Resolving climate change in the period 15–23 ka in Greenland ice cores: a new application of spectral trend analysis |
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| Authors: | Mat G G De Jong Djin S Nio Alain R Böhm Harry C Seijmonsbergen Leo W S de Graaff |
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| Institution: | ENRES International, Ruysdaellaan 3, 3712 AP, Huis ter Heide, The Netherlands;;Research Foundation for Alpine and Subalpine Environments (RFASE), Buiksloterbreek 14, 1034 XC Amsterdam, The Netherlands;;Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands |
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| Abstract: | Northern Hemisphere climate history through and following the Last Glacial Maximum is recorded in detail in ice cores from Greenland. However, the period between Greenland Interstadials 1 and 2 (15–23 ka), i.e. the period of deglaciation following the last major glaciation, has been difficult to resolve in great detail. We here offer a new subdivision of this in the NGRIP, GRIP and GISP2 ice cores, by newly introducing spectral trend analysis to the study of climate-related data series from ice cores. This analysis reveals patterns of change and discontinuity in the waveform properties of a data series, relating to the environmental (including climatic) history of accumulation of the rock or ice record. The application allows high-resolution correlation between the ice cores, and a greatly improved subdivision of the study interval. Nine climatic phases are recognized, within which more identifiable events can also be correlated between the three locations. |
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