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Title:
Evidence for a link between the flux of galactic cosmic rays and Earth's climate during the past 200,000 years
Authors:
Christl, M.; Mangini, A.; Holzkämper, S.; Spötl, C.
Affiliation:
AA(Heidelberger Akademie der Wissenschaften, c/o Institut für Umweltphysik, Universität Heidelberg, Im Neuenheimer Feld 229, Heidelberg D-69120, Germany; ), AB(Heidelberger Akademie der Wissenschaften, c/o Institut für Umweltphysik, Universität Heidelberg, Im Neuenheimer Feld 229, Heidelberg D-69120, Germany), AC(Heidelberger Akademie der Wissenschaften, c/o Institut für Umweltphysik, Universität Heidelberg, Im Neuenheimer Feld 229, Heidelberg D-69120, Germany), AD(Institut für Geologie und Paläontologie, Universität Innsbruck, Innrain 52, Innsbruck A-6020, Austria)
Publication:
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 3-4, p. 313-322.
Publication Date:
02/2004
Origin:
ELSEVIER
Keywords:
Cosmic rays, Causality problem, Magnetic field, Speleothems, Orbital forcing, Paleoclimate
DOI:
10.1016/j.jastp.2003.12.004
Bibliographic Code:
2004JASTP..66..313C

Abstract

The possibility that galactic cosmic rays (GCR) influence the Earth's cloud cover and therefore have an important impact on the Earth's radiative climate forcing has become a leading candidate to explain the observed sun-climate connection. A correlation between GCR and low cloud cover has been ascertained in models and observations over the past few years. The deposition of cosmogenic radionuclides in ice cores and deep sea sediments can be used as a proxy for the past GCR-flux and provides an important tool to study the supposed GCR-climate connection on glacial-interglacial timescales. In this study, a record of geomagnetic paleointensity based on 10Be from deep sea sediments is used as proxy for GCR-flux over the past 200,000 years. It is compared with climate records from marine, terrestrial and ice core archives. Our results are consistent with the GCR-climate theory and suggest the existence of a GCR-climate connection over the past 200,000 years.
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