DOI: 10.1002/grl.50762
论文题名: The cooling-rate effect on microwave archeointensity estimates
作者: Poletti W. ; Hartmann G.A. ; Hill M.J. ; Biggin A.J. ; Trindade R.I.F.
刊名: Geophysical Research Letters
ISSN: 0094-8729
EISSN: 1944-8460
出版年: 2013
卷: 40, 期: 15 起始页码: 3847
结束页码: 3852
语种: 英语
英文关键词: Archeomagnetism
; cooling-rate correction
; microwave
; paleointensity methods
Scopus关键词: Archeointensity
; Archeomagnetism
; Cooling rates
; Northeast Brazil
; Pacific islands
; Paleointensity
; Paleointensity data
; Theoretical approach
; Estimation
; Microwaves
; Cooling
; cooling
; data acquisition
; estimation method
; paleoclimate
; Brazil
; Pacific islands
; Pacific Ocean
英文摘要: New microwave (MW) paleointensity data on historical bricks from Northeast Brazil presented a bias toward higher fields when compared to previous cooling-rate corrected double-heating paleointensity estimates; the same relates to the previously reported values for pottery from Southwestern Pacific islands. A simple theoretical approach suggests that the MW bias in both collections is due to a cooling-rate effect on MW estimates. We then experimentally corrected the MW cooling-rate effect on Brazilian fragments, increasing the degree of consistency between the previous and new results (reducing discrepancies from 25% to 8%). Results indicate similar experimental behavior between microwave and thermal procedures despite the different ways in which the energy is transferred into the spin system. Finally, they allow cooling times of less than 90 s to be empirically estimated in most of these MW experiments highlighting the need for systematic cooling-rate corrections to be applied in similar MW paleointensity studies in the future. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880862913&doi=10.1002%2fgrl.50762&partnerID=40&md5=585b81b03aa173287c363f5a906f4fb4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5993
Appears in Collections: 气候减缓与适应
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作者单位: Departamento de Geofísica, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de Sao Paulo, Rua do Matao, São Paulo 05508-090, Brazil
Recommended Citation:
Poletti W.,Hartmann G.A.,Hill M.J.,et al. The cooling-rate effect on microwave archeointensity estimates[J]. Geophysical Research Letters,2013-01-01,40(15).