| DOI: | 10.1002/2015GL064067
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| 论文题名: | Fast equatorial waves propagating at the top of the Earth's core |
| 作者: | Chulliat A.; Alken P.; Maus S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9452
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| EISSN: | 1944-9183
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| 出版年: | 2015
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| 卷: | 42, 期:9 | | 起始页码: | 3321
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| 结束页码: | 3329
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| 语种: | 英语
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| 英文关键词: | Earth's core
; geomagnetic jerks
; Rossby waves
; secular variation
; Swarm
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| Scopus关键词: | Geomagnetism
; Magnetism
; Surface waves
; Earth's core
; Geomagnetic jerks
; Rossby wave
; Secular variation
; Swarm
; Mechanical waves
; acceleration
; core (planetary)
; Earth
; geomagnetic field
; Rossby wave
; symmetry
; wave modeling
; wave propagation
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| 英文摘要: | Since 2000, magnetic field variations originating in the core have been dominated by several pulses in the secular acceleration, leading to sharp geomagnetic "jerks" at the Earth's surface. Using models built from (i) Defense Meteorological Satellite Program data and (ii) Ørsted and Swarm satellites and ground observatory data, we show that a new pulse occurred in 2012.5, immediately following two pulses in 2006 and 2009. The three pulses can be decomposed into several equatorially symmetric modes propagating eastward and westward at 550 to 1100km/yr, and one equatorially antisymmetric mode propagating eastward at 1650km/yr. The characteristics of these modes are compatible to some extent with equatorial magnetic Rossby waves propagating within a 140km thick layer at the top of the core with a density contrast of 50ppm. This interpretation, if confirmed, would provide a new explanation for geomagnetic jerks and pulses based on stable stratification of the core. Key Points A new secular acceleration pulse occurred in 2012.5 Recent pulses are decomposed in fast equatorial waves at the core surface Waves have characteristics of magnetic Rossby waves in a stratified layer ©2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930449753&doi=10.1002%2f2015GL064067&partnerID=40&md5=91822cccd0d6f7d6f12139028a11411f
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/9067
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States
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| Recommended Citation: | |
Chulliat A.,Alken P.,Maus S.. Fast equatorial waves propagating at the top of the Earth's core[J]. Geophysical Research Letters,2015-01-01,42(9).
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