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Modern solar maximum forced late twentieth century Greenland cooling
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2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 42, no 14, 5992-5999 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 42, no 14, 5992-5999 p.
Keyword [en]
Greenland temperature Atlantic meridional overturning circulation subpolar North Atlantic ice core paleoclimate climate-change temperature variability overturning circulation northern-hemisphere ice reconstruction irradiance radiation slowdown yr Geology
Research subject
SWEDARCTIC 2004, NordGRIP 2004
Identifiers
URN: urn:nbn:se:polar:diva-2156DOI: 10.1002/2015gl064764OAI: oai:DiVA.org:polar-2156DiVA: diva2:851695
Funder
Swedish Polar Research Secretariat
Note

ISI Document Delivery No.: CO7CU Times Cited: 0 Cited Reference Count: 36 Kobashi, T. Box, J. E. Vinther, B. M. Goto-Azuma, K. Blunier, T. White, J. W. C. Nakaegawa, T. Andresen, C. S. KAKENHI [23710020, 25740007, 22221002]; EU Marie Curie Fellowship; NIPR publication subsidy; Denmark (SNF/FNU); Belgium (FNRS-CFB); France (IFRTP and INSU/CNRS); Germany (AWI); Iceland (RannIs); Japan (MEXT); Sweden (SPRS); Switzerland (SNF); United States of America (NSF) This project was supported by KAKENHI (23710020, 25740007, and 22221002) and the EU Marie Curie Fellowship for T.K. The production of this paper was supported by an NIPR publication subsidy. This paper is dedicated to Thomas J. Crowley (1948-2014), who made substantial contributions to the field of paleoclimatology. We thank T. Stocker, H. Wanner, A. Born, S. Muthers, M. Doring, A. Jeltsch-Thommes, H. Fischer, M. Leuenberger, and A. Ohmura for their comments and discussions. We also thank S. Hakkinen, R. Alley, J. Schwander, C. Buizert, A. Muto for the data, and K. Kawamura for hosting the experiments. We are also grateful to Sepp Kipfstuhl for the help in preparing the NGRIP ice samples. This paper was substantially improved by two anonymous reviews. T.K. conceived the project, conducted the analyses, and wrote the paper. J.B. and K.G.-A. contributed to the temperature reconstructions. B.M.V., T.B., and J.W. supported the interpretation of ice cores. T.N. and C.S.A. contributed on the climate data interpretations. All authors discussed the results, commented, and edited on the manuscript. This work is a contribution to the NorthGRIP ice core project, which is directed and organized by the Centre for Ice and Climate at the Niels Bohr Institute, University of Copenhagen. It is being supported by funding agencies in Denmark (SNF/FNU), Belgium (FNRS-CFB), France (IFRTP and INSU/CNRS), Germany (AWI), Iceland (RannIs), Japan (MEXT), Sweden (SPRS), Switzerland (SNF) and the United States of America (NSF). 0 Amer geophysical union Washington 1944-8007

Available from: 2015-09-07 Created: 2015-09-07 Last updated: 2015-09-07Bibliographically approved

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