Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1809197115 |
Speleothem record of geomagnetic South Atlantic Anomaly recurrence | |
Trindade, Ricardo I. F.1; Jaqueto, Plinio1; Terra-Nova, Filipe1,2; Brandt, Daniele1; Hartmann, Gelvam A.3; Feinberg, Joshua M.4; Strauss, Becky E.5; Novello, Valdir F.6; Cruz, Francisco W.6; Karmann, Ivo6; Cheng, Hai7,8; Edwards, R. Lawrence7 | |
2018-12-26 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:52页码:13198-13203 |
文章类型 | Article |
语种 | 英语 |
国家 | Brazil; France; USA; Peoples R China |
英文摘要 | The diminishing strength of the Earth's magnetic dipole over recent millennia is accompanied by the increasing prominence of the geomagnetic South Atlantic Anomaly (SAA), which spreads over the South Atlantic Ocean and South America. The longevity of this feature at millennial timescales is elusive because of the scarcity of continuous geomagnetic data for the region. Here, we report a unique geomagnetic record for the last similar to 1500 y that combines the data of two well-dated stalagmites from Pau d'Alho cave, located close to the present-day minimum of the anomaly in central South America. Magnetic directions and relative paleointensity data for both stalagmites are generally consistent and agree with historical data from the last 500 y. Before 1500 CE, the data adhere to the geomagnetic model ARCH3K. 1, which is derived solely from archeomagnetic data. Our observations indicate rapid directional variations (> 0.1 degrees/y) from approximately 860 to 960 CE and approximately 1450 to 1750 CE. A similar pattern of rapid directional variation observed from South Africa precedes the South American record by 224 +/- 50 y. These results confirm that fast geomagnetic field variations linked to the SAA are a recurrent feature in the region. We develop synthetic models of reversed magnetic flux patches at the core-mantle boundary and calculate their expression at the Earth's surface. The models that qualitatively resemble the observational data involve westward (and southward) migration of midlatitude patches, combined with their expansion and intensification. |
英文关键词 | archeomagnetism South Atlantic Anomaly speleothem geomagnetism paleomagnetism |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000454302600055 |
WOS关键词 | EARTHS MAGNETIC-FIELD ; SECULAR VARIATION ; AGE ; PALEOINTENSITY ; REMANENCE ; SEDIMENTS ; MINERALS ; MODEL |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
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/205035 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo, Brazil; 2.Univ Nantes, Lab Planetol & Geodynam, F-44000 Nantes, France; 3.Univ Estadual Campinas, Inst Geociencias, BR-13083870 Campinas, SP, Brazil; 4.Univ Minnesota, Inst Rock Magnetism, Minneapolis, MN 55455 USA; 5.NIST, Mat Measurement Lab, Mat Sci & Engn Div, Gaithersburg, MD 20899 USA; 6.Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo, Brazil; 7.Univ Minnesota, Dept Earth Sci, Minneapolis, MN 55455 USA; 8.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Shaanxi, Peoples R China |
推荐引用方式 GB/T 7714 | Trindade, Ricardo I. F.,Jaqueto, Plinio,Terra-Nova, Filipe,et al. Speleothem record of geomagnetic South Atlantic Anomaly recurrence[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(52):13198-13203. |
APA | Trindade, Ricardo I. F..,Jaqueto, Plinio.,Terra-Nova, Filipe.,Brandt, Daniele.,Hartmann, Gelvam A..,...&Edwards, R. Lawrence.(2018).Speleothem record of geomagnetic South Atlantic Anomaly recurrence.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(52),13198-13203. |
MLA | Trindade, Ricardo I. F.,et al."Speleothem record of geomagnetic South Atlantic Anomaly recurrence".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.52(2018):13198-13203. |
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