Climate of the Past Discussions www.clim-past-discuss.net 1814-9340 1814-9359 5 1 2009 10.5194/cpd-5-287-2009 http://www.clim-past-discuss.net/5/287/2009/ http://www.clim-past-discuss.net/5/287/2009/cpd-5-287-2009.html http://www.clim-past-discuss.net/5/287/2009/cpd-5-287-2009.pdf 287 326 2009-01-28 Mid-Holocene regional reorganization of climate variability K. W. Wirtz wirtz@gkss.de K. Bernhardt G. Lohmann C. Lemmen GKSS Research Center Geesthacht, Institute for Coastal Research, Max-Planck Straße 1, 21501 Geesthacht, Germany Carl-von-Ossietzky Universität Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl-von-Ossietzky Straße, 26111 Oldenburg, Germany Alfred Wegener Institute for Polar and Marine Research, P.O. Box 180, 27483 Bremerhaven, Germany We integrate 130 globally distributed proxy time series to refine the understanding of climate variability during the Holocene. Cyclic anomalies and temporal trends in periodicity from the Lower to the Upper Holocene are extracted by combining Lomb-Scargle Fourier-transformed spectra with bootstrapping. Results were cross-checked by counting events in the time series. Main outcomes are: First, the propensity of the climate system to fluctuations is a region specific property. Many records of adjacent sites reveal a similar change in variability although they belong to different proxy types (e.g., δ¹⁸O, lithic composition). Secondly, at most sites, irreversible change occured in the Mid-Holocene. We suggest that altered ocean circulation together with slightly modified coupling intensity between regional climate subsystems around the 5.5 kyr BP event (termination of the African Humid Period) were responsible for the shift. Fluctuations especially intensified along a pan-American corridor. This may have led to an unequal crisis probability for early human civilizations in the Old and New World. 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