Modern solar maximum forced late twentieth century Greenland cooling

The abrupt Northern Hemispheric warming at the end of the twentieth century has been attributed to an enhanced greenhouse effect. Yet Greenland and surrounding subpolar North Atlantic remained anomalously cold in 1970s to early 1990s. Here we reconstructed robust Greenland temperature records (North...

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Bibliographic Details
Main Authors: Nakaegawa, T., Box, J. E., Andresen, C. S., Kobashi, T., Goto-Azuma, K., White, J. W. C., Blunier, T., Vinther, B. M.
Format: Text
Language:English
Published: American Geophysical Union 2015
Subjects:
530 Physics
Greenland
Greenland ice core
Greenland Ice core Project
Greenland Ice Sheet Project
ice core
Ice Sheet
North Atlantic
North Greenland
North Greenland Ice Core Project
Online Access:https://dx.doi.org/10.7892/boris.71553
http://boris.unibe.ch/71553/
Description
Summary:The abrupt Northern Hemispheric warming at the end of the twentieth century has been attributed to an enhanced greenhouse effect. Yet Greenland and surrounding subpolar North Atlantic remained anomalously cold in 1970s to early 1990s. Here we reconstructed robust Greenland temperature records (North Greenland Ice Core Project and Greenland Ice Sheet Project 2) over the past 2100 years using argon and nitrogen isotopes in air trapped within ice cores and show that this cold anomaly was part of a recursive pattern of antiphase Greenland temperature responses to solar variability with a possible multidecadal lag. We hypothesize that high solar activity during the modern solar maximum (approximately 1950s–1980s) resulted in a cooling over Greenland and surrounding subpolar North Atlantic through the slowdown of Atlantic Meridional Overturning Circulation with atmospheric feedback processes.

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