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- W4367677316 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> During the Late Pleistocene, Dansgaard-Oeschger (DO) cycles triggered warming events that were as abrupt as the present-day human-induced warming. However, in absence of a periodic forcing operating on millennial time scales, the main energy sources of DO cycles remain debated. Here, we identify the energy sources of DO cycles by applying a bispectral analysis to the North Greenland ice core project (NGRIP) oxygen isotope (δ<sup>18</sup>O<sub>ice</sub>) record—a 123-thousand-years (kyr) long proxy-record of air-temperatures (T<sub>air</sub>) over Greenland. For both modes of DO cyclicity—slow and fast—we detect disparate energy sources. Slow-DO cycles are marked by multi-millennial periodicities in the 12.5 to 2.5 kyr bandwidth and receive energy from astronomical periodicities. Fast-DO cycles have millennial periodicities in the 1.5 ± 0.5 kyr range and receive energy from centennial periodicities. We propose cryospheric and oceanic mechanisms that facilitate the transfer of energy from known sources to slow- and fast-DO cycles, respectively. Our findings stress the importance of understanding energy-transfer mechanisms across a broad range of time scales to explain the origins of climate cycles without primary periodic energy-sources." @default.
- W4367677316 created "2023-05-03" @default.
- W4367677316 creator A5019122347 @default.
- W4367677316 date "2023-05-02" @default.
- W4367677316 modified "2023-09-30" @default.
- W4367677316 title "Reply on RC1" @default.
- W4367677316 doi "https://doi.org/10.5194/cp-2023-6-ac1" @default.
- W4367677316 hasPublicationYear "2023" @default.
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