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Original Research Papers

Solar irradiance during the last 1200 years based on cosmogenic nuclides

Authors:

Edouard Bard ,

CEREGE, Université d’Aix-Marseille, FR
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Grant Raisbeck,

Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, FR
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Françoise Yiou,

Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, FR
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Jean Jouzel

Laboratoire des Sciences du Climat et de l’Environnement, FR
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Abstract

Based on a quantitative study of the common fluctuations of 14C and 10Be production rates, we have derived a time series of the solar magnetic variability over the last 1200 years. This record is converted into irradiance variations by linear scaling based on previous studies of sun-like stars and of the sun’s behavior over the last few centuries. The new solar irradiance record exhibits low values during the well-known solar minima centered at about 1900, 1810 (Dalton) and 1690 ad(Maunder). Further back in time, a rather long period between 1450 and 1750 ad is characterized by low irradiance values. A shorter period is centered at about 1200 ad, with irradiance slightly higher or similar to present day values. It is tempting to correlate these periods with the so-called “little ice age” and “medieval warm period” respectively An accurate quantification of the climatic impact of this new irradiance record requires the use of coupled atmosphere−ocean general circulation models (GCMs). Nevertheless, our record is already compatible with a global cooling of about 0.5-1°C during the “little ice age”, and with a general cooling trend during the past millenium followed by global warming during the 20th century (Mann et al., 1999).

How to Cite: Bard, E., Raisbeck, G., Yiou, F. and Jouzel, J., 2000. Solar irradiance during the last 1200 years based on cosmogenic nuclides. Tellus B: Chemical and Physical Meteorology, 52(3), pp.985–992. DOI: http://doi.org/10.3402/tellusb.v52i3.17080
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  Published on 01 Jan 2000
 Accepted on 16 Sep 1999            Submitted on 12 Apr 1999

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