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El Niño–Southern Oscillation signal associated with middle Holocene climate change in intercorrelated terrestrial and marine sediment cores, North Island, New Zealand

¹ Geomorphology Laboratory, Indiana State University, Terre Haute, Indiana 47809, USA
² National Institute of Water and Atmospheric Research, P.O. Box 14901, Wellington, New Zealand
³ Institute of Geological and Nuclear Sciences, P.O. Box 30368, Lower Hutt, New Zealand
⁴ Institute of Natural Resources, Massey University, Private Bag 11 222, Palmerston North, New Zealand
⁵ Southampton Oceanography Centre, University of Southampton, Southampton SO14 3ZH, UK

A synchronous textural variation in intercorrelated, high-resolution sediment records from floodplain, continental-shelf, and continental-slope settings of the eastern North Island, New Zealand, provides evidence of increased storminess after ca. 4 ka. An upcore change in sediment texture reflects the transition to landsliding, which supplanted fluvial incision as the dominant mode of sediment production in the middle Holocene. This signal, which appears in all three records, indicates a regional response to external forcing and records the impact of an intensified atmospheric circulation marking the establishment of the contemporary climate that is strongly influenced by the El Niño–Southern Oscillation. The change in climate was a hemispheric event, and in the Southern Hemisphere its timing is confirmed by independent proxy records from elsewhere in New Zealand and the circum–South Pacific region.

Key Words: climate change • El Niño–Southern Oscillation • landsliding • New Zealand

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