Article
Geochemistry & Geophysics
Gillian M. Turner, Ruth M. Corkill
Summary: The southwest Pacific region is under-represented in palaeomagnetic secular variation databases, but reliable data from this region are crucial for constructing global models and master records for dating purposes. The NZPSV11k and NZPSV1k records provide valuable insights into the palaeomagnetic and archaeomagnetic variations in the region. The records show significant differences from global models, highlighting the importance of incorporating data from the region.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2023)
Article
Geochemistry & Geophysics
Nafiz Maden, Burak Yildiz
Summary: This study compiled magnetic declination data from 1500 to the present day in Anatolia and Istanbul, and drew magnetic declination plots and maps. The study also found that the magnetic declination values in Turkey have changed between 1970 and 2009.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2022)
Article
Geochemistry & Geophysics
Ron Shaar, Yves Gallet, Yoav Vaknin, Lilach Gonen, Mario A. S. Martin, Matthew J. Adams, Israel Finkelstein
Summary: Our understanding of the Earth's magnetic field intensity in the past has relied on paleointensity analysis. This study uses radiocarbon-dated archaeological materials from the Levant and Mesopotamia to construct a continuous curve of geomagnetic field intensity spanning 2500 years, providing unprecedented detail and resolution.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Meteorology & Atmospheric Sciences
Yunxiang Song, Kyle B. Lawlor, Thomas A. Witten
Summary: The Earth's annual temperature cycle closely follows the annual cycle of solar flux. A new analysis of historical weather station records from the United States determined persistent annual and semiannual variation with high precision. The semiannual temperature cycles are much stronger than expected, consistent with multiplicative effects of two annual cycles.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2021)
Article
Geosciences, Multidisciplinary
William J. Brown, Ciaran D. Beggan, Grace A. Cox, Susan Macmillan
Summary: The British Geological Survey submitted three candidate models for the 13th generation International Geomagnetic Reference Field, derived from data collected by European Space Agency Swarm satellites and ground observatories between 2013.9 and 2019.7. These models include time dependence for both internal and external fields, with predictions for magnetic field secular variation from 2020 to 2025.
EARTH PLANETS AND SPACE
(2021)
Article
Multidisciplinary Sciences
Shuhui Cai, Rashida Doctor, Lisa Tauxe, Mitch Hendrickson, Quan Hua, Stephanie Leroy, Kaseka Phon
Summary: The study conducted geomagnetic research at the Tonle Bak site in Cambodia, recovering geomagnetic information from the 11th to 14th centuries. It revealed a sharp change in the geomagnetic field between 1200 and 1300 CE, providing evidence for the possible existence of low-latitude flux expulsion. The study suggests a new focus on detailed geomagnetic research in low-latitude areas around the equator and exploration of related dynamic processes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geosciences, Multidisciplinary
Magnus D. Hammer, Grace A. Cox, William J. Brown, Ciaran D. Beggan, Christopher C. Finlay
Summary: The paper presents geomagnetic main field and secular variation time series derived from magnetic field measurements collected by the three Swarm satellites. Two types of Geomagnetic Virtual Observatory (GVO) data products are described, offering a convenient way to monitor and analyze long-term variations of the geomagnetic field globally. The Swarm GVO time series, regularly updated every four months, are well suited for users interested in core dynamics, magnetospheric and ionospheric signals, and data assimilation studies.
EARTH PLANETS AND SPACE
(2021)
Article
Geosciences, Multidisciplinary
E. Thebault, G. Hulot, B. Langlais, P. Vigneron
Summary: The detailed mapping of Earth's magnetic field, using satellite and near-surface measurements, has produced a global model with SH degree 1050 that is in agreement with previous satellite-based models at large wavelengths. The model is stable when downward continued to the Earth's surface and fits the CHAMP and Swarm satellite data down to expected noise levels.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geology
Ruth M. Corkill, Gillian M. Turner
Summary: The paleomagnetic records of three lake sediment cores in northern New Zealand have been merged to produce a new Holocene geomagnetic secular variation record. These records were correlated using tephra and magnetic susceptibility variations, showing well-defined swings in magnetic direction at different time periods. The regional nature of geomagnetic secular variation is indicated by its agreement with records from Mavora Lakes, 1000 km further south.
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
(2022)
Article
Geography, Physical
Venera Dobrica, Cristiana Stefan, Crisan Demetrescu
Summary: This study examined the Earth's surface magnetic field and its secular variation, focusing on the internal constituents and dynamics of the SV foci. By analyzing long time-span geomagnetic models and applying filtering techniques, the study revealed new features of the Earth's surface field evolution, such as the westward drift of the inter-centennial constituent and the westward drift of higher frequency constituents in the equatorial band.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geochemistry & Geophysics
Steve Lund, Gary Acton, Brad Clement, Makoto Okada, Lloyd Keigwin
Summary: The study presents important information on the paleomagnetic field variations during two specific periods based on PSV and excursion data obtained from ODP sites in the western North Atlantic. By correcting age estimates and comparing records, it reveals significant variability of the geomagnetic field at different timescales and characteristics of excursions, providing insights into the behavior of the magnetic field between reversals.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Review
Biochemistry & Molecular Biology
Jacek Lorkowski, Mieczyslaw Pokorski
Summary: This article comprehensively describes the development of medical records from ancient to modern times, reflecting the revolutionary change from paper-based to electronic format. The migration process to eHealth records involves the use of artificial intelligence algorithms, which benefit both patients and providers by improving patient management and communication among medical centers.
Article
Geosciences, Multidisciplinary
Marina Puente-Borque, F. Javier Pavon-Carrasco, Alberto Nunez, Jose Manuel Tordesillas, Saioa A. Campuzano
Summary: The Earth's magnetic field, known as the core field, is primarily generated in the fluid core and plays a dominant role in the geomagnetic field. By utilizing a large amount of geomagnetic data, global and regional core field models can be developed. In this study, a regional model of the core field over the Iberian Peninsula was developed based on data from Swarm satellites, geomagnetic observatories, and repeat stations. Its performance was validated and found to outperform global models, and the results will be used to produce magnetic cartography for Iberia and the Balearic Islands in 2020.
EARTH PLANETS AND SPACE
(2023)
Article
Multidisciplinary Sciences
Sabine Eckhardt, Ignacio Pisso, Nikolaos Evangeliou, Christine Groot Zwaaftink, Andreas Plach, Joseph R. McConnell, Michael Sigl, Meri Ruppel, Christian Zdanowicz, Saehee Lim, Nathan Chellman, Thomas Opel, Hanno Meyer, Jorgen Peder Steffensen, Margit Schwikowski, Andreas Stohl
Summary: Using ice-core data and modeling, historical emissions of black carbon are reconstructed, highlighting discrepancies with existing inventories. This suggests potential biases in climate sensitivity due to incomplete combustion of fossil fuels and biomass. Accurate knowledge of past emissions is crucial for quantifying and modeling global climate forcing.
NATURE COMMUNICATIONS
(2023)
Article
Geography, Physical
Steve Lund, Ellen Platzman, Chris Scholz
Summary: A paleomagnetic study was conducted on three piston cores from Lake Turkana to recover a Holocene paleomagnetic secular variation (PSV) record and correlate it with other PSV records from the East Africa Rift Valley. Magnetic measurements were made on the cores, and the resulting records could be correlated. The sediment ages were estimated through PSV age estimation and radiocarbon dating, and showed good consistency. The Lake Turkana PSV record is the highest resolution directional record of PSV ever recovered from Africa.
Article
Environmental Sciences
Clemens Reimann, Karl Fabian, Belinda Flem
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Environmental Sciences
Clemens Reimann, Karl Fabian, Belinda Flem, Peter Englmaier
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Geochemistry & Geophysics
Elisabeth Schnepp, Daniele Thallner, Patrick Arneitz, Hermann Mauritsch, Robert Scholger, Christian Rolf, Roman Leonhardt
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Geochemistry & Geophysics
G. W. ter Maat, K. Fabian, N. S. Church, S. A. McEnroe
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Geochemistry & Geophysics
Karl Fabian, Valera P. Shcherbakov
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Geochemistry & Geophysics
Even S. Nikolaisen, Richard J. Harrison, Karl Fabian, Suzanne A. McEnroe
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Geochemistry & Geophysics
Elisabeth Schnepp, Daniele Thallner, Patrick Arneitz, Roman Leonhardt
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2020)
Article
Geochemistry & Geophysics
David Cortes-Ortuno, Karl Fabian, Lennart V. de Groot
Summary: Micromagnetic tomography aims to reconstruct individual magnetizations of magnetic particles by combining high-resolution magnetic scanning techniques with micro X-ray computed tomography. A mathematical procedure is described to recover higher orders of the magnetic potential of individual magnetic particles, allowing for detailed rock magnetic studies on large ensembles of particles. This approach provides valuable information about the stability and reliability of the particles as paleomagnetic remanence carriers.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Peter Robinson, S. A. McEnroe, R. J. Harrison, K. Fabian, F. Heidelbach, M. Jackson
Summary: Lamellar magnetism in natural rocks is a unique source of remanent magnetization, distinct from common bulk magnetic moments in ferrimagnetic minerals. This type of magnetism has been identified as a cause for magnetic anomalies with high Koenigsberger ratio. The study explores the physical origins and interactions of lamellar magnetism, highlighting the effects of lamellar shapes on magnetic coupling and the acquisition of magnetization in ilmenite lamellae. Simplified models are developed to assess and explain these observations in relation to exchange bias and lattice-preferred orientation.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
Stephanie Scheidt, Ramon Egli, Matthias Lenz, Christian Rolf, Karl Fabian, Martin Melles
Summary: The Levinson-Lessing Lake in northern Central Siberia is characterized by continuous sedimen-tation at high rates for over 32,000 years. The study found that the lake's sediments are suitable for paleomagnetic analyses, with magnetic properties indicating remanence carriers originating likely from magnetotactic bacteria. The research provides important insights into the magnetic mineralogy of the lake sediments, demonstrating the presence of detrital origin remanence carriers.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Annemarieke Beguin, Karl Fabian
Summary: The study reveals that stress anisotropy vanishes with increasing temperature in magnetite, and a new measurement and evaluation method can effectively separate stress-induced anisotropy and demagnetization effects, providing a new approach to studying the reliability of remanent magnetization in rocks.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Elisabeth Schnepp, Patrick Arneitz, Morgan Ganerod, Robert Scholger, Ingomar Fritz, Ramon Egli, Roman Leonhardt
Summary: Paleomagnetic investigation of Pliocene volcanic rocks in southeast Austria revealed anomalous magnetic directions that cannot be explained by local or regional tectonic movements. Virtual geomagnetic pole positions were all located in the southern hemisphere, with some close to the geographic pole and others concentrated in a narrow longitude sector offshore South America. The study supports the hypothesis of a transitional geomagnetic field configuration during the volcanic activity of these regions.
EARTH PLANETS AND SPACE
(2021)
Article
Geochemistry & Geophysics
P. Arneitz, R. Leonhardt, R. Egli, K. Fabian
Summary: A new iterative Bayesian spherical harmonic model is developed to better constrain the geomagnetic field evolution over the historical epoch from 1400 to 1900 CE. The model incorporates both direct historical and indirect archeomagnetic or volcanic records, effectively dealing with the variable data uncertainties. The resulting geomagnetic field reconstruction shows a decrease in the axial dipole component between 1500 and 1600 CE, followed by a relatively stable period until 1900 CE, aligning well with historical records and providing insights into the evolution of the South Atlantic Anomaly.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Lennart Groot, Karl Fabian, Annemarieke Beguin, Martha E. Kosters, David Cortes-Ortuno, Roger R. Fu, Chloe M. L. Jansen, Richard J. Harrison, Tristan Leeuwen, Auke Barnhoorn
Summary: The combination of X-ray computed tomography and magnetic surface scanning measurements allows for the determination of magnetizations of individual grains in a sample. The new Micromagnetic Tomography (MMT) technique opens up new avenues for paleomagnetic and rock-magnetic research by systematically analyzing how geological materials record and retain information on the past state of the Earth's magnetic field in a nondestructive way. MMT has the potential to unlock paleomagnetic information from even the most complex, crucial, or valuable recorders that current methods are unable to recover by interpreting only the contributions of known magnetically well-behaved grains in a sample.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)