Refining geomagnetic field intensity changes in Europe between 200 CE and 1800 CE. New data from the Mediterranean region
| Autor: | Fátima Martín-Hernández, M.A. Cau-Ontiveros, Francisco Javier Pavón-Carrasco, J. Ramon-Torres, A. Palencia-Ortas, M. Rivero-Montero, Despina Kondopoulou, Evdokia Tema, Elina Aidona, Leandro Fantuzzi, C. Mas-Florit, Miriam Gómez-Paccard |
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| Rok vydání: | 2021 |
| Předmět: |
Mediterranean climate
Paleomagnetism 010504 meteorology & atmospheric sciences Physics and Astronomy (miscellaneous) Thermoremanent magnetization Mediterranean Arqueologia 010502 geochemistry & geophysics 01 natural sciences Archaeometry Archeomagnetism Archeointensity Geomagnetic field strength maxima Paleomagnetism Mediterranean 0105 earth and related environmental sciences geography geography.geographical_feature_category Física atmosférica Astronomy and Astrophysics Geodesy Volcanic rock Arqueometria Geophysics Earth's magnetic field Cooling rate Geomagnetic field strength maxima Archaeology Space and Planetary Science Archeomagnetism Period (geology) Maxima Archeointensity Intensity (heat transfer) Geology |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona E-Prints Complutense. Archivo Institucional de la UCM instname |
| Popis: | Absolute past geomagnetic intensity values can mainly be recovered by fired archaeological materials and volcanic rocks. Here, we present 10 new archeointensities from the Mediterranean region that help to better constrain geomagnetic field intensity changes in Europe over the last two millennia. The new archeointensity results were obtained from the Thellier classical method including thermoremanent magnetization (pTRM) checks and both the TRM anisotropy and cooling rate corrections and were derived from at least three specimens. The new data presented, together with a selection of previous archeointensities satisfying a set of quality criteria, confirm the presence of several intensity maxima in Europe over the last 2000 years. In particular, the new archeointensities allow to better define the starting point of the double-oscillation feature that occurred in Europe during the second half of the first millennium CE, and reinforce the existence of a relative maximum at the end of the 14th century - beginning of the 15th century in Western Europe. From selected European archeointensities two new paleosecular variation curves are constructed for Western and Eastern Europe using temporal cubic b-splines in a bootstrap approach. The obtained curves suggest that the occurrence of the intensity maxima is characterized by a period of about 300 ± 50 years. In addition, our results suggest that the maxima do not occur simultaneously in Western and Eastern Europe, pointing out an intensity eastward drift with a mean lag-time of about 100 years. |
| Databáze: | OpenAIRE |
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