Total Solar Irradiance during the past 9300 Years inferred from the Cosmogenic Radionuclide Beryllium-10

Details Total Solar Irradiance during the past 9300 Years inferred from the Cosmogenic Radionuclide Beryllium-10 Total Solar Irradiance during the past 9300 Years inferred from the Cosmogenic Radionuclide Beryllium-10

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmgc24a..03s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #GC24A-03

Astronomy and Astrophysics

Astrophysics

[1650] Global Change / Solar Variability, [2104] Interplanetary Physics / Cosmic Rays, [3344] Atmospheric Processes / Paleoclimatology, [7538] Solar Physics, Astrophysics, And Astronomy / Solar Irradiance

Scientific paper

The Sun is the main source of energy for the Earth. There is growing evidence that climate changes in the past coincide with changes in solar activity. This raises the question about the Sun’s role in past, present, and future global change. To answer this question, the total solar irradiance (TSI) has to be known not only for the present period of high solar activity, but also for periods when the Sun was very quiet, such as the Maunder Minimum (1645-1715). Direct instrumental data of TSI goes only back to 1978. We present the first reconstruction of TSI covering the past 9300 years. It is based on a recently derived relationship between observed TSI and the open solar magnetic field. The open solar magnetic field can be obtained from the cosmogenic radionuclide Beryllium-10 measured in ice cores. Thus, Beryllium-10 allows reconstructing TSI much further back than the existing record of sunspots, which is often used as a proxy. The resulting increase in the average TSI from the Maunder Minimum to the present amounts to (0.9±0.4)Wm-2 corresponding to a global radiative forcing of (0.16±0.07)Wm-2. This change is smaller than previous TSI reconstructions commonly used in climate studies. In combination with climate models, our reconstruction offers the possibility to quantitatively test the claimed links between solar forcing and climate change.

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