HR: 17:30h
AN: GP24A-07    [Abstracts]
TI: Does Secular Variation of the Earth's Magnetic Field Control Centennial Climate Change?
AU: Genevey, A
EM: agnes.genevey@culture.gouv.fr
AF: Centre de Recherche et de Restauration des Musees de France, Palais du Louvre, porte des Lions, 14 quai Francois Mitterrand, Paris, 75001 France
AU: Gallet, Y
EM: gallet@ipgp.jussieu.fr
AF: Laboratoire de Paleomagnetisme, Institut de Physique du Globe de Paris, 4 Place Jussieu, Paris, 75005 France
AU: Fluteau, F
EM: fluteau@ipgp.jussieu.fr
AF: Laboratoire de Paleomagnetisme, Institut de Physique du Globe de Paris, 4 Place Jussieu, Paris, 75005 France
AU: * Courtillot, V
EM: courtil@ipgp.jussieu.fr
AF: Laboratoire de Paleomagnetisme, Institut de Physique du Globe de Paris, 4 Place Jussieu, Paris, 75005 France
AB: A large collection of directional and intensity data from Western Europe describes the secular variation of the Earth's magnetic field over the past few millennia. Using this dataset, we found a remarkable coincidence between sharp cusps in geomagnetic field direction and the appearance of intensity maxima, which may constitute a robust characteristic of geomagnetic secular variation occurring over time scales of less than a century (Gallet et al., 2003). More recently, we emphasized the fact that the rising parts of intensity peaks coincide in time with the occurrence of cooling events, such as the Little Ice Age, documented in Western Europe from natural and historical data (Gallet et al., 2005). This correlation suggests a connection between enhanced secular variation of the geomagnetic field and climate change over decadal to centennial time scales. Mechanisms that could involve the geomagnetic field as a cause of these climatic variations should therefore be sought. Y. Gallet, A. Genevey, V. Courtillot, On the possible occurrence of archeomagnetic jerks in the geomagnetic field over the past three millennia, Earth Planet. Sci. Lett. 214 (2003) 237-242. Y. Gallet, A. Genevey, F. Fluteau, Does Earth's magnetic field secular variation control centennial climate change ? Earth Planet. Sci. Lett. 236 (2005) 339-347.
DE: 1503 Archeomagnetism
DE: 1521 Paleointensity
DE: 1522 Paleomagnetic secular variation
DE: 1605 Abrupt/rapid climate change (4901, 8408)
DE: 9335 Europe
SC: Geomagnetism and Paleomagnetism [GP]
MN: Fall Meeting 2005