δ18O and Model data for enhanced Greenland surface-temperature variability during the Last Glacial Maximum ...

Stable oxygen isotope records from central Greenland suggest disproportionally large long-term surface-air temperature (SAT) variability during the last glacial maximum (LGM) relative to preindustrial times. Large perturbations in mean atmospheric circulation and its variability forced by extensive...

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Bibliographic Details
Main Authors: Song, Zhaoyang, Latif, Mojib, Park, Wonsun, Zhang, Yuming
Format: Dataset
Language:English
Published: PANGAEA 2020
Subjects:
LGM
Description
Binary Object
Binary Object File Size
Binary Object Media Type
Paleo Modelling PalMod
Greenland
Pacific
Ice Sheet
Online Access:https://dx.doi.org/10.1594/pangaea.922864
https://doi.pangaea.de/10.1594/PANGAEA.922864
Description
Summary:Stable oxygen isotope records from central Greenland suggest disproportionally large long-term surface-air temperature (SAT) variability during the last glacial maximum (LGM) relative to preindustrial times. Large perturbations in mean atmospheric circulation and its variability forced by extensive Northern Hemisphere ice sheet coverage has been suggested as cause for the enhanced Greenland SAT variability. Here, we assess the factors driving Greenland SAT variability during the LGM by means of dedicated climate model simulations and find remote forcing from the Pacific of critical importance. Atmospheric teleconnections from the Interdecadal Pacific Oscillation (IPO), a multidecadal oscillation of sea-surface temperature in the Pacific Ocean, strongly intensify under LGM conditions, driving enhanced surface wind variability over Greenland, which in turn amplifies SAT variability by anomalous atmospheric heat transport. A major role of the IPO in forcing Greenland SAT variability also is supported by a ...

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