with Heinrich and Dansgaard-Oeschger (DO) Stadials. These events draw a coherent regional picture involving atmospheric and oceanic reorganization. The singular location of Easter Island, filling a gap in an area where marine records are not available, contributes to understand the mechanisms behind these global rapid climatic excursions.
The Rano Aroi peat record (Easter Island, 27ºS) is characterized by six major events of...
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