New historical archeointensity data from Brazil: Evidence for a large regional non-dipole field contribution over the past few centuries

Detalhes bibliográficos
Autor(a) principal: Hartmann, Gelvam André
Data de Publicação: 2011
Outros Autores: Genevey, Agnès, Gallet, Yves, Trindade, Ricardo Ivan Ferreira da, Goff, Maxime Le, Najjar, Rosana, Etchevarne, Carlos Alberto, Afonso, Marisa Coutinho
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/5292
Resumo: Acesso restrito: Texto completo. p. 66-76.
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spelling Hartmann, Gelvam AndréGenevey, AgnèsGallet, YvesTrindade, Ricardo Ivan Ferreira daGoff, Maxime LeNajjar, RosanaEtchevarne, Carlos AlbertoAfonso, Marisa CoutinhoHartmann, Gelvam AndréGenevey, AgnèsGallet, YvesTrindade, Ricardo Ivan Ferreira daGoff, Maxime LeNajjar, RosanaEtchevarne, Carlos AlbertoAfonso, Marisa Coutinho2012-02-01T17:54:09Z2011-060012-821Xhttp://www.repositorio.ufba.br/ri/handle/ri/5292v. 306, n. 1-2.Acesso restrito: Texto completo. p. 66-76.We report new archeointensity data obtained from the analyses of baked clay elements (architectural and kiln brick fragments) sampled in Southeast Brazil and historically and/or archeologically dated between the end of the XVIth century and the beginning of the XXth century AD. The results were determined using the classical Thellier and Thellier protocol as modified by Coe, including partial thermoremanent magnetization (pTRM) and pTRM-tail checks, and the Triaxe protocol, which involves continuous high-temperature magnetization measurements. In both protocols, TRM anisotropy and cooling rate TRM dependence effects were taken into account for intensity determinations which were successfully performed for 150 specimens from 43 fragments, with a good agreement between intensity results obtained from the two procedures. Nine sitemean intensity values were derived from three to eight fragments and defined with standard deviations of less than 8%. The site-mean values vary from ~25 μT to ~42 μT and describe in Southeast Brazil a continuous decreasing trend by ~5 μT per century between ~1600 AD and ~1900 AD. Their comparison with recent archeointensity results obtained from Northeast Brazil and reduced at a same latitude shows that: (1) the geocentric axial dipole approximation is not valid between these southeastern and northeastern regions of Brazil, whose latitudes differ by ~10°, and (2) the available global geomagnetic field models (gufm1 models, their recalibrated versions and the CALSK3 models) are not sufficiently precise to reliably reproduce the nondipole field effects which prevailed in Brazil for at least the 1600–1750 period. The large non-dipole contribution thus highlighted is most probably linked to the evolution of the South Atlantic Magnetic Anomaly (SAMA) during that period. Furthermore, although our dataset is limited, the Brazilian archeointensity data appear to support the view of a rather oscillatory behavior of the axial dipole moment during the past three centuries that would have been marked in particular by a moderate increase between the end of the XVIIIth century and the middle of the XIXth century followed by the well-known decrease from 1840 AD attested by direct measurements.Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2012-02-01T17:54:08Z No. of bitstreams: 1 __pdn.sciencedirect.com_....0-S0012821X11001853-main.pdf: 901659 bytes, checksum: fc55be9d1e6b31d7f1fcb3310af198ab (MD5)Made available in DSpace on 2012-02-01T17:54:09Z (GMT). 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dc.title.pt_BR.fl_str_mv New historical archeointensity data from Brazil: Evidence for a large regional non-dipole field contribution over the past few centuries
dc.title.alternative.pt_BR.fl_str_mv Earth and Planetary Science Letters
title New historical archeointensity data from Brazil: Evidence for a large regional non-dipole field contribution over the past few centuries
spellingShingle New historical archeointensity data from Brazil: Evidence for a large regional non-dipole field contribution over the past few centuries
Hartmann, Gelvam André
archeomagnetism
archeointensity
geomagnetic secular variation
historical geomagnetic field
Southeast Brazil
South Atlantic Magnetic Anomaly
title_short New historical archeointensity data from Brazil: Evidence for a large regional non-dipole field contribution over the past few centuries
title_full New historical archeointensity data from Brazil: Evidence for a large regional non-dipole field contribution over the past few centuries
title_fullStr New historical archeointensity data from Brazil: Evidence for a large regional non-dipole field contribution over the past few centuries
title_full_unstemmed New historical archeointensity data from Brazil: Evidence for a large regional non-dipole field contribution over the past few centuries
title_sort New historical archeointensity data from Brazil: Evidence for a large regional non-dipole field contribution over the past few centuries
author Hartmann, Gelvam André
author_facet Hartmann, Gelvam André
Genevey, Agnès
Gallet, Yves
Trindade, Ricardo Ivan Ferreira da
Goff, Maxime Le
Najjar, Rosana
Etchevarne, Carlos Alberto
Afonso, Marisa Coutinho
author_role author
author2 Genevey, Agnès
Gallet, Yves
Trindade, Ricardo Ivan Ferreira da
Goff, Maxime Le
Najjar, Rosana
Etchevarne, Carlos Alberto
Afonso, Marisa Coutinho
author2_role author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Hartmann, Gelvam André
Genevey, Agnès
Gallet, Yves
Trindade, Ricardo Ivan Ferreira da
Goff, Maxime Le
Najjar, Rosana
Etchevarne, Carlos Alberto
Afonso, Marisa Coutinho
Hartmann, Gelvam André
Genevey, Agnès
Gallet, Yves
Trindade, Ricardo Ivan Ferreira da
Goff, Maxime Le
Najjar, Rosana
Etchevarne, Carlos Alberto
Afonso, Marisa Coutinho
dc.subject.por.fl_str_mv archeomagnetism
archeointensity
geomagnetic secular variation
historical geomagnetic field
Southeast Brazil
South Atlantic Magnetic Anomaly
topic archeomagnetism
archeointensity
geomagnetic secular variation
historical geomagnetic field
Southeast Brazil
South Atlantic Magnetic Anomaly
description Acesso restrito: Texto completo. p. 66-76.
publishDate 2011
dc.date.issued.fl_str_mv 2011-06
dc.date.accessioned.fl_str_mv 2012-02-01T17:54:09Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/5292
dc.identifier.issn.none.fl_str_mv 0012-821X
dc.identifier.number.pt_BR.fl_str_mv v. 306, n. 1-2.
identifier_str_mv 0012-821X
v. 306, n. 1-2.
url http://www.repositorio.ufba.br/ri/handle/ri/5292
dc.language.iso.fl_str_mv eng
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dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/j.epsl.2011.03.030
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