2015
DOI: 10.1002/2014jb011828
|View full text |Cite
|
Sign up to set email alerts
|

New paleointensity results from rapidly cooled Icelandic lavas: Implications for Arctic geomagnetic field strength

Abstract: The Earth's magnetic field is assumed to be a geocentric axial dipole (GAD) when averaged over sufficient time (10 5 -10 6 years). Recent investigations of global paleosecular variation and time-averaged field behavior on million year timescales generally support a predominantly dipole field in the Northern Hemisphere, but unique field structures at high southern latitudes suggest the presence of a substantialḡ 0 2 quadrupolar component. Average paleointensity results from Antarctica are approximately half the… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1

Citation Types

2
54
0

Year Published

2016
2016
2018
2018

Publication Types

Select...
6

Relationship

2
4

Authors

Journals

citations
Cited by 33 publications
(56 citation statements)
references
References 124 publications
2
54
0
Order By: Relevance
“…If the time‐averaged geomagnetic field is well approximated by a GAD model (as strongly suggested by directional data, for example, Opdyke & Henry, ), then the paleointensity of the field should follow the relation of (1 + 3cos 2 θ m ) 1/2 (where θ m is colatitude), which is twice as strong at the poles than at the equator. However, the time‐averaged field calculated from published paleointensity data from either the past 0.78 Ma (Figure ) or 5 Ma (Cromwell, Tauxe, & Halldórsson, ; Lawrence et al, ) is poorly fit by a GAD model, with the paleointensities at midlatitudes similar to those at the poles.…”
Section: Introductionmentioning
confidence: 98%
“…If the time‐averaged geomagnetic field is well approximated by a GAD model (as strongly suggested by directional data, for example, Opdyke & Henry, ), then the paleointensity of the field should follow the relation of (1 + 3cos 2 θ m ) 1/2 (where θ m is colatitude), which is twice as strong at the poles than at the equator. However, the time‐averaged field calculated from published paleointensity data from either the past 0.78 Ma (Figure ) or 5 Ma (Cromwell, Tauxe, & Halldórsson, ; Lawrence et al, ) is poorly fit by a GAD model, with the paleointensities at midlatitudes similar to those at the poles.…”
Section: Introductionmentioning
confidence: 98%
“…;Hill & Shaw, 2000;Laj et al, 2002;Teanby et al, 2002;Chauvin et al, 2005;Gratton et al, 2005;Oishi et al, 2005;Pressling et al, 2006;Pressling et al, 2007;de Groot et al, 2013;Cromwell, Tauxe, & Halldorsson, 2015). These published…”
mentioning
confidence: 99%
“…In studies that compare intensity vs. latitude (e.g., Lawrence et al, 2009;Cromwell et al, 2015;Wang et al, 2015;Døssing et al, 2016), it is the geographical latitude, not the palaeomagnetic latitude, that is used; this removes the circular logic of using GAD theory to calculate the palaeomagnetic latitude in a study of the robustness of the GAD hypothesis. Only palaeointensity data from the last 5 Myr are usually considered, because, as a first-order approximation, this removes the need to include any tectonic corrections to the sample locations' geographic latitudes.…”
Section: A Simple Cap Model For Dipolar Secular Variationmentioning
confidence: 99%
“…However, in the last 20 years the palaeointensity database has changed significantly, with the inclusion of far more high-latitude data points. Additionally, the selection criteria for drawing samples from the database are far more stringent now than it was in the late 1990s (e.g., Lawrence et al, 2009;Cromwell et al, 2015;Wang et al, 2015;Døssing et al, 2016). As we will TABLE 1 | Parameters for secular variation models considered in this paper.…”
Section: A Giant Gaussian Processes (Ggp) Model Approach To Secular Vmentioning
confidence: 99%
See 1 more Smart Citation