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DOI | 10.1002/2017GL076007 |
New Archeomagnetic Directional Records From Iron Age Southern Africa (ca. 425-1550 CE) and Implications for the South Atlantic Anomaly | |
Hare, Vincent J.1; Tarduno, John A.1,2,3; Huffman, Thomas4; Watkeys, Michael3; Thebe, Phenyo C.5; Manyanga, Munyaradzi6; Bono, Richard K.1; Cottrell, Rory D.1 | |
2018-02-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:3页码:1361-1369 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; South Africa; Botswana; Zimbabwe |
英文摘要 | The paucity of Southern Hemisphere archeomagnetic data limits the resolution of paleosecular variation models. At the same time, important changes in the modern and historical field, including the recent dipole decay, appear to originate in this region. Here a new directional record from southern Africa is presented from analysis of Iron Age (ca. 425-1550 CE) archeological materials, which extends the regional secular variation curve back to the first millennium. Previous studies have identified a period of rapid directional change between 1225 and similar to 1550 CE. The new data allow us to identify an earlier period of relatively rapid change between the sixth and seventh centuries CE. Implications for models of recurrent flux expulsion at the core-mantle boundary are discussed. In addition, we identify a possible relationship of changes recorded in these African data with archeomagnetic jerks. Plain Language Summary Earth's dipole magnetic field is presently undergoing a rapid decay, best expressed by a deepening area of low field called the South Atlantic Anomaly (SAA). This apparent collapse of the geomagnetic field, and speculation about a future field reversal, has captured the public imagination. But we know little about the history of the SAA, limiting our ability to place current changes within a long-term context. Here we present a new magnetic record from sites of southern Africa. The new record supports our prior inferences that the SAA is just the most recent manifestation of a recurring phenomenon in the core beneath Africa-called flux expulsion-that is having a profound impact on the expression of the geomagnetic field. |
领域 | 气候变化 |
收录类别 | SCI-E ; SSCI |
WOS记录号 | WOS:000426161800020 |
WOS关键词 | EARTHS MAGNETIC-FIELD ; GEOMAGNETIC SECULAR VARIATION ; MILLENNIA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27384 |
专题 | 气候变化 |
作者单位 | 1.Univ Rochester, Dept Earth & Environm Sci, Rochester, NY 14627 USA; 2.Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA; 3.Univ KwaZulu Natal, Sch Geol Sci, Durban, South Africa; 4.Univ Witwatersrand, Sch Geog Archaeol & Environm Studies, Johannesburg, South Africa; 5.Univ Botswana, Dept Hist, Archaeol Unit, Gaborone, Botswana; 6.Univ Zimbabwe, Hist Dept, Harare, Zimbabwe |
推荐引用方式 GB/T 7714 | Hare, Vincent J.,Tarduno, John A.,Huffman, Thomas,et al. New Archeomagnetic Directional Records From Iron Age Southern Africa (ca. 425-1550 CE) and Implications for the South Atlantic Anomaly[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(3):1361-1369. |
APA | Hare, Vincent J..,Tarduno, John A..,Huffman, Thomas.,Watkeys, Michael.,Thebe, Phenyo C..,...&Cottrell, Rory D..(2018).New Archeomagnetic Directional Records From Iron Age Southern Africa (ca. 425-1550 CE) and Implications for the South Atlantic Anomaly.GEOPHYSICAL RESEARCH LETTERS,45(3),1361-1369. |
MLA | Hare, Vincent J.,et al."New Archeomagnetic Directional Records From Iron Age Southern Africa (ca. 425-1550 CE) and Implications for the South Atlantic Anomaly".GEOPHYSICAL RESEARCH LETTERS 45.3(2018):1361-1369. |
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