Megasplice of benthic δ¹⁸O records over the last 35 Ma ...

Earth's climate has undergone different intervals of gradual change as well as abrupt shifts between climate states. Here we aim to characterize the corresponding changes in climate response to astronomical forcing in the icehouse portion of the Cenozoic, from the latest Eocene to the present....

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Bibliographic Details
Main Authors: De Vleeschouwer, David, Vahlenkamp, Maximilian, Crucifix, M, Pälike, Heiko
Format: Dataset
Language:English
Published: PANGAEA 2016
Subjects:
AGE
Foraminifera, benthic δ18O
Eccentricity
Longitude of the perihelion
Obliquity/tilt
e sin omega-tilde
e cos omega-tilde
δ18O, basin correction
Center for Marine Environmental Sciences MARUM
Antarc*
Antarctic
Ice Sheet
Online Access:https://dx.doi.org/10.1594/pangaea.869815
https://doi.pangaea.de/10.1594/PANGAEA.869815
Description
Summary:Earth's climate has undergone different intervals of gradual change as well as abrupt shifts between climate states. Here we aim to characterize the corresponding changes in climate response to astronomical forcing in the icehouse portion of the Cenozoic, from the latest Eocene to the present. As a tool, we use a 35-m.y.-long d18Obenthic record compiled from different high-resolution benthic isotope records spliced together (what we refer to as a megasplice).We analyze the climate response to astronomical forcing during four 800-k.y.- long time windows. During the mid-Miocene Climatic Optimum (ca. 15.5 Ma), global climate variability was mainly dependent on Southern Hemisphere summer insolation, ampli ed by a dynamic Antarctic ice sheet; 2.5 m.y. later, relatively warm global climate states occurred during maxima in both Southern Hemisphere and Northern Hemisphere summer insolation. At that point, the Antarctic ice sheet grew too big to pulse on the beat of precession, and the Southern Hemisphere lost its ... : We construct a 35 Myr-long d18Obenthic megasplice, a record that consists of different high-resolution benthic isotope records 'spliced' together. In contrast to existing compilations and stacks that respectively mix and average time-equivalent data across sites, the megasplice consists of data from a single site at any point in time, allowing analyses that require a high-resolution record at astronomical resolution.EarthSequencing (ERC Consolidator Grant to Heiko Pälike) (https://paloz.marum.de/confluence/display/ESPUBLIC). ...

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