Interdecadal Pacific Oscillation Drives Enhanced Greenland Surface Temperature Variability During the Last Glacial Maximum.

Song, Zhaoyang , Latif, Mojib , Park, Wonsun and Zhang, Yuming (2020) Interdecadal Pacific Oscillation Drives Enhanced Greenland Surface Temperature Variability During the Last Glacial Maximum. Geophysical Research Letters, 47 (23). Art.Nr. e2020GL088922. DOI 10.1029/2020GL088922.

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Abstract

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 have 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 number of models from the Paleoclimate Modeling Intercomparison Project Phase III

Document Type: Article
Dewey Decimal Classification: 500 Natural Sciences and Mathematics > 550 Earth sciences & geology
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2020GL088922
ISSN: 0094-8276
Related URLs:
Projects: PalMod, KCM
Expeditions/Models/Experiments:
Date Deposited: 09 Dec 2020 09:33
Last Modified: 08 Mar 2021 09:45
URI: http://oceanrep.geomar.de/id/eprint/51271

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