High paleointensities for the Canary Islands constrain the Levant geomagnetic high

Groot, Lennart de; Béguin, Annemarieke; Kosters, Martha E.; Rijsingen, Elenora van; Struijk, Erzsébet L.M.; Biggin, Andrew J.; Hurst, Elliot; Langereis, C.G.; Dekkers, Mark J.

doi:10.1016/j.epsl.2015.03.020

Cited by 52 publications

(78 citation statements)

References 68 publications

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“…Here we used the GEOMAGIA50.v3 database (Donadini et al 2006;Korhonen et al 2008;Brown et al 2015) to which we added recent archeo-and paleointensity results (Cai et al 2014(Cai et al , 2015Cromwell et al 2015;de Groot et al 2015;Di Chiara et al 2014;Gallet et al 2008Gallet et al , 2009Gallet & Al Maqdissi 2010;Hong et al 2013;Kapper et al 2015;Kissel et al 2015;Osete et al 2015;Shaar et al 2015;Stillinger et al 2015). Concerning the data compiled in this version of GEOMAGIA, the Mesopotamian data from Nachasova & Burakov (1995 were modified according to .…”

Section: Appendix A: Gmag9k Axial Dipole Evolutionmentioning

confidence: 99%

Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxima

Usoskin

Gallet

Lopes

et al. 2016

A&A

136

183

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Aims. Cosmogenic isotopes provide the only quantitative proxy for analyzing the long-term solar variability over a centennial timescale. While essential progress has been achieved in both measurements and modeling of the cosmogenic proxy, uncertainties still remain in the determination of the geomagnetic dipole moment evolution. Here we aim at improving the reconstruction of solar activity over the past nine millennia using a multi-proxy approach. Methods. We used records of the 14 C and 10 Be cosmogenic isotopes, current numerical models of the isotope production and transport in Earth's atmosphere, and available geomagnetic field reconstructions, including a new reconstruction relying on an updated archeo-and paleointensity database. The obtained series were analyzed using the singular spectrum analysis (SSA) method to study the millennial-scale trends. Results. A new reconstruction of the geomagnetic dipole field moment, referred to as GMAG.9k, is built for the last nine millennia. New reconstructions of solar activity covering the last nine millennia, quantified in terms of sunspot numbers, are presented and analyzed. A conservative list of grand minima and maxima is also provided. Conclusions. The primary components of the reconstructed solar activity, as determined using the SSA method, are different for the series that are based on 14 C and 10 Be. This shows that these primary components can only be ascribed to long-term changes in the terrestrial system and not to the Sun. These components have therefore been removed from the reconstructed series. In contrast, the secondary SSA components of the reconstructed solar activity are found to be dominated by a common ≈2400-year quasi-periodicity, the so-called Hallstatt cycle, in both the 14 C and 10 Be based series. This Hallstatt cycle thus appears to be related to solar activity. Finally, we show that the grand minima and maxima occurred intermittently over the studied period, with clustering near lows and highs of the Hallstatt cycle, respectively.

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Section: Appendix A: Gmag9k Axial Dipole Evolutionmentioning

confidence: 99%

Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxima

Usoskin

Gallet

Lopes

et al. 2016

A&A

136

183

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“…The "spikes" are the extreme climax of a high field maximum (>160 ZAm 2 ) in the Levant that appears in close approximation to other unusually high paleointensity values seen in Turkey (Ertepinar et al, 2012) and Georgia (Shaar et al., 2013), and to other local maxima with lower values seen, for example, in France (Herve et al, 2013), and SE Asia (Hong et al, 2013). Thus, at least at a continental scale, the high-field episode is likely associated with a complicated field structure Kovacheva et al, 2009;Tema and Kondopoulou, 2011;Tema et al, 2012;Kovacheva et al, 2014), suggesting a complex global deviation from a simple dipole configuration (de Groot et al, 2013(de Groot et al, , 2015 that calls for further investigation.…”

Section: Introductionmentioning

confidence: 99%

“…Also, it is of particular interest to investigate whether the Levant high field episode is a local anomaly (e.g. de Groot et al, 2015) or a global dipole feature (e.g. Hong et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Large geomagnetic field anomalies revealed in Bronze to Iron Age archeomagnetic data from Tel Megiddo and Tel Hazor, Israel

Shaar

Tauxe

Ron

et al. 2016

Earth and Planetary Science Letters

170

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“…We considered literature palaeointensity data from these regions that is the mean of at least three independent (mostly Thellier) measurements. Data that originates from Spain (Catanzariti et al 2012;Gómez-Paccard et al 2012, 2013a, 2008, Portugal (Hartmann et al 2009;Nachasova & Burakov 2009), the Canary Islands (Ferk et al 2011;de Groot et al 2015) and West-Africa (Gómez-Paccard et al 2012b;Mitra et al 2013) fulfil this criterion (Fig. 7d).…”

Section: The Holocene Geomagnetic Intensity Record For the Azoresmentioning

confidence: 99%

“…Here we present both IZZI-Thellier and pseudo-Thellier results for cooling units from periods of known low intensities and report estimates as low as 24 µT. We therefore enlarge the range of intensities on which the calibration relation is based and use these data to update the calibration relation proposed by de Groot et al (2015) to B abs = 7.718 × |pseudo-Thellier slope| + 14.600 (Fig. 6), and provide the associated 95 per cent confidence interval (Fig.…”

Section: Calibrated Pseudo-thellier Experimentsmentioning

confidence: 99%

The multimethod palaeointensity approach applied to volcanics from Terceira: full-vector geomagnetic data for the past 50 kyr

Groot¹,

Pimentel

Chiara

2016

Geophys. J. Int.

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S U M M A R YThe island of Terceira (38.5 • N, 27.2 • W) in the Azores Archipelago boasts a wealth of welldated recent volcanic products; it is therefore the ideal location to improve the resolution of the full-vector geomagnetic field record for the Mid-Atlantic Ocean. We investigated 21 (sub-)sites sampled from 10 different cooling units; six of these cooling units are from the Holocene, the other four are approximately coeval with the age of known geomagnetic excursions. After successfully determining the palaeodirections from all but one site, we applied the multimethod palaeointensity approach to all sites. Here, we used three different palaeointensity methods: the IZZI-Thellier protocol, the Multispecimen technique, and the calibrated pseudo-Thellier method. For the Holocene sites four robust palaeointensity estimates were obtained, they mostly agree with data from the nearby island of São Miguel and data from the Iberian Peninsula and West Africa. Two older sites, dated at 25.7 and 46.3 ka, produced low palaeointensities: 24.4 and 24.1 µT, respectively. As both the IZZI-Thellier and pseudo-Thellier methods yielded technically acceptable results for these sites we used them to improve the pseudo-Thellier calibration relation and establish its applicability to lower palaeointensities. Sixty per cent of all sampled cooling units/ages in our study yielded a technically successful palaeointensity estimate; this unusually high success rate is attributed both to our sampling strategy and the implementation of the multimethod approach.

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High paleointensities for the Canary Islands constrain the Levant geomagnetic high

Cited by 52 publications

References 68 publications

Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxima

Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxima

Large geomagnetic field anomalies revealed in Bronze to Iron Age archeomagnetic data from Tel Megiddo and Tel Hazor, Israel

The multimethod palaeointensity approach applied to volcanics from Terceira: full-vector geomagnetic data for the past 50 kyr

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